Climate and Average Weather Year Round in Maine United States

We show the climate in Maine by comparing the average weather in 3 representative places: Portland, Bangor, and Caribou.

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Portland
Maine, United States
Bangor
Maine, United States
Caribou
Maine, United States
Map

Average High and Low Temperature in Maine

Average High and Low Temperature in MaineJanFebMarAprMayJunJulAugSepOctNovDec-10°F-10°F0°F0°F10°F10°F20°F20°F30°F30°F40°F40°F50°F50°F60°F60°F70°F70°F80°F80°F6216783210285732024-912NowNowBangorBangorCaribouCaribouPortlandPortland
The daily average high and low air temperature at 2 meters above the ground. The thin dotted lines are the corresponding perceived temperatures.
HighJanFebMarAprMayJunJulAugSepOctNovDec
Portland 32°F34°F42°F53°F63°F72°F78°F76°F69°F58°F47°F37°F
Bangor 28°F31°F40°F53°F65°F74°F79°F77°F69°F57°F45°F34°F
Caribou 21°F24°F35°F49°F62°F71°F76°F74°F65°F52°F39°F26°F
LowJanFebMarAprMayJunJulAugSepOctNovDec
Portland 17°F19°F27°F37°F46°F55°F61°F60°F53°F42°F33°F23°F
Bangor 11°F14°F24°F35°F45°F54°F60°F58°F50°F40°F30°F19°F
Caribou 4°F7°F18°F31°F43°F52°F57°F55°F47°F37°F26°F13°F

Portland

Average Hourly Temperature in PortlandJanFebMarAprMayJunJulAugSepOctNovDec12 AM12 AM4 AM4 AM8 AM8 AM12 PM12 PM4 PM4 PM8 PM8 PM12 AM12 AMNowNowfreezingfreezingvery coldcoldcoldcoolcomfortablewarm

Bangor

Average Hourly Temperature in BangorJanFebMarAprMayJunJulAugSepOctNovDec12 AM12 AM4 AM4 AM8 AM8 AM12 PM12 PM4 PM4 PM8 PM8 PM12 AM12 AMNowNowfreezingfreezingvery coldcoldcoldcoolwarmfrigidcomfortable

Caribou

Average Hourly Temperature in CaribouJanFebMarAprMayJunJulAugSepOctNovDec12 AM12 AM4 AM4 AM8 AM8 AM12 PM12 PM4 PM4 PM8 PM8 PM12 AM12 AMNowNowfrigidfrigidfreezingfreezingvery coldcoldcoldcoolcomfortablevery coldfrigid
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 in Maine

Chance of Clearer Skies in MaineJanFebMarAprMayJunJulAugSepOctNovDec0%0%10%10%20%20%30%30%40%40%50%50%60%60%70%70%80%80%90%90%100%100%6443426031NowNowBangorBangorCaribouCaribouPortlandPortland
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
Portland 48%48%46%45%44%50%57%61%62%57%50%47%
Bangor 46%44%43%43%42%49%57%60%60%55%47%45%
Caribou 32%33%37%42%42%47%55%59%57%49%41%36%

Daily Chance of Precipitation in Maine

Daily Chance of Precipitation in MaineJanFebMarAprMayJunJulAugSepOctNovDec0%0%10%10%20%20%30%30%40%40%50%50%60%60%70%70%80%80%90%90%100%100%33223646NowNowBangorBangorCaribouCaribouPortlandPortland
The percentage of days in which precipitation is observed, excluding trace quantities.
Days of Precip.JanFebMarAprMayJunJulAugSepOctNovDec
Portland 7.4d6.8d8.1d8.4d9.3d9.6d10.0d8.6d8.0d8.6d8.5d8.8d
Bangor 7.7d6.8d8.2d8.4d9.9d10.4d10.7d8.9d7.9d8.5d8.6d8.8d
Caribou 7.6d6.4d7.7d9.0d10.8d11.9d13.5d11.0d9.5d9.7d9.1d8.6d

Average Monthly Rainfall in Maine

Average Monthly Rainfall in MaineJanFebMarAprMayJunJulAugSepOctNovDec0 in0 in1 in1 in2 in2 in3 in3 in4 in4 in5 in5 in4.31.54.03.80.5NowNowBangorBangorCaribouCaribouPortlandPortland
The average rainfall accumulated over the course of a sliding 31-day period centered on the day in question.
RainfallJanFebMarAprMayJunJulAugSepOctNovDec
Portland 1.5″2.0″2.9″3.7″3.5″3.4″3.0″2.9″3.4″4.2″3.9″2.6″
Bangor 1.3″1.4″2.2″3.2″3.4″3.5″3.0″2.9″3.4″4.0″3.7″2.2″
Caribou 0.7″0.5″0.9″2.0″2.9″3.3″3.8″3.3″3.0″3.1″2.4″1.2″

Average Monthly Snowfall in Maine

Average Monthly Snowfall in MaineJanFebMarAprMayJunJulAugSepOctNovDec0 in0 in2 in2 in4 in4 in6 in6 in8 in8 in10 in10 in12 in12 in14 in14 in16 in16 in14.714.0NowNowBangorBangorCaribouCaribouPortlandPortland
The average snowfall accumulated over the course of a sliding 31-day period centered on the day in question.
SnowfallJanFebMarAprMayJunJulAugSepOctNovDec
Portland 14.7″11.7″7.0″1.4″0.0″0.0″0.0″0.0″0.0″0.3″2.9″11.4″
Bangor 13.9″12.2″9.1″1.7″0.0″0.0″0.0″0.0″0.0″0.3″4.3″12.2″
Caribou 13.3″13.6″11.6″3.0″0.2″0.0″0.0″0.0″0.0″0.9″6.3″13.4″

