Compare the Climate and Weather in Ólafsvík and Unalaska

This page lets you compare and contrast the weather and climate in Ólafsvík and Unalaska year round.

You can drill down to a specific season, month, and even day by clicking the graphs or using the navigation panel.

You can compare up to 6 locations. Add more locations using the search box below or by clicking the map.

Alaska, United States

Average High and Low Temperature

Compare the Average High and Low Temperature in Ólafsvík and UnalaskaJanFebMarAprMayJunJulAugSepOctNovDec15°F15°F20°F20°F25°F25°F30°F30°F35°F35°F40°F40°F45°F45°F50°F50°F55°F55°F4830543749305635461827471826NowNowÓlafsvíkÓlafsvíkUnalaskaUnalaska
The daily average high and low air temperature at 2 meters above the ground. The thin dotted lines are the corresponding perceived temperatures.
Ólafsvík 37°F37°F37°F41°F45°F50°F53°F53°F49°F44°F41°F38°F
Unalaska 36°F36°F37°F39°F44°F50°F54°F56°F52°F46°F41°F38°F
Ólafsvík 31°F31°F31°F34°F39°F45°F48°F48°F44°F38°F35°F32°F
Unalaska 31°F31°F31°F34°F38°F43°F47°F49°F46°F40°F35°F33°F


Average Hourly Temperature in ÓlafsvíkJanFebMarAprMayJunJulAugSepOctNovDec12 AM12 AM4 AM4 AM8 AM8 AM12 PM12 PM4 PM4 PM8 PM8 PM12 AM12 AMNowNowvery coldvery coldcold


Average Hourly Temperature in UnalaskaJanFebMarAprMayJunJulAugSepOctNovDec12 AM12 AM4 AM4 AM8 AM8 AM12 PM12 PM4 PM4 PM8 PM8 PM12 AM12 AMNowNowvery coldvery coldcold
frigid 15°F freezing 32°F very cold 45°F cold 55°F cool 65°F comfortable 75°F warm 85°F hot 95°F sweltering
The average hourly temperature, color coded into bands. The shaded overlays indicate night and civil twilight.

Chance of Clearer Skies

Compare the Chance of Clearer Skies in Ólafsvík and UnalaskaJanFebMarAprMayJunJulAugSepOctNovDec0%0%10%10%20%20%30%30%40%40%50%50%60%60%70%70%80%80%90%90%100%100%43204118NowNowÓlafsvíkÓlafsvíkUnalaskaUnalaska
The percentage of time the sky is clear, mostly clear, or partly cloudy (i.e., less than 60% of the sky is covered by clouds).
Clearer SkiesJanFebMarAprMayJunJulAugSepOctNovDec
Ólafsvík 21%22%26%35%42%41%39%36%35%34%29%25%
Unalaska 23%25%29%32%33%24%19%25%35%40%34%26%

Daily Chance of Precipitation

Compare the Daily Chance of Precipitation in Ólafsvík and UnalaskaJanFebMarAprMayJunJulAugSepOctNovDec0%0%10%10%20%20%30%30%40%40%50%50%60%60%70%70%80%80%90%90%100%100%50224725NowNowÓlafsvíkÓlafsvíkUnalaskaUnalaska
The percentage of days in which precipitation is observed, excluding trace quantities.
Days of Precip.JanFebMarAprMayJunJulAugSepOctNovDec
Ólafsvík 15.0d14.4d13.5d10.4d8.6d7.1d8.0d10.4d11.9d12.8d13.6d14.8d
Unalaska 12.4d11.3d10.8d9.0d8.7d8.7d9.7d10.6d11.7d12.6d13.2d13.8d

Average Monthly Rainfall

Compare the Average Monthly Rainfall in Ólafsvík and UnalaskaJanFebMarAprMayJunJulAugSepOctNovDec0 in0 in1 in1 in2 in2 in3 in3 in4 in4 in3.91.61.7NowNowÓlafsvíkÓlafsvíkUnalaskaUnalaska
The average rainfall accumulated over the course of a sliding 31-day period centered on the day in question.
Ólafsvík 3.6″3.6″3.1″2.4″1.9″1.6″1.9″2.8″3.6″3.7″3.8″3.9″
Unalaska 3.0″2.5″2.1″1.8″2.1″2.3″2.4″2.7″3.5″3.8″3.7″4.0″

Average Monthly Snowfall

Compare the Average Monthly Snowfall in Ólafsvík and UnalaskaJanFebMarAprMayJunJulAugSepOctNovDec0 in0 in1 in1 in2 in2 in3 in3 in4 in4 in5 in5 in6 in6 in7 in7 in6.4NowNowÓlafsvíkÓlafsvíkUnalaskaUnalaska
The average snowfall accumulated over the course of a sliding 31-day period centered on the day in question.
Ólafsvík 6.3″6.0″4.3″1.1″0.1″0.0″0.0″0.0″0.0″0.1″1.5″4.4″
Unalaska 5.9″5.3″2.7″0.8″0.1″0.0″0.0″0.0″0.0″0.0″0.7″3.1″

Hours of Daylight

Compare the Hours of Daylight in Ólafsvík and UnalaskaJanFebMarAprMayJunJulAugSepOctNovDec4 hr4 hr6 hr6 hr8 hr8 hr10 hr10 hr12 hr12 hr14 hr14 hr16 hr16 hr18 hr18 hr20 hr20 hr21.93.717.17.4NowNowÓlafsvíkÓlafsvíkUnalaskaUnalaska
The number of hours during which the Sun is at least partly above the horizon.
Ólafsvík 5.2h8.5h11.9h15.3h18.9h21.5h19.9h16.4h13.0h9.6h6.2h3.9h
Unalaska 8.1h9.8h12.0h14.1h16.0h17.0h16.5h14.7h12.6h10.5h8.5h7.5h

