Weather in Janesville in January
How warm is it in Janesville in January?
In January the typical daytime high in Janesville is -1.3 °C on average, from -0.4 °C at the start to -0.7 °C at the end of the month.
That is 2.8 °C cooler than in December and 2.5 °C cooler than in February.
The last 10 years were 1.3 °C warmer than more than 40 years ago.
Click a day for more: afternoon and night, the usual range, records and how fast it is warming.
The average of the weather stations Rock Is L&D (182 km), Green Bay (215 km) and Cedar Rapids (223 km); nearer ones count more.