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United States of AmericaUnited States of America Illinois O'Fallon
O'Fallon
Average sun percentage
Climate ▸Forecast ▸December ▸January ▸
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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)?

Thu   Dec 26
13°C | 6°C
SE 4 m/s
1.9 mm
broken clouds and chance of rain

broken clouds and chance of rain

hourly forecast
Fri   Dec 27
14°C | 8°C
SE 5 m/s
4.6 mm
overcast and rain

overcast and rain

hourly forecast
Sat   Dec 28
16°C | 7°C
SW 3 m/s
broken clouds and no rain

broken clouds and no rain

hourly forecast
5-Day Forecast 10-Day Forecast

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