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Climate in Iowa
(United States)

Average daytime and nighttime temperatures


All climatic diagrams on this site result from the collected data from ten measuring weather stations in Iowa.
All data correspond to the average monthly values of the last 20 years.


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Iowa is one of the coldest regions in the United States with an average daily high temperature of only 16 degrees centigrade. The climate is very changeable and offers varied seasons with deep winters and warm summers.
Overview: Climate in the United States
Daylengths and sun positions in the United States
Compare climate with other regions or countries
Rainy days per monthRainy days per month in Iowa
A rainy day is a day on which at least an amount of 0.1 mm precipitation (=0.1 liter) per square meter falls. This can be rain, snow, hail or even dew. So it does not have to rain the whole day. With 10 rainy days, May offers the most number of rainy days, and in January the least.
Precipitation in mm/dayPrecipitation in Iowa
The amount of precipitation is measured in millimeters per square meter. Thus, at two mm/day, two liters of water fall on one square meter within 24 hours. With only 0.8 mm, the least rain falls in January. June, on the other hand, has the most rain.
Map of Iowa

Most important cities in the federal state »Iowa«

Alone 3 cities with over 100,000 inhabitants are located here. The federal state has a west-east extension of about 520 km and over 330 km from north to south.

CityPopulationGeo position
Des Moines215,47241° 36' 2"N93° 36' 33"W
Cedar Rapids131,12742° 0' 30"N91° 38' 39"W
Davenport102,61241° 31' 25"N90° 34' 40"W
Sioux City82,68442° 29' 60"N96° 24' 1"W
Waterloo68,40642° 29' 34"N92° 20' 35"W
Iowa City67,86241° 39' 40"N91° 31' 49"W
Council Bluffs62,23041° 15' 43"N95° 51' 39"W
Ames58,96542° 2' 5"N93° 37' 12"W
Dubuque57,63742° 30' 2"N90° 39' 52"W
West Des Moines56,60941° 34' 38"N93° 42' 41"W
Ankeny45,58241° 43' 47"N93° 36' 21"W
Urbandale39,46341° 37' 36"N93° 42' 44"W
Cedar Falls39,26042° 31' 40"N92° 26' 44"W
Marion34,76842° 2' 3"N91° 35' 52"W
Bettendorf33,21741° 31' 28"N90° 30' 56"W
Mason City28,07943° 9' 13"N93° 12' 4"W
Marshalltown27,55242° 2' 58"N92° 54' 29"W
Clinton26,88541° 50' 40"N90° 11' 19"W
Burlington25,66340° 48' 27"N91° 6' 47"W
Fort Dodge25,20642° 29' 51"N94° 10' 5"W
Ottumwa25,02341° 1' 12"N92° 24' 41"W
Muscatine22,88641° 25' 28"N91° 2' 36"W
Coralville18,90741° 40' 35"N91° 34' 50"W
Johnston17,27841° 40' 23"N93° 41' 52"W
Clive15,44741° 36' 11"N93° 43' 27"W
Newton15,25441° 41' 59"N93° 2' 53"W
Indianola14,78241° 21' 29"N93° 33' 27"W
Altoona14,54141° 38' 39"N93° 27' 53"W
Waukee13,79041° 36' 42"N93° 53' 7"W
North Liberty13,37441° 44' 57"N91° 35' 53"W


Data basis: German Weather Service, individual values averaged and supplemented by own elements. Data on cities and inhabitants: geonames.org, United Nations Statistics Division and own research.
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