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Jamestown, New York climate
Dfa Hot-summer humid continental
Jamestown has a strongly seasonal cool-temperate climate (Hot-summer humid continental, Köppen Dfa). The hottest month is July with an average daily high near 79°F, while the coldest is January averaging around 20°F at night. Precipitation is fairly even year-round, totalling about 37 inches. Winters bring significant snowfall (48 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 figuresHours of sunshine per day
Estimated sunny hours each month — daylight length × clear-sky fraction · 1991–2020 monthly cloud cover (NASA POWER)Jamestown climate normals (1991–2020)
| Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Avg high (°F) | 32 | 33 | 41 | 53 | 66 | 75 | 79 | 79 | 72 | 60 | 48 | 38 |
| Avg temp (°F) | 26 | 26 | 34 | 45 | 57 | 67 | 72 | 71 | 64 | 53 | 42 | 32 |
| Avg low (°F) | 20 | 20 | 27 | 37 | 48 | 59 | 65 | 64 | 57 | 46 | 36 | 27 |
| Precipitation (in) | 3.0 | 2.0 | 2.6 | 3.3 | 3.1 | 3.0 | 3.1 | 3.3 | 3.5 | 3.9 | 3.3 | 3.0 |
| Snowfall (in) | 13.9 | 10.9 | 8.0 | 1.2 | 0.0 | — | — | — | — | 0.3 | 2.3 | 11.2 |
| Jan – Jun | Jan | Feb | Mar | Apr | May | Jun |
|---|---|---|---|---|---|---|
| Avg high (°F) | 32 | 33 | 41 | 53 | 66 | 75 |
| Avg temp (°F) | 26 | 26 | 34 | 45 | 57 | 67 |
| Avg low (°F) | 20 | 20 | 27 | 37 | 48 | 59 |
| Precipitation (in) | 3.0 | 2.0 | 2.6 | 3.3 | 3.1 | 3.0 |
| Snowfall (in) | 13.9 | 10.9 | 8.0 | 1.2 | 0.0 | — |
| Jul – Dec | Jul | Aug | Sep | Oct | Nov | Dec |
|---|---|---|---|---|---|---|
| Avg high (°F) | 79 | 79 | 72 | 60 | 48 | 38 |
| Avg temp (°F) | 72 | 71 | 64 | 53 | 42 | 32 |
| Avg low (°F) | 65 | 64 | 57 | 46 | 36 | 27 |
| Precipitation (in) | 3.1 | 3.3 | 3.5 | 3.9 | 3.3 | 3.0 |
| Snowfall (in) | — | — | — | 0.3 | 2.3 | 11.2 |
Sky & atmosphere
| Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Cloud cover (%) | 82 | 80 | 79 | 77 | 76 | 71 | 66 | 64 | 64 | 70 | 78 | 83 |
| Relative humidity (%) | 86 | 84 | 81 | 78 | 76 | 74 | 71 | 71 | 73 | 77 | 81 | 85 |
| Wind speed (mph) | 11.5 | 10.7 | 9.0 | 7.8 | 6.2 | 5.9 | 6.1 | 6.1 | 6.9 | 8.4 | 9.4 | 10.4 |
| Jan – Jun | Jan | Feb | Mar | Apr | May | Jun |
|---|---|---|---|---|---|---|
| Cloud cover (%) | 82 | 80 | 79 | 77 | 76 | 71 |
| Relative humidity (%) | 86 | 84 | 81 | 78 | 76 | 74 |
| Wind speed (mph) | 11.5 | 10.7 | 9.0 | 7.8 | 6.2 | 5.9 |
| Jul – Dec | Jul | Aug | Sep | Oct | Nov | Dec |
|---|---|---|---|---|---|---|
| Cloud cover (%) | 66 | 64 | 64 | 70 | 78 | 83 |
| Relative humidity (%) | 71 | 71 | 73 | 77 | 81 | 85 |
| Wind speed (mph) | 6.1 | 6.1 | 6.9 | 8.4 | 9.4 | 10.4 |
Methodology & sources
Temperature & precipitation — 1991–2020 normals computed from 29 years of daily observations at Port Colborne, a weather station, about 87 km from the city centre. The underlying daily records come from NOAA's global station network.
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.