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Rochester, New York climate
Dfa Hot-summer humid continental
Rochester has a strongly seasonal cool-temperate climate (Hot-summer humid continental, Köppen Dfa). The hottest month is July with an average daily high near 28°C, while the coldest is January averaging around −7°C at night. Precipitation is fairly even year-round, totalling about 891 mm. Snowfall is heavy (259 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 countsRochester climate normals (1991–2020)
| Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Avg high (°C) | 1 | 2 | 6 | 14 | 21 | 26 | 28 | 27 | 23 | 16 | 10 | 4 |
| Avg temp (°C) | −3 | −3 | 2 | 8 | 15 | 20 | 22 | 22 | 18 | 11 | 5 | 0 |
| Avg low (°C) | −7 | −7 | −3 | 3 | 9 | 14 | 17 | 16 | 12 | 6 | 1 | −4 |
| Precipitation (mm) | 65 | 54 | 63 | 76 | 73 | 86 | 90 | 84 | 81 | 82 | 70 | 68 |
| Snowfall (cm) | 70 | 59 | 45 | 8 | 0 | — | — | — | — | 0 | 21 | 57 |
| Jan – Jun | Jan | Feb | Mar | Apr | May | Jun |
|---|---|---|---|---|---|---|
| Avg high (°C) | 1 | 2 | 6 | 14 | 21 | 26 |
| Avg temp (°C) | −3 | −3 | 2 | 8 | 15 | 20 |
| Avg low (°C) | −7 | −7 | −3 | 3 | 9 | 14 |
| Precipitation (mm) | 65 | 54 | 63 | 76 | 73 | 86 |
| Snowfall (cm) | 70 | 59 | 45 | 8 | 0 | — |
| Jul – Dec | Jul | Aug | Sep | Oct | Nov | Dec |
|---|---|---|---|---|---|---|
| Avg high (°C) | 28 | 27 | 23 | 16 | 10 | 4 |
| Avg temp (°C) | 22 | 22 | 18 | 11 | 5 | 0 |
| Avg low (°C) | 17 | 16 | 12 | 6 | 1 | −4 |
| Precipitation (mm) | 90 | 84 | 81 | 82 | 70 | 68 |
| Snowfall (cm) | — | — | — | 0 | 21 | 57 |
How often — frequency of weather events
| Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Days with measurable rain (days) | 20 | 16 | 15 | 13 | 12 | 12 | 11 | 10 | 11 | 14 | 15 | 18 |
| Days with high ≥ 32°C (days) | — | — | — | — | 0.4 | 2 | 4 | 2 | 0.9 | — | — | — |
| Days with low ≤ 0°C (days) | 27 | 26 | 23 | 10 | 0.6 | — | — | — | 0.1 | 3 | 15 | 25 |
| Days with snowfall ≥ 2.5 cm (days) | 8 | 7 | 4 | 1.0 | 0.0 | — | — | — | — | 0.0 | 2 | 6 |
| Jan – Jun | Jan | Feb | Mar | Apr | May | Jun |
|---|---|---|---|---|---|---|
| Days with measurable rain (days) | 20 | 16 | 15 | 13 | 12 | 12 |
| Days with high ≥ 32°C (days) | — | — | — | — | 0.4 | 2 |
| Days with low ≤ 0°C (days) | 27 | 26 | 23 | 10 | 0.6 | — |
| Days with snowfall ≥ 2.5 cm (days) | 8 | 7 | 4 | 1.0 | 0.0 | — |
| Jul – Dec | Jul | Aug | Sep | Oct | Nov | Dec |
|---|---|---|---|---|---|---|
| Days with measurable rain (days) | 11 | 10 | 11 | 14 | 15 | 18 |
| Days with high ≥ 32°C (days) | 4 | 2 | 0.9 | — | — | — |
| Days with low ≤ 0°C (days) | — | — | 0.1 | 3 | 15 | 25 |
| Days with snowfall ≥ 2.5 cm (days) | — | — | — | 0.0 | 2 | 6 |
Sky & atmosphere
| Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Cloud cover (%) | 82 | 77 | 76 | 80 | 81 | 77 | 72 | 69 | 67 | 71 | 77 | 82 |
| Clear days (≤ 30% cloud) | 0.6 | 2 | 2 | 2 | 1 | 2 | 3 | 3 | 5 | 4 | 2 | 0.5 |
| Partly cloudy days (30–70%) | 6 | 7 | 9 | 6 | 7 | 7 | 10 | 11 | 9 | 7 | 8 | 6 |
| Cloudy days (≥ 70%) | 25 | 20 | 21 | 22 | 23 | 21 | 19 | 17 | 16 | 19 | 21 | 24 |
| Relative humidity (%) | 90 | 88 | 84 | 78 | 75 | 73 | 70 | 70 | 71 | 77 | 83 | 88 |
| Wind speed (m/s) | 1.6 | 1.7 | 1.2 | 0.7 | 0.4 | 0.4 | 0.4 | 0.4 | 0.5 | 0.5 | 0.7 | 1.1 |
| Jan – Jun | Jan | Feb | Mar | Apr | May | Jun |
|---|---|---|---|---|---|---|
| Cloud cover (%) | 82 | 77 | 76 | 80 | 81 | 77 |
| Clear days (≤ 30% cloud) | 0.6 | 2 | 2 | 2 | 1 | 2 |
| Partly cloudy days (30–70%) | 6 | 7 | 9 | 6 | 7 | 7 |
| Cloudy days (≥ 70%) | 25 | 20 | 21 | 22 | 23 | 21 |
| Relative humidity (%) | 90 | 88 | 84 | 78 | 75 | 73 |
| Wind speed (m/s) | 1.6 | 1.7 | 1.2 | 0.7 | 0.4 | 0.4 |
| Jul – Dec | Jul | Aug | Sep | Oct | Nov | Dec |
|---|---|---|---|---|---|---|
| Cloud cover (%) | 72 | 69 | 67 | 71 | 77 | 82 |
| Clear days (≤ 30% cloud) | 3 | 3 | 5 | 4 | 2 | 0.5 |
| Partly cloudy days (30–70%) | 10 | 11 | 9 | 7 | 8 | 6 |
| Cloudy days (≥ 70%) | 19 | 17 | 16 | 19 | 21 | 24 |
| Relative humidity (%) | 70 | 70 | 71 | 77 | 83 | 88 |
| Wind speed (m/s) | 0.4 | 0.4 | 0.5 | 0.5 | 0.7 | 1.1 |
Methodology & sources
Temperature & precipitation — the official 1991–2020 climate normals from NOAA's U.S. Climate Normals, measured at Rochester Gtr Intl (NOAA GHCN station USW00014768), about 6 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.