What is the weather like in Napa vs San Francisco in December?

In December, Napa averages 15°C high / 5°C low with about 136 mm of rain; San Francisco averages 15°C high / 9°C low with about 121 mm.

Napa vs San Francisco in December

San Francisco is the better pick in December — 67 vs 63 on SeasonMap's comfort score. San Francisco is cool, rainy, clean air, while Napa is cool, rainy, clean air.

Napa vs San Francisco — December climate, side by side

	🇺🇸 Napa	🇺🇸 San Francisco
Comfort score	63/100 (C)	67/100 (C)
Feels-like high	13°C	13°C
Avg high / low	15° / 5°	15° / 9°
Rainfall	136 mm	121 mm
Rainy days	10	9
Humidity	79%	82%
Air quality (AQI)	35	50

Monthly climate normals (ERA5 reanalysis). Comfort scores are SeasonMap estimates.

Month by month

Napa vs San Francisco in December — FAQ

Is December better in Napa or San Francisco?: San Francisco is the better pick in December — 67 vs 63 on SeasonMap's comfort score. San Francisco is cool, rainy, clean air, while Napa is cool, rainy, clean air.
What is the weather like in Napa vs San Francisco in December?: In December, Napa averages 15°C high / 5°C low with about 136 mm of rain; San Francisco averages 15°C high / 9°C low with about 121 mm.