The highest day temperature in December 2025 was 68°F. The lowest night temperature was 22°F. The average values for day and night temperatures during December were 50.1°F и 31.8°F respectivly.

Most of the days in December are sunny but you can also expect cloudy and gloomy days.

Precipitation total in December for Grand Junction is 0.4 in. This value is relatively stable throughout the year.

The average wind speed in December is 3.9 mph. It makes December one of the most windless months of the year for Grand Junction.

We are using day length and cloud cover information for each day of the month to calculate averages for this chart. Average sunny hours for Grand Junction in December is 6.8 hours.