Decorah (IA) Weather & Climate: Best Time to Visit

Depending on the time of the year, temperatures range from comfortable to very cold in Decorah. On average, daytime temperatures range from a comfortable 28°C (82°F) in July to a very cold -3°C (27°F) in January.

Nighttime temperatures range from 16°C (61°F) in July to -13°C (9°F) in January.

Check out our detailed temperature page for more information.

Temperature ranges by month

Generally, Decorah has a moderate amount of precipitation, averaging 984 mm (39 in) of rain/snowfall annually. The seasons in Decorah bring significant changes in precipitation. The wettest month, June, receives heavy rainfall, with an average of 167 mm (6.6 in) of precipitation. This rainfall is distributed across 12 rainy days.

In contrast, the driest month, January, experiences much less snowfall, totaling 20 mm (0.8 in) over 6 snowy days. These distinct seasonal differences provide diverse experiences throughout the year. For more details, please visit our Decorah Precipitation page.

The mean monthly precipitation over the year, including rain, hail, and snow

The average number of days each month with precipitation

The relative humidity is high throughout the year in Decorah.

The city experiences its highest humidity in September, reaching 76%. In April, the humidity drops to its lowest level at 63%. What does this mean? Read our detailed page on humidity levels for further details.

Relative humidity over the year