Chance of Muggy Conditions

Compare the Chance of Muggy Conditions in Ólafsvík and UnalaskaJanFebMarAprMayJunJulAugSepOctNovDec0%0%10%10%20%20%30%30%40%40%50%50%60%60%70%70%80%80%90%90%100%100%NowNowÓlafsvíkÓlafsvík
The percentage of time that is muggy, oppressive, or miserable (i.e., a dew point greater than 65°F).
Muggy daysJanFebMarAprMayJunJulAugSepOctNovDec
Ólafsvík 0.0d0.0d0.0d0.0d0.0d0.0d0.0d0.0d0.0d0.0d0.0d0.0d
Unalaska 0.0d0.0d0.0d0.0d0.0d0.0d0.0d0.0d0.0d0.0d0.0d0.0d

Average Wind Speed

Compare the Average Wind Speed in Ólafsvík and UnalaskaJanFebMarAprMayJunJulAugSepOctNovDec0 mph0 mph2 mph2 mph4 mph4 mph6 mph6 mph8 mph8 mph10 mph10 mph12 mph12 mph14 mph14 mph16 mph16 mph18 mph18 mph20 mph20 mph22 mph22 mph21.411.720.2NowNowÓlafsvíkÓlafsvíkUnalaskaUnalaska
The average of mean hourly wind speeds at 10 meters above the ground.
Wind Speed (mph)JanFebMarAprMayJunJulAugSepOctNovDec
Ólafsvík 21.220.719.517.
Unalaska 19.118.718.217.214.312.211.512.616.118.519.719.5

Average Water Temperature

Compare the Average Water Temperature in Ólafsvík and UnalaskaJanFebMarAprMayJunJulAugSepOctNovDec38°F38°F40°F40°F42°F42°F44°F44°F46°F46°F48°F48°F50°F50°F52°F52°F52394939NowNowÓlafsvíkÓlafsvíkUnalaskaUnalaska
The daily average wide-area surface water temperature.
Water Temp.JanFebMarAprMayJunJulAugSepOctNovDec
Ólafsvík 41°F40°F40°F41°F43°F48°F51°F51°F49°F46°F44°F42°F
Unalaska 40°F39°F39°F39°F41°F44°F47°F49°F48°F45°F43°F41°F

Tourism Score

Compare the Tourism Score in Ólafsvík and UnalaskaJanFebMarAprMayJunJulAugSepOctNovDec002244668810101.81.3NowNowUnalaskaUnalaska
The tourism score, which favors clear, rainless days with perceived temperatures between 65°F and 80°F.

Beach/Pool Score

Compare the Beach/Pool Score in Ólafsvík and UnalaskaJanFebMarAprMayJunJulAugSepOctNovDec00224466881010NowNowÓlafsvíkÓlafsvík
The beach/pool score, which favors clear, rainless days with perceived temperatures between 75°F and 90°F.

Growing Season

Compare the Growing Season in Ólafsvík and UnalaskaJanFebMarAprMayJunJulAugSepOctNovDec0%0%20%20%40%40%60%60%80%80%100%100%NowNowÓlafsvíkÓlafsvíkUnalaskaUnalaska
The percentage chance that a given day is within the growing season, defined as the longest continuous period of non-freezing temperatures (≥ 32°F) in the year (the calendar year in the Northern Hemisphere, or from July 1 until June 30 in the Southern Hemisphere).

Growing Degree Days

Compare the Growing Degree Days in Ólafsvík and UnalaskaJanFebMarAprMayJunJulAugSepOctNovDec0°F0°F20°F20°F40°F40°F60°F60°F80°F80°F100°F100°F120°F120°F140°F140°F160°F160°FNowNowÓlafsvíkÓlafsvíkUnalaskaUnalaska
The average growing degree days accumulated over the course of the year, where growing degree days are defined as the integral of warmth above a base temperature (50°F in this case).

Average Daily Incident Shortwave Solar Energy

Compare the Average Daily Incident Shortwave Solar Energy in Ólafsvík and UnalaskaJanFebMarAprMayJunJulAugSepOctNovDec0.0 kWh0.0 kWh0.5 kWh0.5 kWh1.0 kWh1.0 kWh1.5 kWh1.5 kWh2.0 kWh2.0 kWh2.5 kWh2.5 kWh3.0 kWh3.0 kWh3.5 kWh3.5 kWh4.0 kWh4.0 kWh4.5 kWh4.5 kWh5.0 kWh5.0 kWh5.5 kWh5.5 kWh6.0 kWh6.0 kWh5.54.80.4NowNowÓlafsvíkÓlafsvíkUnalaskaUnalaska
The average daily shortwave solar energy reaching the ground per square meter.
Solar Energy (kWh)JanFebMarAprMayJunJulAugSepOctNovDec

This report illustrates the typical weather for Ólafsvík and Unalaska year round, based on a statistical analysis of historical hourly weather reports and model reconstructions from January 1, 1980 to December 31, 2016.

The details of the data sources used on this page vary between places and are discussed in detail on each place's dedicated page:


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We draw particular cautious attention to our reliance on the MERRA-2 model-based reconstructions for a number of important data series. While having the tremendous advantages of temporal and spatial completeness, these reconstructions: (1) are based on computer models that may have model-based errors, (2) are coarsely sampled on a 50 km grid and are therefore unable to reconstruct the local variations of many microclimates, and (3) have particular difficulty with the weather in some coastal areas, especially small islands.

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