Yosemite National Park is definitely worth a visit
Vast forests, blue lakes, towering sequoias, and majestic waterfalls hint at the beauty of Yosemite National Park—a true natural masterpiece.
Rock Falls (IL) Weather & Climate: Best Time to Visit
Average temperatures, rainfall, sunshine and the best time to visit Rock Falls.
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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. However, this rain/snowfall is not evenly distributed, the city has warm summers and very cold winters. 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 most comfortable overall weather for exploring Rock Falls is usually found in September. Conditions are generally least comfortable in January, February, March, November and December.
Monthly ratings reflect general weather comfort, based on daytime temperature and rainfall. Swimming and winter conditions are highlighted separately where relevant.
Jan
very cold
Feb
very cold
Mar
cold
Apr
mixed
May
very good
Jun
very good
Jul
very good
Aug
very good
Sep
excellent
Oct
good
Nov
cold
Dec
cold
- Best overall: September
- Warmest weather: July and August
- Fewest rainy days: January, February, September and November
- Seasonal pattern: Warm summers and very cold winters
- Coldest conditions: January, with freezing nights around -11°C (12°F).
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. Rock Falls has warm summers and very cold winters.
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 on the map
Rock Falls is highlighted - select any city to see its climate.
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