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== Climate == {{stack|[[File:Crater Lake winter pano.jpg|thumb|320px|November panorama from [[Rim Village Historic District|Rim Village]]. During the winter, the road up to Rim Village is normally plowed but [[Rim Drive]] is closed.]]}} According to the [[Köppen climate classification]] system, Crater Lake National Park has a dry-summer [[subarctic climate]] (''Dsc''). The [[plant hardiness zone]] at the lake is 6b with an average annual extreme minimum air temperature of {{convert|−3.7|°F}}.<ref name="USDA">{{cite web|url=https://planthardiness.ars.usda.gov/PHZMWeb/InteractiveMap.aspx|publisher=[[United States Department of Agriculture]]|access-date=2019-07-03|title=USDA Interactive Plant Hardiness Map|archive-date=July 4, 2019|archive-url=https://web.archive.org/web/20190704214427/https://planthardiness.ars.usda.gov/phzmweb/interactivemap.aspx|url-status=dead}}</ref> Snow is relatively rare at low elevations in western Oregon, but it is common at higher elevations, especially at Crater Lake. Measurements at park headquarters, {{convert|6475|ft|m}} above sea level, show that snow falls more often here than at any other long-term weather station in Oregon. Winter, which typically begins at the park in September and runs through June, includes an average of 101 days with measurable snowfall. Up to {{convert|37|in|cm}} of snow have fallen on the park in a single day (in 1937, 1951, and 1971), {{convert|313|in|cm}} in a month (January 1950), and {{convert|903|in|cm}} in a year (1950).<ref name="Taylor 39-41">Taylor and Hannan, pp. 39–41</ref> Snow typically accumulates in the park to depths of {{convert|10|to|15|ft|m}} by early spring. Most of the park's roads remain closed through late spring, and snow lingers into the summer. In July and August, snowfall is uncommon, and "one magnificent day typically follows another".<ref>{{cite web|title=Plan Your Visit|url=http://www.nps.gov/crla/planyourvisit/index.htm|publisher=National Park Service|year=2011|access-date=November 11, 2011}}</ref> December is the coldest month, when highs average about {{convert|33|F|C}} and lows average about {{convert|19|F|C}}. August is the warmest month, with an average high of roughly {{convert|69|F|C}} and an average low of about {{convert|42|F|C}}. The highest recorded temperature was {{convert|100|F|C}} and the lowest was {{convert|-21|F|C}}. Annual precipitation averages about {{convert|67|in|mm}} a year. December is the wettest, averaging about {{convert|11|in|mm}}. Although snow covers Crater Lake National Park for eight months of the year (average annual snowfall is {{convert|463|in|cm}}), the lake rarely freezes over due, in part, to a relatively mild onshore flow from the [[Pacific Ocean]]. The last recorded year in which the lake froze over was in 1949, a very long, cold winter. A 95% surface freeze occurred in 1985. The immense depth of Crater Lake acts as a heat reservoir that absorbs and traps sunlight, maintaining the lake temperature at an average of {{convert|55|F}} on the surface and {{convert|38|F}} at the bottom throughout the year. The surface temperature fluctuates a bit, but the bottom temperature remains quite constant. {{Weather box|width=auto |location = Crater Lake National Park Headquarters, Oregon, 1991–2020 normals, extremes 1919–present |single line = Y |Jan record high F = 64 |Feb record high F = 66 |Mar record high F = 67 |Apr record high F = 71 |May record high F = 80 |Jun record high F = 96 |Jul record high F = 100 |Aug record high F = 94 |Sep record high F = 93 |Oct record high F = 81 |Nov record high F = 71 |Dec record high F = 64 |year record high F = |Jan avg record high F = 49.4 |Feb avg record high F = 49.5 |Mar avg record high F = 53.0 |Apr avg record high F = 59.3 |May avg record high F = 66.7 |Jun avg record high F = 73.8 |Jul avg record high F = 81.1 |Aug avg record high F = 81.8 |Sep avg record high F = 77.7 |Oct avg record high F = 69.7 |Nov avg record high F = 56.4 |Dec avg record high F = 47.7 |year avg record high F = 83.3 |Jan high F = 33.4 |Feb high F = 33.6 |Mar high F = 36.1 |Apr high F = 40.3 |May high F = 49.0 |Jun high F = 57.0 |Jul high F = 68.9 |Aug high F = 69.3 |Sep high F = 63.0 |Oct high F = 50.7 |Nov high F = 38.0 |Dec high F = 32.7 |year high F = |Jan mean F = 26.6 |Feb mean F = 26.3 |Mar mean F = 28.2 |Apr mean F = 