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Weather & Climate
Sullivan, Indiana, United States
Overview
Climate data and monthly weather averages for Sullivan.
Key Metrics
Annual Avg
12.4°C
Summer Avg
23.8°C
Winter Avg
-0.2°C
Record High
42.4°C
Record Low
-28.8°C
Annual Precipitation
1192.1 mm
Avg Humidity
79%
Summer Humidity
77%
Winter Humidity
84%
Monthly Averages
| Month | High (°C) | Avg (°C) | Low (°C) | Rain (mm) | Humidity (%) | Sunshine (h) | Wind (kph) |
|---|---|---|---|---|---|---|---|
| Jan | 19.8° | -1.5° | -28.8° | 79.4 | 84% | 57 | 62.7 |
| Feb | 22.8° | 0.1° | -23.3° | 68.3 | 83% | 74 | 62.6 |
| Mar | 26.7° | 6.2° | -15.7° | 99.8 | 80% | 114 | 58.9 |
| Apr | 29° | 12.8° | -5.6° | 123.3 | 78% | 146 | 59.2 |
| May | 31.3° | 18.2° | 0.1° | 128.7 | 79% | 171 | 56.3 |
| Jun | 41.2° | 22.9° | 2.9° | 127.2 | 79% | 190 | 48.1 |
| Jul | 42.4° | 24.6° | 9.8° | 113.8 | 78% | 193 | 35.6 |
| Aug | 39.7° | 24° | 9.7° | 78.7 | 74% | 174 | 41 |
| Sep | 35.9° | 20.4° | 3.9° | 83.4 | 72% | 140 | 61.7 |
| Oct | 33.2° | 13.3° | -3.9° | 106 | 73% | 101 | 51.9 |
| Nov | 25.8° | 6.4° | -12.9° | 93.9 | 78% | 67 | 56.8 |
| Dec | 21.8° | 0.9° | -20.1° | 89.6 | 84% | 49 | 59.7 |
Frequently Asked Questions
Sources: NASA POWER · Last updated: 2025
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