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Weather & Climate
Saint Clair County, Missouri, United States
Overview
Climate data and monthly weather averages for Saint Clair County.
Key Metrics
Annual Avg
13.4°C
Summer Avg
25.5°C
Winter Avg
0.6°C
Record High
44.3°C
Record Low
-26.4°C
Annual Precipitation
1144.2 mm
Avg Humidity
76%
Summer Humidity
72%
Winter Humidity
81%
Monthly Averages
| Month | High (°C) | Avg (°C) | Low (°C) | Rain (mm) | Humidity (%) | Sunshine (h) | Wind (kph) |
|---|---|---|---|---|---|---|---|
| Jan | 22.1° | -0.8° | -26.4° | 51.1 | 81% | 69 | 51.4 |
| Feb | 24.1° | 1.1° | -24.2° | 57.1 | 80% | 83 | 54 |
| Mar | 28.2° | 7.6° | -16.8° | 90.2 | 78% | 120 | 48.6 |
| Apr | 34.5° | 13.6° | -6.4° | 124.2 | 75% | 150 | 46.1 |
| May | 32.6° | 18.8° | -0.1° | 152.2 | 78% | 177 | 42.6 |
| Jun | 39.3° | 24° | 8.6° | 130.8 | 77% | 197 | 37.6 |
| Jul | 41.7° | 26.6° | 12.5° | 104.8 | 70% | 201 | 27.1 |
| Aug | 44.3° | 25.9° | 10.3° | 112.2 | 69% | 176 | 29.9 |
| Sep | 39.8° | 21.3° | 4.6° | 93.6 | 71% | 145 | 42.2 |
| Oct | 32.5° | 13.9° | -7.8° | 98.3 | 72% | 108 | 38.4 |
| Nov | 26.7° | 7.4° | -13.1° | 70.5 | 77% | 73 | 46.6 |
| Dec | 21.4° | 1.4° | -21.6° | 59.2 | 82% | 60 | 48.6 |
Frequently Asked Questions
Sources: NASA POWER · Last updated: 2025
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