Weather & Climate at Rock Island Arsenal Army Base

Arsenal Island, IL

Summary of the weather and climate in Arsenal Island, IL:

The average high is 60.6°F and the average low is 40.7°F.
The hottest month is July with a high of 85.8°F.
The coldest month is January with a low of 14.3°F.
Annual rainfall is 37.96 inches; the rainiest month is August (4.52 in).
Annual snowfall is 31.6 inches; the snowiest month is January (9.4 in).

Source: NOAA climate normals.

Temperatures through the year

Jan

Feb

Mar

Apr

May

Jun

Jul

Aug

Sep

Oct

Nov

Dec

Bars span each month's average low to average high (10°F – 90°F scale).

Month	High (°F)	Low (°F)	Rain (in)	Snow (in)
January	31	14.3	1.49	9.4
February	35.7	18.3	1.6	6.8
March	48.8	29.4	2.86	4
April	62.3	40.5	3.59	0.9
May	72.9	50.7	4.32	0
June	82.3	60.7	4.49	0
July	85.8	65	4.29	0
August	83.8	63.2	4.52	0
September	76.8	53.9	3.09	0
October	64.1	42.4	2.97	0
November	49.2	30.9	2.56	1.2
December	34.6	18.6	2.18	9.3

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