December weather forecast
Glenhaven, CA

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Weather in December

The first month of the winter, December, is also a fresh month in Glenhaven, California, with an average temperature fluctuating between 52.3°F (11.3°C) and 37.2°F (2.9°C).

Temperature

December is the month that records the lowest temperatures, with averages ranging from a high of 52.3°F (11.3°C) to a low of 37.2°F (2.9°C).

Humidity

In Glenhaven, the average relative humidity in December is 73%.

Rainfall

In December, in Glenhaven, California, the rain falls for 12.3 days. Throughout December, 3.7" (94mm) of precipitation is accumulated. In Glenhaven, during the entire year, the rain falls for 92 days and collects up to 21.02" (534mm) of precipitation.

Snowfall

Months with snowfall in Glenhaven are January through March, November and December. In Glenhaven, during December, snow falls for 0.2 days and regularly aggregates up to 0.08" (2mm) of snow. Throughout the year, there are 2 snowfall days, and 1.34" (34mm) of snow is accumulated.

Daylight

With an average of 9h and 30min of daylight, December has the shortest days of the year in Glenhaven.
On the first day of December, sunrise is at 7:11 am and sunset at 4:48 pm. On the last day of the month, sunrise is at 7:29 am and sunset at 4:58 pm PST.

Sunshine

With an average of 5.3h of sunshine, December has the least sunshine of the year in Glenhaven.

UV index

The months with the lowest UV index are January, February, November and December, with an average maximum UV index of 3. A UV Index value of 3 to 5 symbolizes a medium health hazard from unprotected exposure to Sun's UV rays for the average person.
Note: In December, a daily UV index of 3 turns into the following recommendations:
Heed the precautions - It is counselled to guard against solar damage. Avoiding the Sun's peak radiation during midday hours is essential for health and safety. A wide-brimmed hat is a shield, deflecting up to 50% of harmful UV radiation from eyes. Be attentive! The reflective property of snow can nearly double the Sun's UV radiation.
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Frequently asked questions

What month is the coldest in Glenhaven?

December is the coldest month of the year in Glenhaven, registering average temperatures as high as 52.3°F (11.3°C) and as low as 37.2°F (2.9°C).

What are the temperatures in Glenhaven in December?

In Glenhaven, 52.3°F (11.3°C) is the average high-temperature and 37.2°F (2.9°C) is the average low-temperature during December. The average heat index (a.k.a. 'felt air temperature', 'feels like'), which factors the actual air temperature with the relative humidity, in September is appraised at 84.2°F (29°C).

What is the average humidity in December in Glenhaven?

The average relative humidity in December in Glenhaven, California, is 73%.

How many days does it rain in December in Glenhaven?

In Glenhaven, during December, the rain falls for 12.3 days and regularly aggregates up to 3.7" (94mm) of precipitation.

How much does it snow in Glenhaven in December?

In Glenhaven, California, during December, snow falls for 0.2 days and regularly aggregates up to 0.08" (2mm) of snow.

What is the month with the shortest days in Glenhaven?

December has the shortest days of the year in Glenhaven, California, with an average of 9h and 30min of daylight.

How many hours of daylight does Glenhaven have in December?

In Glenhaven, California, the average day length in December is 9h and 29min.

What time are sunrise and sunset in December in Glenhaven?

In December, on the first day of the month, sunrise is at 7:11 am and sunset at 4:48 pm. On the last day of the month, sunrise is at 7:29 am and sunset at 4:58 pm PST.

What is the month with the least sunshine in Glenhaven?

With an average of 5.3h of sunshine, December has the least sunshine of the year.

How many hours of sunshine does Glenhaven have in December?

The average sunshine duration in December is 5.3h.

When is the lowest UV index in Glenhaven?

The months with the lowest UV index in Glenhaven, California, are January, February, November and December, with an average maximum UV index of 3.

How high is the UV index in December in Glenhaven?

The average daily maximum UV index in December in Glenhaven, California, is 3. A UV Index estimate of 3 to 5 represents a medium hazard to health from exposure to Sun's UV rays.
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
Glenhaven, CA

Average temperature in December - Glenhaven, CA
  • Average high temperature in December: 52.3°F

The warmest month (with the highest average high temperature) is July (89.6°F).
The month with the lowest average high temperature is December (52.3°F).

  • Average low temperature in December: 37.2°F

The month with the highest average low temperature is July (57.7°F).
The coldest month (with the lowest average low temperature) is December (37.2°F).

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Average pressure in December
Glenhaven, CA

Average pressure in December - Glenhaven, CA
  • Average pressure in December: 30.11"Hg

The month with the highest atmospheric pressure is January (30.14"Hg).
The months with the lowest atmospheric pressure are June and August (29.91"Hg).

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Average wind speed in December
Glenhaven, CA

Average wind speed in December - Glenhaven, CA
  • Average wind speed in December: 4.4mph

The windiest month (with the highest average wind speed) is April (5.3mph).
The calmest month (with the lowest average wind speed) is November (4.1mph).

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Average humidity in December
Glenhaven, CA

Average humidity in December - Glenhaven, CA
  • Average humidity in December: 73%

The month with the highest relative humidity is March (75%).
The month with the lowest relative humidity is July (47%).

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Average rainfall in December
Glenhaven, CA

Average rainfall in December - Glenhaven, CA
  • Average rainfall in December: 3.7"

The wettest month (with the highest rainfall) is February (4.06").
The driest month (with the least rainfall) is July (0.04").

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Average rainfall days in December
Glenhaven, CA

Average rainfall days in December - Glenhaven, CA
  • Average rainfall days in December: 12.3 days

The month with the highest number of rainy days is March (15.9 days).
The months with the least rainy days are July and August (1.3 days).

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Average snowfall in December
Glenhaven, CA

Average snowfall in December - Glenhaven, CA
  • Average snowfall in December: 0.08"

The months with the highest snowfall are January and February (0.47").
The months with the least snowfall are April, May, June, July, August, September and October (0").

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Average snowfall days in December
Glenhaven, CA

Average snowfall days in December - Glenhaven, CA
  • Average snowfall days in December: 0.2 days

The month with the highest number of snowfall days is February (0.9 days).
The months with the least snowfall days are April, May, June, July, August, September and October (0 days).

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

Average daylight in December / Average sunshine in December - Glenhaven, CA
  • Average daylight in December: 9h and 3min

The month with the longest days is June (Average daylight: 14h and 54min).
The month with the shortest days is December (Average daylight: 9h and 30min).

  • Average sunshine in December: 5h and 2min

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 18min).

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Average sunshine days in December
Glenhaven, CA

Average sunshine days in December - Glenhaven, CA
  • Average sunshine days in December: 17.6 days

The months with the most sunshine days are July and August (28.3 days).
The month with the least sunshine days is March (13.7 days).

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Average UV index in December
Glenhaven, CA

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

The months with the highest UV index are June, July and August (UV index 6).
The months with the lowest UV index are January, February, November and December (UV index 3).

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Average cloud cover in December
Glenhaven, CA

Average cloud cover in December - Glenhaven, CA
  • Average cloud cover in December: 42

The month with the most cloud cover is March (Cloud cover 44).
The months with the least cloud cover are July and August (Cloud cover 5).

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Average visibility in December
Glenhaven, CA

Average visibility in December - Glenhaven, CA
  • Average visibility in December: 5mi

The months with the highest visibility are January, February, April, May, June, July, August, September, October and November (6mi).
The months with the lowest visibility are March and December (5mi).

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Glenhaven, California, USA

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