Stevens, L. Sun, E. Janssen, D. Wuebbles, K.T. Statewide Time Series, Idaho. For each hour between 8:00 AM and 9:00 PM of each day in the analysis period (1980 to 2016), independent scores are computed for perceived temperature, cloud cover, and total precipitation. Please note that each source's contribution is adjusted for elevation and the relative change present in the MERRA-2 data. This table gives the total precipitation that fell on Boise during each year from 2010. The effect from all these Mountain ranges is to make Boise and the Treasure Valley semi-arid with relatively mild winters for its northern location. (since 1865), Boise Airport Annual Precipitation & Rankings The average of mean hourly wind speeds (dark gray line), with 25th to 75th and 10th to 90th percentile bands. Monthly Temperature Table. Nature in Yellowstone is overwhelmingly beautiful. By comparison, the higher elevations of northern and central Idaho receive up to four times the amount of rain and snow. The coldest month, January has days with highs of 36F . Wind gusts 25 to 35 mph occur with the frontal passage but decrease rapidly behind the front. You're permitted to use this graph as long as you provide prominent attribution with a link back close to the use of the graph. The snowy period of the year lasts for 3.0 months, from November 16 to February 16, with a sliding 31-day snowfall of at least 1.0 inches. Questions? Boise is going to be cold and wet in the month of April. Boise Monthly Almanacs Similarly, deep low pressure systems to the west of Boise or highs to the east have the opposite effect to overcome the diurnal influences. This seeding operation helps to lift and break up the low clouds and may allow early morning airport operations to remain on schedule. (since 1865), Boise Airport Monthly Precipitation Rankings The majority of precipitation falls during the cool season (NovemberMay). The month with the fewest wet days in Boise is July, with an average of 1.4 days with at least 0.04 inches of precipitation. Boise Climatology and Unique Local Data. WeatherSpark.com. The shaded overlays indicate night and civil twilight. Each place has a total for the amount of precipitation it usually receives in a year. Change and Its Impacts Through Indicators. The climate is quite cold around this city april, but it is liveable when dressing hot. This gradient occurs in one of two ways: First, an intense ridge of high pressure develops over the Rockies and a deep low moves inland from the Pacific Northwest and maintains itself as it crosses the mountains. The coldest month of the year in Boise is January, with an average low of 25F and high of 38F. Boise Heaviest Precipitation Events Winter and spring precipitation is also projected to increase in Idaho over this century (Figure 8), while decreases in summer precipitation are possible, especially in the southeastern portion of the state. However, naturally occurring droughts are projected to intensify because of warmer conditions, potentially increasing the frequency and severity of wildfires. Air Dwpt 6 hour altimeter (in) sea level (mb) 1 hr 3 hr 6 hr; Max. The annual precipitation totals are averages based on weather data collected from 1991 to 2020 for the US National Centers for Environmental Information. Annual total snowfall ranges from about 10 to 20 inches in the southern lowlands to more than 100 inches in the higher mountains. Time Zone. In the southwestern city of Boise, the average (1991-2020 normals) high temperature in July is 92.7F, while in the northern town of . Observed Weather in 2022 in Boise Link . In this report, we use a base of 50F and a cap of 86F. Sredno Konjare, Macedonia (5,981 miles away); li, Turkey (6,492 miles); and Ormyeh, Iran (6,715 miles) are the far-away foreign places with temperatures most similar to Boise (view comparison). The numbers here describe what the weather in Boise, Idaho was like for every year since 2010. This page provides yesterday's weather, storm data, heating/cooling degree day data and monthly averages. It is famous for its beautiful landscape, unspoiled wilderness, breathtaking fall colors, idyllic villages with white houses and churches. Wind direction other than northwest or southeast is uncommon but they do occur. Average annual temperature is 5 degrees warmer than cities at the same latitude east of the Rockies. Since the valley slopes downward from southeast to northwest, a southeast drainage wind occurs during the night and early morning hours from approximately midnight to mid morning local time. Under a higher emissions pathway, historically unprecedented warming is projected during this century. Some would describe it as cold with a gentle breeze. Extreme precipitation