Grand Junction receives its highest rainfall in Oct, while humidity peaks during winter months.
🌧️ Wettest:Oct — 42 mm☀️ Driest:Jun — 19 mm
💧 Humidity peaks at 72% in Jan · annual avg 52%
🌍 Climate Summary
Avg Annual Temp:49.5°F
Avg Annual Rainfall:395 mm
Avg Humidity:52%
Data Period:1981 – 2025
Grand Junction Climate Overview
Grand Junction 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 autumn months.
Humidity remains relatively low throughout the year, especially during winter months, creating cold and dry conditions.
📈 Yearly Trends
The warmest year in Grand Junction's recorded history was 2025
(avg: 54.3°F),
while the coldest year was 1985
(avg: 46.4°F),
based on annual average temperatures.
📊 Key Climate Trends
🌡️ Grand Junction's temperature shows a slight warming trend over the past decade
📈 Minimum temperatures show a slight warming trend in recent years
🌧️ Rainfall varies year-to-year without a clear long-term trend
🌡️ Annual Temperature Trend
View Range:
Average annual high/low · Last 10 years · °F
Grand Junction's temperatures shows a slight warming trend over the past decade.
The highest recorded temperature reached
103°F in Jul 2023,
while the lowest dropped to
-26.9°F in Feb 1989.
🌧️ Annual Precipitation
View Range:
Total annual precipitation · Last 10 years · mm/year
Annual rainfall in Grand Junction 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 Grand Junction, Colorado, with average high temperatures around 98.1°F.
What is the coldest month in Grand Junction?▼
Jan is the coldest month in Grand Junction, with average low temperatures around 1.5°F.
What is the rainiest month in Grand Junction?▼
Oct receives the most rainfall with approximately 42 mm, while Jun is the driest with 19 mm.
What was the highest temperature ever recorded in Grand Junction?▼
The highest recorded temperature was 103°F in Jul 2023. This is part of the historical record spanning 1981–2025.
What was the lowest temperature ever recorded in Grand Junction?▼
The lowest recorded temperature was -26.9°F in Feb 1989.
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 Grand Junction get?▼
Grand Junction receives the most sunlight in Jun with an average solar radiation of 7.83 kWh/m²/day. This solar radiation data, sourced from NASA POWER, is useful for solar energy planning, agriculture, and understanding seasonal sunshine availability in Colorado.
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.