Hours of Daylight in Maine

Hours of Daylight in MaineJanFebMarAprMayJunJulAugSepOctNovDec4 hr4 hr6 hr6 hr8 hr8 hr10 hr10 hr12 hr12 hr14 hr14 hr16 hr16 hr18 hr18 hr20 hr20 hr15.48.9NowNowBangorBangorCaribouCaribouPortlandPortland
The number of hours during which the Sun is at least partly above the horizon.
DaylightJanFebMarAprMayJunJulAugSepOctNovDec
Portland 9.4h10.5h12.0h13.5h14.8h15.4h15.0h13.9h12.5h11.0h9.7h9.0h
Bangor 9.2h10.5h12.0h13.5h14.9h15.5h15.2h14.0h12.5h10.9h9.6h8.9h
Caribou 9.0h10.3h12.0h13.6h15.1h15.8h15.4h14.1h12.5h10.8h9.4h8.6h

Chance of Muggy Conditions in Maine

Chance of Muggy Conditions in MaineJanFebMarAprMayJunJulAugSepOctNovDec0%0%10%10%20%20%30%30%40%40%50%50%60%60%70%70%80%80%90%90%100%100%261811NowNowBangorBangorCaribouCaribouPortlandPortland
The percentage of time that is muggy, oppressive, or miserable (i.e., a dew point greater than 65°F).
Muggy daysJanFebMarAprMayJunJulAugSepOctNovDec
Portland 0.0d0.0d0.0d0.0d0.1d1.9d6.6d6.0d1.7d0.1d0.0d0.0d
Bangor 0.0d0.0d0.0d0.0d0.1d1.5d4.6d4.3d1.2d0.1d0.0d0.0d
Caribou 0.0d0.0d0.0d0.0d0.0d1.0d2.9d2.5d0.7d0.0d0.0d0.0d

Average Wind Speed in Maine

Average Wind Speed in MaineJanFebMarAprMayJunJulAugSepOctNovDec0 mph0 mph1 mph1 mph2 mph2 mph3 mph3 mph4 mph4 mph5 mph5 mph6 mph6 mph7 mph7 mph8 mph8 mph9 mph9 mph10 mph10 mph11 mph11 mph10.25.36.73.98.4NowNowBangorBangorCaribouCaribouPortlandPortland
The average of mean hourly wind speeds at 10 meters above the ground.
Wind Speed (mph)JanFebMarAprMayJunJulAugSepOctNovDec
Portland 10.010.19.57.96.65.95.55.66.57.88.79.4
Bangor 6.26.56.55.84.94.44.04.04.65.25.55.7
Caribou 7.98.28.27.66.55.95.45.35.96.46.97.2

Average Water Temperature in Maine

Average Water Temperature in MaineJanFebMarAprMayJunJulAugSepOctNovDec35°F35°F40°F40°F45°F45°F50°F50°F55°F55°F60°F60°F65°F65°F63385736NaNNowNowBangorBangorPortlandPortland
The daily average wide-area surface water temperature.
Water Temp.JanFebMarAprMayJunJulAugSepOctNovDec
Portland 42°F39°F38°F41°F47°F55°F61°F62°F59°F54°F49°F45°F
Bangor 40°F37°F37°F40°F45°F50°F55°F57°F56°F52°F49°F44°F

Tourism Score in Maine

Tourism Score in MaineJanFebMarAprMayJunJulAugSepOctNovDec002244668810106.96.2NowNowBangorBangorCaribouCaribouPortlandPortland
The tourism score, which favors clear, rainless days with perceived temperatures between 65°F and 80°F.

Beach/Pool Score in Maine

Beach/Pool Score in MaineJanFebMarAprMayJunJulAugSepOctNovDec002244668810104.73.4NowNowBangorBangorCaribouCaribouPortlandPortland
The beach/pool score, which favors clear, rainless days with perceived temperatures between 75°F and 90°F.

Growing Season in Maine

Growing Season in MaineJanFebMarAprMayJunJulAugSepOctNovDec0%0%20%20%40%40%60%60%80%80%100%100%NowNowBangorBangorCaribouCaribouPortlandPortland
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 in Maine

Growing Degree Days in MaineJanFebMarAprMayJunJulAugSepOctNovDec0°F0°F500°F500°F1,000°F1,000°F1,500°F1,500°F2,000°F2,000°F2,500°F2,500°FNowNowBangorBangorCaribouCaribouPortlandPortland
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 in Maine

Average Daily Incident Shortwave Solar Energy in MaineJanFebMarAprMayJunJulAugSepOctNovDec0 kWh0 kWh1 kWh1 kWh2 kWh2 kWh3 kWh3 kWh4 kWh4 kWh5 kWh5 kWh6 kWh6 kWh7 kWh7 kWh6.81.56.41.1NowNowBangorBangorCaribouCaribouPortlandPortland
The average daily shortwave solar energy reaching the ground per square meter.
Solar Energy (kWh)JanFebMarAprMayJunJulAugSepOctNovDec
Portland 1.82.73.85.05.96.56.55.94.73.22.01.5
Bangor 1.72.63.74.95.86.46.45.84.53.01.81.4
Caribou 1.42.33.54.75.66.26.25.54.22.61.51.2

This report illustrates the typical weather for Portland, Bangor, and Caribou 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:

Disclaimer

The information on this site is provided as is, without any assurances as to its accuracy or suitability for any purpose. Weather data is prone to errors, outages, and other defects. We assume no responsibility for any decisions made on the basis of the content presented on this site.

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.

We further caution that our travel scores are only as good as the data that underpin them, that weather conditions at any given location and time are unpredictable and variable, and that the definition of the scores reflects a particular set of preferences that may not agree with those of any particular reader.

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