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==Geography== [[U.S. Route 87 in Montana|U.S. Highway 87]] intersects with [[U.S. Route 191 in Montana|U.S. Route 191]] in town. According to the [[United States Census Bureau]], the city has a total area of {{convert|5.32|sqmi|sqkm|2}}, all land.<ref name="Gazetteer files">{{cite web|title=US Gazetteer files 2010 |url=https://www.census.gov/geo/www/gazetteer/files/Gaz_places_national.txt |publisher=[[United States Census Bureau]] |access-date=2012-12-18 |url-status=dead |archive-url=https://web.archive.org/web/20120112090031/http://www.census.gov/geo/www/gazetteer/files/Gaz_places_national.txt |archive-date=January 12, 2012 }}</ref> The city is located in the exact center of the state of Montana and is part of the Rocky Mountains. The city's water source is [[Big Spring Creek (Montana)|Big Spring Creek]], which originates in the foothills of the [[Big Snowy Mountains]] {{convert|6|mi|km}} south of Lewistown. ===Climate=== Lewistown experiences a relatively dry [[humid continental climate]] ([[Kรถppen climate classification|Kรถppen]] ''Dfb'') with long, dry and usually cold winters and short, warm, wetter summers.<ref>[http://www.weatherbase.com/weather/weather.php3?s=80737&cityname=Lewistown-Montana Climate Summary for Lewistown, Montana]</ref> Winter weather can either be severe due to the movement of cold polar air from Canada, or occasionally very mild or even warm due to gusty [[chinook wind]]s. On average 9.3 afternoons will reach {{convert|50|F|C}} during the three winter months, but on the other hand, 46.6 afternoons during a full year will fail to top freezing, {{convert|0|F|C|1}} is reached on 21.5 mornings and {{convert|−25|F|C|1}} on two mornings each winter, with as many as twelve this cold during the severe winter of 1928โ29. Temperatures do not consistently stay above freezing until June: the average window for freezing temperatures is from September 19 to May 23 โ allowing a "growing season" of 92 days โ and for subfreezing maxima from October 26 to April 2. The hottest temperature at Lewistown has been {{convert|105|F|C|1}} on June 21, 1900 and July 31, 1900, and the coldest {{convert|−46|F|C|1}} on 28 January 1929. The hottest minimum has been {{convert|71|F|C|1}} on July 17, 1925, and the coldest maximum {{convert|−28|F|C|1}} on January 29, 1916; the coldest month was January 1950 which averaged {{convert|−1.8|F|C|1}}. During the summer, days are very warm, but nights remain cool and rare freezes have occurred. Most precipitation is from spring thunderstorms: the wettest calendar year has been 1953 with {{convert|28.61|in|mm|1}} and the driest 2021 with {{convert|10.91|in|mm|1}}. Despite the dry conditions, winter snowfall is substantial with an average of {{convert|63.1|in|m|2}}; however the frequent chinooks keep mean snow cover down to {{convert|9|in|m|2}} in January. The most snow on the ground has been {{convert|33|in|m|2}} on February 1 and 2, 1978. February 1978 also had the highest mean snow cover at {{convert|27.1|in|m|2|disp=or}}; the snowiest year has been 1955 with {{convert|172.5|in|m|2}} and the least snowy was 1992 with only {{convert|30.2|in|m|2}}, and the most snow in a month {{convert|41.0|in|m|2}} during March 1954. {{Weather box |location = Lewistown, Montana ([[Lewistown Municipal Airport]]), 1991โ2020 normals, extremes 1896โpresent |single line = Yes |collapsed = yes |Jan record high F = 73 |Feb record high F = 70 |Mar record high F = 88 |Apr record high F = 89 |May record high F = 98 |Jun record high F = 105 |Jul record high F = 105 |Aug record high F = 103 |Sep record high F = 100 |Oct record high F = 92 |Nov record high F = 81 |Dec record high F = 74 |year record high F = |Jan avg record high F = 54.4 |Feb avg record high F = 54.3 |Mar avg record high F = 64.2 |Apr avg record high F = 74.8 |May avg record high F = 80.4 |Jun avg record high F = 87.6 |Jul avg record high F = 94.1 |Aug avg record high F = 94.5 |Sep avg record high F = 90.0 |Oct avg record high F = 79.5 |Nov avg record