Earliest and Latest Days of 100° F in Great Falls

This is a list of the earliest and latest days in the year with a high temperature of at least 100 °F in Great Falls, Montana history. It is based on NOAA data from the years 1892–2024.

Also see:

Earliest 100 degree day in Great Falls?

The earliest in the year that Great Falls, Montana had a high temperature of at least 100 °F is May 28 which happened in 1919.

Latest 100 degree day in Great Falls?

The latest in the year that Great Falls, Montana had a high temperature of at least 100 °F is September 7 which happened in 2022.

Earliest Days ≥ 100 °F

Date	Year	Temperature
May 28	1919	100 °F
June 15	1933	100 °F
June 16	1933	100 °F
June 20	1919	100 °F
June 21	1919	102 °F
June 21	1900	102 °F
June 23	1936	101 °F
June 26	1919	101 °F
June 27	1936	101 °F
June 30	1990	101 °F
June 30	1892	100 °F
July 4	1937	101 °F
July 5	1985	101 °F
July 5	1981	101 °F
July 5	1919	101 °F
July 6	2007	104 °F
July 6	1985	101 °F
July 8	1930	101 °F
July 10	1973	105 °F
July 10	1939	100 °F
July 10	1919	100 °F

Latest Days ≥ 100 °F

Date	Year	Temperature
September 7	2022	100 °F
September 3	2022	102 °F
August 25	1970	100 °F
August 25	1926	100 °F
August 24	1969	106 °F
August 23	1969	102 °F
August 18	1964	101 °F
August 17	2023	101 °F
August 16	2013	101 °F
August 16	1973	100 °F
August 15	2023	100 °F
August 15	1990	101 °F
August 14	2015	100 °F
August 14	1971	101 °F
August 14	1929	100 °F
August 14	1892	100 °F
August 12	1940	105 °F
August 11	1996	101 °F
August 10	2018	102 °F
August 10	2003	100 °F
August 10	1984	104 °F
August 10	1928	101 °F