December weather forecastCalistoga, CA
December
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.
Published by: Weather U.S. | About Us
Data Sources | Weather Forecasting & Climate
Frequently asked questions
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: 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: 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: 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: 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: 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: 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: 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: 9h and 30min
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 30min
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: 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: 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: 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: 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).
