inland destination · city of 39,719 · warmest in Jul · mid-range
Open Romeoville on the live value map →| Month | Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Avg °C | -6 | -3 | 3 | 10 | 16 | 21 | 24 | 22 | 18 | 12 | 4 | -3 |
| High °C | -1 | 2 | 9 | 16 | 22 | 28 | 30 | 28 | 25 | 18 | 9 | 2 |
| Low °C | -10 | -8 | -2 | 3 | 9 | 15 | 17 | 16 | 12 | 5 | 0 | -7 |
| Rain (days) | 39 | 36 | 68 | 98 | 98 | 104 | 99 | 98 | 93 | 68 | 76 | 62 |
Warmest month: Jul. Driest: Feb.