Anchorage Weather Averages

Anchorage, Alaska usually has seven months of wintery weather followed by five months of mild temperatures and long days.

This page gives detailed information on annual temperature, precipitation, snow, sun, humidity, wind and storm averages for Anchorage.

The numbers here are historical averages based on climate data gathered at the Ted Stevens Anchorage International Airport, located a few miles from downtown Anchorage.

Temperature Weather iconTemperature

44 °F annual average high 7 °C
30 °F annual average low -1 °C

Anchorage's coldest days of the year usually occur in mid January when the daily maximum temperature averages 23 degrees Fahrenheit (11 degrees Celsius) and the minimum averages -5 °F (-12 °C).

The year's hottest days are normally in mid July. The average temperature peaks then with daily highs of 66 °F (19 °C) and nighttime lows of 53 °F (12 °C).

85 days 60 °F max. or more (16 °C)
188 days 32 °F min. or less (0 °C)

Anchorage averages 12 days a year when the thermometer reaches into the 70s °F (over 21 °C). Most years, the temperature doesn't climb above 80 °F (26 °C). Typically 102 days annually stay entirely below freezing.

The temperature dips to 10 °F (-12 °C) or below on an average of 50 nights a year. On 20 of those nights, Anchorage gets at least as cold as 0 °F (-18 °C).

Rainy Weather iconPrecipitation

16.6 in total precipitation 421 mm
115 days of rain or snowfall

August is usually the wettest month of the year in Anchorage, while April is the driest.

Snowy Weather iconSnow

74.5 in total snowfall 189.2 cm
48 days with new snow

Most years, it snows in Anchorage from October to April. The snowpack accumulates to at least 10 inches (25 cm) deep on an average of 66 days annually.

Sunny Weather iconSun

41 % sunshine
61 days clear skies

The sun's rays reach the ground in Anchorage during 41 percent of daylight hours on average year round, for a total of 1857 hours annually. Typically on 61 days a year the sky is mainly clear, with at most 30 percent cloud cover.

Sunlight in Anchorage averages 12 hours and 24 minutes a day. The shortest days of the year in mid December have 5 hours and 27 minutes of daylight. The year's longest days in mid June last 19:22 from sunrise to sunset.

Humid Weather iconHumidity

71 % average humidity

The annual average for relative humidity in Anchorage ranges throughout the day from 77 percent at 6:00 am to 64 percent at 3:00 pm standard time.

Local Time12 am3 am6 am9 am12 pm3 pm6 pm9 pm
Humidity % 74 76 77 74 67 64 66 71

Windy Weather iconWind

7.1 mph wind speed average 11.4 kph

May is usually the windiest month for Anchorage, and the wind is calmest during December.

Stormy Weather iconStorms

3 days snowfall of 5 inches (13 cm) or more
1 day with thunderstorms a year

Thunderstorms don't happen every year in Anchorage. May to September are the months when thunderstorms might appear over the city.

Reference

These weather data are long-term historical averages provided by the National Climatic Data Center of the United States. The temperature and precipitation numbers are 1981-2010 normals while the humidity and thunderstorm statistics are 1961-1990 normals.

Anchorage Weather
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