How extreme does Idaho Falls's weather get?

The hottest, coldest, wettest and snowiest days Idaho Falls has recorded — the outer limits of what its weather can do, and how far they sit beyond a normal day.

Based on 50+ years of daily weather observations (1971–present), from the Idaho Falls - Kifi station 6 km away. Updated through May 2026 — an all-time extreme only changes when a more extreme day actually occurs, so some dates are old. That is normal, not stale data.

The four kinds of extreme

The hottest, coldest, wettest and snowiest single days Idaho Falls has recorded — each shown against what a normal day that time of year looks like.

🔥 Hottest day

104°F Jul 12, 2002

That is about 18°F hotter than a normal July afternoon in Idaho Falls (typical high near 86°F).

The three most extreme on record

1 104°F Jul 12, 2002

2 104°F Jul 13, 2002

3 103°F Jul 22, 2003

❄️ Coldest night

-34°F Feb 1, 1985

About 54°F colder than a normal February night in Idaho Falls (typical low near 20°F).

The three most extreme on record

1 -34°F Feb 1, 1985

2 -29°F Dec 10, 1972

3 -28°F Dec 9, 1972

🌧️ Most rain in one day

1.97 in May 23, 2023

More rain in a single day than Idaho Falls usually gets in the whole month of May (typical May total about 1.9 in).

The three most extreme on record

1 1.97 in May 23, 2023recent

2 1.73 in Sep 12, 1998

3 1.68 in Jun 1, 2005

⛄ Most snow in one day

12.5 in Apr 16, 2002

The three most extreme on record

1 12.5 in Apr 16, 2002

2 10.0 in Dec 4, 1983

3 10.0 in Feb 25, 2000

How hot and cold it gets, month by month

The shaded band is the normal range of daily temperatures for each month. The dots show the most extreme it has ever been — so you can see how far beyond a normal day the records really sit.

normal range of daily temperatureshottest ever recordedcoldest ever recorded

Idaho Falls's record heat sits well above even a hot day for the season — July's 104°F is about 18°F beyond a normal hot afternoon. Its record cold is just as far below a normal winter night — the dots mark how rare each extreme really is.

In plain terms

In a normal year, Idaho Falls's warmest days reach the mid-80s°F and its coldest nights drop to the mid-10s°F. But across the record it has gone as high as 104°F and as low as −34°F. A single day has delivered over 2 inches of rain or close to 13 inches of snow. Those are the outer edges worth knowing if you are moving here, planning a trip, or thinking about a house.

Methodology & sources

Temperature & precipitation — the official 1991–2020 climate normals from NOAA's U.S. Climate Normals, measured at Idaho Falls - Kifi (NOAA GHCN station USC00104455), about 6 km from the city centre.

How we build these numbers →

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