Earliest and Latest Snowfalls in Riverton History

This is a list of the earliest and latest times in the year when snow was recorded in Riverton, Wyoming. It is based on NOAA data from the years 1907–2024.

What's the Earliest it has Snowed in Riverton?

The earliest in the season it has snowed in Riverton, Wyoming is September 4 which happened in 1999.

What's the Latest it has Snowed in Riverton?

The latest in the season it has snowed in Riverton, Wyoming is June 5 which happened in 1943.

Earliest Snowfalls

Date	Year	Snowfall
September 4	1999	0.2 inches
September 6	1929	3.0 inches
September 8	2020	2.9 inches
September 9	2020	0.4 inches
September 12	2014	0.3 inches
September 16	1965	1.0 inches
September 17	1965	3.0 inches
September 18	1965	1.0 inches
September 18	1942	2.0 inches
September 19	1957	1.3 inches
September 21	1946	4.0 inches
September 22	2000	0.5 inches
September 22	1931	1.0 inches
September 23	2000	3.3 inches
September 24	2000	1.9 inches
September 24	1934	1.0 inches
September 24	1912	4.0 inches
September 25	1934	1.0 inches
September 27	2013	5.7 inches
September 27	1999	0.3 inches
September 27	1945	2.0 inches

Latest Snowfalls

Date	Year	Snowfall
June 5	1943	1.0 inches
June 4	1943	3.0 inches
June 4	1937	3.0 inches
June 2	1951	1.5 inches
June 1	1951	8.0 inches
May 31	2011	0.5 inches
May 30	2011	4.8 inches
May 30	1919	4.0 inches
May 29	2011	0.2 inches
May 26	1932	1.0 inches
May 25	1975	0.3 inches
May 23	2008	2.0 inches
May 22	2019	4.3 inches
May 21	2019	1.0 inches
May 21	2001	0.8 inches
May 20	2019	1.3 inches
May 20	2011	0.1 inches
May 20	1975	5.0 inches
May 19	2017	1.2 inches
May 18	2017	1.0 inches