31.7 |May mean F = 39.2 |Jun mean F = 45.3 |Jul mean F = 55.1 |Aug mean F = 55.4 |Sep mean F = 50.1 |Oct mean F = 40.4 |Nov mean F = 30.6 |Dec mean F = 25.9 |year mean F = |Jan low F = 19.8 |Feb low F = 18.9 |Mar low F = 20.3 |Apr low F = 23.1 |May low F = 29.3 |Jun low F = 33.6 |Jul low F = 41.4 |Aug low F = 41.5 |Sep low F = 37.1 |Oct low F = 30.2 |Nov low F = 23.2 |Dec low F = 19.1 |year low F = |Jan avg record low F = 5.9 |Feb avg record low F = 5.4 |Mar avg record low F = 6.6 |Apr avg record low F = 10.3 |May avg record low F = 17.1 |Jun avg record low F = 24.2 |Jul avg record low F = 31.7 |Aug avg record low F = 31.4 |Sep avg record low F = 26.1 |Oct avg record low F = 17.8 |Nov avg record low F = 9.0 |Dec avg record low F = 4.2 |year avg record low F = -0.7 |Jan record low F = -21 |Feb record low F = -18 |Mar record low F = -7 |Apr record low F = -3 |May record low F = 5 |Jun record low F = 10 |Jul record low F = 18 |Aug record low F = 16 |Sep record low F = 16 |Oct record low F = 3 |Nov record low F = -7 |Dec record low F = -18 |year record low F = |precipitation colour = green |Jan precipitation inch = 10.10 |Feb precipitation inch = 7.53 |Mar precipitation inch = 7.81 |Apr precipitation inch = 6.16 |May precipitation inch = 3.65 |Jun precipitation inch = 2.27 |Jul precipitation inch = 0.80 |Aug precipitation inch = 0.83 |Sep precipitation inch = 1.93 |Oct precipitation inch = 4.80 |Nov precipitation inch = 9.60 |Dec precipitation inch = 11.28 |year precipitation inch = |Jan snow inch = 86.5 |Feb snow inch = 68.9 |Mar snow inch = 71.9 |Apr snow inch = 48.7 |May snow inch = 14.5 |Jun snow inch = 3.7 |Jul snow inch = 0.0 |Aug snow inch = 0.0 |Sep snow inch = 1.8 |Oct snow inch = 17.2 |Nov snow inch = 59.3 |Dec snow inch = 90.6 |year snow inch = |unit precipitation days = 0.01 in |Jan precipitation days = 17.9 |Feb precipitation days = 16.7 |Mar precipitation days = 18.0 |Apr precipitation days = 16.5 |May precipitation days = 11.5 |Jun precipitation days = 7.4 |Jul precipitation days = 3.5 |Aug precipitation days = 3.7 |Sep precipitation days = 5.3 |Oct precipitation days = 10.6 |Nov precipitation days = 16.7 |Dec precipitation days = 18.4 |unit snow days = 0.1 in |Jan snow days = 16.2 |Feb snow days = 14.8 |Mar snow days = 15.4 |Apr snow days = 13.2 |May snow days = 5.5 |Jun snow days = 1.8 |Jul snow days = 0.0 |Aug snow days = 0.0 |Sep snow days = 0.9 |Oct snow days = 4.7 |Nov snow days = 12.1 |Dec snow days = 16.1 |Jan snow depth inch = 92.0 |Feb snow depth inch = 106.4 |Mar snow depth inch = 121.1 |Apr snow depth inch = 113.4 |May snow depth inch = 89.3 |Jun snow depth inch = 42.5 |Jul snow depth inch = 4.3 |Aug snow depth inch = 0.0 |Sep snow depth inch = 1.4 |Oct snow depth inch = 10.7 |Nov snow depth inch = 32.0 |Dec snow depth inch = 66.0 |year snow depth inch = 124.3 |Jan sun = 124.0 |Feb sun = 141.3 |Mar sun = 217.0 |Apr sun = 240.0 |May sun = 310.0 |Jun sun = 330.0 |Jul sun = 372.0 |Aug sun = 341.0 |Sep sun = 270.0 |Oct sun = 217.0 |Nov sun = 90.0 |Dec sun = 93.0 |Jan percentsun = 44 |Feb percentsun = 45 |Mar percentsun = 58 |Apr percentsun = 62 |May percentsun = 67 |Jun percentsun = 73 |Jul percentsun = 80 |Aug percentsun = 79 |Sep percentsun = 75 |Oct percentsun = 64 |Nov percentsun = 30 |Dec percentsun = 33 |Jan uv = 2 |Feb uv = 2 |Mar uv = 4 |Apr uv = 6 |May uv = 8 |Jun uv = 9 |Jul uv = 9 |Aug uv = 8 |Sep uv = 6 |Oct uv = 4 |Nov uv = 2 |Dec uv = 1 |source 1 = NOAA<ref name=NOAA> {{cite web |url = https://www.ncei.noaa.gov/access/services/data/v1?dataset=normals-monthly-1991-2020&stations=USC00351946&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 |access-date = October 12, 2022 }} </ref><ref name=NOWData> {{cite web |url = https://www.weather.gov/wrh/climate?wfo=mfr |publisher = National Weather Service |title = NOAA Online Weather Data |access-date = October 12, 2022 }} </ref> |source 2= Weather Atlas <ref name="Weather Atlas"> {{cite web |url=https://www.weather-us.com/en/oregon-usa/crater-lake-climate |title=Crater Lake, Oregon, USA – Monthly weather forecast and Climate data |publisher=Weather Atlas |access-date=12 October 2022 |archive-date=August 19, 2019 |archive-url=https://web.archive.org/web/20190819052240/https://www.weather-us.com/en/oregon-usa/crater-lake-climate |url-status=live }} </ref> (sunshine data, UV index) }}
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