high F = 65.9 |Dec avg record high F = 53.9 |year avg record high F = 96.5 |Jan high F = 34.4 |Feb high F = 35.3 |Mar high F = 44.3 |Apr high F = 53.0 |May high F = 62.6 |Jun high F = 71.0 |Jul high F = 81.6 |Aug high F = 81.1 |Sep high F = 70.4 |Oct high F = 56.0 |Nov high F = 43.4 |Dec high F = 35.0 |year high F = |Jan mean F = 23.7 |Feb mean F = 24.6 |Mar mean F = 32.9 |Apr mean F = 40.9 |May mean F = 50.0 |Jun mean F = 58.0 |Jul mean F = 66.1 |Aug mean F = 65.4 |Sep mean F = 55.9 |Oct mean F = 43.4 |Nov mean F = 32.1 |Dec mean F = 24.3 |year mean F = |Jan low F = 12.9 |Feb low F = 13.9 |Mar low F = 21.4 |Apr low F = 28.8 |May low F = 37.4 |Jun low F = 45.1 |Jul low F = 50.7 |Aug low F = 49.6 |Sep low F = 41.5 |Oct low F = 30.8 |Nov low F = 20.9 |Dec low F = 13.6 |year low F = |Jan avg record low F = -14.6 |Feb avg record low F = -9.6 |Mar avg record low F = -1.2 |Apr avg record low F = 12.9 |May avg record low F = 24.5 |Jun avg record low F = 34.2 |Jul avg record low F = 41.3 |Aug avg record low F = 39.0 |Sep avg record low F = 28.6 |Oct avg record low F = 12.5 |Nov avg record low F = -2.8 |Dec avg record low F = -11.2 |year avg record low F = -23.1 |Jan record low F = โ46 |Feb record low F = โ42 |Mar record low F = โ34 |Apr record low F = โ17 |May record low F = 11 |Jun record low F = 23 |Jul record low F = 27 |Aug record low F = 27 |Sep record low F = 6 |Oct record low F = โ10 |Nov record low F = โ30 |Dec record low F = โ42 |year record low F= |precipitation colour = green |Jan precipitation inch = 0.58 |Feb precipitation inch = 0.49 |Mar precipitation inch = 0.87 |Apr precipitation inch = 1.71 |May precipitation inch = 2.88 |Jun precipitation inch = 3.35 |Jul precipitation inch = 1.76 |Aug precipitation inch = 1.69 |Sep precipitation inch = 1.39 |Oct precipitation inch = 1.27 |Nov precipitation inch = 0.67 |Dec precipitation inch = 0.51 |year precipitation inch = |Jan snow inch = 9.6 |Feb snow inch = 5.1 |Mar snow inch = 12.0 |Apr snow inch = 8.0 |May snow inch = 4.8 |Jun snow inch = 0.1 |Jul snow inch = 0.0 |Aug snow inch = 0.0 |Sep snow inch = 1.6 |Oct snow inch = 3.9 |Nov snow inch = 7.5 |Dec snow inch = 10.5 |year snow inch = |unit precipitation days = 0.01 in |Jan precipitation days = 7.7 |Feb precipitation days = 8.2 |Mar precipitation days = 9.1 |Apr precipitation days = 11.7 |May precipitation days = 13.7 |Jun precipitation days = 13.6 |Jul precipitation days = 10.3 |Aug precipitation days = 9.0 |Sep precipitation days = 8.5 |Oct precipitation days = 9.4 |Nov precipitation days = 7.4 |Dec precipitation days = 7.3 |unit snow days = 0.1 in |Jan snow days = 7.9 |Feb snow days = 6.3 |Mar snow days = 8.4 |Apr snow days = 5.7 |May snow days = 2.0 |Jun snow days = 0.1 |Jul snow days = 0.0 |Aug snow days = 0.0 |Sep snow days = 1.2 |Oct snow days = 3.2 |Nov snow days = 6.2 |Dec snow days = 8.6 |source 1 = NOAA (average snow/snow days 1981โ2010)<ref name = NOAA> {{cite web |url = https://www.ncei.noaa.gov/access/services/data/v1?dataset=normals-monthly-1991-2020&stations=USW00024036&format=pdf&dataTypes=MLY-TMAX-NORMAL,MLY-TMIN-NORMAL,MLY-TAVG-NORMAL,MLY-PRCP-NORMAL,MLY-SNOW-NORMAL |publisher = National Oceanic and Atmospheric Administration |title = U.S. Climate Normals Quick Access - Station: Lewistown MUNI AP, MT (1991โ2020) |access-date = October 28, 2022 }} </ref><ref> {{cite web |url = https://www.ncei.noaa.gov/access/services/data/v1?dataset=normals-monthly&stations=USW00024036&format=pdf&dataTypes=MLY-TMAX-NORMAL,MLY-TMIN-NORMAL,MLY-TAVG-NORMAL,MLY-PRCP-NORMAL,MLY-SNOW-NORMAL |publisher = National Oceanic and Atmospheric Administration |title = U.S. Climate Normals Quick Access - Station: Lewistown MUNI AP, MT (1981โ2010) |access-date = October 28, 2022 }} </ref> |source 2 = National Weather Service<ref name = NOWData> {{cite web |url = https://www.weather.gov/wrh/climate?wfo=tfx |publisher = National Weather Service |title = NOAA Online Weather Data โ NWS Great Falls |access-date = October 28, 2022 }} </ref> }}
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