Days of Sunshine Per Year in Illinois

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Number of Sunny Days

In the table below, the average number of Sunny Days for a city in Illinois is the total days in a year when the sky is mostly clear. This includes the days when cloud covers up to 30% of the sky during daylight hours. Partly Sunny Days have cloud covering from 40% to 70% of the sky during the daytime.

Total Days With Sun is a sum of the Sunny plus Partly Sunny days. The rest of the days are mainly overcast, with at least 80% cloud cover. All the numbers are annual averages, made from years of weather watching.

Annual days of sunshine
City Sunny
Days
Partly Sunny
Days
Total Days
With Sun
Cairo 113 104 217
Chicago   84 105 189
Moline 101 100 201
Peoria   95   97 192
Rockford   93   98 191
Springfield 104   94 198

Amount of Sun

Here's another way to look at how much sunshine a city gets. The % Sun number measures the percentage of time between sunrise and sunset that sunshine reaches the ground. Again, these amounts are yearly averages based on many years of weather observations.

Percent sunshine yearly
City % Sun
Cairo 61
Chicago 54
Moline 55
Peoria 56
Springfield 59
Reference

National Climatic Data Center. Comparative Climatic Data.

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