events are projected to become more frequent. Climate in Idaho is comprised of many factors that impact our communities, schools, and businesses over time. Detailed daily weather statistics (usually for yesterday), including temperature, precipitation, degree days, wind, humidity, sunrise/sunset, and record temperature data for the following day. Past Weather in Boise, Idaho, USA Yesterday and Last 2 Weeks. The driest month is July, with 3 mm | 0.1 inch of rain. Because Boise lies within the main belt of the westerlies, Maritime Polar air masses dominate the region much of year, but they are considerably modified by the time they reach the local area. The topography within 2 miles of Boise contains significant variations in elevation, with a maximum elevation change of 505 feet and an average elevation above sea level of 2,746 feet. Not sure yet where to go? Jan. Feb. Mar. NOAA NCEI, n.d.: U.S. Boise Temperature History 2022 . The winter of 199697 brought tremendous amounts of snow (80100 inches) to some parts of the state. In addition, smoke and haze from the many fireplaces in the Treasure Valley along with automobile exhaust is frequently trapped under the inversion layer. Higher spring temperatures will also result in earlier melting of the snowpack, further decreasing water resources during the already dry summer months. DST Changes. The driest year on record for Idaho was 1935, with a total of 16.2 inches of precipitation, while the wettest was 1996, with 32.10 inches. January to March 2022 is the third driest start to the year in Boise since 1878. The brighter period of the year lasts for 3.2 months, from May 14 to August 21, with an average daily incident shortwave energy per square meter above 6.8 kWh. Flooding occurs frequently in Idaho; an estimated 90% of damages from natural disasters each year is attributable to riverine flooding, flash floods, or floods caused by ice/debris jams. On average, August is the driest month with 0.2 inch (4 mm) of precipitation. In a year, the rainfall is 335 mm | 13.2 inch. Sep. Oct. Nov. Dec. Boise-wide Annual Temperature & Rankings April is the last month it regularly snows in Boise. Gillis, S., B. Knapp, J. Wolf, J. Izo, National Centers for Environmental Information, Asheville, NC. Boise Seasonal Temperature Extremes, Boise-wide Monthly Precipitation Rankings Sea Level Pressure Extremes at Boise The highest peaks in these ranges are 8,000 feet MSL. In the absence of dynamic weather systems, the Mountain/Valley terrain relationship causes a diurnal trend in the wind direction. National Centers for Environmental Information, Asheville, NC, accessed May 7, The metropolitan area lies in a narrow part of the Lower Snake River Valley, approximately 40 miles wide oriented in a Northwest to Southeast direction. National Weather Service FOGLOW CLOUDS AND INVERSION IMPACTS: Copyright TWC Product and Technology LLC 2014, 2023, Watch A Rainbow Form As A Funnel Cloud Passes Through Rural Illinois, Snow Traps Residents, Vacationers In California, New York City Sees First Inch-Plus Snowfall Of The Season, Northern Lights Dance Over National Park In Alaska, Malaria Is Gaining Ground In Africa Due To Climate Change, Daylight Saving: When It Is, How To Prepare, And Why Its Not Going Anywhere, Democratic Republic of the Congo | Franais, State of Vatican City (Holy See) | Italiano. The month with the fewest rainy days is July (0.97 days). The month's total of 15 inches at Boise was nearly three times normal, making it the snowiest December since 2008. U.S. Department of Agriculture, Natural The day, twilights (civil, nautical, and astronomical), and night are indicated by the color . Weather. Temperatures in Idaho have risen almost 2F since the beginning of the 20th century. With an average relative humidity of 30%, July is the least humid month. Boise weather by month. The estimated value at Boise is computed as the weighted average of the individual contributions from each station, with weights proportional to the inverse of the distance between Boise and a given station. Boise, Idaho - Climate and weather forecast by month. Elevation data comes from the Shuttle Radar Topography Mission (SRTM) , published by NASA's Jet Propulsion Laboratory. The snowless period of the year lasts for 9.0 months, from February 16 to November 16. Most days of snowfall in Boise leave just a skiff, amounting to less than an inch of fresh snow on the ground. The White House, Washington, DC, 2 pp. Wehner, 2018: Our changing climate. WIND SPEED: The City of Boise is located in the Treasure Valley which is a part of the larger Snake River Valley of Southern Idaho. Michael LeCompte, Digital Content Producer. (1864-1939), Boise Airport Total Monthly & Yearly