Humidity Levels in Iowa During January

The average humidity in January is listed below for places in Iowa. The tables give daily averages along with highest and lowest relative humidity levels.

Relative humidity measures the actual amount of moisture in the air as a percentage of the maximum amount of moisture the air can hold.

All the numbers here are averages for the years 1961 to 1990.

Average Humidity

In this table, the Daily number is the average of humidity readings taken every three hours throughout the day. Morning percentages are for 6 am and Afternoon measures are for 3 pm local standard time.

Average relative humidity (%) in January
Daily Place Morning Afternoon
71 Des Moines 75 63
Dubuque 76 66
72 Sioux City 77 63
73 Waterloo 76 67

Highest and Lowest Humidity

Below are the averages during January for maximum and minimum humidity levels in Iowa. The hours when this month's highest and lowest humidity readings usually occur are given in local standard time.

Daily high and low relative humidity (%) averages in January
High Time Place Low Time
75.4 6 am Des Moines 63.0 3 pm
75.8 6 am Dubuque 65.7 3 pm
76.6 6 am Sioux City 63.0 3 pm
76.0 6 am Waterloo 66.8 3 pm

World Data Center for Meteorology. Climate of the World.

Iowa Humidity
Back to Top