O'Fallon Weather in December

December in O'Fallon brings low temperatures, with highs of 7°C (45°F) and nights dropping to -2°C (28°F). Rainfall is on the higher side this month, averaging around 95 mm (3.7 in), so keep a rain jacket handy.

Rainfall in O'Fallon in December

Expect around 11 days of snow/rain based on historical data, with 95 mm (3.7 in) average. Individual showers can be quite heavy this month. A proper umbrella or rain jacket is worth having.

Temperature in O'Fallon in December

In December, O'Fallon sees low temperatures, with highs of 7°C (45°F). Nights drop to around -2°C (28°F). December is part of winter. Cold conditions persist throughout the day, so warm clothing is important from the moment you head outside. Nights are well below freezing at -2°C (28°F). An extra blanket is a good idea if you feel the cold, especially in older or less well-heated accommodation.

Sunshine in O'Fallon in December

The area enjoys a moderate level of sunlight, with around 128 hours. It's a good balance between sunny and cloudy days.

December in O'Fallon can still be great, but if you prefer pleasant temperatures along with dry and sunny conditions, our weather planner can help you explore other options in the world.