Climate in Alton, IL, United States
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| Index |  |
|---|---|
| Climate Index: | 73.60 |
Climate By Month in Alton, IL
| Month | Climate Score | Weather Conditions Outline |
| Jan | 8.96 |
Low avg -6℃
|
| Feb | 17.72 |
Low avg -5℃
Chance of snow day 28%
|
| Mar | 67.99 | |
| Apr | 91.20 | |
| May | 99.37 |
Chance of rainy day 43%
|
| Jun | 97.84 |
Chance of humid day 87%
|
| Jul | 95.84 |
Chance of humid day 97%
|
| Aug | 97.01 |
Chance of humid day 92%
|
| Sep | 100.00 | |
| Oct | 93.48 | |
| Nov | 63.05 | |
| Dec | 50.71 |
Low avg -1℃
Chance of cloudy day 48%
|
Best Months To Visit Alton, IL
Best months to visit: April, May, June, July, August, September, October.
Temperatures (table)
| Month | Temp Low Avg | Temp High Avg |
| Jan | -6℃ | 3℃ |
| Feb | -5℃ | 5℃ |
| Mar | 2℃ | 13℃ |
| Apr | 7℃ | 19℃ |
| May | 13℃ | 24℃ |
| Jun | 18℃ | 29℃ |
| Jul | 19℃ | 30℃ |
| Aug | 18℃ | 30℃ |
| Sep | 13℃ | 26℃ |
| Oct | 8℃ | 20℃ |
| Nov | 1℃ | 12℃ |
| Dec | -1℃ | 7℃ |
Nearby Cities:| Climate in Edwardsville, Illinois | 23.62 km |
| Climate in Saint Louis, Missouri | 35.41 km |
| Climate in Collinsville, Illinois | 40.79 km |
| Climate in Saint Charles, Missouri | 43.53 km |
| Climate in O'Fallon, Illinois | 56.83 km |
| Climate in Belleville, Illinois | 58.85 km |
| Climate in Highland, Illinois | 60.67 km |
| Climate in Springfield, Illinois | 143.52 km |
| Climate in Farmington, Missouri | 149.63 km |
| Climate in Havana, Illinois | 180.08 km |
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