The highest day temperature in December 2025 was 103°F. The lowest night temperature was 67°F. The average values for day and night temperatures during December were 90.3°F и 74.1°F respectivly.

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

Precipitation total in December for Montero is 2.6 in. It makes december the most rainy month of the year.

The average wind speed in December is 6.9 mph.

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 Montero in December is 6.2 hours.