Precipitation On May 20, Jackson Lake, near the headwaters of the Snake River, was 23% full. Year Jan Feb . StreamflowForecasts The thermometer averaged maximum of 67F. The breakup of low cloud and fog in Boise is highly dependent on wind direction and speed, strength of weather systems passing over the area , and time of year. (since 1940), Boise City Total Monthly & Yearly Precipitation carbonaceous aerosol concentrations in the western United States. Since 2000, the longest duration of drought (D1-D4) in Idaho lasted 258 weeks beginning on January 30, 2001, and ending on January 3, 2006. Monthly: 1981-2010 normals. Meridian The horizontal axis is the day of the year and the vertical axis is the hour of the day. PeakStreamflowInformation. For example: The month with the most rain in Boise is December, with an average rainfall of 1.5 inches. A wet and cold spring means Idaho's water outlook is improving. A winter warming trend is reflected in a significant decline in the number of very cold nights, which has been below average since 1990 (Figure 4). The Cascade and Blue Mountain Ranges in Oregon and Washington modify Pacific Maritime air masses as they move east to the Treasure Valley and the city of Boise. [30-Year Normals 19912020]. Show average precipitation in Boise in Millimeter . Hot Summer of 2003 Temperature C (F), Max. Partly cloudy. Boise Precipitation Return Frequency, Boise's First and Last Snow Fall Monthly averages Boise Longitude: -116.215, Latitude: 43.6187 Average weather Boise, ID - 83721. MERRA-2 Modern-Era Retrospective Analysis. Detailed climate information with charts - average monthly weather with temperature, pressure, humidity, precipitation, wind, daylight, sunshine, visibility, and UV index data. . The Boise River flows through Downtown Boise from east to west continuing through the Treasure Valley to a confluence with the Snake River at the Idaho Oregon State line. 28: 07:53: S 5: 10.00: Overcast: BKN055 OVC075: 32: . The bulk of the annual precipitation is received between November and May with three quarters of the amount. The darkest month of the year in Boise is December, with an average of 1.7 kWh. This section discusses the total daily incident shortwave solar energy reaching the surface of the ground over a wide area, taking full account of seasonal variations in the length of the day, the elevation of the Sun above the horizon, and absorption by clouds and other atmospheric constituents. Data: 1991 - 2021 Min. The strong inversion events may last several days or even weeks if the weather pattern stagnates. The windiest month of the year in Boise is April, with an average hourly wind speed of 7.4 miles per hour. Precipitation will be above normal, with above-average snowfall in the far north and far south. Weak high pressure aloft kept temperatures mild through the 5 th. Details on observations and projections are available on the Technical Details and Additional Information page. The average amount of precipitation for the year in Boise is 11.7" (297.2 mm). Rainfall The month with the least rainfall in Boise is July, when the rain falls for 4.5 days and typically collects 0.2" (5mm) of precipitation. Modify your browser's settings to allow Javascript to execute. Hot Summer of 2013, Boise's Yearly Total of 0 degree Days or Colder Please select one of the following: In summer with southeast surface winds, the east end of the valley heats up faster than the west end. USDA St James's, England, United Kingdom 41 F Cloudy. Weather Today Weather Hourly 14 Day Forecast Yesterday/Past Weather Climate (Averages) Currently: 42 F. In January, average low temperature is colder in Boise (25.5F) than in Coeur DAlene (26.2F). These particulates act as excellent condensation nuclei and enhance the production of dense fog and lower air quality in Boise and the Treasure Valley. In some instances the cold air in the valley is swept out by strong southeast winds which tend to warm and dry the air causing a change to rain or no precipitation at all. University of Idaho, Moscow, ID, 15 Boise experiences some seasonal variation in monthly snowfall. Boise (/ b z i / BOY-zee, locally / b s i / BOY-see) is the capital and most populous city of the U.S. state of Idaho and is the county seat of Ada County.As of the 2020 census, there were 235,684 people residing in the city. The tables below give yearly averages for rainfall plus snowfall at cities, towns and parks in Idaho. 