Grand Junction (CO) Weather & Climate: Best Time to Visit

In Grand Junction, temperatures differ significantly between summer and winter months. Average daytime temperatures reach a very warm 34°C (93°F) in July. In January, the coolest month of the year, temperatures drop to a chilly 3°C (37°F).

At night, temperatures range from around 18°C (64°F) in July to -9°C (16°F) in January.

Check out our detailed temperature page for more information.

Temperature ranges by month

Grand Junction sits in an arid zone with minimal moisture, averaging 245 mm (9.6 in) of rain/snowfall per year. Grand Junction can be quite wet during October, receiving approximately 30 mm (1.2 in) of precipitation over 8 rainy days.

In contrast, during the driest month (June), you will experience much drier conditions, with 11 mm (0.4 in) of precipitation spread across 3 rainy days. For more details, please visit our Grand Junction Precipitation page.

The mean monthly precipitation over the year, including rain, hail, and snow

The average number of days each month with precipitation

Grand Junction can be enjoyed more throughout the sunniest month of June under a blue sky, with approximately 11.9 hours of sunshine daily. In contrast, the city experiences much darker days in December, with only 6.0 hours of sunlight per day.

Visit our detailed sunshine hours page for more information.

Monthly hours of sunshine

Daily hours of sunshine

The relative humidity is moderate throughout the year in Grand Junction.

The city experiences its highest humidity in January, reaching 68%. In June, the humidity drops to its lowest level at 28%. What does this mean? Read our detailed page on humidity levels for further details.

Relative humidity over the year

The average wind speed over the year ranges from 2 m/s (4 knots) to 5 m/s (10 knots). It is lower in January and higher in June. What does this mean?

The mean monthly wind speed over the year (meters per second)