Climate almanac
Rock Falls
Illinois, US · 41.78°, -89.69°
What is the climate like in Rock Falls?
The best time to visit Rock Falls is typically August – September, with trip comfort peaking in August (7.1/10). Rock Falls is warmest in July, when daily highs average 84°F (29°C), and coolest in January, when lows fall to about 18°F (-8°C). The wettest month is typically May and the driest is February; the year sees roughly 40 in of precipitation.
- Best time to visitAugust – September — comfort peaks in August (7.1/10)
- Warmest monthJuly — average high 84°F (29°C)
- Coolest monthJanuary — average low 18°F (-8°C)
- Wettest monthMay (4.9 in)
- Driest monthFebruary (2.0 in)
- Annual precipitation40 in