Earliest and Latest Days of 100° F in Missoula

This is a list of the earliest and latest days in the year with a high temperature of at least 100 °F in Missoula, Montana history. It is based on NOAA data from the years 1893–2024.

Also see:

Earliest 100 degree day in Missoula?

The earliest in the year that Missoula, Montana had a high temperature of at least 100 °F is June 13 which happened in 1918.

Latest 100 degree day in Missoula?

The latest in the year that Missoula, Montana had a high temperature of at least 100 °F is August 24 which happened in 1969.

Earliest Days ≥ 100 °F

Date	Year	Temperature
June 13	1918	100 °F
June 27	2015	101 °F
June 28	2015	102 °F
June 29	2021	101 °F
June 29	1937	100 °F
June 30	2021	102 °F
July 1	1924	100 °F
July 2	2013	101 °F
July 2	1924	102 °F
July 4	1937	101 °F
July 5	2007	102 °F
July 6	2007	107 °F
July 6	1985	101 °F
July 7	2017	100 °F
July 8	2017	101 °F
July 9	1985	101 °F
July 9	1939	102 °F
July 9	1918	101 °F
July 10	1973	105 °F
July 10	1919	100 °F

Latest Days ≥ 100 °F

Date	Year	Temperature
August 24	1969	102 °F
August 23	1969	103 °F
August 22	1969	100 °F
August 21	1969	100 °F
August 19	2022	101 °F
August 19	1961	100 °F
August 18	2022	100 °F
August 18	2008	100 °F
August 17	2023	101 °F
August 17	2022	100 °F
August 17	2020	100 °F
August 16	2023	100 °F
August 15	2023	103 °F
August 14	1992	100 °F
August 13	1971	100 °F
August 12	1940	100 °F
August 11	2018	100 °F
August 11	1996	100 °F
August 10	2018	104 °F
August 10	1928	102 °F