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Weather & Climate
Alton, Missouri, United States
Overview
Climate data and monthly weather averages for Alton.
Key Metrics
Annual Avg
14.4°C
Summer Avg
25.4°C
Winter Avg
2.7°C
Record High
43.9°C
Record Low
-19.6°C
Annual Precipitation
1249.1 mm
Avg Humidity
78%
Summer Humidity
75%
Winter Humidity
82%
Monthly Averages
| Month | High (°C) | Avg (°C) | Low (°C) | Rain (mm) | Humidity (%) | Sunshine (h) | Wind (kph) |
|---|---|---|---|---|---|---|---|
| Jan | 22.3° | 1.5° | -15.9° | 76.6 | 82% | 75 | 35.5 |
| Feb | 24.7° | 3.3° | -19.6° | 91 | 81% | 85 | 30.6 |
| Mar | 28.3° | 9° | -11.7° | 123.4 | 80% | 127 | 30.4 |
| Apr | 31.3° | 14.7° | -5.8° | 135.9 | 78% | 157 | 25.5 |
| May | 34.5° | 19.5° | 0.7° | 140.1 | 80% | 180 | 22 |
| Jun | 41.7° | 24.2° | 9.2° | 84.6 | 78% | 199 | 21.7 |
| Jul | 41.6° | 26.3° | 13.1° | 100.1 | 75% | 198 | 17.5 |
| Aug | 43.9° | 25.8° | 10.1° | 101.7 | 72% | 177 | 19.8 |
| Sep | 37.3° | 21.8° | 4.2° | 86.7 | 71% | 147 | 31.4 |
| Oct | 34° | 14.9° | -3.5° | 102.9 | 73% | 113 | 23.8 |
| Nov | 28.5° | 8.5° | -9.2° | 104.7 | 77% | 80 | 26.9 |
| Dec | 22.6° | 3.2° | -14.5° | 101.4 | 83% | 65 | 29.4 |
Frequently Asked Questions
Sources: NASA POWER · Last updated: 2025
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