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South Portland Gardens, Maine climate
Dfb Warm-summer humid continental
South Portland Gardens has a strongly seasonal cool-temperate climate (Warm-summer humid continental, Köppen Dfb). The hottest month is July with an average daily high near 26°C, while the coldest is January averaging around −9°C at night. Precipitation is fairly even year-round, totalling about 1222 mm. Snowfall is heavy (174 cm of snow per year on average).
Temperature & precipitation
Daily high–low temperature range with the monthly average, plus monthly precipitation split into rain and snow · 1991–2020 normals · hover a month for the exact figuresClear vs cloudy days
Share of days each month that are clear, partly cloudy or cloudy · 1991–2020 · hover a month for the day countsSouth Portland Gardens climate normals (1991–2020)
| Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Avg high (°C) | 0 | 2 | 6 | 12 | 18 | 23 | 26 | 26 | 22 | 15 | 9 | 4 |
| Avg temp (°C) | −4 | −3 | 1 | 7 | 13 | 18 | 21 | 21 | 16 | 10 | 4 | −1 |
| Avg low (°C) | −9 | −8 | −3 | 2 | 8 | 13 | 16 | 15 | 11 | 5 | 0 | −5 |
| Precipitation (mm) | 89 | 90 | 104 | 112 | 93 | 105 | 87 | 91 | 96 | 133 | 108 | 114 |
| Snowfall (cm) | 47 | 42 | 35 | 7 | — | — | — | — | — | 1 | 6 | 37 |
| Jan – Jun | Jan | Feb | Mar | Apr | May | Jun |
|---|---|---|---|---|---|---|
| Avg high (°C) | 0 | 2 | 6 | 12 | 18 | 23 |
| Avg temp (°C) | −4 | −3 | 1 | 7 | 13 | 18 |
| Avg low (°C) | −9 | −8 | −3 | 2 | 8 | 13 |
| Precipitation (mm) | 89 | 90 | 104 | 112 | 93 | 105 |
| Snowfall (cm) | 47 | 42 | 35 | 7 | — | — |
| Jul – Dec | Jul | Aug | Sep | Oct | Nov | Dec |
|---|---|---|---|---|---|---|
| Avg high (°C) | 26 | 26 | 22 | 15 | 9 | 4 |
| Avg temp (°C) | 21 | 21 | 16 | 10 | 4 | −1 |
| Avg low (°C) | 16 | 15 | 11 | 5 | 0 | −5 |
| Precipitation (mm) | 87 | 91 | 96 | 133 | 108 | 114 |
| Snowfall (cm) | — | — | — | 1 | 6 | 37 |
How often — frequency of weather events
| Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Days with measurable rain (days) | 11 | 10 | 11 | 11 | 12 | 12 | 11 | 9 | 9 | 11 | 11 | 12 |
| Days with high ≥ 32°C (days) | — | — | — | 0.0 | 0.4 | 1 | 2 | 1 | 0.5 | — | — | — |
| Days with low ≤ 0°C (days) | 29 | 26 | 25 | 12 | 0.7 | — | — | — | 0.1 | 6 | 18 | 27 |
| Days with snowfall ≥ 2.5 cm (days) | 5 | 4 | 3 | 0.7 | — | — | — | — | — | 0.1 | 0.7 | 3 |
| Jan – Jun | Jan | Feb | Mar | Apr | May | Jun |
|---|---|---|---|---|---|---|
| Days with measurable rain (days) | 11 | 10 | 11 | 11 | 12 | 12 |
| Days with high ≥ 32°C (days) | — | — | — | 0.0 | 0.4 | 1 |
| Days with low ≤ 0°C (days) | 29 | 26 | 25 | 12 | 0.7 | — |
| Days with snowfall ≥ 2.5 cm (days) | 5 | 4 | 3 | 0.7 | — | — |
| Jul – Dec | Jul | Aug | Sep | Oct | Nov | Dec |
|---|---|---|---|---|---|---|
| Days with measurable rain (days) | 11 | 9 | 9 | 11 | 11 | 12 |
| Days with high ≥ 32°C (days) | 2 | 1 | 0.5 | — | — | — |
| Days with low ≤ 0°C (days) | — | — | 0.1 | 6 | 18 | 27 |
| Days with snowfall ≥ 2.5 cm (days) | — | — | — | 0.1 | 0.7 | 3 |
Sky & atmosphere
| Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Cloud cover (%) | 66 | 64 | 63 | 63 | 66 | 64 | 57 | 54 | 54 | 60 | 63 | 64 |
| Clear days (≤ 30% cloud) | 3 | 4 | 6 | 6 | 5 | 5 | 7 | 8 | 9 | 7 | 5 | 5 |
| Partly cloudy days (30–70%) | 12 | 11 | 11 | 10 | 11 | 11 | 13 | 12 | 10 | 10 | 10 | 12 |
| Cloudy days (≥ 70%) | 15 | 13 | 15 | 14 | 16 | 14 | 12 | 11 | 11 | 14 | 14 | 15 |
| Relative humidity (%) | 86 | 84 | 82 | 83 | 86 | 88 | 87 | 85 | 83 | 81 | 80 | 83 |
| Wind speed (mph) | 11.5 | 11.3 | 10.1 | 8.0 | 6.4 | 5.7 | 5.2 | 5.6 | 6.8 | 8.8 | 10.0 | 11.0 |
| Jan – Jun | Jan | Feb | Mar | Apr | May | Jun |
|---|---|---|---|---|---|---|
| Cloud cover (%) | 66 | 64 | 63 | 63 | 66 | 64 |
| Clear days (≤ 30% cloud) | 3 | 4 | 6 | 6 | 5 | 5 |
| Partly cloudy days (30–70%) | 12 | 11 | 11 | 10 | 11 | 11 |
| Cloudy days (≥ 70%) | 15 | 13 | 15 | 14 | 16 | 14 |
| Relative humidity (%) | 86 | 84 | 82 | 83 | 86 | 88 |
| Wind speed (mph) | 11.5 | 11.3 | 10.1 | 8.0 | 6.4 | 5.7 |
| Jul – Dec | Jul | Aug | Sep | Oct | Nov | Dec |
|---|---|---|---|---|---|---|
| Cloud cover (%) | 57 | 54 | 54 | 60 | 63 | 64 |
| Clear days (≤ 30% cloud) | 7 | 8 | 9 | 7 | 5 | 5 |
| Partly cloudy days (30–70%) | 13 | 12 | 10 | 10 | 10 | 12 |
| Cloudy days (≥ 70%) | 12 | 11 | 11 | 14 | 14 | 15 |
| Relative humidity (%) | 87 | 85 | 83 | 81 | 80 | 83 |
| Wind speed (mph) | 5.2 | 5.6 | 6.8 | 8.8 | 10.0 | 11.0 |
Methodology & sources
Temperature & precipitation — the official 1991–2020 climate normals from NOAA's U.S. Climate Normals, measured at Portland Jetport (NOAA GHCN station USW00014764), inside the city.
Cloud, humidity, wind & sunshine — modelled estimates from NASA POWER, NASA's satellite-and-reanalysis climatology. This is the standard global source for atmospheric variables, which are not measured at most weather stations.