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Weather & Climate
Saint Mary's County, Maryland, United States
Overview
Climate data and monthly weather averages for Saint Mary's County.
Key Metrics
Annual Avg
14.8°C
Summer Avg
25.3°C
Winter Avg
4.1°C
Record High
36°C
Record Low
-11.9°C
Annual Precipitation
1181.2 mm
Avg Humidity
78%
Summer Humidity
74%
Winter Humidity
80%
Monthly Averages
| Month | High (°C) | Avg (°C) | Low (°C) | Rain (mm) | Humidity (%) | Sunshine (h) | Wind (kph) |
|---|---|---|---|---|---|---|---|
| Jan | 18.7° | 2.9° | -10.2° | 72.2 | 80% | 68 | 61.7 |
| Feb | 18.3° | 3.6° | -11.9° | 68.6 | 80% | 85 | 56.9 |
| Mar | 22.9° | 7.2° | -7.1° | 86.2 | 79% | 125 | 62.8 |
| Apr | 27.8° | 13° | 0.9° | 87 | 78% | 154 | 61.4 |
| May | 31.5° | 18.3° | 5.2° | 103.5 | 79% | 180 | 53.5 |
| Jun | 34.1° | 23.6° | 12.2° | 111.6 | 76% | 193 | 41.9 |
| Jul | 36° | 26.5° | 18.3° | 119 | 73% | 196 | 43.3 |
| Aug | 35.8° | 25.9° | 17.9° | 132.7 | 74% | 173 | 68.5 |
| Sep | 32.5° | 22.8° | 12.9° | 114.9 | 76% | 136 | 76.7 |
| Oct | 32.3° | 16.9° | 5.1° | 109.7 | 77% | 105 | 65.4 |
| Nov | 22.6° | 10.7° | -1.6° | 81.6 | 78% | 75 | 54.9 |
| Dec | 21.1° | 5.9° | -7.5° | 94.2 | 81% | 60 | 55.8 |
Frequently Asked Questions
Sources: NASA POWER · Last updated: 2025
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