Earliest and Latest Days of 90° F in Janesville

This is a list of the earliest and latest days in the year with a high temperature of at least 90 °F in Janesville, Wisconsin history. It is based on NOAA data from the years 1893–2024.

Also see:

Earliest 90 degree day in Janesville?

The earliest in the year that Janesville, Wisconsin had a high temperature of at least 90 °F is April 22 which happened in 1980.

Latest 90 degree day in Janesville?

The latest in the year that Janesville, Wisconsin had a high temperature of at least 90 °F is September 30 which happened in 1971.

Earliest Days ≥ 90 °F

Date	Year	Temperature
April 22	1980	91 °F
May 4	1959	90 °F
May 4	1952	90 °F
May 5	1959	90 °F
May 5	1949	90 °F
May 9	1979	90 °F
May 9	1895	91 °F
May 10	1895	90 °F
May 11	2022	92 °F
May 11	2011	92 °F
May 12	2022	94 °F
May 12	2011	90 °F
May 13	2022	93 °F
May 14	2022	92 °F
May 15	2013	90 °F
May 16	1962	91 °F
May 16	1894	90 °F
May 17	1962	91 °F
May 18	1977	90 °F
May 18	1962	93 °F

Latest Days ≥ 90 °F

Date	Year	Temperature
September 30	1971	91 °F
September 29	1953	94 °F
September 27	2017	90 °F
September 27	1998	90 °F
September 26	2017	94 °F
September 25	2017	93 °F
September 24	2017	95 °F
September 23	2017	95 °F
September 22	2017	92 °F
September 22	1895	91 °F
September 21	2022	90 °F
September 21	2017	93 °F
September 21	1895	91 °F
September 21	1893	91 °F
September 20	2021	91 °F
September 20	2013	90 °F
September 20	1895	92 °F
September 19	1978	90 °F
September 19	1948	92 °F
September 19	1947	91 °F
September 19	1895	93 °F