Earliest and Latest Days of 90° F in Flagstaff

This is a list of the earliest and latest days in the year with a high temperature of at least 90 °F in Flagstaff, Arizona history. It is based on NOAA data from the years 1893–2024.

Also see:

Earliest 90 degree day in Flagstaff?

The earliest in the year that Flagstaff, Arizona had a high temperature of at least 90 °F is May 26 which happened in 1896.

Latest 90 degree day in Flagstaff?

The latest in the year that Flagstaff, Arizona had a high temperature of at least 90 °F is September 6 which happened in 2020.

Earliest Days ≥ 90 °F

Date	Year	Temperature
May 26	1896	90 °F
May 27	1896	93 °F
May 28	1896	92 °F
May 30	1896	90 °F
June 6	2010	90 °F
June 8	2013	91 °F
June 9	2013	90 °F
June 12	1974	90 °F
June 12	1939	90 °F
June 13	1974	92 °F
June 13	1940	90 °F
June 13	1930	90 °F
June 13	1896	92 °F
June 14	2021	92 °F
June 14	1974	92 °F
June 14	1936	91 °F
June 15	2021	94 °F
June 15	2000	91 °F
June 15	1974	92 °F
June 16	2021	92 °F
June 16	1940	92 °F

Latest Days ≥ 90 °F

Date	Year	Temperature
September 6	2020	91 °F
September 5	2020	90 °F
September 4	2020	90 °F
September 1	1950	90 °F
August 27	1926	92 °F
August 24	1985	91 °F
August 23	1985	90 °F
August 22	2020	90 °F
August 21	2009	90 °F
August 21	1991	90 °F
August 20	2009	90 °F
August 19	1898	91 °F
August 18	1898	93 °F
August 17	2020	91 °F
August 16	2020	93 °F
August 16	1898	92 °F
August 15	2020	91 °F
August 15	1898	90 °F
August 14	2020	92 °F
August 14	1898	94 °F