Climate almanac
Roscoe
Illinois, United States · 42.41°, -89.01°
What is the climate like in Roscoe?
The best time to visit Roscoe is typically June – September, with trip comfort peaking in August (6.8/10). Roscoe is warmest in July, when daily highs average 83°F (29°C), and coolest in January, when lows fall to about 17°F (-8°C). The wettest month is typically May and the driest is February; the year sees roughly 38 in (964 mm) of precipitation.
- Best time to visitJune – September — comfort peaks in August (6.8/10)
- Warmest monthJuly — average high 83°F (29°C)
- Coolest monthJanuary — average low 17°F (-8°C)
- Wettest monthMay (4.6 in (117 mm))
- Driest monthFebruary (1.7 in (44 mm))
- Annual precipitation38 in (964 mm)
- Based on2016-2025 daily ERA5 reanalysis data (10-year normals)
- Records fromBeloit, 10 km away (1893-2026)