Average percent of sunshine in O'Fallon (IL)
The mean percent of sunhours during the day in O'Fallon (Illinois), the United States of America.
- The sun shines on average 68.0% in July making it the most sunny month.
- On average, December has the lowest percentage of sunshine with 44.0%.
Forecast: is it sunny in O'Fallon (IL)?
almost clear and no rain
broken clouds and thunder
broken clouds and thunder