December weather forecast
Whitethorn, CA

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Weather in December

The first month of the winter, December, is also a fresh month in Whitethorn, California, with an average temperature varying between 53.4°F (11.9°C) and 43.9°F (6.6°C).

Temperature

December is Whitethorn's coldest month, registering average high temperatures of 53.4°F (11.9°C) and lows of 43.9°F (6.6°C).

Humidity

In Whitethorn, the average relative humidity in December is 78%.

Rainfall

The month with the most rainfall in Whitethorn is December, when the rain falls for 14.8 days and typically aggregates up to 5.31" (135mm) of precipitation.

Snowfall

January, March through December are months without snowfall.

Daylight

With an average of 9h and 24min of daylight, December has the shortest days of the year in Whitethorn.
On the first day of the month, sunrise is at 7:19 am and sunset at 4:50 pm. On the last day of December, in Whitethorn, sunrise is at 7:37 am and sunset at 5:00 pm PST.

Sunshine

December has the least sunshine of the year, with an average of 5h of sunshine.

UV index

The months with the lowest UV index in Whitethorn are January through March, November and December, with an average maximum UV index of 3. A UV Index value of 3 to 5 symbolizes a moderate health risk from unprotected exposure to Sun's UV rays for ordinary individuals.
Note: The maximum UV index, 3 during December, leads to the following recommendations:
Preventative actions are necessary - The mandate to avoid skin and eye damage is in place. Considering the strength of solar radiation at midday, one should avoid direct Sun exposure. On bright days sunglasses that block both UVA and UVB rays should be worn. A hat with a wide brim is extremely helpful, as it can prevent roughly 50% of UV radiation from reaching the eyes.

Frequently asked questions

What time of the year is the coldest in Whitethorn?

Whitethorn's December weather, with an average high temperature of 53.4°F (11.9°C) and an average low temperature of 43.9°F (6.6°C), tends to be the coldest of the year.

What is the usual temperature for Whitethorn in December?

The average high-temperature and low-temperature in Whitethorn during December are 53.4°F (11.9°C) and 43.9°F (6.6°C) respectively.

What is the average humidity in December in Whitethorn?

The average relative humidity in December in Whitethorn, California, is 78%.

What is the wettest month in Whitethorn?

December is the month with the most rainfall. Rain falls for 14.8 days and accumulates 5.31" (135mm) of precipitation.

How much does it rain in Whitethorn in December?

In December, in Whitethorn, California, the rain falls for 14.8 days. Throughout December, 5.31" (135mm) of precipitation is accumulated.

When it does not snow in Whitethorn?

In Whitethorn, California, snow does not fall in January, March through December.

What is the month with the shortest days in Whitethorn?

December has the shortest days of the year, with an average of 9h and 24min of daylight.

What is the average length of the day in December in Whitethorn?

The average day length in December in Whitethorn is 9h and 23min.

What time are sunrise and sunset in December in Whitethorn?

In December, on the first day of the month, sunrise is at 7:19 am and sunset at 4:50 pm. On the last day of the month, in Whitethorn, California, sunrise is at 7:37 am and sunset at 5:00 pm PST.

What is the month with the least sunshine in Whitethorn?

With an average of 5h of sunshine, December has the least sunshine of the year.

How many hours of sunshine does Whitethorn have in December?

In December, the average sunshine duration is 5h.

What are the months with the lowest UV index in Whitethorn?

January through March, November and December, with an average maximum UV index of 3, are months with the lowest UV index in Whitethorn, California.

How high is the UV index in December in Whitethorn?

In Whitethorn, California, the average daily maximum UV index in December is 3. A UV Index reading of 3 to 5 represents a moderate health threat from exposure to the Sun's UV radiation.
Average humidity
Average rainfall days
Average snowfall days
Average daylight
Average sunshine
Average sunshine days
Average UV index
Average cloud cover
Average visibility

Average temperature in December
Whitethorn, CA

Average temperature in December - Whitethorn, CA
  • Average high temperature in December: 53.4°F

The warmest month (with the highest average high temperature) is September (69.8°F).
The month with the lowest average high temperature is December (53.4°F).

  • Average low temperature in December: 43.9°F

The months with the highest average low temperature are July, August and September (54.3°F).
The coldest month (with the lowest average low temperature) is February (43.5°F).

Average pressure in December
Whitethorn, CA

Average pressure in December - Whitethorn, CA
  • Average pressure in December: 30.1"Hg

The month with the highest atmospheric pressure is January (30.13"Hg).
The months with the lowest atmospheric pressure are August and September (29.95"Hg).

Average wind speed in December
Whitethorn, CA

Average wind speed in December - Whitethorn, CA
  • Average wind speed in December: 8.6mph

The windiest month (with the highest average wind speed) is June (10.6mph).
The calmest months (with the lowest average wind speed) are January and August (7.8mph).

Average humidity in December
Whitethorn, CA

Average humidity in December - Whitethorn, CA
  • Average humidity in December: 78%

The month with the highest relative humidity is March (81%).
The month with the lowest relative humidity is September (72%).

Average rainfall in December
Whitethorn, CA

Average rainfall in December - Whitethorn, CA
  • Average rainfall in December: 5.31"

The wettest month (with the highest rainfall) is December (5.31").
The driest month (with the least rainfall) is July (0.08").

Average rainfall days in December
Whitethorn, CA

Average rainfall days in December - Whitethorn, CA
  • Average rainfall days in December: 14.8 days

The month with the highest number of rainy days is March (16.4 days).
The month with the least rainy days is August (1.8 days).

Average snowfall days in December
Whitethorn, CA

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

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

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

Average daylight in December / Average sunshine in December - Whitethorn, CA
  • Average daylight in December: 9h and 2min

The month with the longest days is June (Average daylight: 15h and 0min).
The month with the shortest days is December (Average daylight: 9h and 24min).

  • Average sunshine in December: 5h and 0min

The months with the most sunshine are July and August (Average sunshine: 11h and 42min).
The month with the least sunshine is December (Average sunshine: 5h and 0min).

Average sunshine days in December
Whitethorn, CA

Average sunshine days in December - Whitethorn, CA
  • Average sunshine days in December: 15.5 days

The month with the most sunshine days is July (28.4 days).
The month with the least sunshine days is March (13.1 days).

Average UV index in December
Whitethorn, CA

Average UV index in December - Whitethorn, CA
  • Average UV index in December: 3

The months with the highest UV index are June, July and August (UV index 5).
The months with the lowest UV index are January, February, March, November and December (UV index 3).

Average cloud cover in December
Whitethorn, CA

Average cloud cover in December - Whitethorn, CA
  • Average cloud cover in December: 44

The month with the most cloud cover is March (Cloud cover 46).
The month with the least cloud cover is July (Cloud cover 10).

Average visibility in December
Whitethorn, CA

Average visibility in December - Whitethorn, 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).

Whitethorn, California, USA

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