Temperature
Cool by day, cold at night.
59°Ftypical December high
Typical range
December climate
December in Calistoga / Napa Valley
United States · North America
Cool days.
Good overall
Daytime high
59°F
Lows around 43°F
Rain
Several rainy days
Sun
6.5 h/day
Air feel
Very dry
When to visit
Month-by-month fit
Best
Precipitation
Several rainy days, with some sustained wet spells. About 10 wet days, the highest monthly average.
32%wet-day frequency
AmountWet-day chance
Sunshine
A mix of sunshine and cloud.
6.5 hDecember sunshine
Heat & humidity by month
Very dryDecember Heat feel
Easy airWarm airHot airHumid air
Hourly temperature pattern
In December, afternoons feel about 53° and nights feel near 40°.
Very coldColdCoolComfortableWarmHotNight hours
Clear sky
Mostly cloudy skies this month.
39%December Clear sky
Clear skyCloud
Wind pattern
Calm winds are typical in December.
4 mphDecember Calm
More detailIncludes daypart comfort
Typical December day
December late afternoons are around 57°F, easing to about 50°F in early evening.
Avg temp Typical range
Morning49°F
Rain17%
Cloud61%
Humid airLow
Sun intensityLow
Midday56°F
Rain20%
Cloud59%
Humid airLow
Sun intensityModerate
Late afternoon57°F
Rain19%
Cloud59%
Humid airLow
Sun intensityMinimal
Early evening50°F
Rain19%
Cloud57%
Humid airLow
Sun intensityMinimal
Best windowData tableView month-by-month numbers
View month-by-month numbers
| Month | High°F | Low°F | Rainin | Wet days | Sunh | Humidity% |
|---|---|---|---|---|---|---|
| Jan | 60 | 43 | 5.0 | 9 | 6.7 | 77 |
| Feb | 63 | 44 | 5.4 | 10 | 8.0 | 73 |
| Mar | 67 | 46 | 3.7 | 9 | 9.4 | 70 |
| Apr | 72 | 49 | 1.6 | 5 | 11.3 | 64 |
| May | 79 | 54 | 0.9 | 3 | 12.8 | 59 |
| Jun | 86 | 59 | 0.2 | 1 | 13.6 | 54 |
| Jul | 90 | 61 | 0.0 | 0 | 13.9 | 56 |
| Aug | 89 | 61 | 0.0 | 0 | 13.0 | 58 |
| Sep | 87 | 59 | 0.2 | 1 | 11.9 | 57 |
| Oct | 79 | 54 | 1.4 | 3 | 9.9 | 59 |
| Nov | 67 | 47 | 3.0 | 7 | 8.1 | 71 |
| Dec | 59 | 43 | 5.6 | 10 | 6.5 | 76 |
Similar climates
Similar
Similar travel styleLos OlivosUnited StatesSimilar travel styleMontecitoUnited StatesSimilar travel styleSan Miguel de AllendeMexicoSimilar travel styleLaguna BeachUnited States
Want a side-by-side climate view? Compare Calistoga / Napa Valley with Los Olivos.
Climate data notePlanning guidance, not a forecast
Typical monthly values are based on long-term climate records. Useful for planning, not a forecast. Check the weather before you travel.
Sunshine: source type is not yet identified at metric level.
Local microclimates can vary by beach, neighborhood, trail, or elevation.
Last updated: Jun 1, 2026
Data & methodology