December weather forecastWhittier, CA
December
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.
Published by: Weather U.S. | About Us
Data Sources | Weather Forecasting & Climate
Frequently asked questions
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: 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: 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: 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: 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: 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: 9h and 54min
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 48min
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: 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: 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: 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: 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).
