Idaho Falls climate — normals and trends
Idaho Falls (United States) has a hot-summer humid continental climate (Dfa) under the Köppen-Geiger classification. Its mean annual temperature is 7.6 °C and it receives 411 mm of precipitation per year.
These figures are normals computed over 86 complete calendar years, from 1940 to 2025, using ERA5 reanalysis data from the Copernicus programme.
The warmest month is July (22.5 °C on average) and the coldest is January (-6.0 °C). Rainfall peaks in May.
Idaho Falls averages 156 frost days, 42 hot days (≥ 30 °C) and 96 rainy days per year.
Idaho Falls has warmed by +2.4 °C between 1940 and 2025, or +0.28 °C per decade. This trend is statistically significant.
The number of frost days there went from about 170 to 142 per year over the period.
The hottest day of the period reached 39.1 °C (on 13 July 2002) and the coldest -37.1 °C (on 10 December 1972).
Data from ERA5 reanalysis (Copernicus Climate Change Service), redistributed under a CC-BY 4.0 licence. Normals are recomputed whenever the archive is updated.
Climate normals · ERA5
Idaho FallsIdaho
- coords
- 43.47°, -112.03°
- period
- 1940–2025 · 86 yrs
Mean daily temperature
7.6°C
Average daily high
13.7°C
Average daily low
1.6°C
Annual rainfall
411mm
Sunshine / day
10.4h
Mean relative humidity
56%
Average peak wind
16.0km/h
Seasonal range
28.5°C
Frost days (< 0 °C)
156 d/yr
Hot days (≥ 30 °C)
42 d/yr
Rainy days (≥ 1 mm)
96 d/yr
Annual snowfall
116.0 cm
Average feels-like high
10.3 °C
Average feels-like low
-2.2 °C
Average peak gust
36.1 km/h
Tropical nights (≥ 20 °C)
1 d/yr
Solar radiation
17.4 MJ/m²
Has the climate changed?
One stripe per year, 1940 to 2025
+2.4 °C
since 1940
+0.3 °C per decade · r² = 0.34 · p = < 0.001
Trend fitted by linear regression (ordinary least squares) on annual means. A trend is shown only when it is statistically significant (p < 0.05).
A climograph overlays rainfall (bars) and temperature (line): the standard reading in climatology, where you can see at a glance whether the warm season is also the dry one.
Records for the period
Hottest day
39.1 °C
13 July 2002
Coldest day
-37.1 °C
10 December 1972
Wettest day
36 mm
23 September 2016
Windiest day
48.8 km/h
11 January 1972
Strongest gust
106.6 km/h
18 February 1986
Hottest feels-like
38.9 °C
12 July 2002
Coldest feels-like
-42.1 °C
10 December 1972
Snowiest day
13.2 cm
25 December 2008
Sunniest day
15.0 h
1 June 1940
Normals computed over complete calendar years 1940–2025.
A specific year
Pick a year and see how it compares to normal — warmer, drier or more extreme than usual?
Across the whole year
Month by month
| High | vs. normal | Precipitation | vs. normal | |
|---|---|---|---|---|
| Jan | -2.9 °C | -0.9 °C | 27 mm | -12 mm |
| Feb | 1.9 °C | +0.6 °C | 63 mm | +30 mm |
| Mar | 9.4 °C | +2.9 °C | 41 mm | +1 mm |
| Apr | 15.1 °C | +2.3 °C | 25 mm | -21 mm |
| May | 20.9 °C | +2.2 °C | 50 mm | -3 mm |
| Jun | 26.6 °C | +2.2 °C | 8 mm | -27 mm |
| Jul | 31.2 °C | +0.7 °C | 8 mm | -6 mm |
| Aug | 29.6 °C | +0.5 °C | 26 mm | +9 mm |
| Sep | 24.8 °C | +1.7 °C | 20 mm | -7 mm |
| Oct | 13.7 °C | -1.4 °C | 53 mm | +21 mm |
| Nov | 9.8 °C | +4.4 °C | 13 mm | -23 mm |
| Dec | 6.1 °C | +6.7 °C | 62 mm | +21 mm |
The year's extremes
What was the weather like that day?
Your birthday, a wedding, a memorable trip: discover the actual weather for any date since 1940.
Frequently asked questions
What is the climate of Idaho Falls?
Idaho Falls has a hot-summer humid continental climate (Köppen Dfa). Over 1940-2025, the average annual temperature is 7.6 °C and it receives 411 mm of precipitation per year.
What is the hottest day ever recorded in Idaho Falls?
The hottest day measured in Idaho Falls between 1940 and 2025 was 13 July 2002, reaching 39.1 °C.
What is the coldest day in Idaho Falls?
The coldest day measured in Idaho Falls between 1940 and 2025 was 10 December 1972, at -37.1 °C.
Does it snow in Idaho Falls?
Yes. Idaho Falls gets on average 116.0 cm of snow per year and has around 156 frost days.
Has the climate of Idaho Falls warmed?
Yes: Idaho Falls warmed by +2.4 °C between 1940 and 2025, a statistically significant trend.
What is the wettest day in Idaho Falls?
The wettest day measured in Idaho Falls between 1940 and 2025 was 23 September 2016, with 36 mm of rain in 24 hours.
What was the windiest day in Idaho Falls?
The windiest day measured in Idaho Falls between 1940 and 2025 was 11 January 1972, with winds reaching 48.8 km/h.
What is the warmest month in Idaho Falls?
The warmest month in Idaho Falls is July (22.5 °C on average); the coldest is January (-6.0 °C).
How much does it rain in Idaho Falls?
Idaho Falls receives on average 411 mm of precipitation per year, spread over about 96 rainy days.
Is it sunny in Idaho Falls?
Idaho Falls gets on average 10.4 hours of sunshine per day, roughly 3,796 hours per year over 1940-2025.
What is the biggest single-day snowfall in Idaho Falls?
The heaviest 24-hour snowfall measured in Idaho Falls between 1940 and 2025 was 25 December 2008, with 13.2 cm.
Are there tropical nights in Idaho Falls?
Yes: Idaho Falls has on average 1 tropical nights per year (temperature staying above 20 °C), over 1940-2025.
What was the most extreme apparent temperature in Idaho Falls?
In Idaho Falls, between 1940 and 2025, the highest apparent temperature reached 38.9 °C on 12 July 2002, and the lowest was -42.1 °C on 10 December 1972.
Compare Idaho Falls with another city
Pick a second city: its normals will be set against these, indicator by indicator.
Nearby cities
The climate around Idaho Falls