Earliest and Latest Days of 90° F in Waterloo

This is a list of the earliest and latest days in the year with a high temperature of at least 90 °F in Waterloo, Iowa history. It is based on NOAA data from the years 1895–2024.

Also see:

Earliest 90 degree day in Waterloo?

The earliest in the year that Waterloo, Iowa had a high temperature of at least 90 °F is April 10 which happened in 1930.

Latest 90 degree day in Waterloo?

The latest in the year that Waterloo, Iowa had a high temperature of at least 90 °F is October 14 which happened in 1897.

Earliest Days ≥ 90 °F

Date	Year	Temperature
April 10	1930	92 °F
April 14	2003	90 °F
April 15	2002	91 °F
April 18	1994	92 °F
April 18	1985	91 °F
April 21	1980	93 °F
April 22	1980	100 °F
April 22	1925	95 °F
April 24	1939	90 °F
April 25	1949	90 °F
April 30	2007	90 °F
April 30	1926	90 °F
April 30	1910	92 °F
May 1	2021	93 °F
May 2	1901	91 °F
May 3	1949	90 °F
May 4	1918	91 °F
May 5	1962	91 °F
May 5	1949	90 °F
May 5	1934	91 °F
May 5	1924	91 °F
May 5	1918	93 °F

Latest Days ≥ 90 °F

Date	Year	Temperature
October 14	1897	90 °F
October 13	1975	90 °F
October 12	1930	95 °F
October 11	1920	90 °F
October 8	1916	90 °F
October 6	1997	90 °F
October 6	1963	95 °F
October 5	1997	90 °F
October 5	1963	93 °F
October 3	1997	95 °F
October 3	1897	91 °F
October 2	2023	90 °F
October 2	1997	90 °F
October 2	1953	93 °F
October 2	1897	90 °F
October 1	2023	93 °F
October 1	1976	90 °F
October 1	1897	91 °F
September 30	2023	94 °F
September 30	2019	91 °F
September 30	1952	91 °F
September 30	1897	92 °F