April weather in Janesville, WI
The average temperature in Janesville in April is 47.0°F (36.1°F–57.9°F). Average precipitation: 3.57 inches. Average snowfall is 1.3 inches.
April is a spring month in Janesville, and is cooler than the annual average of 47.8°F. Daily temperatures swing about 21.8°F between overnight low and afternoon high. Expect about 12 days with precipitation. Daylight averages about 13h 10m. For travel, April is cool.
Avg High
57.9°F
Avg Low
36.1°F
Precipitation
3.57 in
Snow
1.3 in
April records in Janesville
| Date | Record High | Record Low | Record Precip |
|---|---|---|---|
| April 1 | 77.0°F (2010) | 19.0°F (2018) | 1.43 in (1993) |
| April 2 | 82.9°F (2010) | 18.0°F (2018) | 0.78 in (1988) |
| April 3 | 78.1°F (2010) | 18.0°F (2018) | 2.20 in (2024) |
| April 4 | 73.0°F (2016) | 16.0°F (1995) | 0.96 in (2017) |
| April 5 | 81.0°F (1988) | 15.1°F (1995) | 0.73 in (1988) |
| April 6 | 78.1°F (1991) | 19.0°F (1995) | 1.30 in (2010) |
| April 7 | 84.0°F (1991) | 16.0°F (2018) | 0.55 in (2010) |
| April 8 | 80.1°F (2001) | 15.1°F (2018) | 1.00 in (1998) |
| April 9 | 75.9°F (1991) | 16.0°F (1997) | 1.90 in (2013) |
| April 10 | 75.9°F (2017) | 19.0°F (2003) | 1.78 in (2013) |
| April 11 | 82.0°F (2011) | 23.0°F (1990) | 1.32 in (2008) |
| April 12 | 78.1°F (2023) | 21.9°F (1989) | 0.80 in (2001) |
| April 13 | 81.0°F (2023) | 21.9°F (1997) | 0.60 in (2020) |
| April 14 | 82.0°F (2023) | 21.0°F (1997) | 1.60 in (2014) |
| April 15 | 84.9°F (2003) | 19.9°F (2014) | 1.21 in (1993) |
| April 16 | 88.0°F (2002) | 21.0°F (2014) | 1.31 in (2026) |
| April 17 | 84.0°F (2002) | 23.0°F (1990) | 0.67 in (2006) |
| April 18 | 82.0°F (2002) | 24.1°F (1988) | 3.62 in (2026) |
| April 19 | 89.1°F (2002) | 27.0°F (2018) | 0.72 in (2025) |
| April 20 | 80.1°F (2005) | 25.0°F (1988) | 2.67 in (1993) |
| April 21 | 80.1°F (2014) | 26.1°F (2018) | 1.10 in (2004) |
| April 22 | 79.0°F (2001) | 26.1°F (2021) | 0.60 in (1988) |
| April 23 | 82.9°F (2007) | 28.0°F (2015) | 2.05 in (1999) |
| April 24 | 84.9°F (1990) | 26.1°F (2015) | 0.67 in (1989) |
| April 25 | 84.9°F (1990) | 28.9°F (2015) | 0.94 in (2007) |
| April 26 | 84.0°F (1990) | 27.0°F (2023) | 2.00 in (2009) |
| April 27 | 84.0°F (1990) | 28.0°F (1996) | 1.13 in (2017) |
| April 28 | 82.9°F (2021) | 26.1°F (2019) | 1.05 in (1999) |
| April 29 | 82.9°F (2004) | 27.0°F (2018) | 0.61 in (2020) |
| April 30 | 84.0°F (2007) | 24.1°F (2025) | 0.76 in (1996) |