December weather forecast
San Fernando, CA

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Weather in December

The first month of the winter, December, is still a refreshing month in San Fernando, California, with an average temperature fluctuating between 61.7°F (16.5°C) and 46.2°F (7.9°C).

Temperature

San Fernando's December weather reaches an average high of 61.7°F (16.5°C) and an average low of 46.2°F (7.9°C), making it the coldest month.

Humidity

In December, the average relative humidity in San Fernando is 52%.

Rainfall

In San Fernando, California, in December, it is raining for 5 days, with typically 1.42" (36mm) of accumulated precipitation. Throughout the year, there are 39.8 rainfall days, and 7.52" (191mm) of precipitation is accumulated.

Daylight

With an average of 9h and 54min of daylight, December has the shortest days of the year.
On the first day of the month, sunrise is at 6:42 am and sunset at 4:43 pm. On the last day of December, in San Fernando, California, sunrise is at 6:59 am and sunset at 4:54 pm PST.

Sunshine

January, February and December, with an average of 6.8h of sunshine, are months with the least sunshine in San Fernando.

UV index

The month with the lowest UV index in San Fernando is December, with an average maximum UV index of 3. A UV Index estimate of 3 to 5 represents a moderate health risk from exposure to the Sun's UV rays for average individuals.
Note: The UV index of 3 during December translates into the following guidance:
Act with care - The suggestion to avoid sunburn is emphasized. UV radiation from the Sun is most dangerous during midday; take precautions and seek shade. Outfit yourself in sun-safe attire, like long sleeves, pants, a hat, and UV-blocking sunglasses.
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Frequently asked questions

What time of the year is the coldest in San Fernando?

The coldest period in San Fernando, California, is December, when temperatures fluctuate between an average high of 61.7°F (16.5°C) and a low of 46.2°F (7.9°C).

What is the temperature in December in San Fernando?

In December, in San Fernando, the average high-temperature is 61.7°F (16.5°C), and the average low-temperature is 46.2°F (7.9°C). In September, the average heat index (a.k.a. 'felt air temperature', 'feels like'), which combines relative humidity and air temperature, is estimated at 84.2°F (29°C).

What is the average humidity in December in San Fernando?

The average relative humidity in December in San Fernando, California, is 52%.

How many days does it rain in December in San Fernando?

In San Fernando, during December, the rain falls for 5 days and regularly aggregates up to 1.42" (36mm) of precipitation.

What is the month with the shortest days in San Fernando?

December has the shortest days of the year in San Fernando, California, with an average of 9h and 54min of daylight.

What is the average length of the day in December in San Fernando?

The average day length in December is 9h and 55min.

When are sunrise and sunset in December in San Fernando?

In December, on the first day of the month, sunrise is at 6:42 am and sunset at 4:43 pm. On the last day of the month, in San Fernando, sunrise is at 6:59 am and sunset at 4:54 pm PST.

What are the months with the least sunshine in San Fernando?

January, February and December, with an average of 6.8h of sunshine, are months with the least sunshine in San Fernando.

How long on average sun shines in December in San Fernando?

The average sunshine duration in December in San Fernando is 6.8h.

When is the lowest UV index in San Fernando?

The month with the lowest UV index in San Fernando is December, with an average maximum UV index of 3.

What is the UV index intensity in December in San Fernando?

In San Fernando, California, the average daily maximum UV index in December is 3. A UV Index value of 3 to 5 symbolizes a moderate vulnerability from exposure to Sun's UV rays.
Average humidity
Average rainfall days
Average daylight
Average sunshine
Average sunshine days
Average UV index
Average cloud cover
Average visibility

Average temperature in December
San Fernando, CA

Average temperature in December - San Fernando, CA
  • Average high temperature in December: 61.7°F

The warmest month (with the highest average high temperature) is August (85.8°F).
The month with the lowest average high temperature is December (61.7°F).

  • Average low temperature in December: 46.2°F

The month with the highest average low temperature is August (64.9°F).
The coldest month (with the lowest average low temperature) is December (46.2°F).

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Average pressure in December
San Fernando, CA

Average pressure in December - San Fernando, CA
  • Average pressure in December: 30.08"Hg

The month with the highest atmospheric pressure is January (30.11"Hg).
The month with the lowest atmospheric pressure is June (29.89"Hg).

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Average wind speed in December
San Fernando, CA

Average wind speed in December - San Fernando, CA
  • Average wind speed in December: 6.2mph

The windiest months (with the highest average wind speed) are January and December (6.2mph).
The calmest month (with the lowest average wind speed) is September (4.5mph).

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Average humidity in December
San Fernando, CA

Average humidity in December - San Fernando, CA
  • Average humidity in December: 52%

The month with the highest relative humidity is June (58%).
The month with the lowest relative humidity is November (47%).

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Average rainfall in December
San Fernando, CA

Average rainfall in December - San Fernando, CA
  • Average rainfall in December: 1.42"

The wettest month (with the highest rainfall) is February (1.54").
The driest month (with the least rainfall) is June (0").

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Average rainfall days in December
San Fernando, CA

Average rainfall days in December - San Fernando, CA
  • Average rainfall days in December: 5 days

The month with the highest number of rainy days is March (6.3 days).
The month with the least rainy days is June (0.8 days).

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Average daylight in December /
Average sunshine in December
San Fernando, CA

Average daylight in December / Average sunshine in December - San Fernando, CA
  • Average daylight in December: 9h and 5min

The month with the longest days is June (Average daylight: 14h and 24min).
The month with the shortest days is December (Average daylight: 9h and 54min).

  • Average sunshine in December: 6h and 5min

The months with the most sunshine are June and July (Average sunshine: 12h and 6min).
The months with the least sunshine are January, February and December (Average sunshine: 6h and 48min).

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Average sunshine days in December
San Fernando, CA

Average sunshine days in December - San Fernando, CA
  • Average sunshine days in December: 25.2 days

The month with the most sunshine days is May (28.8 days).
The month with the least sunshine days is February (22.9 days).

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Average UV index in December
San Fernando, CA

Average UV index in December - San Fernando, CA
  • Average UV index in December: 3

The months with the highest UV index are June, July, August and September (UV index 6).
The month with the lowest UV index is December (UV index 3).

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Average cloud cover in December
San Fernando, CA

Average cloud cover in December - San Fernando, CA
  • Average cloud cover in December: 21

The month with the most cloud cover is March (Cloud cover 22).
The month with the least cloud cover is August (Cloud cover 4).

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Average visibility in December
San Fernando, CA

Average visibility in December - San Fernando, 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).

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San Fernando, California, USA

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