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Windsor, Connecticut climate
Cfa Humid subtropical
Windsor has a seasonal cool-temperate climate (Humid subtropical, Köppen Cfa). The hottest month is July with an average daily high near 81°F, while the coldest is January averaging around 19°F at night. Precipitation is fairly even year-round, totalling about 49 inches. Winters bring significant snowfall (39 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 countsWindsor climate normals (1991–2020)
| Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Avg high (°F) | 35 | 37 | 45 | 57 | 68 | 76 | 81 | 79 | 73 | 61 | 50 | 40 |
| Avg temp (°F) | 27 | 29 | 36 | 48 | 58 | 66 | 72 | 70 | 63 | 52 | 42 | 33 |
| Avg low (°F) | 19 | 20 | 28 | 38 | 48 | 57 | 63 | 61 | 54 | 43 | 34 | 25 |
| Precipitation (in) | 3.7 | 3.0 | 4.4 | 4.2 | 3.7 | 4.5 | 4.0 | 4.3 | 4.5 | 4.6 | 3.9 | 4.5 |
| Snowfall (in) | 8.3 | 14.1 | 6.3 | 1.7 | — | — | — | — | — | 0.3 | 1.1 | 7.2 |
| Jan – Jun | Jan | Feb | Mar | Apr | May | Jun |
|---|---|---|---|---|---|---|
| Avg high (°F) | 35 | 37 | 45 | 57 | 68 | 76 |
| Avg temp (°F) | 27 | 29 | 36 | 48 | 58 | 66 |
| Avg low (°F) | 19 | 20 | 28 | 38 | 48 | 57 |
| Precipitation (in) | 3.7 | 3.0 | 4.4 | 4.2 | 3.7 | 4.5 |
| Snowfall (in) | 8.3 | 14.1 | 6.3 | 1.7 | — | — |
| Jul – Dec | Jul | Aug | Sep | Oct | Nov | Dec |
|---|---|---|---|---|---|---|
| Avg high (°F) | 81 | 79 | 73 | 61 | 50 | 40 |
| Avg temp (°F) | 72 | 70 | 63 | 52 | 42 | 33 |
| Avg low (°F) | 63 | 61 | 54 | 43 | 34 | 25 |
| Precipitation (in) | 4.0 | 4.3 | 4.5 | 4.6 | 3.9 | 4.5 |
| Snowfall (in) | — | — | — | 0.3 | 1.1 | 7.2 |
How often — frequency of weather events
| Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Days with measurable rain (days) | 8 | 7 | 9 | 9 | 11 | 10 | 9 | 9 | 9 | 9 | 8 | 10 |
| Days with high ≥ 90°F (days) | — | — | — | 0.0 | 0.1 | 0.3 | 1 | 0.6 | 0.1 | — | — | — |
| Days with low ≤ 32°F (days) | 22 | 21 | 20 | 6 | 0.2 | — | — | — | 0.0 | 2 | 12 | 23 |
| Days with snowfall ≥ 1 in (days) | 2 | 2 | 2 | 0.3 | — | — | — | — | — | 0.0 | 0.3 | 2 |
| Jan – Jun | Jan | Feb | Mar | Apr | May | Jun |
|---|---|---|---|---|---|---|
| Days with measurable rain (days) | 8 | 7 | 9 | 9 | 11 | 10 |
| Days with high ≥ 90°F (days) | — | — | — | 0.0 | 0.1 | 0.3 |
| Days with low ≤ 32°F (days) | 22 | 21 | 20 | 6 | 0.2 | — |
| Days with snowfall ≥ 1 in (days) | 2 | 2 | 2 | 0.3 | — | — |
| Jul – Dec | Jul | Aug | Sep | Oct | Nov | Dec |
|---|---|---|---|---|---|---|
| Days with measurable rain (days) | 9 | 9 | 9 | 9 | 8 | 10 |
| Days with high ≥ 90°F (days) | 1 | 0.6 | 0.1 | — | — | — |
| Days with low ≤ 32°F (days) | — | — | 0.0 | 2 | 12 | 23 |
| Days with snowfall ≥ 1 in (days) | — | — | — | 0.0 | 0.3 | 2 |
Sky & atmosphere
| Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Cloud cover (%) | 64 | 61 | 62 | 63 | 63 | 61 | 57 | 54 | 53 | 57 | 61 | 63 |
| Clear days (≤ 30% cloud) | 5 | 6 | 6 | 6 | 5 | 5 | 7 | 8 | 9 | 8 | 6 | 5 |
| Partly cloudy days (30–70%) | 12 | 10 | 11 | 10 | 12 | 12 | 13 | 12 | 10 | 10 | 10 | 12 |
| Cloudy days (≥ 70%) | 14 | 13 | 14 | 14 | 15 | 13 | 11 | 11 | 11 | 13 | 14 | 14 |
| Relative humidity (%) | 89 | 88 | 84 | 79 | 78 | 77 | 73 | 72 | 73 | 78 | 82 | 87 |
| Wind speed (mph) | 0.9 | 1.2 | 0.9 | 0.3 | 0.1 | 0.1 | 0.1 | 0.1 | 0.1 | 0.2 | 0.2 | 0.3 |
| Jan – Jun | Jan | Feb | Mar | Apr | May | Jun |
|---|---|---|---|---|---|---|
| Cloud cover (%) | 64 | 61 | 62 | 63 | 63 | 61 |
| Clear days (≤ 30% cloud) | 5 | 6 | 6 | 6 | 5 | 5 |
| Partly cloudy days (30–70%) | 12 | 10 | 11 | 10 | 12 | 12 |
| Cloudy days (≥ 70%) | 14 | 13 | 14 | 14 | 15 | 13 |
| Relative humidity (%) | 89 | 88 | 84 | 79 | 78 | 77 |
| Wind speed (mph) | 0.9 | 1.2 | 0.9 | 0.3 | 0.1 | 0.1 |
| Jul – Dec | Jul | Aug | Sep | Oct | Nov | Dec |
|---|---|---|---|---|---|---|
| Cloud cover (%) | 57 | 54 | 53 | 57 | 61 | 63 |
| Clear days (≤ 30% cloud) | 7 | 8 | 9 | 8 | 6 | 5 |
| Partly cloudy days (30–70%) | 13 | 12 | 10 | 10 | 10 | 12 |
| Cloudy days (≥ 70%) | 11 | 11 | 11 | 13 | 14 | 14 |
| Relative humidity (%) | 73 | 72 | 73 | 78 | 82 | 87 |
| Wind speed (mph) | 0.1 | 0.1 | 0.1 | 0.2 | 0.2 | 0.3 |
Methodology & sources
Temperature & precipitation — the official 1991–2020 climate normals from NOAA's U.S. Climate Normals, measured at Storrs (NOAA GHCN station USC00068138), about 35 km from the city centre.
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.