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Climate & Temperature > Usa > Portland, Maine Climate
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Portland, Maine Climate & Temperature

Portland, Maine Climate Graph
  • Portland, Maine, Usa is at 4338'N, 7018'W, 19 m (62 ft). See map.
  • Portland, Maine has a humid continental climate with severe winters, no dry season, warm summers and strong seasonality (Kppen-Geiger classification: Dfb).
  • According to the Holdridge life zones system of bioclimatic classification Portland, Maine is situated in or near the cool temperate wet forest biome.
  • The annual mean temperature is 7.4 degrees Celsius (45.3 degrees Fahrenheit). See the temperatures page for a monthly breakdown and the fixed scale graph.
  • Average monthly temperatures vary by 26.5 °C (47.7°F). This indicates that the continentality type is continental, subtype subcontinental.
  • In the winter time records indicate temperatures by day reach 0.5°C (32.8°F) on average falling to -9.9°C (14.2°F) overnight.
  • In spring time temperatures climb reaching 11.3°C (52.3°F) generally in the afternoon with overnight lows of 1.1°C (34°F).
  • During summer average high temperatures are 24.6°C (76.3°F) and average low temperatures are 13.2°C (55.8°F).
  • Come autumn/ fall temperatures decrease achieving average highs of 14.6°C (58.3°F) during the day and lows of 4°C (39.2°F) generally shortly after sunrise.
  • Total annual Precipitation averages 1126.3 mm (44.3 inches) which is equivalent to 1126.3 Litres/m (27.63 Gallons/ft).
  • On average there are 2592 hours of sunshine per year. Visit the sunshine and daylight section to check monthly details including how high in the sky the sun reaches each month.
  • If you were to burrow down through the Earth from Portland, Maine you would come out nearest to the climate station at Albany, Western Australia, Australia where you would find a Mediterranean climate.
Climate Variable Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec Annual
maximum temperature iconAverage Max Temperature °C ( °F) -1 (30) 1 (33) 5 (41) 11 (52) 17 (63) 23 (73) 26 (79) 25 (77) 21 (69) 15 (59) 8 (47) 2 (35) 13 (55)
average temperature iconAverage Temperature °C ( °F) -6 (21) -5 (23) 1 (33) 6 (43) 12 (53) 17 (62) 20 (69) 20 (67) 15 (59) 9 (49) 4 (39) -3 (26) 7 (45)
minimum temperature iconAverage Min Temperature °C ( °F) -11 (11) -10 (13) -4 (24) 1 (34) 6 (43) 11 (52) 15 (58) 14 (57) 9 (49) 4 (38) -1 (30) -8 (18) 2 (36)
rainfall iconAverage Precipitation mm (in) 90 (4) 85 (3) 93 (4) 104 (4) 92 (4) 87 (3) 79 (3) 73 (3) 79 (3) 99 (4) 131 (5) 116 (5) 1126 (44)
rain days iconNumber of Wet Days (probability of rain on a day) 12 (39%) 11 (39%) 12 (39%) 12 (40%) 13 (42%) 12 (40%) 10 (32%) 10 (32%) 10 (33%) 9 (29%) 11 (37%) 11 (35%)   133 (36%)
sunshine iconAverage Sunlight Hours/ Day 04:40 05:48 06:29 07:02 08:27 09:34 10:09 09:23 07:50 06:30 04:32 04:36   07:05
daylight iconAverage Daylight Hours & Minutes/ Day 09:19 10:24 11:51 13:23 14:41 15:22 15:04 13:56 12:27 10:55 09:37 08:58   12:00
sunny or cloudy iconPercentage of Sunny (Cloudy) Daylight Hours 51 (49) 57 (43) 56 (44) 53 (47) 58 (42) 63 (37) 68 (32) 68 (32) 64 (36) 61 (39) 48 (52) 52 (48)   59 (41)
sun altitude iconSun altitude at solar noon on the 21st day (). 26.5 35.9 46.7 58.4 66.6 69.8 66.7 58.3 46.9 35.4 26.3 23   46.7

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