Earliest and Latest Days of 90° F in Great Falls

This is a list of the earliest and latest days in the year with a high temperature of at least 90 °F in Great Falls, Montana history. It is based on NOAA data from the years 1892–2024.

Also see:

Earliest 90 degree day in Great Falls?

The earliest in the year that Great Falls, Montana had a high temperature of at least 90 °F is May 12 which happened in 2001.

Latest 90 degree day in Great Falls?

The latest in the year that Great Falls, Montana had a high temperature of at least 90 °F is October 11 which happened in 1934.

Earliest Days ≥ 90 °F

Date	Year	Temperature
May 12	2001	90 °F
May 14	1936	95 °F
May 14	1931	94 °F
May 14	1917	90 °F
May 15	1897	93 °F
May 16	1988	92 °F
May 16	1897	91 °F
May 18	2006	90 °F
May 19	1919	94 °F
May 20	1919	91 °F
May 20	1897	94 °F
May 21	1980	93 °F
May 22	1928	92 °F
May 22	1919	97 °F
May 24	1922	90 °F
May 24	1919	90 °F
May 25	1934	91 °F
May 25	1928	94 °F
May 25	1922	92 °F
May 25	1919	91 °F

Latest Days ≥ 90 °F

Date	Year	Temperature
October 11	1934	90 °F
October 3	1943	91 °F
October 1	1992	91 °F
September 30	2011	90 °F
September 30	1992	91 °F
September 29	1967	91 °F
September 28	2022	91 °F
September 27	1963	91 °F
September 25	2014	91 °F
September 25	2011	91 °F
September 25	2001	93 °F
September 24	2011	90 °F
September 24	2009	93 °F
September 24	2001	91 °F
September 23	2009	92 °F
September 23	1966	93 °F
September 22	1938	91 °F
September 22	1897	90 °F
September 21	1917	90 °F
September 20	1918	92 °F
September 20	1917	93 °F