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===Climate=== [[File:Monthly Climate Normals (1991-2020) - ILIAMNA AIRPORT, AK.svg|thumb|right|Climate chart for Iliamna]] Iliamna has a [[continental subarctic climate]] ([[Köppen climate classification|Köppen]] ''Dfc'') with mild summers and severely cold winters. Iliamna's year-round average temperature is {{convert|37.7|F|1}}, with five months averaging below freezing ({{convert|32|F|0}}) and three months averaging above {{convert|50|F|0}}, July is the warmest month with an average temperature of {{convert|57.8|F|1}} and January is the coldest month with an average temperature of {{convert|18.4|F|1}}.<ref name=NOAA/> Winters are sometimes very cold, and in some years there are even low temperatures below {{convert|-40|F|0}}, usually 32 days have a minimum {{convert|0|F|0}} or below annually, and the coldest temperature in a year can drop to {{convert|-21|F|0}}, so Iliamna falls in [[Hardiness zone|USDA Plant Hardiness Zone]]s 4b.<ref>{{cite web |url=http://planthardiness.ars.usda.gov/PHZMWeb/# |title=USDA Plant Hardiness Zone Map |publisher=Agricultural Research Center, PRISM Climate Group Oregon State University |access-date=November 1, 2019 |quote=Input 99603 in the ZIP Code box. |archive-url=https://web.archive.org/web/20140227032333/http://planthardiness.ars.usda.gov/PHZMWeb/ |archive-date=February 27, 2014 |url-status=dead }}</ref> The coldest day of the year averaged {{convert|-11|F|C}} in the 1991 to 2020 normals, while the warmest night average was at {{convert|57|F|C}}. The coldest daytime maximum on record is {{convert|-33|F|C}} on January 19, 1947, while, conversely, the record warm daily minimum is {{convert|61|F|C}} on August 13, 2019.<ref name = NOWData/> Extreme temperatures have ranged from {{convert|-47|°F|0}} on January 22, 1947, up to {{convert|91|°F|0}} on June 27, 1953.<ref name = NOWData/> The coldest month has been January 1947 and December 1942 with a mean temperature of {{convert|-6.5|F|1}}, while the warmest month was July 2019 at {{convert|63.2|F|1}}; the annual mean temperature has ranged from {{convert|28.2|F|1}} in 1956 to {{convert|42.1|F|1}} in 2019.<ref name = NOWData/> Iliamna receives {{convert|25.01|inch|0}} of annual precipitation, mostly between [[summer]] and [[fall]].<ref name=NOAA/> September 1961 was the wettest month, with {{convert|11.02|inch|0}} of precipitation, and there were many months without recorded precipitation. The wettest year was 1985 with {{convert|40.79|inch|0}} of precipitation, while the driest was 1968 with {{convert|15.33|inch|0}}.<ref name = NOWData/> {{Weather box |location = [[Iliamna Airport]], Alaska (1991–2020 normals, extremes 1920–present{{efn|Temperatures have been recorded at Iliamna Airport since April 1920, with there being periods of no recording during March 1923-March 1941 and December 1973-June 1975.}}) |single line = Y |Jan record high F = 57 |Feb record high F = 50 |Mar record high F = 52 |Apr record high F = 67 |May record high F = 80 |Jun record high F = 91 |Jul record high F = 86 |Aug record high F = 83 |Sep record high F = 75 |Oct record high F = 66 |Nov record high F = 52 |Dec record high F = 49 |year record high F = 91 |Jan avg record high F = 42.4 |Feb avg record high F = 42.6 |Mar avg record high F = 43.5 |Apr avg record high F = 54.2 |May avg record high F = 67.6 |Jun avg record high F = 74.3 |Jul avg record high F = 76.8 |Aug avg record high F = 73.4 |Sep avg record high F = 64.1 |Oct avg record high F = 54.4 |Nov avg record high F = 45.7 |Dec avg record high F = 43.2 |year avg record high F = 78.8 |Jan high F = 24.8 |Feb high F = 29.9 |Mar high F = 31.7 |Apr high F = 43.3 |May high F = 