Montana has an average annual temperature of
42.1°F
(across all 6 cities) with approximately
566 mm of annual precipitation
and average humidity of 70%.
The warmest city is Billings
with average July highs of 99.9°F,
while Bozeman
is the coldest with average January lows of -15.9°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 Montana with average highs around
92.5°F, while
Jan is the coldest with average lows near
-10.1°F.
May is the wettest month with approximately
74 mm of rainfall on average.
Month
Max Temp
Min Temp
Avg Temp
Rain (mm)
Humidity
Wind (m/s)
Solar (kWh/m²)
Jan
39.9°F
-10.1°F
14.9°F
40
89%
1.8
1.50
Feb
45.7°F
-8.3°F
18.7°F
36
85%
1.8
2.50
Mar
57°F
5°F
31.1°F
43
77%
1.7
3.60
Apr
69.4°F
17.2°F
43.3°F
54
69%
1.6
4.70
May
78.1°F
25.3°F
51.8°F
74
65%
1.4
5.70
Jun
86.4°F
34.2°F
60.3°F
72
62%
1.3
6.40
Jul
92.5°F
42.6°F
67.6°F
37
53%
1.1
7.00
Aug
92.1°F
41.5°F
66.7°F
37
50%
1.1
5.90
Sep
85.8°F
29.7°F
57.7°F
39
55%
1.3
4.40
Oct
73.4°F
18°F
45.7°F
43
66%
1.4
2.80
Nov
55.2°F
5°F
30.2°F
45
78%
1.6
1.60
Dec
41°F
-7.6°F
16.7°F
43
86%
1.7
1.20
📈 Montana Yearly Climate Trends
🌡️ Annual Temperature Trend
State-wide avg annual high & low · Last 10 years
📈 Montana Long-Term Climate Trends (1981–2025)
This chart shows how Montana'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 6 cities in the state.
🌧️ Annual Precipitation Trend
State-wide avg annual precipitation · Last 10 years · mm/year
🔗 Explore Cities in Montana
Browse detailed weather history, monthly averages, and 45-year climate trends for every city in Montana.
Kalispell is the wettest city in Montana with approximately 703 mm of annual precipitation on average. View Kalispell weather history →
What is the warmest month in Montana?▼
Jul is the warmest month across Montana, with state-wide average highs of 92.5°F and average lows of 42.6°F.
How many cities in Montana have weather data?▼
TownPillar has historical weather data for 6 cities in Montana, covering 45 years of NASA POWER climate records from 1981 to 2025.
Which month has the most sunshine in Montana?▼
Jul is the sunniest month across Montana with an average solar radiation of 7.00 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 6 cities in Montana at monthly temporal resolution.