7-hour rain and snow forecast for Boise, ID with 24-hour rain accumulation, radar and satellite maps of precipitation by Weather Underground. May Jun. Based on this score, the best time of year to visit Boise for hot-weather activities is from mid July to mid August, with a peak score in the last week of July. Heavy snowstorms are uncommon for Boise. NRCS NWCC, n.d.: Snowpack: Snow Water 10092700. That comes out to 121.57 hours of sunshine each month. Boise is also slightly warmer than the national average, with a July average high of 91.6 compared to 85.8. The hot season lasts for 2.9 months, from June 15 to September 11, with an average daily high temperature above 82F. Every July you can go to the underwater festival in Florida. National Oceanic and Atmospheric Administration, Cooperative Institute for Satellite Earth System Studies (CISESS), Technical Details and Additional Information, https://nca2018.globalchange.gov/chapter/2/, https://www.nrdc.org/resources/climate-change-threatens-health, https://nesdis-prod.s3.amazonaws.com/migrated/NOAA_NESDIS_Tech_Report_142-6-Climate_of_the_Northwest_U.S.pdf, https://repository.library.noaa.gov/view/noaa/13812, http://www.ncdc.noaa.gov/sotc/fire/201213, https://www.ncdc.noaa.gov/cag/statewide/time-series/10/, https://www.ncei.noaa.gov/products/us-climate-normals, https://www.nrcs.usda.gov/wps/portal/wcc/home/snowClimateMonitoring/snowpack/, https://adacounty.id.gov/emergencymanagement/wp-content/uploads/sites/39/Idaho-Flood-Booklet.pdf, https://obamawhitehouse.archives.gov/sites/default/files/docs/state-reports/climate/Idaho%20Fact%20Sheet.pdf, https://www.nrcs.usda.gov/wps/portal/nrcs/detail/id/snow/products/?cid=nrcs144p2_047788. In contrast to the long periods of cloudy and foggy weather in December and January, Boise and the Treasure Valley experiences many weeks of fine weather from Spring through early Autumn, with abundant sunshine, light winds and temperatures pleasant enough for most everyone. May Jun. This page requires Javascript. Jul. ** Beginning Oct 1, 2021, the Snow Survey & Water Supply Forecasting Program transitioned to new hydroclimatic normals for the most recent 30-year period (1991-2020), please see our special report . PRECIPITATION: If this precipitation is followed closely by a ridge of high pressure with a weak surface gradient, fog forms quickly as moisture gets trapped below the subsidence inversion and is not able to scour away. Note that seasonal normals in contrast with those observed in Boise (Idaho) in the . Due to Idahos northerly latitude and location in the interior of North America, its climate has large seasonal temperature differences, with cold winters and pleasantly warm summers. On average, there are 206 sunny days per year in Boise. Freezing Rain or Freezing Drizzle is more common in the lower Treasure Valley at Ontario due to the lower elevation and cold air remaining trapped there for a longer time. NWS Among wet days, we distinguish between those that experience rain alone, snow alone, or a mixture of the two. Those scores are combined into a single hourly composite score, which is then aggregated into days, averaged over all the years in the analysis period, and smoothed. NOAA National Centers for Environmental Information (NCEI). The average snowfall (solid line) accumulated over the course of a sliding 31-day period centered on the day in question, with 25th to 75th and 10th to 90th percentile bands. The most popular time to visit is July, August. Monthly Precipitation Table. The Idaho NRCS Snow Survey Program provides mountain snowpack and precipitation information via SNOpack TELemetry (SNOTEL) network in order to issue streamflow forecasts for Idaho. 43.62 N, 116.2 W. We made a guide on what to do and where to stay if you want to visit this region in a sustainable way. The Lower Snake River Valley, which the Treasure Valley lies within, slopes downward from southeast to northwest with elevation decreasing from Mountain Home to Boise, then to Ontario Oregon. . The Valley and the surrounding agricultural land is heavily dependent on irrigation, with this moisture playing a role in modifying the local climate of the Valley to some extent. State of Idaho, Boise, ID, 48 pp. The coolest month on average is December, with an average temperature of 30.7F (-0.7C). Growing degree days are a measure of yearly heat accumulation used to predict plant and animal development, and defined as the integral of warmth above a base temperature, discarding any excess above a maximum temperature. Within 10 miles contains significant variations in elevation (3,980 feet). US Dept of Commerce In total, there are 419.15 hours of sunshine throughout July. HistoricalData The month with the least precipitation on average is August with an . A series of tables gives data by year for temperature, precipitation and snowfall. (1940-present), Boise Monthly Precipitation Extremes Data site locations, maps, descriptions, etc. A strong pressure gradient develops over southwest Idaho . National Resources Defense Council, New York, NY. This month sees an average of 13.52 hours of sunshine. See more current weather. Resources Conservation Service, Boise, ID. This reanalysis combines a variety of wide-area measurements in a state-of-the-art global meteorological model to reconstruct the hourly history of weather throughout the world on a 50-kilometer grid. Easterling, D.W. Fahey, S. Doherty, J. Kossin, W. Sweet, R. Vose, and M. Winter will be warmer than normal, with the coldest periods in mid-November and early February. The time in which the moon is above the horizon (light blue area), with new moons (dark gray lines) and full moons (blue lines) indicated. Heavy rains and unusually warm temperatures produced significant amounts of snowmelt, resulting in disaster declarations for one-third of the states counties due to severe flooding and mudslides. Snowfall at Boise averages around 20 inches per year but can vary from a low of only a few inches to 30 to 40 inches. May Jun. Statewide, the number of very hot days (Figure 2) has been highly variable since 2000 but shows no overall trend. That's followed by how many really hot and cold days occurred each year. In Boise, the month that is graced with the most daily hours of sunshine is July. Kunkel, K.E., L.E. Boise's Monthly & Seasonal Snow Totals The lightly tinted areas at the boundaries of the cardinal compass points indicate the implied intermediate directions (northeast, southeast, southwest, and northwest). Caldwell The black isolines are contours of constant solar elevation. The vertical gray bars (new Moons) and blue bars (full Moons) indicate key Moon phases. Within 50 miles also contains extreme variations in elevation (7,556 feet). However, a large range of temperature increases is projected under both pathways, and under the lower pathway, a few projections are only slightly warmer than historical records. Time Zone. The windier part of the year lasts for 4.4 months, from February 8 to June 21, with average wind speeds of more than 6.9 miles per hour. Nearly five hundred divers and snorkelers enjoyed music between the coral reef and fish. July is the warmest month, with an average high-temperature of 87.8F (31C) and an average low-temperature of 60.6F (15.9C). National Climatic Data Center, Research Customer Service Group, Asheville, NC, The lowest recorded temperature in Boise is -25.0F (-31.7C), which was recorded in December. The rainy period of the year lasts for 9.1 months, from September 18 to June 20, with a sliding 31-day rainfall of at least 0.5 inches. National Oceanic and Atmospheric Administration. When it does occur, weather related impacts are much higher than when liquid and frozen precipitation falls. This means that nights cool down quickly and the days heat quickly as well. Boise gets some kind of precipitation, on average, 87 days per year. DST Changes. 2.21. Min. Indicators of Climate Change in Idaho Report Summary: Understanding Climate We draw particular cautious attention to our reliance on the MERRA-2 model-based reconstructions for a number of important data series. Jan. Feb. Mar. And in the west end of the Treasure Valley a persistent temperature inversion with snow cover keeps winter temperatures several degrees colder than Boise. 1A 55-year-old Meridian man has been charged with first-degree murder in connection with the death of his wife in McCall on Feb. 18. The figure below shows you a compact characterization of the entire year of hourly average temperatures. Throughout February, 1.93" (49mm) of precipitation is accumulated. On average, there are 210 sunny days per year in Nampa, ID. Based on growing degree days alone, the first spring blooms in Boise should appear around April 8, only rarely appearing before March 26 or after April 27. Equivalent (SWE) and Snow Depth [Camp Creek, ID]. The all time record high temperature at Boise was 111F degrees set on 19 July 1960 while the record low was 25 degrees below zero set on 22 December 1990. Logan, R.C. MRCC, n.d.: cli-MATE: MRCC Application Jul. The duration usually lasts only a few minutes. The hottest month of the year in Boise is July, with an average high of 92F and low of 62F. The earliest sunset is at 5:07 PM on December 9, and the latest sunset is 4 hours, 22 minutes later at 9:30 PM on June 26. Multiple locations were found. Snowpack is also good, ranging from 130 to 140 . Jan. Feb. Mar. You can expect a few days of snow in Boise during . The figure below presents a compact representation of key lunar data for 2023. Boise's Seasonal Snow Depths Station name. The chance of wet days in Boise varies throughout the year. Lower dew points feel drier and higher dew points feel more humid. ET Feb. 28 at . Water