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Yarmouth, Massachusetts climate
Cfb Oceanic / temperate
Yarmouth has a seasonal cool-temperate climate (Oceanic / temperate, Köppen Cfb). The hottest month is July with an average daily high near 78°F, while the coldest is January averaging around 22°F at night. Precipitation is fairly even year-round, totalling about 46 inches. Light snow accumulates each winter (22 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 figuresClear vs cloudy days
Share of days each month that are clear, partly cloudy or cloudy · 1991–2020 · hover a month for the day countsYarmouth climate normals (1991–2020)
| Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Avg high (°F) | 39 | 40 | 44 | 54 | 63 | 72 | 78 | 77 | 71 | 61 | 52 | 44 |
| Avg temp (°F) | 31 | 32 | 37 | 46 | 55 | 64 | 71 | 70 | 64 | 54 | 45 | 36 |
| Avg low (°F) | 22 | 24 | 30 | 38 | 48 | 57 | 64 | 63 | 57 | 46 | 37 | 29 |
| Precipitation (in) | 3.7 | 3.6 | 4.8 | 4.0 | 3.4 | 3.3 | 2.8 | 3.2 | 3.8 | 4.3 | 4.1 | 4.7 |
| Snowfall (in) | 9.5 | 6.3 | 3.6 | — | — | — | — | — | — | — | — | 2.1 |
| Jan – Jun | Jan | Feb | Mar | Apr | May | Jun |
|---|---|---|---|---|---|---|
| Avg high (°F) | 39 | 40 | 44 | 54 | 63 | 72 |
| Avg temp (°F) | 31 | 32 | 37 | 46 | 55 | 64 |
| Avg low (°F) | 22 | 24 | 30 | 38 | 48 | 57 |
| Precipitation (in) | 3.7 | 3.6 | 4.8 | 4.0 | 3.4 | 3.3 |
| Snowfall (in) | 9.5 | 6.3 | 3.6 | — | — | — |
| Jul – Dec | Jul | Aug | Sep | Oct | Nov | Dec |
|---|---|---|---|---|---|---|
| Avg high (°F) | 78 | 77 | 71 | 61 | 52 | 44 |
| Avg temp (°F) | 71 | 70 | 64 | 54 | 45 | 36 |
| Avg low (°F) | 64 | 63 | 57 | 46 | 37 | 29 |
| Precipitation (in) | 2.8 | 3.2 | 3.8 | 4.3 | 4.1 | 4.7 |
| Snowfall (in) | — | — | — | — | — | 2.1 |
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 ≥ 90°F (days) | — | — | — | — | 0.0 | 0.2 | 1 | 0.2 | 0.1 | — | — | — |
| Days with low ≤ 32°F (days) | 22 | 21 | 17 | 4 | 0.1 | — | — | — | — | 1 | 8 | 18 |
| Days with snowfall ≥ 1 in (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 ≥ 90°F (days) | — | — | — | — | 0.0 | 0.2 |
| Days with low ≤ 32°F (days) | 22 | 21 | 17 | 4 | 0.1 | — |
| Days with snowfall ≥ 1 in (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 ≥ 90°F (days) | 1 | 0.2 | 0.1 | — | — | — |
| Days with low ≤ 32°F (days) | — | — | — | 1 | 8 | 18 |
| Days with snowfall ≥ 1 in (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 (mph) | 16.4 | 15.7 | 14.9 | 13.1 | 11.5 | 10.8 | 10.1 | 10.1 | 11.7 | 13.8 | 14.8 | 15.9 |
| 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 (mph) | 16.4 | 15.7 | 14.9 | 13.1 | 11.5 | 10.8 |
| 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 (mph) | 10.1 | 10.1 | 11.7 | 13.8 | 14.8 | 15.9 |
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 8 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.