Great Falls receives its highest rainfall in Jun, while humidity peaks during winter months.
🌧️ Wettest:Jun — 72 mm☀️ Driest:Feb — 22 mm
💧 Humidity peaks at 80% in Jan · annual avg 64%
🌍 Climate Summary
Avg Annual Temp:45.7°F
Avg Annual Rainfall:464 mm
Avg Humidity:64%
Data Period:1981 – 2025
Great Falls Climate Overview
Great Falls has a temperate climate with warm summers and freezing winters.
Temperatures peak in Jul and drop to their lowest in Jan,
while rainfall is highest during summer months.
Humidity remains moderate throughout the year, especially during winter months, creating cold and dry conditions.
📈 Yearly Trends
The warmest year in Great Falls's recorded history was 2001
(avg: 49.6°F),
while the coldest year was 1985
(avg: 40.1°F),
based on annual average temperatures.
📊 Key Climate Trends
🌡️ Great Falls's temperature has remained relatively stable over the past decade
📊 Minimum temperatures have remained largely stable across the dataset
🌧️ Rainfall varies year-to-year without a clear long-term trend
🌡️ Annual Temperature Trend
View Range:
Average annual high/low · Last 10 years · °F
Great Falls's temperatures has remained relatively stable over the past decade.
The highest recorded temperature reached
103.3°F in Jul 2007,
while the lowest dropped to
-38°F in Dec 1983.
🌧️ Annual Precipitation
View Range:
Total annual precipitation · Last 10 years · mm/year
Annual rainfall in Great Falls shows noticeable variation. Rainfall varies year-to-year without a clear long-term trend.
Based on 45 years of data (1981–2025), Jul is typically the hottest month in Great Falls, Montana, with average high temperatures around 95.5°F.
What is the coldest month in Great Falls?▼
Jan is the coldest month in Great Falls, with average low temperatures around -7.3°F.
What is the rainiest month in Great Falls?▼
Jun receives the most rainfall with approximately 72 mm, while Feb is the driest with 22 mm.
What was the highest temperature ever recorded in Great Falls?▼
The highest recorded temperature was 103.3°F in Jul 2007. This is part of the historical record spanning 1981–2025.
What was the lowest temperature ever recorded in Great Falls?▼
The lowest recorded temperature was -38°F in Dec 1983.
How many years of data does this page cover?▼
This page covers 45 years of climate data from 1981 to 2025. As new data is added to the database the page automatically reflects the updated coverage.
How much sunlight does Great Falls get?▼
Great Falls receives the most sunlight in Jul with an average solar radiation of 7.00 kWh/m²/day. This solar radiation data, sourced from NASA POWER, is useful for solar energy planning, agriculture, and understanding seasonal sunshine availability in Montana.
Where does this weather data come from?▼
All climate data is sourced from NASA POWER (Prediction Of Worldwide Energy Resources), based on MERRA-2 satellite and model data. It provides monthly averages for temperature, precipitation, humidity, wind speed, and solar radiation.
📚 Data Source
All weather data is sourced from NASA POWER (Prediction of Worldwide Energy Resources), a NASA project providing solar and meteorological data for renewable energy, building efficiency, and agricultural research.