Climate in Alton, IL, United States

Index
Climate Index:	73.60

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Climate By Month in Alton, IL

Month	Climate Score	Weather Conditions Outline
Jan	8.96	Low avg 21℉
Feb	17.72	Low avg 23℉ 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 30℉ 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	21℉	37℉
Feb	23℉	41℉
Mar	36℉	55℉
Apr	45℉	66℉
May	55℉	75℉
Jun	64℉	84℉
Jul	66℉	86℉
Aug	64℉	86℉
Sep	55℉	79℉
Oct	46℉	68℉
Nov	34℉	54℉
Dec	30℉	45℉