Alyeska, AK Climate

Climate Insight: Alyeska, AK

Based on station USC00500243 feeding NOAA's 1991–2020 climate normals, Alyeska, Alaska averages 39°F a year, ranging from a mean daily high of 46°F to a mean daily low of 31°F. July is typically the warmest month of the year, while January is the coldest. Because these figures are thirty-year averages rather than any single year's readings, they describe the typical month, not a forecast for it.

Beyond temperature, Alyeska averages 70.9 inches of precipitation annually, with 214.5 inches typically falling as snow - a real factor for anyone planning to live, garden, or travel here. The frost-free season averages 144 days, which directly shapes the planting calendar and growing potential for the area, with the last spring freeze near May 8 and the first fall freeze near September 29. Turning to energy use, 9,565 heating degree days and 6 cooling degree days tell the story of how often furnaces and air conditioners run during a normal year.

On PlainClimate's composite comfort index, Alyeska scores 24/100 (Below Average), a blended measure that weighs temperature mildness, precipitation moderation, and extreme-weather frequency against one another. The monthly tables above turn that into a planning tool: expect the mildest highs and lows in the shoulder seasons, July-driven heat at the peak of summer, and January-driven cold at the depth of winter. Every number here is a thirty-year average, not a forecast, so any given year can and does run warmer, cooler, wetter, or drier than the normal.