The highest day temperature in December 2025 was 61°F. The lowest night temperature was 29°F. The average values for day and night temperatures during December were 51.3°F и 37.6°F respectivly.

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

Precipitation total in December for Capella is 0.8 in. It makes december the least rainy month of the year.

The average wind speed in December is 3.7 mph. This value is relatively stable throughout the year.

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 Capella in December is 7.0 hours.