December weather forecast and climate
Whittier, CA

Weather in December

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

Temperature

The coldest month is December, with an average high-temperature of 64.9°F (18.3°C) and an average low-temperature of 50°F (10°C).

Humidity

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

Rainfall

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

Daylight

December has the shortest days of the year in Whittier, with an average of 9.9h of daylight.

Sunshine

In December, the average sunshine is 6.8h.

UV index

February, November and December, with an average maximum UV index of 4, are months with the lowest UV index in Whittier. A UV Index reading of 3 to 5 represents a medium vulnerability from unsafe exposure to the UV radiation for the ordinary person.
Note: In December, the average maximum UV index of 4 translate into the following recommendations:
Take precautions - Protection against the skin and eye damage is obliged. The Sun's most intense and consequently most harmful UV radiation during midday hours should be decreased by minimizing exposure and seeking shade. 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.
[Resources]

FAQ

What is the coldest month in Whittier?

The coldest month in Whittier is December, with an average high-temperature of 64.9°F (18.3°C) and an average low-temperature of 50°F (10°C).

What is the temperature in December in Whittier?

In December, the average high-temperature is 64.9°F (18.3°C), and the average low-temperature is 50°F (10°C).

What is the average humidity in December in Whittier?

The average relative humidity in December is 52%.

How many days does it rain in December in Whittier?

In Whittier, during December, the rain falls for 4.8 days and regularly aggregates up to 1.14" (29mm) of precipitation.

What is the rainiest month in Whittier?

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

What is the month with the shortest days in Whittier?

The month with the shortest days in Whittier is December, with an average of 9.9h of daylight.

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

The average length of the day in December is 9.9h.

How many hours of sunshine does Whittier have in December?

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

What are the months with 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 is 4. A UV Index reading of 3 to 5 represents a medium hazard to health from the exposure to the Sun's UV radiation.

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).

[Resources]

Average pressure in December
Whittier, CA

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

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

[Resources]

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).

[Resources]

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%).

[Resources]

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").

[Resources]

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).

[Resources]

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

Average daylight in December / Average sunshine in December - Whittier, CA
  • Average daylight in December: 9.9h

The month with the longest days is June (Average daylight: 14.4h).
The month with the shortest days is December (Average daylight: 9.9h).

  • Average sunshine in December: 6.8h

Months with the most sunshine are July and August (Average sunshine: 12h).
The month with the least sunshine is February (Average sunshine: 6.7h).

[Resources]

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).

[Resources]

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).
Months with the lowest UV index are February, November and December (UV index 4).

[Resources]

Average cloud cover in December
Whittier, CA

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

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).

[Resources]

Average visibility in December
Whittier, CA

Average visibility in December - Whittier, CA
  • Average visibility in December: 6mi

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

[Resources]