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Weather & Climate
Chatham, Massachusetts, United States
Overview
Climate data and monthly weather averages for Chatham.
Key Metrics
Annual Avg
10.8°C
Summer Avg
19°C
Winter Avg
3°C
Record High
27.9°C
Record Low
-14.9°C
Annual Precipitation
1123.9 mm
Avg Humidity
84%
Summer Humidity
89%
Winter Humidity
80%
Monthly Averages
| Month | High (°C) | Avg (°C) | Low (°C) | Rain (mm) | Humidity (%) | Sunshine (h) | Wind (kph) |
|---|---|---|---|---|---|---|---|
| Jan | 13° | 2.1° | -14.9° | 90.8 | 81% | 50 | 92.2 |
| Feb | 12.3° | 1.8° | -14.8° | 86 | 80% | 71 | 97.5 |
| Mar | 13.4° | 3.4° | -9.6° | 106 | 81% | 113 | 91.2 |
| Apr | 20.9° | 6.9° | -0.2° | 96.9 | 85% | 146 | 90.3 |
| May | 20.9° | 11° | 4.7° | 86.2 | 89% | 171 | 67.4 |
| Jun | 25.5° | 15.8° | 9.3° | 84 | 90% | 176 | 57.7 |
| Jul | 27.9° | 20.2° | 14.6° | 71.6 | 89% | 185 | 63.3 |
| Aug | 26.8° | 21° | 15.8° | 74.1 | 87% | 167 | 82 |
| Sep | 23.9° | 18.5° | 12.2° | 94.8 | 84% | 133 | 76.2 |
| Oct | 22.5° | 14.2° | 5.1° | 113.8 | 80% | 93 | 92.3 |
| Nov | 18.1° | 9.4° | -4.1° | 105.9 | 80% | 58 | 105.3 |
| Dec | 16.4° | 5.2° | -8.7° | 113.8 | 80% | 43 | 83.2 |
Frequently Asked Questions
Sources: NASA POWER · Last updated: 2025
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