54.7 |Jun high F = 62.0 |Jul high F = 64.9 |Aug high F = 63.5 |Sep high F = 56.0 |Oct high F = 44.6 |Nov high F = 33.2 |Dec high F = 28.0 |year high F = 44.7 |Jan mean F = 18.4 |Feb mean F = 23.1 |Mar mean F = 23.7 |Apr mean F = 36.1 |May mean F = 46.3 |Jun mean F = 53.7 |Jul mean F = 57.8 |Aug mean F = 56.7 |Sep mean F = 49.7 |Oct mean F = 38.4 |Nov mean F = 27.1 |Dec mean F = 21.7 |year mean F = 37.7 |Jan low F = 11.9 |Feb low F = 16.3 |Mar low F = 15.7 |Apr low F = 28.8 |May low F = 37.9 |Jun low F = 45.4 |Jul low F = 50.7 |Aug low F = 49.9 |Sep low F = 43.3 |Oct low F = 32.3 |Nov low F = 21.0 |Dec low F = 15.3 |year low F = 30.7 |Jan avg record low F = -16.9 |Feb avg record low F = -11.0 |Mar avg record low F = -6.7 |Apr avg record low F = 10.1 |May avg record low F = 28.3 |Jun avg record low F = 36.4 |Jul avg record low F = 43.4 |Aug avg record low F = 39.8 |Sep avg record low F = 30.6 |Oct avg record low F = 16.0 |Nov avg record low F = -0.6 |Dec avg record low F = -9.6 |year avg record low F = -21.0 |Jan record low F = -47 |Feb record low F = -46 |Mar record low F = -30 |Apr record low F = -30 |May record low F = 4 |Jun record low F = 28 |Jul record low F = 30 |Aug record low F = 22 |Sep record low F = 20 |Oct record low F = -4 |Nov record low F = -20 |Dec record low F = -31 |year record low F = -47 |precipitation colour = green |Jan precipitation inch = 0.90 |Feb precipitation inch = 1.06 |Mar precipitation inch = 0.84 |Apr precipitation inch = 0.83 |May precipitation inch = 1.19 |Jun precipitation inch = 1.51 |Jul precipitation inch = 3.08 |Aug precipitation inch = 4.14 |Sep precipitation inch = 5.01 |Oct precipitation inch = 2.84 |Nov precipitation inch = 2.16 |Dec precipitation inch = 1.45 |year precipitation inch = 25.01 |unit precipitation days = 0.01 in |Jan precipitation days = 7.7 |Feb precipitation days = 8.7 |Mar precipitation days = 7.5 |Apr precipitation days = 8.0 |May precipitation days = 8.9 |Jun precipitation days = 9.5 |Jul precipitation days = 13.5 |Aug precipitation days = 15.9 |Sep precipitation days = 16.2 |Oct precipitation days = 13.3 |Nov precipitation days = 11.8 |Dec precipitation days = 10.7 |year precipitation days = 131.6 |Jan dew point F = 10.0 |Feb dew point F = 16.8 |Mar dew point F = 13.3 |Apr dew point F = 25.1 |May dew point F = 33.7 |Jun dew point F = 42.3 |Jul dew point F = 48.6 |Aug dew point F = 48.3 |Sep dew point F = 40.9 |Oct dew point F = 29.9 |Nov dew point F = 18.4 |Dec dew point F = 13.4 |year dew point F = 28.4 |source 1 = NOAA / National Weather Service<ref name=NOAA> {{cite web |url = https://www.ncei.noaa.gov/access/services/data/v1?dataset=normals-monthly-1991-2020&stations=USW00025506&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 = September 12, 2022 |archive-url = https://web.archive.org/web/20230507035819/https://www.ncei.noaa.gov/access/services/data/v1?dataset=normals-monthly-1991-2020&stations=USW00025506&format=pdf&dataTypes=MLY-TMAX-NORMAL,MLY-TMIN-NORMAL,MLY-TAVG-NORMAL,MLY-PRCP-NORMAL,MLY-SNOW-NORMAL |archive-date = May 7, 2023 }} </ref><ref name = NOWData> {{cite web |url = https://www.weather.gov/wrh/climate?wfo=afc |publisher = National Weather Service |title = NOAA Online Weather Data |access-date = September 12, 2022 }} </ref> |source 2 = [[Western Regional Climate Center]] (dew point 1998–2011)<ref>{{Cite web |url = https://wrcc.dri.edu/htmlfiles/westcomp.dp.html |title = AVERAGE MONTHLY DEW POINT TEMPERATURE (F) |publisher = WRCC |access-date = July 29, 2023 |archive-url = https://web.archive.org/web/20230729102110/https://wrcc.dri.edu/htmlfiles/westcomp.dp.html |archive-date = July 29, 2023}}</ref> }}
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