Average Sunshine in Illinois for July
Number of Sunny Days
In the table below, the average number of Sunny Days for a city in Illinois is the total days this month 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.
City | Sunny Days |
Partly Sunny Days |
Total Days With Sun |
---|---|---|---|
Cairo | 9 | 13 | 22 |
Chicago | 8 | 12 | 20 |
Moline | 10 | 12 | 22 |
Peoria | 9 | 12 | 21 |
Rockford | 9 | 12 | 21 |
Springfield | 10 | 11 | 21 |
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 monthly averages based on many years of weather observations.
City | % Sun |
---|---|
Cairo | 74 |
Chicago | 66 |
Moline | 68 |
Peoria | 69 |
Springfield | 71 |
Reference
National Climatic Data Center. Comparative Climatic Data.