Rock Falls (IL) Weather & Climate: Best Time to Visit
Average temperatures, rainfall, sunshine and the best time to visit Rock Falls.
Climate overview of Rock Falls
Rock Falls, Illinois, United States of America, sees big temperature differences between seasons, with July peaking at 29°C (84°F) and January dropping to -1°C (30°F).
With around 1011 mm (40 in) of annual rain/snowfall, Rock Falls has a notably wet climate. The wettest month is June.
Rock Falls Weather by Month
Pick a month to see the average temperature, rainfall and sunshine in Rock Falls — and find the best time to visit.
Monthly Temperature in Rock Falls
Visitors to Rock Falls can expect significant temperature changes throughout the year. Average daytime temperatures reach a comfortable 29°C (84°F) in July. In January, the coolest month of the year, temperatures drop to a very cold -1°C (30°F).
At night, temperatures range from around 17°C (63°F) in July to -11°C (12°F) in January.
Check out our detailed temperature page for more information.
Temperature ranges by month
Rainfall in Rock Falls
Rock Falls is known for its substantial rain/snowfall, with annual precipitation reaching 1011 mm (40 in). Rock Falls can be quite wet during June, receiving approximately 144 mm (5.7 in) of precipitation over 13 rainy days.
In contrast, during the driest month (January), you will experience much drier conditions, with 38 mm (1.5 in) of precipitation spread across 9 snowy days. For more details, please visit our Rock Falls Precipitation page.
The mean monthly precipitation over the year, including rain, hail, and snow
The average number of days each month with precipitation
Best Time to Visit Rock Falls
The weather does bring rainfall during this period, between 84 mm (3.3 in) and 144 mm (5.7 in). Planning your next adventure but unsure where to go? Our climate tool suggests perfect locations tailored to your preferred weather conditions. Discover your ideal travel destination with our weather planner.
Frequently asked questions about the climate in Rock Falls
What is the best time to visit Rock Falls?
September typically offers the most optimal weather in Rock Falls. In contrast, January, February, March, November and December tend to have less optimal conditions.
What temperatures can I expect in Rock Falls?
Daytime highs range from -1°C (30°F) in January to 29°C (84°F) in July. Nighttime lows range from -11°C (12°F) to 17°C (63°F). Temperatures vary considerably through the year.
How much rain does Rock Falls get?
Annual rainfall is around 1011 mm (40 in). June is the wettest month with 144 mm (5.7 in), while January is the driest with 38 mm (1.5 in).
Rock Falls 3-Day Forecast
Rock Falls (IL) 3-Day Forecast
Rock Falls on the map
Rock Falls is highlighted — select any city to see its climate.
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Where to go in July — average daytime high across popular destinations.
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