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Average Monthly Sunshine in O'Fallon (MO)

The graphs on this page shows the average number of hours per month and per day that O'Fallon receives direct sunlight. The numbers are calculated over a 30-year period to provide a reliable average.

Monthly hours of sunshine


Those who love seasonal contrasts will appreciate O'Fallon. Expect long, bright days with 311 hours in July and darker periods with just 128 hours in December. The total annual amount of sun is 2612 hours.

Daily hours of sunshine


Summer days are longer and more sunny, with daily sunshine hours peaking at 10.4 hours in July. As the darker season arrives, the brightness of the sun becomes less. December sees a soft sun for only 4.3 hours.

O'Fallon’s total hours of sunshine compared to other major cities

O'Fallon enjoys an average of 2612 hours of sunshine annually. Let’s compare this with some popular tourist destinations:

Athens, Greece, enjoys 2769 hours of sunshine each year, making it one of the sunniest destinations in the Mediterranean region.

In contrast, Dublin, Ireland, receives only about 1440 hours of sunshine per year, known for its frequently overcast and rainy skies.

In Shanghai, China, the annual average sunshine is 1780 hours, with cloudier weather in summer.

Perth, Australia, enjoys 3180 hours of sunshine annually, the highest among major Australian cities.

Other climate information

June, O'Fallon’s wettest month, receives 105 mm of rainfall and has a maximum daytime temperature of 30°C. During the driest month January you can expect a temperature of 5°C.

For more detailed insights into the city’s temperatures, check out our Temperature page. To explore more about precipitation patterns, visit our Precipitation page.


Forecast: is it sunny in O'Fallon (MO)?

Sun   Dec 22
7°C | -4°C
SE 5 m/s
clear and no rain

clear and no rain

Mon   Dec 23
10°C | 2°C
SW 4 m/s
overcast and no rain

overcast and no rain

Tue   Dec 24
8°C | 2°C
NE 3 m/s
7.1 mm
broken clouds and rain

broken clouds and rain

Interested in more climate information?

This site provides you with all the information you need about the climate in O'Fallon.

Our site offers climate and forecast data for every country in the world. Are you going to the United States of America? On this website you can find historical weather averages for many cities in the United States of America. Not sure yet where to go? We now have a tool which recommends destinations that suit your ideal travel conditions. Find out where to go with our weather planner.