Earliest and Latest Days of 90° F in Casper

This is a list of the earliest and latest days in the year with a high temperature of at least 90 °F in Casper, Wyoming history. It is based on NOAA data from the years 1900–2024.

Also see:

Earliest 90 degree day in Casper?

The earliest in the year that Casper, Wyoming had a high temperature of at least 90 °F is May 17 which has happened twice, most recently in 1912.

Latest 90 degree day in Casper?

The latest in the year that Casper, Wyoming had a high temperature of at least 90 °F is September 28 which happened in 2010.

Earliest Days ≥ 90 °F

Date	Year	Temperature
May 17	1912	99 °F
May 17	1901	92 °F
May 18	1937	90 °F
May 18	1912	93 °F
May 19	1912	94 °F
May 22	1912	93 °F
May 23	1912	97 °F
May 24	1912	93 °F
May 26	2006	91 °F
May 26	1912	90 °F
May 27	1969	91 °F
May 27	1912	99 °F
May 28	2014	92 °F
May 29	2003	95 °F
May 30	2002	90 °F
May 30	1984	92 °F
May 30	1939	92 °F
May 30	1936	91 °F
May 30	1911	97 °F
May 31	2020	91 °F
May 31	1936	90 °F
May 31	1911	90 °F

Latest Days ≥ 90 °F

Date	Year	Temperature
September 28	2010	92 °F
September 26	2015	91 °F
September 26	2014	90 °F
September 26	2010	90 °F
September 25	2014	90 °F
September 25	1911	98 °F
September 24	1911	100 °F
September 23	1992	90 °F
September 21	1911	100 °F
September 20	1911	100 °F
September 19	2010	92 °F
September 19	1935	95 °F
September 19	1914	90 °F
September 19	1911	103 °F
September 18	2014	92 °F
September 18	1914	90 °F
September 18	1911	101 °F
September 17	1911	99 °F
September 16	2000	94 °F
September 16	1911	97 °F