Contents
- Weather in December
- Frequently asked questions
- Average temperature in December
- Average pressure in December
- Average wind speed in December
- Average humidity in December
- Average rainfall in December
- Average rainfall days in December
- Average snowfall in December
- Average snowfall days in December
- Average daylight in December
- Average sunshine in December
- Average sunshine days in December
- Average UV index in December
- Average cloud cover in December
- Average visibility in December
Weather in December
Temperature
December is the month when Vallecito experiences its coldest temperatures, averaging a high of 53.2°F (11.8°C) and a low of 37.8°F (3.2°C).Humidity
The average relative humidity in December in Vallecito is 67%.Rainfall
In Vallecito, during December, the rain falls for 9.5 days and regularly aggregates up to 3.9" (99mm) of precipitation. In Vallecito, during the entire year, the rain falls for 74.4 days and collects up to 22.87" (581mm) of precipitation.Snowfall
January through March, November and December are months with snowfall in Vallecito. In Vallecito, in December, during 0.2 snowfall days, 0.39" (10mm) of snow is typically accumulated. In Vallecito, during the entire year, snow falls for 2.2 days and aggregates up to 4.09" (104mm) of snow.Daylight
The month with the shortest days in Vallecito is December, with an average of 9h and 36min of daylight.On the first day of the month, sunrise is at 7:00 am and sunset at 4:42 pm. On the last day of December, sunrise is at 7:18 am and sunset at 4:52 pm PST.
Sunshine
With an average of 5.8h of sunshine, December has the least sunshine of the year in Vallecito.UV index
In December, the average daily maximum UV index is 3. A UV Index value of 3 to 5 symbolizes a moderate threat to health from unprotected exposure to Sun's UV rays for the ordinary person.Note: The maximum daily UV index of 3 during December translates into the following directions:
Be vigilant - A duty to shield skin and eyes from injury exists. Considering the harmful UV rays from the Sun during midday, it's essential to reduce exposure. A wide-brimmed hat provides unparalleled sun protection for sensitive areas like the eyes, ears, and neck. Notice! The UV radiation of the Sun can be intensified nearly twofold due to the reflective quality of snow.
Frequently asked questions
What month is the coldest in Vallecito?
What are December temperatures in Vallecito?
What is the average humidity in December in Vallecito?
How many days does it rain in December in Vallecito?
How much does it snow in Vallecito in December?
What is the month with the shortest days in Vallecito?
What is the average length of the day in December in Vallecito?
When is the sunrise / sunset in December in Vallecito?
What is the month with the least sunshine in Vallecito?
How many hours of sunshine does Vallecito have in December?
What is the UV index reading in December in Vallecito?
Average temperature in December
Vallecito, CA
- Average high temperature in December: 53.2°F
The warmest month (with the highest average high temperature) is July (91.9°F).
The month with the lowest average high temperature is December (53.2°F).
- Average low temperature in December: 37.8°F
The month with the highest average low temperature is July (62.6°F).
The coldest month (with the lowest average low temperature) is December (37.8°F).
Average pressure in December
Vallecito, CA
- Average pressure in December: 30.13"Hg
The month with the highest atmospheric pressure is January (30.16"Hg).
The month with the lowest atmospheric pressure is June (29.91"Hg).
Average wind speed in December
Vallecito, CA
- Average wind speed in December: 4.8mph
The windiest month (with the highest average wind speed) is February (5.7mph).
The calmest month (with the lowest average wind speed) is November (4.7mph).
Average humidity in December
Vallecito, CA
- Average humidity in December: 67%
The month with the highest relative humidity is March (71%).
The months with the lowest relative humidity are July and August (34%).
Average rainfall in December
Vallecito, CA
- Average rainfall in December: 3.9"
The wettest month (with the highest rainfall) is March (4.76").
The driest months (with the least rainfall) are July and August (0.04").
Average rainfall days in December
Vallecito, CA
- Average rainfall days in December: 9.5 days
The month with the highest number of rainy days is March (13 days).
The month with the least rainy days is August (1.2 days).
Average snowfall in December
Vallecito, CA
- Average snowfall in December: 0.39"
The month with the highest snowfall is February (2.32").
The months with the least snowfall are April, May, June, July, August, September and October (0").
Average snowfall days in December
Vallecito, CA
- Average snowfall days in December: 0.2 days
The month with the highest number of snowfall days is February (1.2 days).
The months with the least snowfall days are April, May, June, July, August, September and October (0 days).
Average daylight in December /
Average sunshine in December
Vallecito, CA
- Average daylight in December: 9h and 4min
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 36min).
- Average sunshine in December: 5h and 5min
The month with the most sunshine is July (Average sunshine: 12h and 12min).
The month with the least sunshine is December (Average sunshine: 5h and 48min).
Average sunshine days in December
Vallecito, CA
- Average sunshine days in December: 20.6 days
The month with the most sunshine days is July (29.1 days).
The month with the least sunshine days is March (16.8 days).
Average UV index in December
Vallecito, CA
- Average UV index in December: 3
The months with the highest UV index are June and July (UV index 7).
The month with the lowest UV index is November (UV index 2).
Average cloud cover in December
Vallecito, CA
- Average cloud cover in December: 33
The month with the most cloud cover is March (Cloud cover 37).
The month with the least cloud cover is July (Cloud cover 4).
Average visibility in December
Vallecito, CA
- Average visibility in December: 6mi
The months with the highest visibility are January, February, March, April, May, June, July, August, September, October, November and December (6mi).
The months with the lowest visibility are January, February, March, April, May, June, July, August, September, October, November and December (6mi).
Vallecito, California, USA
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