Humidity Levels in Illinois During October

The average humidity in October is listed below for places in Illinois. 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 October
Daily Place Morning Afternoon
69 Chicago 81 53
68 Moline 81 50
70 Peoria 85 53
71 Rockford 86 53
68 Springfield 83 51

Highest and Lowest Humidity

Below are the averages during October for maximum and minimum humidity levels in Illinois. 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 October
High Time Place Low Time
81.4 6 am Chicago 52.7 3 pm
81.2 6 am Moline 50.1 3 pm
84.6 6 am Peoria 53.0 3 pm
85.5 6 am Rockford 52.5 3 pm
83.3 6 am Springfield 50.6 3 pm

World Data Center for Meteorology. Climate of the World.

Illinois Humidity
Back to Top