Weather Averages for Alton, IL

7-day Forecast / 10-day Forecast

Latitude: 38°52'N, Longitude: 90°10'W, Elevation: 430.0 ft, Distance: 5.54 mi Alton, IL Averages »

	Unit	Year	Jan	Feb	Mar	Apr	May	Jun	Jul	Aug	Sep	Oct	Nov	Dec
Average temperature over 30 years	°F	54	26	31	42	54	64	74	78	76	68	56	44	32
Average high temperature over 30 years	°F	64	36	40	52	64	74	84	88	86	79	67	53	40
Average low temperature over 30 years	°F	44	17	21	32	44	54	64	68	66	57	46	35	23
Highest recorded temperature over 49 years	°F	111	71	75	84	91	98	107	111	105	102	93	84	73
Lowest recorded temperature over 49 years	°F	-16	-16	-14	0	19	32	44	50	46	37	24	3	-16
Average number of days above 90°F over 30 years	days	37	-	-	-	0.1	1.1	7.3	14	10	3.4	0.2	-	-
Average precipitation over 30 years	in	38.4	1.9	2.1	3.6	3.7	4.3	3.3	3.7	3.3	3.1	2.8	3.4	3.2
Average number of days below 32°F over 30 years	days	103	27	22	16	2.2	-	-	-	-	-	1.3	12	23
Average number of days below 0°F over 30 years	days	3.4	1.8	0.8	-	-	-	-	-	-	-	-	-	0.7
Average snowfall over 30 years	in	11.9	4.4	4.3	2.9	0.4	-	-	-	-	-	-	0.5	1.5
Most rain reported in a day over 54 years	in	7.7	3.6	2.3	4.1	7.7	4.7	3.4	4.7	4.3	3.5	3.5	5.4	2.7
Most rain reported in a month over 54 years	in	53.7	7.8	5.7	8.1	17.5	10.2	10.8	9.6	14.8	11.5	7.1	12.8	8.2
Least rain reported in a month over 54 years	in	19.1	0.1	-	0.9	0.8	1.0	0.4	0.3	0.5	0.3	0.3	0.2	0.2
Heating degree days over 30 years	days	5189	1174	957	691	323	101	6	1	2	48	277	604	1005
Cooling degree days over 30 years	days	1343	-	-	2	19	96	279	415	344	163	25	-	-
Most snow reported in a month over 54 years	in	45.6	18.8	19.5	24.6	5.5	-	-	-	-	-	-	9.8	8.7

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