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Lewiston, Maine climate
Dfb Warm-summer humid continental
Lewiston has a strongly seasonal cool-temperate climate (Warm-summer humid continental, Köppen Dfb). The hottest month is July with an average daily high near 80°F, while the coldest is January averaging around 12°F at night. Precipitation is fairly even year-round, totalling about 45 inches. Snowfall is heavy (65 inches 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 countsLewiston climate normals (1991–2020)
| Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Avg high (°F) | 28 | 32 | 40 | 53 | 65 | 74 | 80 | 79 | 70 | 58 | 45 | 34 |
| Avg temp (°F) | 20 | 23 | 31 | 44 | 56 | 65 | 71 | 70 | 61 | 49 | 38 | 27 |
| Avg low (°F) | 12 | 14 | 23 | 35 | 46 | 56 | 62 | 60 | 52 | 41 | 31 | 20 |
| Precipitation (in) | 3.3 | 3.2 | 3.5 | 4.0 | 3.2 | 4.3 | 3.5 | 3.4 | 3.7 | 4.9 | 3.9 | 4.2 |
| Snowfall (in) | 19.4 | 17.3 | 12.3 | 2.9 | — | — | — | — | — | — | 1.6 | 11.6 |
| Jan – Jun | Jan | Feb | Mar | Apr | May | Jun |
|---|---|---|---|---|---|---|
| Avg high (°F) | 28 | 32 | 40 | 53 | 65 | 74 |
| Avg temp (°F) | 20 | 23 | 31 | 44 | 56 | 65 |
| Avg low (°F) | 12 | 14 | 23 | 35 | 46 | 56 |
| Precipitation (in) | 3.3 | 3.2 | 3.5 | 4.0 | 3.2 | 4.3 |
| Snowfall (in) | 19.4 | 17.3 | 12.3 | 2.9 | — | — |
| Jul – Dec | Jul | Aug | Sep | Oct | Nov | Dec |
|---|---|---|---|---|---|---|
| Avg high (°F) | 80 | 79 | 70 | 58 | 45 | 34 |
| Avg temp (°F) | 71 | 70 | 61 | 49 | 38 | 27 |
| Avg low (°F) | 62 | 60 | 52 | 41 | 31 | 20 |
| Precipitation (in) | 3.5 | 3.4 | 3.7 | 4.9 | 3.9 | 4.2 |
| Snowfall (in) | — | — | — | — | 1.6 | 11.6 |
How often — frequency of weather events
| Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Days with measurable rain (days) | 10 | 8 | 11 | 10 | 10 | 11 | 10 | 9 | 8 | 8 | 8 | 10 |
| Days with high ≥ 90°F (days) | — | — | — | — | 0.5 | 2 | 2 | 2 | 0.5 | — | — | — |
| Days with low ≤ 32°F (days) | 18 | 16 | 15 | 6 | 0.2 | — | — | — | 0.1 | 3 | 9 | 15 |
| Days with snowfall ≥ 1 in (days) | 4 | 4 | 3 | 0.7 | — | — | — | — | — | — | 0.4 | 3 |
| Jan – Jun | Jan | Feb | Mar | Apr | May | Jun |
|---|---|---|---|---|---|---|
| Days with measurable rain (days) | 10 | 8 | 11 | 10 | 10 | 11 |
| Days with high ≥ 90°F (days) | — | — | — | — | 0.5 | 2 |
| Days with low ≤ 32°F (days) | 18 | 16 | 15 | 6 | 0.2 | — |
| Days with snowfall ≥ 1 in (days) | 4 | 4 | 3 | 0.7 | — | — |
| Jul – Dec | Jul | Aug | Sep | Oct | Nov | Dec |
|---|---|---|---|---|---|---|
| Days with measurable rain (days) | 10 | 9 | 8 | 8 | 8 | 10 |
| Days with high ≥ 90°F (days) | 2 | 2 | 0.5 | — | — | — |
| Days with low ≤ 32°F (days) | — | — | 0.1 | 3 | 9 | 15 |
| Days with snowfall ≥ 1 in (days) | — | — | — | — | 0.4 | 3 |
Sky & atmosphere
| Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Cloud cover (%) | 69 | 64 | 64 | 67 | 69 | 68 | 62 | 58 | 57 | 66 | 68 | 67 |
| Clear days (≤ 30% cloud) | 3 | 4 | 5 | 5 | 4 | 4 | 5 | 6 | 7 | 5 | 4 | 4 |
| Partly cloudy days (30–70%) | 11 | 11 | 10 | 9 | 9 | 10 | 13 | 13 | 10 | 9 | 10 | 11 |
| Cloudy days (≥ 70%) | 17 | 13 | 15 | 16 | 18 | 16 | 13 | 12 | 12 | 17 | 16 | 16 |
| Relative humidity (%) | 91 | 91 | 86 | 81 | 80 | 81 | 80 | 78 | 77 | 80 | 84 | 88 |
| Wind speed (mph) | 1.9 | 2.4 | 2.3 | 1.4 | 1.0 | 0.9 | 0.8 | 0.9 | 1.0 | 1.1 | 1.2 | 1.3 |
| Jan – Jun | Jan | Feb | Mar | Apr | May | Jun |
|---|---|---|---|---|---|---|
| Cloud cover (%) | 69 | 64 | 64 | 67 | 69 | 68 |
| Clear days (≤ 30% cloud) | 3 | 4 | 5 | 5 | 4 | 4 |
| Partly cloudy days (30–70%) | 11 | 11 | 10 | 9 | 9 | 10 |
| Cloudy days (≥ 70%) | 17 | 13 | 15 | 16 | 18 | 16 |
| Relative humidity (%) | 91 | 91 | 86 | 81 | 80 | 81 |
| Wind speed (mph) | 1.9 | 2.4 | 2.3 | 1.4 | 1.0 | 0.9 |
| Jul – Dec | Jul | Aug | Sep | Oct | Nov | Dec |
|---|---|---|---|---|---|---|
| Cloud cover (%) | 62 | 58 | 57 | 66 | 68 | 67 |
| Clear days (≤ 30% cloud) | 5 | 6 | 7 | 5 | 4 | 4 |
| Partly cloudy days (30–70%) | 13 | 13 | 10 | 9 | 10 | 11 |
| Cloudy days (≥ 70%) | 13 | 12 | 12 | 17 | 16 | 16 |
| Relative humidity (%) | 80 | 78 | 77 | 80 | 84 | 88 |
| Wind speed (mph) | 0.8 | 0.9 | 1.0 | 1.1 | 1.2 | 1.3 |
Methodology & sources
Temperature & precipitation — the official 1991–2020 climate normals from NOAA's U.S. Climate Normals, measured at Lewiston (NOAA GHCN station USC00174566), 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.