Weather & Climate at Camp Dodge Army Base

Johnston, IA

Summary of the weather and climate in Johnston, IA:

The average high is 59.7°F and the average low is 39.9°F.
The hottest month is July with a high of 85°F.
The coldest month is January with a low of 12.2°F.
Annual rainfall is 35.61 inches; the rainiest month is June (5.3 in).
Annual snowfall is 39.3 inches; the snowiest month is January (10.5 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).

Monthly averages

Month	High (°F)	Low (°F)	Rain (in)	Snow (in)
January	30.2	12.2	0.98	10.5
February	35.5	16.9	1.19	9.6
March	48.8	27.7	2.21	6.1
April	62	39.7	3.71	1.9
May	72	51.1	4.46	0
June	80.5	60.6	5.3	0
July	85	64.8	4.78	0
August	83.2	63.4	4.04	0
September	75.9	54.3	3.15	0
October	62.7	41.7	2.54	0.6
November	47.1	29.2	1.94	2
December	33	16.6	1.31	8.6