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Climate in Iowa
(United States)

Average daytime and nighttime temperatures


All climate 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 of America with an average daily high temperature of only 16 degrees. The climate is varied and offers seasons with strong winters and warm summers.
Overview: Climate in the United States of America
Daylengths and sun positions in the United States of America
Compare climate with other regions or countries
Rain days per month
A rain day is a day on which at least 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 rain days, May offers the most rain days, while January has the fewest.
Precipitation amount in mm/day
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 amount of 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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