December weather forecast
Whittier, CA

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Weather in December

The first month of the winter, December, is still a refreshing month in Whittier, California, with an average temperature fluctuating between 64.9°F (18.3°C) and 50°F (10°C).

Temperature

Whittier's coldest weather arrives in December, when temperatures average a high of 64.9°F (18.3°C) and a low of 50°F (10°C).

Humidity

The average relative humidity in December is 52%.

Rainfall

The month with the most rainfall is December, when the rain falls for 4.8 days and typically aggregates up to 1.14" (29mm) of precipitation.

Daylight

December has the shortest days of the year in Whittier, with an average of 9h and 54min of daylight.
On the first day of the month, sunrise is at 6:39 am and sunset at 4:42 pm. On the last day of December, in Whittier, sunrise is at 6:57 am and sunset at 4:53 pm PST.

Sunshine

In Whittier, the average sunshine in December is 6.8h.

UV index

The months with the lowest UV index are February, November and December, with an average maximum UV index of 4. A UV Index of 3 to 5 symbolizes a medium vulnerability from exposure to the Sun's UV radiation for the ordinary person.
Note: The maximum daily UV index of 4 in December converts into the following recommendations:
Be mindful. Individuals with a lighter skin tone may suffer burns in less than 30 minutes. Stay safe from the Sun's strongest UV rays by limiting exposure during midday. Select sunglasses that boast both UVA and UVB protection to limit the adverse effects of the sun on the eyes.

Frequently asked questions

What month is the coldest in Whittier?

Whittier's coldest month, December, registers temperatures that range from a high of 64.9°F (18.3°C) to a low of 50°F (10°C).

What is the average December temperature in Whittier?

An average high-temperature, in December, in Whittier, is 64.9°F (18.3°C) and the average low-temperature is 50°F (10°C). In September, the average heat index (a.k.a. 'feels like', 'felt air temperature'), which factors the actual air temperature with the relative humidity, is evaluated at 87.8°F (31°C).

What is the average humidity in December in Whittier?

In Whittier, California, the average relative humidity in December is 52%.

What is the rainiest month in Whittier?

December is the month with the most rainfall in Whittier. Rain falls for 4.8 days and accumulates 1.14" (29mm) of precipitation.

How much does it rain in Whittier in December?

In Whittier, California, in December, during 4.8 rainfall days, 1.14" (29mm) of precipitation is typically accumulated.

What is the month with the shortest days in Whittier?

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

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

In December, the average day length in Whittier is 9h and 56min.

What time are sunrise and sunset in December in Whittier?

In December, on the first day of the month, sunrise is at 6:39 am and sunset at 4:42 pm. On the last day of the month, sunrise is at 6:57 am and sunset at 4:53 pm PST.

How long on average sun shines in December in Whittier?

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

When is the lowest UV index in Whittier?

February, November and December, with an average maximum UV index of 4, are months with the lowest UV index in Whittier, California.

How high is the UV index in December in Whittier?

In December, the average daily maximum UV index in Whittier, California, is 4. 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 daylight
Average sunshine
Average sunshine days
Average UV index
Average cloud cover
Average visibility

Average temperature in December
Whittier, CA

Average temperature in December - Whittier, CA
  • Average high temperature in December: 64.9°F

The warmest month (with the highest average high temperature) is August (86.5°F).
The month with the lowest average high temperature is December (64.9°F).

  • Average low temperature in December: 50°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 (49.8°F).

Average pressure in December
Whittier, CA

Average pressure in December - Whittier, CA
  • Average pressure in December: 30.07"Hg

The month with the highest atmospheric pressure is January (30.1"Hg).
The month with the lowest atmospheric pressure is June (29.88"Hg).

Average wind speed in December
Whittier, CA

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

The windiest month (with the highest average wind speed) is April (6mph).
The calmest months (with the lowest average wind speed) are September and October (4.7mph).

Average humidity in December
Whittier, CA

Average humidity in December - Whittier, CA
  • Average humidity in December: 52%

The month with the highest relative humidity is June (62%).
The month with the lowest relative humidity is November (47%).

Average rainfall in December
Whittier, CA

Average rainfall in December - Whittier, CA
  • Average rainfall in December: 1.14"

The wettest month (with the highest rainfall) is December (1.14").
The driest month (with the least rainfall) is June (0.04").

Average rainfall days in December
Whittier, CA

Average rainfall days in December - Whittier, CA
  • Average rainfall days in December: 4.8 days

The month with the highest number of rainy days is March (5.1 days).
The month with the least rainy days is June (1 days).

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

Average daylight in December / Average sunshine in December - Whittier, 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 July and August (Average sunshine: 12h and 0min).
The month with the least sunshine is February (Average sunshine: 6h and 42min).

Average sunshine days in December
Whittier, CA

Average sunshine days in December - Whittier, CA
  • Average sunshine days in December: 24.8 days

The month with the most sunshine days is June (27.9 days).
The month with the least sunshine days is February (22.6 days).

Average UV index in December
Whittier, CA

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

The month with the highest UV index is August (UV index 7).
The months with the lowest UV index are February, November and December (UV index 4).

Average cloud cover in December
Whittier, CA

Average cloud cover in December - Whittier, CA
  • Average cloud cover in December: 22

The months with the most cloud cover are March and December (Cloud cover 22).
The month with the least cloud cover is August (Cloud cover 6).

Average visibility in December
Whittier, CA

Average visibility in December - Whittier, 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).

Whittier, California, USA

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