Anchorage, Alaska (Dena'ina: Dgheyay Kaq'; Dgheyaytnu)[1] has a subarctic climate with the code Dsc according to the Köppen climate classification due to its short, cool summers.[2] The weather on any given day is very unpredictable. Some winters feature several feet of snow and cold temperatures, while the summers are typically mild but are cool compared to the contiguous US and interior Alaska. Because of Anchorage's high latitude, summer days are very long and winter daylight hours are very short. The longest day of sunlight being 18hrs and 21 minutes, and shortest being 5 hours and 28 minutes.[3] Anchorage is often cloudy during the winter, which decreases the amount of sunlight experienced by residents.
Average daytime summer temperatures range from approximately Script error: No such module "convert".;[4] average daytime winter temperatures are about Script error: No such module "convert"..[4] Anchorage has a frost-free growing season that averages slightly over one hundred days. Average January low and high temperatures at Ted Stevens Anchorage International Airport (PANC) are 11 / 23 °F (−11.7 / −5.0 °C) with an average winter snowfall of 75.59 inches, or 1.92 meters. Farther afield at the Campbell Airstrip is another weather station recording colder night temperatures in both summer and winter.[4]
Average July low and high temperatures are 52 / 66 °F (11.1 / 18.9 °C) and the hottest reading ever recorded was 90 °F or 32.2 °C on July 4, 2019.[5]
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January 27, 2014 January 19, 1961
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Feb 27, 2014
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Mar 31, 2016
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Apr 29, 2005
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May 21, 2002 May 24, 1969
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Jun 14, 1969
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Jul 4, 2019
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Aug 2, 1978 Aug 21, 1977 Aug 6, 1968
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Sep 5, 1957
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Oct 9, 2006
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Nov 26, 2002
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Dec 9, 2019
Lowest daily temperatures
Period
Record temperature
Date
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Jan 5, 1975
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Feb 4, 1999
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Mar 7, 1971
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Apr 2, 1985
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May 10, 1964
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Jun 4, 1961
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Jul 1, 1964
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Aug 31, 1984 Aug 28, 1984
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Sep 24, 1992
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Oct 31, 1956
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Nov 17, 1956
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Dec 27–28, 1961 Dec 14, 1964
Daily record warm minima
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Period
Record temperature
Date
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Jan 20, 1990
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Feb 25, 1978
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Mar 26, 1970
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Apr 27, 2015 Apr 29, 2005
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May 31, 1993
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Jun 16, 2015
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Jul 10, 2005
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Aug 13–14, 2019
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Sep 6, 1993 Sep 5, 1965
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Oct 10, 1986
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Nov 9–10, 1979
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Dec 11, 2017 Dec 28, 1982
Daily record cold maxima
Period
Record temperature
Date
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Jan 28, 1989
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Feb 3–4, 1999
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Mar 7, 1971
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Apr 1, 1985
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May 9, 1964
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Jun 1–2, 1973
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Jul 27, 1971
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Aug 21, 1985 Aug 25, 1983
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Sep 30, 1992
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Oct 31, 1975
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Nov 29–30, 1990
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Dec 28, 1961
Precipitation
Rainfall
Between 2000 and 2022 the annual rainfall in Anchorage was 16.7 inches.[6] The months with the highest average mean of rain were August and September, each having an annual mean of 2.75 inches (August) and 3.24 inches (September).
For snowfall, the annual mean average for 2000 to 2022 was 76.4 inches;[7] the highest snowfall season being 2011 - 2012 with 134.5 inches, and the lowest season being 25.1 inches in 2015.
Climate change
Based on the ERA5 data published by ECMWF, the annual mean temperature of Anchorage has increased from 0.8 °C in 1940 to 3.8 °C in 2022, an increase of 3 °C.[8]
The mayor and the assembly of Anchorage in 2019 issued a climate action plan for the anticipated effects that climate change will have on its city and people.[9] The action plan includes all of the municipality of Anchorage, as far north as Eklutna and as south as Portage. One of the major goals of the climate action plan is to reduce green house gas emissions by 80% by the year 2050 from its 2008 emission levels. The first annual report on this came out in 2021. For its near term plans, the city also introduced a plan called the "Municipality of Anchorage Climate Action Strategy."
Due to its proximity to active volcanoes, ash hazards are a significant, though infrequent, occurrence. The most recent notable incident was an August 1992 mark of Mt. Spurr, which is located Script error: No such module "convert". west of the city.Template:Update inline The eruption deposited about Script error: No such module "convert". of volcanic ash on the city.[10] The cleanup of ash resulted in excessive demands for water and caused major problems for the Anchorage Water and Wastewater Utility.Script error: No such module "Unsubst".
On March 17, 2002, there was a storm that caused 28.6 in of snow to close schools for two days.[11] The storm broke the city record for the most snowfall in a single day. The storm beat the previous record from 1955 on March 16, which was just 15.6 inches. The National Weather Service also recorded this same snow data.[12]
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