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Weather & Climate
Walnut, Illinois, United States
Overview
Climate data and monthly weather averages for Walnut.
Key Metrics
Annual Avg
9.9°C
Summer Avg
22.6°C
Winter Avg
-3.9°C
Record High
42°C
Record Low
-37.9°C
Annual Precipitation
961.6 mm
Avg Humidity
78%
Summer Humidity
75%
Winter Humidity
85%
Monthly Averages
| Month | High (°C) | Avg (°C) | Low (°C) | Rain (mm) | Humidity (%) | Sunshine (h) | Wind (kph) |
|---|---|---|---|---|---|---|---|
| Jan | 16.4° | -5.4° | -37.9° | 44.3 | 86% | 56 | 57.8 |
| Feb | 19.4° | -3.7° | -27.9° | 48.2 | 83% | 77 | 63.9 |
| Mar | 26.4° | 3.1° | -23.6° | 63.2 | 78% | 115 | 64.6 |
| Apr | 29.1° | 10° | -7.5° | 95.1 | 74% | 143 | 60.6 |
| May | 33.7° | 16.1° | -2.6° | 118.1 | 76% | 171 | 60.7 |
| Jun | 39.2° | 21.5° | 4.6° | 114.9 | 76% | 186 | 52.2 |
| Jul | 42° | 23.6° | 8.4° | 97.3 | 75% | 195 | 41.8 |
| Aug | 39.3° | 22.8° | 7.5° | 100.1 | 73% | 170 | 33.4 |
| Sep | 36.3° | 18.7° | 1.4° | 86.4 | 73% | 136 | 45.6 |
| Oct | 31.2° | 11° | -8.8° | 81.2 | 74% | 94 | 53.3 |
| Nov | 23.9° | 4° | -13.9° | 57.6 | 79% | 61 | 59.8 |
| Dec | 20.7° | -2.5° | -25.5° | 55.2 | 86% | 47 | 65.8 |
Frequently Asked Questions
Sources: NASA POWER · Last updated: 2025
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