Earliest and Latest Days of 100° F in Idaho Falls

This is a list of the earliest and latest days in the year with a high temperature of at least 100 °F in Idaho Falls, Idaho history. It is based on NOAA data from the years 1948–2024.

Also see:

Earliest 100 degree day in Idaho Falls?

The earliest in the year that Idaho Falls, Idaho had a high temperature of at least 100 °F is June 25 which happened in 1988.

Latest 100 degree day in Idaho Falls?

The latest in the year that Idaho Falls, Idaho had a high temperature of at least 100 °F is September 3 which happened in 2022.

Earliest Days ≥ 100 °F

Date	Year	Temperature
June 25	1988	102 °F
June 29	2015	101 °F
July 12	2002	100 °F
July 13	2002	101 °F
July 17	1998	100 °F
July 20	1960	101 °F
July 23	2023	101 °F
July 23	2007	100 °F
July 23	2003	100 °F
July 30	1966	100 °F
July 31	2000	100 °F
July 31	1989	100 °F
August 4	1961	100 °F
August 7	1983	100 °F
September 3	2022	100 °F

Latest Days ≥ 100 °F

Date	Year	Temperature
September 3	2022	100 °F
August 7	1983	100 °F
August 4	1961	100 °F
July 31	2000	100 °F
July 31	1989	100 °F
July 30	1966	100 °F
July 23	2023	101 °F
July 23	2007	100 °F
July 23	2003	100 °F
July 20	1960	101 °F
July 17	1998	100 °F
July 13	2002	101 °F
July 12	2002	100 °F
June 29	2015	101 °F
June 25	1988	102 °F