Climate
Adak lies in the maritime climate zone, characterized by persistently overcast skies, moderated temperatures, high winds, and frequent cyclonic storms.
At Adak, overcast conditions average nearly 75% of the time during June and July, dropping back to approximately 50% of the time from October through February. Adak averages 173 days per year with fog. The foggiest months are July and August when an average of 26 of the 31 days have fog. This number drops dramatically toward the winter season where the months of December through March have, on average, fewer than ten days with fog during any one month.
Gales occur in all months of the year at Adak with the greatest chance from December through March. A peak gust of 109 knots occurred at Adak in March 1954.
Adak's average temperatures range from 20 to 60 degrees Fahrenheit, with a record high of 75°F (August 1956) and a record low of 3°F (January 1963 and February 1964).
Total precipitation is 64 inches annually, with an average accumulated snowfall of 100 inches, falling primarily on the upper reaches of the volcanoes. Adak has an average of 341 days per year with measureable precipitation.
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