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Weymouth, Massachusetts climate
Cfa Humid subtropical
Weymouth has a seasonal cool-temperate climate (Humid subtropical, Köppen Cfa). The hottest month is July with an average daily high near 28°C, while the coldest is January averaging around −6°C at night. Precipitation is fairly even year-round, totalling about 1329 mm. Winters bring significant snowfall (129 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 countsWeymouth climate normals (1991–2020)
| Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Avg high (°C) | 3 | 5 | 8 | 15 | 20 | 25 | 28 | 28 | 23 | 17 | 11 | 6 |
| Avg temp (°C) | −1 | 0 | 3 | 9 | 15 | 20 | 23 | 22 | 18 | 12 | 7 | 2 |
| Avg low (°C) | −6 | −5 | −2 | 4 | 9 | 14 | 17 | 17 | 13 | 7 | 2 | −3 |
| Precipitation (mm) | 114 | 101 | 137 | 118 | 96 | 103 | 90 | 97 | 99 | 133 | 113 | 129 |
| Snowfall (cm) | 38 | 37 | 26 | 4 | — | — | — | — | — | 0 | 2 | 22 |
| Jan – Jun | Jan | Feb | Mar | Apr | May | Jun |
|---|---|---|---|---|---|---|
| Avg high (°C) | 3 | 5 | 8 | 15 | 20 | 25 |
| Avg temp (°C) | −1 | 0 | 3 | 9 | 15 | 20 |
| Avg low (°C) | −6 | −5 | −2 | 4 | 9 | 14 |
| Precipitation (mm) | 114 | 101 | 137 | 118 | 96 | 103 |
| Snowfall (cm) | 38 | 37 | 26 | 4 | — | — |
| Jul – Dec | Jul | Aug | Sep | Oct | Nov | Dec |
|---|---|---|---|---|---|---|
| Avg high (°C) | 28 | 28 | 23 | 17 | 11 | 6 |
| Avg temp (°C) | 23 | 22 | 18 | 12 | 7 | 2 |
| Avg low (°C) | 17 | 17 | 13 | 7 | 2 | −3 |
| Precipitation (mm) | 90 | 97 | 99 | 133 | 113 | 129 |
| Snowfall (cm) | — | — | — | 0 | 2 | 22 |
How often — frequency of weather events
| Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Days with measurable rain (days) | 13 | 11 | 12 | 12 | 13 | 11 | 10 | 9 | 9 | 11 | 11 | 12 |
| Days with high ≥ 32°C (days) | — | — | — | 0.1 | 0.8 | 2 | 6 | 4 | 0.7 | — | — | — |
| Days with low ≤ 0°C (days) | 26 | 24 | 20 | 7 | 0.4 | — | — | — | — | 2 | 13 | 23 |
| Days with snowfall ≥ 2.5 cm (days) | 3 | 3 | 2 | 0.3 | — | — | — | — | — | 0.0 | 0.2 | 2 |
| Jan – Jun | Jan | Feb | Mar | Apr | May | Jun |
|---|---|---|---|---|---|---|
| Days with measurable rain (days) | 13 | 11 | 12 | 12 | 13 | 11 |
| Days with high ≥ 32°C (days) | — | — | — | 0.1 | 0.8 | 2 |
| Days with low ≤ 0°C (days) | 26 | 24 | 20 | 7 | 0.4 | — |
| Days with snowfall ≥ 2.5 cm (days) | 3 | 3 | 2 | 0.3 | — | — |
| Jul – Dec | Jul | Aug | Sep | Oct | Nov | Dec |
|---|---|---|---|---|---|---|
| Days with measurable rain (days) | 10 | 9 | 9 | 11 | 11 | 12 |
| Days with high ≥ 32°C (days) | 6 | 4 | 0.7 | — | — | — |
| Days with low ≤ 0°C (days) | — | — | — | 2 | 13 | 23 |
| Days with snowfall ≥ 2.5 cm (days) | — | — | — | 0.0 | 0.2 | 2 |
Sky & atmosphere
| Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Cloud cover (%) | 69 | 66 | 64 | 62 | 64 | 61 | 55 | 51 | 52 | 57 | 65 | 68 |
| Clear days (≤ 30% cloud) | 3 | 4 | 5 | 6 | 5 | 6 | 7 | 9 | 10 | 8 | 5 | 4 |
| Partly cloudy days (30–70%) | 11 | 10 | 11 | 10 | 11 | 11 | 13 | 12 | 9 | 11 | 10 | 11 |
| Cloudy days (≥ 70%) | 17 | 14 | 15 | 14 | 15 | 13 | 11 | 10 | 11 | 13 | 15 | 16 |
| Relative humidity (%) | 85 | 83 | 82 | 82 | 82 | 82 | 78 | 78 | 78 | 79 | 81 | 83 |
| Wind speed (km/h) | 13.0 | 12.9 | 12.0 | 9.6 | 8.0 | 7.3 | 6.7 | 7.0 | 8.5 | 10.3 | 11.2 | 12.3 |
| Jan – Jun | Jan | Feb | Mar | Apr | May | Jun |
|---|---|---|---|---|---|---|
| Cloud cover (%) | 69 | 66 | 64 | 62 | 64 | 61 |
| Clear days (≤ 30% cloud) | 3 | 4 | 5 | 6 | 5 | 6 |
| Partly cloudy days (30–70%) | 11 | 10 | 11 | 10 | 11 | 11 |
| Cloudy days (≥ 70%) | 17 | 14 | 15 | 14 | 15 | 13 |
| Relative humidity (%) | 85 | 83 | 82 | 82 | 82 | 82 |
| Wind speed (km/h) | 13.0 | 12.9 | 12.0 | 9.6 | 8.0 | 7.3 |
| Jul – Dec | Jul | Aug | Sep | Oct | Nov | Dec |
|---|---|---|---|---|---|---|
| Cloud cover (%) | 55 | 51 | 52 | 57 | 65 | 68 |
| Clear days (≤ 30% cloud) | 7 | 9 | 10 | 8 | 5 | 4 |
| Partly cloudy days (30–70%) | 13 | 12 | 9 | 11 | 10 | 11 |
| Cloudy days (≥ 70%) | 11 | 10 | 11 | 13 | 15 | 16 |
| Relative humidity (%) | 78 | 78 | 78 | 79 | 81 | 83 |
| Wind speed (km/h) | 6.7 | 7.0 | 8.5 | 10.3 | 11.2 | 12.3 |
Methodology & sources
Temperature & precipitation — the official 1991–2020 climate normals from NOAA's U.S. Climate Normals, measured at Hingham (NOAA GHCN station USC00193624), about 2 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.