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Climate · Napa

Napa in December

Mild and damp, as the days hold steady.

Typical weather, averaged over 30 years

December in Napa is mild: highs near 62°F, lows near 42°F. Rain falls on about two days a week, and daylight holds at about 9 hours 32 minutes.December in Napa is mild: highs near 17°C, lows near 6°C. Rain falls on about two days a week, and daylight holds at about 9 hours 32 minutes.

High
62°F17°Caverage
Low
42°F6°Caverage
Wet days
2a week · 32% of days
Daylight
9h 32mon average

Is December a good time to visit Napa?

December sits outside Napa's best months, which run in two parts: April to May, or October to November. Expect mild days and rain on about two days a week.

How we judge it: every month is scored on how close its typical high comes to the range from 70°F to 80°F, how mild its nights are, and how rarely it rains. The best months are the run of months that scores best.How we judge it: every month is scored on how close its typical high comes to the range from 21°C to 27°C, how mild its nights are, and how rarely it rains. The best months are the run of months that scores best.

How December sits in the year

week by week

Temperature

Highs near 62°F in December, against 62°F to 92°F through the year.Highs near 17°C in December, against 17°C to 33°C through the year.

Chance of a wet day

32% of days in December, against 0% to 34% through the year.

Cloud cover

56% cover in December, against 11% to 59% through the year.

Daylight

9h 32m in December, against 9h 32m to 14h 47m through the year.

Week by week, lightly smoothed, with December shaded. The olive line marks the best months. Hover or tap a week for its figures.

Either side

  1. November71°22°low 48°low 9°1 wet day a weekRain on about one day a week.
  2. December62°17°low 42°low 6°2 wet days a weekRain on about two days a week.
  3. January62°17°low 41°low 5°2 wet days a weekRain on about two days a week.

Where Napa sits, in December

America/Los Angeles
this place
typical high in December 40°F4°C95°F35°C
Sunrise, mid-December
7:19 AMsets 4:50 PM
Above the sea
0 mlow-lying
Latitude
38.3°Nnorthern hemisphere
Nearest of ours
Marshall55 km west

The land around Napa, shaded by its typical high in December, the planning map's own layer. Hover the map for the figure at that spot; tap it on a phone. Clock times are local, for the 15th.

Elsewhere in United States in December

high · low · wet days
See December on the planning mapThe whole year in Napa

Typical weather, averaged over 30 years (1995–2024), from the 11 km grid square nearest Napa. Temperatures are adjusted against 66 weather stations: daytime highs read about 3.1°F cold in the source data and are raised to match, and both highs and lows are adjusted for the town's height (0 m) against the climate model's (136 m).Temperatures are adjusted against 66 weather stations: daytime highs read about 1.7°C cold in the source data and are raised to match, and both highs and lows are adjusted for the town's height (0 m) against the climate model's (136 m). Daylight is calculated from latitude. Charts are lightly smoothed week to week; the figures in the table are not. Source: Copernicus ERA5-Land reanalysis; cloud cover from NASA's MERRA-2 reanalysis, on a coarser grid of about 50 km. Contains modified Copernicus Climate Change Service information 2026; neither the European Commission nor ECMWF is responsible for any use of it. These are averages, not a forecast.

Daylight is calculated from latitude. Charts are lightly smoothed week to week; the figures in the table are not.

Source: Copernicus ERA5-Land reanalysis; cloud cover from NASA's MERRA-2 reanalysis, on a coarser grid of about 50 km. Contains modified Copernicus Climate Change Service information 2026; neither the European Commission nor ECMWF is responsible for any use of it. These are averages, not a forecast.