Typical Weather in Mount Vernon, IL in January
39° F Avg High
21° F Avg Low
5 Rainy Days
☀️ Temperature Summary
Highs in January are typically around 39°F, which is cooler than usual in Mount Vernon. Pack a jacket if you're considering a visit to Mount Vernon at this time. Overnight lows can reach 21°F. This is the coldest month of the year in Mount Vernon.
You may want to consider a warmer month to visit Mount Vernon, unless you're ready to brave the cold. If you're looking to travel when it's warmer, you might consider visiting in December instead, when daily highs are typically closer to 43°.
High Temps Throughout the Year
🎒 What to Pack
Pick up a few of these items to keep your trip fun and comfortable.
☔ Rain Summary
You can expect about a 16% chance of rain for any given day in January. It's one of the drier months of the year for Mount Vernon, with total rainfall for the month around 3 inches.
Rainfall Throughout the Year
Planning a trip to Mount Vernon? Try our free trip weather planner