Janesville

What is the climate like in Janesville?

The best time to visit Janesville is typically June – September, with trip comfort peaking in July (6.7/10). Janesville is warmest in July, when daily highs average 83°F (28°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 (960 mm) of precipitation.

• Best time to visitJune – September — comfort peaks in July (6.7/10)
• Warmest monthJuly — average high 83°F (28°C)
• Coolest monthJanuary — average low 17°F (-8°C)
• Wettest monthMay (4.4 in (111 mm))
• Driest monthFebruary (1.7 in (43 mm))
• Annual precipitation38 in (960 mm)
• Based on2016-2025 daily ERA5 reanalysis data (10-year normals)
• Records fromBeloit, 20 km away (1893-2026)