Portland
The tables below display average monthly climate and weather indicators in Portland Maine.
Temperature by: Fahrenheit / Centigrade
| Portland Temperature |
Jan |
Feb |
Mar |
Apr |
May |
Jun |
Jul |
Aug |
Sep |
Oct |
Nov |
Dec |
Annual |
| Avg. Temperature | 39.6 | 43.6 | 47.3 | 51.0 | 57.1 | 63.5 | 68.2 | 68.6 | 63.3 | 54.5 | 46.1 | 40.2 | 53.6 |
| Avg. Max Temperature | 45.4 | 51.0 | 56.0 | 60.6 | 67.1 | 74.0 | 79.9 | 80.3 | 74.6 | 64.0 | 52.6 | 45.6 | 62.6 |
| Avg. Min Temperature | 33.7 | 36.1 | 38.6 | 41.3 | 47.0 | 52.9 | 56.5 | 56.9 | 52.0 | 44.9 | 39.5 | 34.8 | 44.5 |
| Days with Max Temp of 90 F or Higher | 0.0 | 0.0 | 0.0 | 0.0 | < 0.5 | 1.0 | 4.0 | 4.0 | 2.0 | 0.0 | 0.0 | 0.0 | 11.0 |
| Days with Min Temp Below Freezing | 13.0 | 8.0 | 4.0 | 1.0 | 2.0 | 0.0 | 0.0 | 0.0 | 0.0 | 1.0 | 5.0 | 9.0 | 41.0 |
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| Portland Heating and Cooling |
Jan |
Feb |
Mar |
Apr |
May |
Jun |
Jul |
Aug |
Sep |
Oct |
Nov |
Dec |
Annual |
| Heating Degree Days | 787 | 599 | 549 | 420 | 249 | 91.0 | 28.0 | 35.0 | 102 | 326 | 567 | 769 | 4522 |
| Cooling Degree Days | 0.0 | 0.0 | 0.0 | 0.0 | 0.0 | 46.0 | 127 | 147 | 51.0 | 0.0 | 0.0 | 0.0 | 371 |
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| Portland Precipitation |
Jan |
Feb |
Mar |
Apr |
May |
Jun |
Jul |
Aug |
Sep |
Oct |
Nov |
Dec |
Annual |
| Precipitation (inches) | 5.4 | 3.9 | 3.6 | 2.4 | 2.1 | 1.5 | 0.6 | 1.1 | 1.8 | 2.7 | 5.3 | 6.1 | 36.3 |
| Days with Precipitation 0.01 inch or More | 18.0 | 16.0 | 17.0 | 14.0 | 12.0 | 9.0 | 4.0 | 5.0 | 8.0 | 12.0 | 18.0 | 19.0 | 152 |
| Monthly Snowfall (inches) | 3.2 | 1.1 | 0.4 | 3.0 | 0.0 | 0.0 | 0.0 | 0.0 | < 0.05 | 0.0 | 0.4 | 1.4 | 6.5 |
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| Other Portland Weather Indicators |
Jan |
Feb |
Mar |
Apr |
May |
Jun |
Jul |
Aug |
Sep |
Oct |
Nov |
Dec |
Annual |
| Average Wind Speed | 10.0 | 9.2 | 8.3 | 7.4 | 7.1 | 7.2 | 7.6 | 7.1 | 6.5 | 6.5 | 8.6 | 9.6 | 7.9 |
| Clear Days | 3.0 | 3.0 | 3.0 | 3.0 | 5.0 | 6.0 | 13.0 | 11.0 | 10.0 | 5.0 | 3.0 | 2.0 | 68.0 |
| Partly Cloudy Days | 4.0 | 4.0 | 5.0 | 6.0 | 7.0 | 8.0 | 8.0 | 10.0 | 8.0 | 8.0 | 4.0 | 3.0 | 74.0 |
| Cloudy Days | 24.0 | 21.0 | 23.0 | 21.0 | 19.0 | 16.0 | 10.0 | 10.0 | 12.0 | 18.0 | 23.0 | 26.0 | 222 |
| Percent of Possible Sunshine | 28.0 | 38.0 | 48.0 | 52.0 | 57.0 | 56.0 | 69.0 | 66.0 | 62.0 | 44.0 | 28.0 | 23.0 | 48.0 |
| Avg. Relative Humidity | 71.5 | 80.0 | 76.0 | 73.0 | 70.0 | 68.0 | 65.5 | 64.0 | 65.5 | 69.0 | 75.0 | 80.0 | 81.5 |
Weather information for other cities in Maine