Climate almanac
Clinton
Illinois, United States · 40.15°, -88.96°
What is the climate like in Clinton?
The best time to visit Clinton is typically August – September, with trip comfort peaking in September (7.5/10). Clinton is warmest in July, when daily highs average 85°F (29°C), and coolest in January, when lows fall to about 22°F (-5°C). The wettest month is typically May and the driest is December; the year sees roughly 43 in (1089 mm) of precipitation.
- Best time to visitAugust – September — comfort peaks in September (7.5/10)
- Warmest monthJuly — average high 85°F (29°C)
- Coolest monthJanuary — average low 22°F (-5°C)
- Wettest monthMay (4.8 in (122 mm))
- Driest monthDecember (2.4 in (60 mm))
- Annual precipitation43 in (1089 mm)
- Based on2016-2025 daily ERA5 reanalysis data (10-year normals)
- Records fromLincoln, 32 km away (1906-2026)