Earliest and Latest Snowfalls in Thermopolis History

This is a list of the earliest and latest times in the year when snow was recorded in Thermopolis, Wyoming. It is based on NOAA data from the years 1899–2024.

What's the Earliest it has Snowed in Thermopolis?

The earliest in the season it has snowed in Thermopolis, Wyoming is September 7 which happened in 2020.

What's the Latest it has Snowed in Thermopolis?

The latest in the season it has snowed in Thermopolis, Wyoming is June 4 which happened in 1937.

Earliest Snowfalls

Date	Year	Snowfall
September 7	2020	2.0 inches
September 15	1912	2.0 inches
September 22	2000	4.5 inches
September 23	1913	1.5 inches
September 24	1912	1.0 inches
September 25	1934	1.8 inches
September 27	2013	2.0 inches
September 29	1961	0.9 inches
October 4	2013	8.0 inches
October 5	1941	5.0 inches
October 5	1913	1.5 inches
October 5	1912	6.0 inches
October 6	2012	1.0 inches
October 6	2007	0.5 inches
October 6	1913	0.3 inches
October 6	1912	3.0 inches
October 7	2007	0.5 inches
October 8	1997	1.0 inches
October 9	2009	5.0 inches
October 9	1913	0.2 inches
October 9	1912	1.0 inches

Latest Snowfalls

Date	Year	Snowfall
June 4	1937	3.0 inches
May 30	1917	2.0 inches
May 26	1918	1.0 inches
May 22	2008	3.0 inches
May 20	1959	1.0 inches
May 20	1908	2.0 inches
May 18	1960	0.5 inches
May 12	1953	5.0 inches
May 12	1933	2.0 inches
May 11	1933	6.0 inches
May 10	1918	1.0 inches
May 9	1918	1.0 inches
May 6	2010	3.0 inches
May 5	1933	0.1 inches
May 5	1917	11.0 inches
May 4	1933	0.2 inches
May 4	1912	2.0 inches
May 3	1933	1.0 inches
May 3	1912	4.0 inches
May 2	1913	1.5 inches
May 2	1899	4.0 inches