O'Fallon Weather in January

Thinking of visiting O'Fallon in January? Expect low temperatures reaching 5°C (41°F) during the day, dropping to -5°C (23°F) at night, with the driest conditions of the year.

Rainfall in O'Fallon in January

With the lowest rainfall figures of the year, conditions are ideal for exploring the outdoors, even if the temperatures require a jacket. Past climate data indicates that roughly 7 days will see snow/rain, totalling around 56 mm (2.2 in) for the month. Rainfall intensity is on the higher side this month. Expect more substantial showers rather than light, passing rain.

Temperature in O'Fallon in January

Daytime temperatures in O'Fallon reach 5°C (41°F) in January, dropping to -5°C (23°F) at night. During January, the winter season is in full swing. Even daytime conditions remain cold, making layers, a warm coat, and winter accessories a good idea. Nights are well below freezing at -5°C (23°F). An extra blanket is a good idea if you feel the cold, especially in older or less well-heated accommodation. It's often the coldest month of the year, a perfect time to cozy up indoors. Make sure to bring along suitable winter clothing.

Sunshine in O'Fallon in January

The city usually sees around 163 hours of sunlight, indicating a moderately sunny period.

If you're looking for dry conditions and comfortable temperatures, January may not be the ideal month to visit O'Fallon. Our weather planner can help you explore destinations with more pleasant weather conditions.

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• January
• February
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For a detailed overview over the year and the best time to visit the United States of America, check out our O'Fallon's climate page.

O'Fallon Temperature in January

Min Temperature -5°C (23°F)  

Max Temperature 5°C (41°F)  

Chance of Rain 23%  

Precipitation 56 mm (2.2 in)  

Rainy days 7 days  

Humidity 72% *  

Sunshine 163 hours *  

Percentage Sunshine 53% *  

* Data from: St. Louis, the United States of America (25 KM, 15 Miles).

What to Wear in O'Fallon in January

Dress warmly and in layers for your trip to O'Fallon in January. A good base layer system works wonders. Start with good thermal underwear, add something warm like a fleece sweater, then finish with a waterproof jacket on top. Wet weather is likely, so pack waterproof gear for multiple rainy days. Bring sunglasses since you'll have some sunny periods throughout the month

What To Do in O'Fallon in January

We rated the following activities from 1 (least suitable) to 10 (best) to do.

Swimming

5/10

Cycling

3/10

Walking

3/10

Camping

1/10

Outdoor sports

3/10

Select a Month

Check the conditions for any month of the year.

• January
• February
• March
• April

• May
• June
• July
• August

• September
• October
• November
• December

For a detailed overview over the year and the best time to visit the United States of America, check out our O'Fallon's climate page.

More climate data for O'Fallon

Temperature Rainfall Sunshine Humidity

See the full O'Fallon climate overview or explore weather in the United States of America.