Idaho has an average annual temperature of
49.1°F
(across all 10 cities) with approximately
481 mm of annual precipitation
and average humidity of 61%.
The warmest city is Caldwell
with average July highs of 104.7°F,
while Rexburg
is the coldest with average January lows of -11.7°F.
This page covers 45 years of NASA POWER climate data (1981–2025)
including temperature, rainfall, humidity, wind speed, and solar radiation.
Jul is typically the warmest month across Idaho with average highs around
99.1°F, while
Jan is the coldest with average lows near
1.2°F.
Dec is the wettest month with approximately
62 mm of rainfall on average.
Month
Max Temp
Min Temp
Avg Temp
Rain (mm)
Humidity
Wind (m/s)
Solar (kWh/m²)
Jan
43.5°F
1.2°F
22.3°F
56
86%
2.0
1.60
Feb
51.4°F
6.3°F
28.9°F
45
79%
2.2
2.60
Mar
64.2°F
17.1°F
40.6°F
50
70%
2.3
3.90
Apr
75.2°F
23.9°F
49.6°F
42
62%
2.3
5.30
May
84.4°F
29.7°F
57°F
50
57%
2.2
6.40
Jun
92.7°F
38.5°F
65.7°F
33
50%
2.1
7.20
Jul
99.1°F
48.6°F
73.9°F
16
39%
2.0
7.50
Aug
98.1°F
47.8°F
73°F
19
37%
1.9
6.40
Sep
91.6°F
36.3°F
64°F
24
42%
1.9
5.00
Oct
78.4°F
24.8°F
51.6°F
37
55%
2.0
3.30
Nov
61.2°F
14.4°F
37.8°F
54
72%
2.1
1.90
Dec
45.7°F
3°F
24.3°F
62
83%
2.1
1.30
📈 Idaho Yearly Climate Trends
🌡️ Annual Temperature Trend
State-wide avg annual high & low · Last 10 years
📈 Idaho Long-Term Climate Trends (1981–2025)
This chart shows how Idaho's average temperatures have shifted across 45 years.
Use the range buttons to focus on recent decades or view the full historical record.
Data is averaged across all 10 cities in the state.
🌧️ Annual Precipitation Trend
State-wide avg annual precipitation · Last 10 years · mm/year
🔗 Explore Cities in Idaho
Browse detailed weather history, monthly averages, and 45-year climate trends for every city in Idaho.
Post Falls is the wettest city in Idaho with approximately 758 mm of annual precipitation on average. View Post Falls weather history →
What is the warmest month in Idaho?▼
Jul is the warmest month across Idaho, with state-wide average highs of 99.1°F and average lows of 48.6°F.
How many cities in Idaho have weather data?▼
TownPillar has historical weather data for 10 cities in Idaho, covering 45 years of NASA POWER climate records from 1981 to 2025.
Which month has the most sunshine in Idaho?▼
Jul is the sunniest month across Idaho with an average solar radiation of 7.50 kWh/m²/day state-wide. This solar radiation data from NASA POWER is useful for solar energy planning, agriculture, and understanding seasonal sunshine availability.
Where does this climate data come from?▼
All data is sourced from NASA POWER (Prediction Of Worldwide Energy Resources), based on MERRA-2 satellite reanalysis data. It includes monthly temperature, precipitation, humidity, wind speed, and solar radiation at 0.5° × 0.625° spatial resolution.
📚 Data Source
All weather data is sourced from NASA POWER (Prediction of Worldwide Energy Resources). Data covers 45 years (1981–2025) across 10 cities in Idaho at monthly temporal resolution.