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Weather & Climate
Grantham, New Hampshire, United States
Overview
Climate data and monthly weather averages for Grantham.
Key Metrics
Annual Avg
6.6°C
Summer Avg
18.9°C
Winter Avg
-6.3°C
Record High
40.4°C
Record Low
-30.5°C
Annual Precipitation
1159 mm
Avg Humidity
84%
Summer Humidity
82%
Winter Humidity
91%
Monthly Averages
| Month | High (°C) | Avg (°C) | Low (°C) | Rain (mm) | Humidity (%) | Sunshine (h) | Wind (kph) |
|---|---|---|---|---|---|---|---|
| Jan | 14.9° | -7.8° | -30.5° | 67.3 | 92% | 50 | 30.9 |
| Feb | 19.1° | -6.8° | -30.1° | 74.8 | 92% | 70 | 36 |
| Mar | 23° | -1.8° | -28.7° | 82.8 | 86% | 114 | 34.2 |
| Apr | 27.6° | 5.4° | -11.7° | 95.7 | 79% | 137 | 30.3 |
| May | 28.5° | 12.1° | -3° | 97.6 | 80% | 162 | 25.3 |
| Jun | 33.6° | 17.1° | 2.1° | 118.2 | 81% | 169 | 22.5 |
| Jul | 40.4° | 20.2° | 8° | 109.1 | 82% | 181 | 16.7 |
| Aug | 32.7° | 19.3° | 5.9° | 102 | 82% | 161 | 24.8 |
| Sep | 32.9° | 15.3° | 0.2° | 92.1 | 81% | 125 | 23.5 |
| Oct | 25.7° | 8.5° | -7.5° | 124.6 | 83% | 80 | 29 |
| Nov | 20.4° | 1.9° | -20.8° | 90 | 85% | 52 | 26.9 |
| Dec | 17.5° | -4.2° | -27.3° | 104.8 | 90% | 38 | 29.7 |
Frequently Asked Questions
Sources: NASA POWER · Last updated: 2025
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