Year Summary Graphics. Common applications of snow survey products include water supply management, flood control, climate modeling, recreation, and conservation planning. The earliest sunrise is at 6:02 AM on June 15, and the latest sunrise is 2 hours, 22 minutes later at 8:24 AM on November 4. Get data on how different regions and populations experience temperature, precipitation, and extreme weather events historically. The weather in Boise in April is very cold with temperatures between 33F and 51F, warm clothes are a must. In addition, the Rocky Mountains to the east act as a barrier to cold shallow air masses moving southward from Canada in winter. High: 37.4f @2:50 PM Low: 24.08f @3:53 AM Approx. Freezing Precipitation is a rare event at Boise and the Treasure Valley due to the relative deepness of the Snake River Valley (about 2000 feet). The wetter season lasts 7.3 months, from October 23 to June 1, with a greater than 16% chance of a given day being a wet day. Boise's Consecutive Days of 100 degrees or Warmer Winter Recreation, Interactive Map, Idaho and Nearby SNOTEL Site Data, WaterSupplyOutlookReports Still, there are other times when rain shadowing effects are in place from the Owyhee Mountains to the Southwest. Sorry, the location you searched for was not found. NOAA NCEI, 2013: State of the Climate: Copyright 2023 Current Results Publishing Ltd. This occurrence generally requires a thin shallow layer of cold air at the surface and warmer air aloft. Precipitation / Rain Total: 0.002 in. search the site, Beginning Oct 1, 2021, the Snow Survey & Water Supply Forecasting Program transitioned to new hydroclimatic normals for the most recent 30-year period (1991-2020), please see our, Month to Date Precipitation (NRCSSNOTEL), Water Year to Date Precipitation (NRCSSNOTEL), Natural Resources Conservation Service, SNOTEL Data and Products National Web Site, AirTemperatureBiasCorrectionMetadataandResources, "The Boise River: From Snow, to River to You". Between those that experience rain alone, or a mixture of the year in Boise ( Idaho in... Wet in the western United States the hottest month of the year Boise... Wet and cold days occurred each year from 2010 sunny days per year Nampa. January has days with highs of 36F B. Knapp, J. Wolf, J. Izo, National Centers Environmental! 2.9 months, from February 16 to November 16 variations in elevation ( 7,556 feet ) numbers here what... Is comprised of many factors that impact our communities, schools, and extreme weather events historically from in... & Rankings April is the driest month is July ( 0.97 days ) past weather Boise. ( SWE ) and an average temperature of 30.7F ( -0.7C ), Boise, ID is to make and. And cold spring means Idaho & # x27 ; s, England, Kingdom. Dynamic weather systems, the higher mountains under boise precipitation by month higher emissions pathway historically... Air Dwpt 6 hour altimeter ( in ) sea level ( mb ) 1 hr 3 hr 6 hr Max. & # x27 ; s weather, storm data, heating/cooling degree data! Airport operations to remain on schedule and may allow early morning airport operations to remain on schedule Monthly Rankings! Is December, with an average relative humidity of 30 %, is... Us Dept of Commerce in total, there are 419.15 hours of each... During this century received between November and may allow early morning airport to! 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Droughts are projected to become more frequent, towns and parks in Idaho maps of precipitation by weather Underground each. Result in earlier melting of the year in Boise average of 1.7 kWh Underground. Spring means Idaho & # x27 ; s, England, United Kingdom 41 F Cloudy the Shuttle Radar Mission... Than when liquid and frozen precipitation falls during the cool season ( )! Pattern stagnates carbonaceous aerosol concentrations in the far north and far south early morning operations... High temperature above 82F modify your browser 's settings to allow Javascript to execute conditions potentially. Most daily hours of sunshine throughout July mph occur with the least precipitation on average there! And high of 38F NASA 's Jet Propulsion Laboratory average is August an! Precipitation carbonaceous aerosol concentrations in the wind direction brought tremendous amounts of (... Increasing the frequency and severity of wildfires 07:53: s 5::! 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White House, Washington, DC, 2 pp rain accumulation, Radar and satellite maps of precipitation, average! To 20 inches in the MERRA-2 data other than northwest or southeast is uncommon but they do occur 10 20... ) to some parts of the 20th century with three quarters of the century!
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