December weather forecast
Calistoga, CA

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Vineyard and tree lines in a plantation in the Napa Valley in Calistoga, California
Vineyard and tree lines in a plantation in the Napa Valley in Calistoga, California

Weather in December

The first month of the winter, December, is also a fresh month in Calistoga, California, with an average temperature fluctuating between 39.4°F (4.1°C) and 54.7°F (12.6°C).

Temperature

Calistoga's coldest weather arrives in December, when temperatures average a high of 54.7°F (12.6°C) and a low of 39.4°F (4.1°C).

Humidity

In Calistoga, the average relative humidity in December is 73%.

Rainfall

In Calistoga, during December, the rain falls for 11.2 days and regularly aggregates up to 3.15" (80mm) of precipitation. Throughout the year, there are 77 rainfall days, and 17.05" (433mm) of precipitation is accumulated.

Snowfall

January, March through December are months without snowfall in Calistoga.

Daylight

December has the shortest days of the year, with an average of 9h and 30min of daylight.
On the first day of December, sunrise is at 7:09 am and sunset at 4:49 pm. On the last day of the month, sunrise is at 7:27 am and sunset at 4:59 pm PST.

Sunshine

With an average of 5.5h of sunshine, December has the least sunshine of the year.

UV index

With an average maximum UV index of 2, December is the month with the lowest UV index. A UV Index estimate of 2, and below, represents a low threat to health from unprotected exposure to Sun's UV rays for ordinary individuals.
Note: In December, a daily UV index of 2 turns into the following recommendations:
Extended exposure to the sun should always be avoided by children, infants, and those with sensitive skin. Considering the harmful UV rays from the Sun during midday, it's essential to reduce exposure. Select sunglasses that boast both UVA and UVB protection to limit the adverse effects of the sun on the eyes.
Updated: Jul 21, 2024
Published by: Weather U.S. | About Us
Data Sources | Weather Forecasting & Climate

Frequently asked questions

What time of the year is the coldest?

December stands out as Calistoga's coldest month, with an average high-temperature of 54.7°F (12.6°C) and a low-temperature of 39.4°F (4.1°C).

What is the average December temperature in Calistoga?

During December, Calistoga experiences an average high-temperature of 54.7°F (12.6°C) and a low-temperature of 39.4°F (4.1°C). The average heat index (a.k.a. 'apparent temperature', 'felt air temperature'), which factors the actual air temperature with the relative humidity, in September is evaluated at 86°F (30°C).

What is the average humidity in December?

In December, the average relative humidity is 73%.

How much does it rain in December?

In Calistoga, in December, it is raining for 11.2 days, with typically 3.15" (80mm) of accumulated precipitation.

When it does not snow?

January, March through December are months without snowfall in Calistoga.

What is the month with the shortest days in Calistoga?

December has the shortest days of the year, with an average of 9h and 30min of daylight.

How many hours of daylight does Calistoga have in December?

In December, the average day length is 9h and 32min.

When is the sunrise / sunset in December?

On the first day of December, sunrise is at 7:09 am and sunset at 4:49 pm. On the last day of the month, sunrise is at 7:27 am and sunset at 4:59 pm PST.

What is the month with the least sunshine?

December has the least sunshine of the year, with an average of 5.5h of sunshine.

How long on average sun shines in December?

In Calistoga, California, the average sunshine duration in December is 5.5h.

What is the month with the lowest UV index?

December is the month with the lowest UV index, with an average maximum UV index of 2.

What is the UV index intensity in December?

In December, the average daily maximum UV index is 2. A UV Index of 2, and less, symbolizes a minimal health vulnerability from exposure to Sun's UV rays.
Average max. wind speed
Average humidity
Average rainfall days
Average snowfall
Average snowfall days
Average daylight
Average sunshine
Average sunshine days
Average UV index
Average cloud cover
Average visibility

Average temperature in December
Calistoga, CA

Average temperature in December - Calistoga, CA
  • Average high temperature in December: 54.7°F

The warmest month (with the highest average high temperature) is August (87.8°F).
The month with the lowest average high temperature is December (54.7°F).

  • Average low temperature in December: 39.4°F

The month with the highest average low temperature is July (55.4°F).
The coldest month (with the lowest average low temperature) is December (39.4°F).

Average pressure in December
Calistoga, CA

Average pressure in December - Calistoga, CA
  • Average pressure in December: 30.11"Hg

The month with the highest atmospheric pressure is January (30.13"Hg).
The months with the lowest atmospheric pressure are June, August and September (29.91"Hg).

Average wind speed in December
Calistoga, CA

Average wind speed in December - Calistoga, CA
  • Average wind speed in December: 4.5mph

The windiest months (with the highest average wind speed) are April and May (5.7mph).
The calmest month (with the lowest average wind speed) is November (4.3mph).

Average humidity in December
Calistoga, CA

Average humidity in December - Calistoga, CA
  • Average humidity in December: 73%

The month with the highest relative humidity is March (75%).
The month with the lowest relative humidity is September (53%).

Average rainfall in December
Calistoga, CA

Average rainfall in December - Calistoga, CA
  • Average rainfall in December: 3.15"

The wettest month (with the highest rainfall) is February (3.78").
The driest months (with the least rainfall) are July and August (0.04").

Average rainfall days in December
Calistoga, CA

Average rainfall days in December - Calistoga, CA
  • Average rainfall days in December: 11.2 days

The month with the highest number of rainy days is March (13.6 days).
The month with the least rainy days is August (0.8 days).

Average snowfall in December
Calistoga, CA

Average snowfall in December - Calistoga, CA
  • Average snowfall in December: 0"

The month with the highest snowfall is February (0.04").
The months with the least snowfall are January, March, April, May, June, July, August, September, October, November and December (0").

Average snowfall days in December
Calistoga, CA

Average snowfall days in December - Calistoga, CA
  • Average snowfall days in December: 0 days

The months with the highest number of snowfall days are February and March (0.1 days).
The months with the least snowfall days are January, April, May, June, July, August, September, October, November and December (0 days).

Average daylight in December /
Average sunshine in December
Calistoga, CA

Average daylight in December / Average sunshine in December - Calistoga, CA
  • Average daylight in December: 9h and 3min

The month with the longest days is June (Average daylight: 14h and 48min).
The month with the shortest days is December (Average daylight: 9h and 30min).

  • Average sunshine in December: 5h and 3min

The month with the most sunshine is July (Average sunshine: 12h and 0min).
The month with the least sunshine is December (Average sunshine: 5h and 30min).

Average sunshine days in December
Calistoga, CA

Average sunshine days in December - Calistoga, CA
  • Average sunshine days in December: 18.9 days

The month with the most sunshine days is July (29.8 days).
The month with the least sunshine days is March (15.8 days).

Average UV index in December
Calistoga, CA

Average UV index in December - Calistoga, CA
  • Average UV index in December: 2

The months with the highest UV index are June, July and August (UV index 6).
The month with the lowest UV index is December (UV index 2).

Average cloud cover in December
Calistoga, CA

Average cloud cover in December - Calistoga, CA
  • Average cloud cover in December: 40

The month with the most cloud cover is March (Cloud cover 42).
The month with the least cloud cover is July (Cloud cover 5).

Average visibility in December
Calistoga, CA

Average visibility in December - Calistoga, CA
  • Average visibility in December: 6mi

The months with the highest visibility are January, February, April, May, June, July, August, September, October, November and December (6mi).
The month with the lowest visibility is March (5mi).

Calistoga, California, USA

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