December weather forecast
Tierrasanta, CA

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Weather in December

The first month of the winter, December, is still a refreshing month in Tierrasanta, California, with an average temperature ranging between max 63.5°F (17.5°C) and min 51.3°F (10.7°C).

Temperature

In Tierrasanta, December is the coldest month, with temperatures averaging a high of 63.5°F (17.5°C) and a low of 51.3°F (10.7°C).

Humidity

The average relative humidity in December in Tierrasanta is 61%.

Rainfall

In Tierrasanta, California, in December, it is raining for 5.7 days, with typically 1.3" (33mm) of accumulated precipitation. In Tierrasanta, during the entire year, the rain falls for 57.9 days and collects up to 7.48" (190mm) of precipitation.

Daylight

December has the shortest days of the year, with an average of 10h and 0min of daylight.
On the first day of the month, sunrise is at 6:33 am and sunset at 4:41 pm. On the last day of December, in Tierrasanta, sunrise is at 6:50 am and sunset at 4:52 pm PST.

Sunshine

December has the least sunshine of the year, with an average of 6.8h of sunshine.

UV index

January through March, November and December, with an average maximum UV index of 4, are months with the lowest UV index. A UV Index value of 3 to 5 symbolizes a medium vulnerability from unprotected exposure to Sun's UV rays for ordinary individuals.
Note: A daily high UV index of 4 in December leads to these guidelines:
Prioritize safety - The need to safeguard skin and eyes from harm is emphasized. The midday Sun can be harmful due to its potent UV radiation; seek shade and reduce exposure. Safeguard your eyes, ears, and face from sun rays with the aid of a wide-brim hat.

Frequently asked questions

What is the coldest month?

December, known for its average high temperature of 63.5°F (17.5°C) and an average low temperature of 51.3°F (10.7°C), is the coldest month.

What is the average December temperature?

Tierrasanta in December has an average high-temperature of 63.5°F (17.5°C) and an average low-temperature of 51.3°F (10.7°C).

What is the average humidity in December?

In December, the average relative humidity is 61%.

How much does it rain in December?

In December, the rain falls for 5.7 days. Throughout December, 1.3" (33mm) of precipitation is accumulated.

What is the month with the shortest days?

The month with the shortest days is December, with an average of 10h and 0min of daylight.

How many hours of daylight does Tierrasanta have in December?

The average day length in December is 10h and 2min.

When are sunrise and sunset in December?

On the first day of December, sunrise is at 6:33 am and sunset at 4:41 pm. On the last day of the month, sunrise is at 6:50 am and sunset at 4:52 pm PST.

What is the month with the least sunshine?

December has the least sunshine of the year, with an average of 6.8h of sunshine.

How long on average sun shines in December?

In Tierrasanta, the average sunshine duration in December is 6.8h.

What are the months with the lowest UV index?

January through March, November and December, with an average maximum UV index of 4, are months with the lowest UV index.

What is the UV index intensity in December?

In December, the average daily maximum UV index is 4. A UV Index of 3 to 5 symbolizes a moderate vulnerability from unprotected exposure to UV radiation.
Average humidity
Average rainfall days
Average daylight
Average sunshine
Average sunshine days
Average UV index
Average cloud cover
Average visibility

Average temperature in December
Tierrasanta, CA

Average temperature in December - Tierrasanta, CA
  • Average high temperature in December: 63.5°F

The warmest month (with the highest average high temperature) is August (79.3°F).
The month with the lowest average high temperature is December (63.5°F).

  • Average low temperature in December: 51.3°F

The month with the highest average low temperature is August (65.8°F).
The coldest month (with the lowest average low temperature) is February (50.2°F).

Average pressure in December
Tierrasanta, CA

Average pressure in December - Tierrasanta, CA
  • Average pressure in December: 30.06"Hg

The month with the highest atmospheric pressure is January (30.09"Hg).
The months with the lowest atmospheric pressure are June and September (29.88"Hg).

Average wind speed in December
Tierrasanta, CA

Average wind speed in December - Tierrasanta, CA
  • Average wind speed in December: 5.2mph

The windiest month (with the highest average wind speed) is April (6mph).
The calmest month (with the lowest average wind speed) is October (4.8mph).

Average humidity in December
Tierrasanta, CA

Average humidity in December - Tierrasanta, CA
  • Average humidity in December: 61%

The months with the highest relative humidity are May and June (71%).
The month with the lowest relative humidity is November (57%).

Average rainfall in December
Tierrasanta, CA

Average rainfall in December - Tierrasanta, CA
  • Average rainfall in December: 1.3"

The wettest month (with the highest rainfall) is February (1.46").
The driest month (with the least rainfall) is June (0.12").

Average rainfall days in December
Tierrasanta, CA

Average rainfall days in December - Tierrasanta, CA
  • Average rainfall days in December: 5.7 days

The month with the highest number of rainy days is March (7.1 days).
The month with the least rainy days is June (2.2 days).

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

Average daylight in December / Average sunshine in December - Tierrasanta, CA
  • Average daylight in December: 10h and 0min

The month with the longest days is June (Average daylight: 14h and 18min).
The month with the shortest days is December (Average daylight: 10h and 0min).

  • Average sunshine in December: 6h and 5min

The month with the most sunshine is July (Average sunshine: 12h and 0min).
The month with the least sunshine is December (Average sunshine: 6h and 48min).

Average sunshine days in December
Tierrasanta, CA

Average sunshine days in December - Tierrasanta, CA
  • Average sunshine days in December: 22.8 days

The month with the most sunshine days is January (24.8 days).
The month with the least sunshine days is February (20.2 days).

Average UV index in December
Tierrasanta, CA

Average UV index in December - Tierrasanta, CA
  • Average UV index in December: 4

The months with the highest UV index are July, August and September (UV index 6).
The months with the lowest UV index are January, February, March, November and December (UV index 4).

Average cloud cover in December
Tierrasanta, CA

Average cloud cover in December - Tierrasanta, CA
  • Average cloud cover in December: 23

The months with the most cloud cover are March and December (Cloud cover 23).
The month with the least cloud cover is August (Cloud cover 8).

Average visibility in December
Tierrasanta, CA

Average visibility in December - Tierrasanta, 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).

Tierrasanta, California, USA

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