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Iowa City, IA weather and climate

Johnson County, IA · population 75,264 · about 666 ft elevation

Everything below is a 30 year average for 1991-2020, computed from daily climate history at Iowa City's own coordinates.

The year at a glance

Sunny days
195
clear or partly cloudy, per year
Precipitation
39 in
per year
Wet days
118
rain or snow per year
Snowfall
28 in
per year
Hot days
19
above 90 °F
Freezing nights
133
at or below 32 °F
Humidity
71%
average relative
Average temperature
51 °F
year round

Monthly temperatures

Average daily high and low for each month, in °F.

Daily highDaily low
255075JanMarMayJulSepNovDaily high, Jan: 31 °FDaily high, Feb: 35 °FDaily high, Mar: 49 °FDaily high, Apr: 62 °FDaily high, May: 73 °FDaily high, Jun: 82 °FDaily high, Jul: 86 °FDaily high, Aug: 84 °FDaily high, Sep: 77 °FDaily high, Oct: 64 °FDaily high, Nov: 49 °FDaily high, Dec: 36 °FDaily low, Jan: 14 °FDaily low, Feb: 18 °FDaily low, Mar: 29 °FDaily low, Apr: 40 °FDaily low, May: 51 °FDaily low, Jun: 62 °FDaily low, Jul: 65 °FDaily low, Aug: 63 °FDaily low, Sep: 54 °FDaily low, Oct: 42 °FDaily low, Nov: 30 °FDaily low, Dec: 20 °F
View monthly temperatures as a table
Monthly temperatures (°F)
CityJanFebMarAprMayJunJulAugSepOctNovDec
Daily high313549627382868477644936
Daily low141829405162656354423020

Monthly precipitation

Total rain plus melted snow for each month, in inches.

0.02.04.0JanMarMayJulSepNovIowa City, Jan: 1.5 inIowa City, Feb: 1.8 inIowa City, Mar: 2.7 inIowa City, Apr: 4.4 inIowa City, May: 4.8 inIowa City, Jun: 5.1 inIowa City, Jul: 3.7 inIowa City, Aug: 3.8 inIowa City, Sep: 3.9 inIowa City, Oct: 2.9 inIowa City, Nov: 2.3 inIowa City, Dec: 1.9 in
View monthly precipitation as a table
Monthly precipitation (inches)
CityJanFebMarAprMayJunJulAugSepOctNovDec
Iowa City1.51.82.74.44.85.13.73.83.92.92.31.9

Monthly sunny days

Days each month with clear or partly cloudy skies.

01020JanMarMayJulSepNovIowa City, Jan: 13 daysIowa City, Feb: 13 daysIowa City, Mar: 16 daysIowa City, Apr: 14 daysIowa City, May: 15 daysIowa City, Jun: 16 daysIowa City, Jul: 21 daysIowa City, Aug: 21 daysIowa City, Sep: 21 daysIowa City, Oct: 18 daysIowa City, Nov: 15 daysIowa City, Dec: 13 days
View monthly sunny days as a table
Monthly sunny days (days)
CityJanFebMarAprMayJunJulAugSepOctNovDec
Iowa City131316141516212121181513

Compare Iowa City with another city

Nearby cities and popular picks. Any two cities can be compared from the home page.

See weather for every covered Iowa city

About this data

Figures are 30 year averages for 1991-2020. Wet days count days with measurable precipitation, calibrated against the wet day counts in NOAA's published climate normals. Sunny days count clear plus partly cloudy days, defined as average cloud cover of 63 percent or less and calibrated against NOAA's published sky cover tables. Snowfall figures are model estimates anchored to NOAA station measurements near each city.

Weather data by Open-Meteo.com (CC BY 4.0). Contains modified Copernicus Climate Change Service information (ERA5, ERA5-Land).