December weather forecastCommerce, CA
December
Weather in December
The first month of the winter, December, is still a refreshing month in Commerce, California, with an average temperature fluctuating between 50°F (10°C) and 64.4°F (18°C).Temperature
The month of December, characterized by an average high of 64.4°F (18°C) and a low of 50°F (10°C), is recognized as the coldest.Humidity
The average relative humidity in December in Commerce is 53%.Rainfall
In Commerce, California, during December, the rain falls for 6 days and regularly aggregates up to 1.61" (41mm) of precipitation. Throughout the year, there are 48.3 rainfall days, and 7.91" (201mm) of precipitation is accumulated.Daylight
With an average of 9h and 54min of daylight, December has the shortest days of the year.On the first day of the month, sunrise is at 6:40 am and sunset at 4:43 pm. On the last day of December, in Commerce, sunrise is at 6:57 am and sunset at 4:54 pm PST.
Sunshine
The months with the least sunshine in Commerce are January, February and December, with an average of 6.8h of sunshine.UV index
The months with the lowest UV index in Commerce are January, February, November and December, with an average maximum UV index of 4. A UV Index of 3 to 5 symbolizes a moderate health risk from exposure to the Sun's UV radiation for average individuals.Note: A maximum high daily UV index of 4 during December translates into the following directions:
Be vigilant - A duty to shield skin and eyes from injury exists. Sun's radiation is most powerful around mid-day, so it's best to limit outdoor activities during this time. Experience reduced UV exposure by about half when donning a wide-brim hat.
Published by: Weather U.S. | About Us
Data Sources | Weather Forecasting & Climate
Frequently asked questions
Average temperature in December
Commerce, CA
- Average high temperature in December: 64.4°F
The warmest month (with the highest average high temperature) is August (85.3°F).
The month with the lowest average high temperature is December (64.4°F).
- Average low temperature in December: 50°F
The month with the highest average low temperature is August (65.7°F).
The coldest month (with the lowest average low temperature) is February (49.3°F).
Average pressure in December
Commerce, 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
Commerce, 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 August, September and October (4.7mph).
Average humidity in December
Commerce, CA
- Average humidity in December: 53%
The month with the highest relative humidity is June (63%).
The month with the lowest relative humidity is November (48%).
Average rainfall in December
Commerce, CA
- Average rainfall in December: 1.61"
The wettest month (with the highest rainfall) is February (1.73").
The driest months (with the least rainfall) are June and August (0.04").
Average rainfall days in December
Commerce, CA
- Average rainfall days in December: 6 days
The month with the highest number of rainy days is March (7.2 days).
The months with the least rainy days are June and August (1.3 days).
Average daylight in December /
Average sunshine in December
Commerce, 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 month with the most sunshine is July (Average sunshine: 12h and 6min).
The months with the least sunshine are January, February and December (Average sunshine: 6h and 48min).
Average sunshine days in December
Commerce, CA
- Average sunshine days in December: 23.5 days
The month with the most sunshine days is August (27.7 days).
The month with the least sunshine days is February (20.6 days).
Average UV index in December
Commerce, CA
- Average UV index in December: 4
The months with the highest UV index are June, July, August and September (UV index 6).
The months with the lowest UV index are January, February, November and December (UV index 4).
Average cloud cover in December
Commerce, 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 5).
Average visibility in December
Commerce, 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).
