Earliest and Latest Days of 90° F in West Yellowstone

This is a list of the earliest and latest days in the year with a high temperature of at least 90 °F in West Yellowstone, Montana history. It is based on NOAA data from the years 1924–2024.

Also see:

Earliest 90 degree day in West Yellowstone?

The earliest in the year that West Yellowstone, Montana had a high temperature of at least 90 °F is June 18 which happened in 1940.

Latest 90 degree day in West Yellowstone?

The latest in the year that West Yellowstone, Montana had a high temperature of at least 90 °F is September 7 which happened in 2022.

Earliest Days ≥ 90 °F

Date	Year	Temperature
June 18	1940	91 °F
June 20	1940	91 °F
June 22	1936	90 °F
June 23	1936	93 °F
June 24	1988	90 °F
June 25	1988	91 °F
June 26	1970	91 °F
June 27	2015	92 °F
June 28	2015	91 °F
June 29	2015	92 °F
July 1	1924	90 °F
July 2	2013	91 °F
July 4	2007	91 °F
July 4	1937	91 °F
July 5	2017	91 °F
July 5	2007	93 °F
July 5	1942	93 °F
July 5	1936	90 °F
July 6	2007	94 °F
July 6	1966	91 °F
July 6	1942	91 °F

Latest Days ≥ 90 °F

Date	Year	Temperature
September 7	2022	90 °F
September 4	1950	91 °F
September 3	2022	91 °F
September 3	1950	91 °F
September 2	1950	90 °F
August 30	1954	90 °F
August 26	1981	91 °F
August 24	1969	92 °F
August 23	1969	91 °F
August 23	1942	90 °F
August 22	1969	90 °F
August 20	1946	91 °F
August 19	1992	90 °F
August 19	1942	91 °F
August 18	1940	91 °F
August 17	2020	92 °F
August 16	2013	90 °F
August 16	1958	90 °F
August 16	1939	90 °F
August 15	2003	91 °F