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Nantucket, Massachusetts climate
Cfb Oceanic / temperate
Nantucket has a seasonal cool-temperate climate (Oceanic / temperate, Köppen Cfb). The hottest month is July with an average daily high near 26°C, while the coldest is January averaging around −5°C at night. Precipitation is fairly even year-round, totalling about 1160 mm. Light snow accumulates each winter (55 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 countsNantucket climate normals (1991–2020)
| Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Avg high (°C) | 4 | 4 | 7 | 12 | 17 | 22 | 26 | 25 | 22 | 16 | 11 | 7 |
| Avg temp (°C) | −1 | 0 | 3 | 8 | 13 | 18 | 22 | 21 | 18 | 12 | 7 | 2 |
| Avg low (°C) | −5 | −5 | −1 | 4 | 9 | 14 | 18 | 17 | 14 | 8 | 3 | −2 |
| Precipitation (mm) | 94 | 90 | 121 | 102 | 87 | 85 | 70 | 82 | 97 | 109 | 103 | 119 |
| Snowfall (cm) | 24 | 16 | 9 | — | — | — | — | — | — | — | — | 5 |
| Jan – Jun | Jan | Feb | Mar | Apr | May | Jun |
|---|---|---|---|---|---|---|
| Avg high (°C) | 4 | 4 | 7 | 12 | 17 | 22 |
| Avg temp (°C) | −1 | 0 | 3 | 8 | 13 | 18 |
| Avg low (°C) | −5 | −5 | −1 | 4 | 9 | 14 |
| Precipitation (mm) | 94 | 90 | 121 | 102 | 87 | 85 |
| Snowfall (cm) | 24 | 16 | 9 | — | — | — |
| Jul – Dec | Jul | Aug | Sep | Oct | Nov | Dec |
|---|---|---|---|---|---|---|
| Avg high (°C) | 26 | 25 | 22 | 16 | 11 | 7 |
| Avg temp (°C) | 22 | 21 | 18 | 12 | 7 | 2 |
| Avg low (°C) | 18 | 17 | 14 | 8 | 3 | −2 |
| Precipitation (mm) | 70 | 82 | 97 | 109 | 103 | 119 |
| Snowfall (cm) | — | — | — | — | — | 5 |
How often — frequency of weather events
| Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Days with measurable rain (days) | 9 | 9 | 10 | 10 | 10 | 9 | 6 | 8 | 7 | 10 | 10 | 10 |
| Days with high ≥ 32°C (days) | — | — | — | — | 0.0 | 0.2 | 1 | 0.2 | 0.1 | — | — | — |
| Days with low ≤ 0°C (days) | 22 | 21 | 17 | 4 | 0.1 | — | — | — | — | 1 | 8 | 18 |
| Days with snowfall ≥ 2.5 cm (days) | 1 | 1 | 1 | 0.1 | — | — | — | — | — | — | 0.0 | 0.6 |
| Jan – Jun | Jan | Feb | Mar | Apr | May | Jun |
|---|---|---|---|---|---|---|
| Days with measurable rain (days) | 9 | 9 | 10 | 10 | 10 | 9 |
| Days with high ≥ 32°C (days) | — | — | — | — | 0.0 | 0.2 |
| Days with low ≤ 0°C (days) | 22 | 21 | 17 | 4 | 0.1 | — |
| Days with snowfall ≥ 2.5 cm (days) | 1 | 1 | 1 | 0.1 | — | — |
| Jul – Dec | Jul | Aug | Sep | Oct | Nov | Dec |
|---|---|---|---|---|---|---|
| Days with measurable rain (days) | 6 | 8 | 7 | 10 | 10 | 10 |
| Days with high ≥ 32°C (days) | 1 | 0.2 | 0.1 | — | — | — |
| Days with low ≤ 0°C (days) | — | — | — | 1 | 8 | 18 |
| Days with snowfall ≥ 2.5 cm (days) | — | — | — | — | 0.0 | 0.6 |
Sky & atmosphere
| Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Cloud cover (%) | 69 | 66 | 63 | 62 | 63 | 61 | 56 | 53 | 53 | 57 | 63 | 67 |
| Clear days (≤ 30% cloud) | 3 | 4 | 5 | 6 | 5 | 6 | 7 | 9 | 9 | 8 | 5 | 4 |
| Partly cloudy days (30–70%) | 12 | 10 | 11 | 11 | 12 | 11 | 12 | 12 | 10 | 10 | 10 | 12 |
| Cloudy days (≥ 70%) | 16 | 14 | 15 | 14 | 14 | 13 | 12 | 10 | 11 | 13 | 15 | 16 |
| Relative humidity (%) | 81 | 80 | 81 | 85 | 89 | 89 | 89 | 87 | 83 | 80 | 79 | 80 |
| Wind speed (m/s) | 7.3 | 7.0 | 6.7 | 5.9 | 5.1 | 4.8 | 4.5 | 4.5 | 5.2 | 6.2 | 6.6 | 7.1 |
| Jan – Jun | Jan | Feb | Mar | Apr | May | Jun |
|---|---|---|---|---|---|---|
| Cloud cover (%) | 69 | 66 | 63 | 62 | 63 | 61 |
| Clear days (≤ 30% cloud) | 3 | 4 | 5 | 6 | 5 | 6 |
| Partly cloudy days (30–70%) | 12 | 10 | 11 | 11 | 12 | 11 |
| Cloudy days (≥ 70%) | 16 | 14 | 15 | 14 | 14 | 13 |
| Relative humidity (%) | 81 | 80 | 81 | 85 | 89 | 89 |
| Wind speed (m/s) | 7.3 | 7.0 | 6.7 | 5.9 | 5.1 | 4.8 |
| Jul – Dec | Jul | Aug | Sep | Oct | Nov | Dec |
|---|---|---|---|---|---|---|
| Cloud cover (%) | 56 | 53 | 53 | 57 | 63 | 67 |
| Clear days (≤ 30% cloud) | 7 | 9 | 9 | 8 | 5 | 4 |
| Partly cloudy days (30–70%) | 12 | 12 | 10 | 10 | 10 | 12 |
| Cloudy days (≥ 70%) | 12 | 10 | 11 | 13 | 15 | 16 |
| Relative humidity (%) | 89 | 87 | 83 | 80 | 79 | 80 |
| Wind speed (m/s) | 4.5 | 4.5 | 5.2 | 6.2 | 6.6 | 7.1 |
Methodology & sources
Temperature & precipitation — the official 1991–2020 climate normals from NOAA's U.S. Climate Normals, measured at Hyannis (NOAA GHCN station USC00193821), about 46 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.