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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 26°C, while the coldest is January averaging around −7°C at night. Precipitation is fairly even year-round, totalling about 945 mm. Winters bring significant snowfall (121 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 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 (°C) | 0 | 0 | 5 | 12 | 19 | 24 | 26 | 26 | 22 | 16 | 9 | 3 |
| Avg temp (°C) | −3 | −3 | 1 | 7 | 14 | 19 | 22 | 22 | 18 | 12 | 6 | 0 |
| Avg low (°C) | −7 | −7 | −3 | 3 | 9 | 15 | 18 | 18 | 14 | 8 | 2 | −3 |
| Precipitation (mm) | 76 | 50 | 67 | 84 | 80 | 76 | 78 | 85 | 90 | 100 | 83 | 75 |
| Snowfall (cm) | 35 | 28 | 20 | 3 | 0 | — | — | — | — | 1 | 6 | 28 |
| Jan – Jun | Jan | Feb | Mar | Apr | May | Jun |
|---|---|---|---|---|---|---|
| Avg high (°C) | 0 | 0 | 5 | 12 | 19 | 24 |
| Avg temp (°C) | −3 | −3 | 1 | 7 | 14 | 19 |
| Avg low (°C) | −7 | −7 | −3 | 3 | 9 | 15 |
| Precipitation (mm) | 76 | 50 | 67 | 84 | 80 | 76 |
| Snowfall (cm) | 35 | 28 | 20 | 3 | 0 | — |
| Jul – Dec | Jul | Aug | Sep | Oct | Nov | Dec |
|---|---|---|---|---|---|---|
| Avg high (°C) | 26 | 26 | 22 | 16 | 9 | 3 |
| Avg temp (°C) | 22 | 22 | 18 | 12 | 6 | 0 |
| Avg low (°C) | 18 | 18 | 14 | 8 | 2 | −3 |
| Precipitation (mm) | 78 | 85 | 90 | 100 | 83 | 75 |
| Snowfall (cm) | — | — | — | 1 | 6 | 28 |
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 (km/h) | 18.5 | 17.2 | 14.5 | 12.5 | 10.0 | 9.5 | 9.8 | 9.8 | 11.2 | 13.5 | 15.0 | 16.7 |
| 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 (km/h) | 18.5 | 17.2 | 14.5 | 12.5 | 10.0 | 9.5 |
| 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 (km/h) | 9.8 | 9.8 | 11.2 | 13.5 | 15.0 | 16.7 |
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.