Roscoe (IL) Weather & Climate: Best Time to Visit
Average temperatures, rainfall, sunshine and the best time to visit Roscoe.
Climate overview of Roscoe
Roscoe, Illinois, United States of America, sees big temperature differences between seasons, with July peaking at 26°C (79°F) and January dropping to -1°C (30°F).
With around 1377 mm (54 in) of annual rain/snowfall, Roscoe 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.
Roscoe Weather by Month
Pick a month to see the average temperature, rainfall and sunshine in Roscoe - and find the best time to visit.
Monthly Temperature in Roscoe
Visitors to Roscoe can expect significant temperature changes throughout the year. Average daytime temperatures reach a comfortable 26°C (79°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 14°C (57°F) in July to -12°C (10°F) in January.
Check out our detailed temperature page for more information.
Temperature ranges by month
Rainfall in Roscoe
Roscoe is known for its substantial rain/snowfall, with annual precipitation reaching 1377 mm (54 in). Roscoe experiences moderate seasonal variation in rainfall, with monthly averages ranging from 163 mm (6.4 in) in June, the wettest month, and 79 mm (3.1 in) in January, the driest month. For more details, please visit our Roscoe Precipitation page.
The mean monthly precipitation over the year, including rain, hail, and snow
The average number of days each month with precipitation
Humidity in Roscoe by Month
The relative humidity is high throughout the year in Roscoe.
The city experiences its highest humidity in July, reaching 71%. In April, the humidity drops to its lowest level at 55%. What does this mean? Read our detailed page on humidity levels for further details.
Relative humidity over the year
Best Time to Visit Roscoe
Monthly ratings reflect general weather comfort, based on daytime temperature and rainfall. Swimming and winter conditions are highlighted separately where relevant.
- Best overall: June, July, August and September
- Warmest weather: July and August
- Seasonal pattern: Warm summers and very cold winters
- Coldest conditions: January, with freezing nights around -12°C (10°F).
Frequently asked questions about the climate in Roscoe
What is the best time to visit Roscoe?
June, July, August and September typically offer the most optimal weather in Roscoe. In contrast, January, February, March, November and December tend to have less optimal conditions. Roscoe has warm summers and very cold winters.
What temperatures can I expect in Roscoe?
Daytime highs range from -1°C (30°F) in January to 26°C (79°F) in July. Nighttime lows range from -12°C (10°F) to 14°C (57°F). Temperatures vary considerably through the year.
How much rain does Roscoe get?
Annual rainfall is around 1377 mm (54 in). June is the wettest month with 163 mm (6.4 in), while January is the driest with 79 mm (3.1 in).
Roscoe 3-Day Forecast
Roscoe on the map
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