Earliest and Latest Days of 90° F in Riverton

This is a list of the earliest and latest days in the year with a high temperature of at least 90 °F in Riverton, Wyoming history. It is based on NOAA data from the years 1907–2024.

Also see:

Earliest 90 degree day in Riverton?

The earliest in the year that Riverton, Wyoming had a high temperature of at least 90 °F is May 14 which happened in 1936.

Latest 90 degree day in Riverton?

The latest in the year that Riverton, Wyoming had a high temperature of at least 90 °F is October 1 which happened in 1980.

Earliest Days ≥ 90 °F

Date	Year	Temperature
May 14	1936	91 °F
May 16	1987	90 °F
May 17	1988	90 °F
May 17	1948	90 °F
May 19	2009	90 °F
May 20	2009	91 °F
May 20	1992	91 °F
May 20	1954	92 °F
May 21	1964	90 °F
May 21	1954	94 °F
May 27	1969	90 °F
May 27	1919	90 °F
May 28	1969	90 °F
May 29	2014	90 °F
May 29	2003	93 °F
May 29	1966	90 °F
May 30	2003	94 °F
May 30	1936	90 °F
May 31	2020	90 °F
May 31	2002	92 °F
May 31	1984	96 °F

Latest Days ≥ 90 °F

Date	Year	Temperature
October 1	1980	90 °F
September 24	1992	90 °F
September 21	1956	90 °F
September 20	2010	91 °F
September 20	1981	91 °F
September 19	2014	91 °F
September 19	1984	90 °F
September 19	1981	95 °F
September 19	1937	90 °F
September 17	2000	93 °F
September 17	1920	90 °F
September 16	2018	90 °F
September 16	2000	93 °F
September 16	1948	92 °F
September 16	1920	90 °F
September 15	1959	90 °F
September 15	1948	96 °F
September 14	2015	91 °F
September 14	2006	90 °F
September 14	1948	91 °F