December weather forecastSylmar, CA
December
Weather in December
The first month of the winter, December, is still a refreshing month in Sylmar, California, with temperature in the range of an average low of 46.2°F (7.9°C) and an average high of 61.7°F (16.5°C).Temperature
December, with its average high-temperature of 61.7°F (16.5°C) and an average low-temperature of 46.2°F (7.9°C), holds the record as the coldest month.Humidity
In December, the average relative humidity is 52%.Rainfall
In Sylmar, during December, the rain falls for 5 days and regularly aggregates up to 1.42" (36mm) of precipitation. In Sylmar, during the entire year, the rain falls for 39.8 days and collects up to 7.52" (191mm) of precipitation.Daylight
The month with the shortest days is December, with an average of 9h and 54min of daylight.On the first day of December, sunrise is at 6:42 am and sunset at 4:43 pm. On the last day of the month, sunrise is at 6:59 am and sunset at 4:54 pm PST.
Sunshine
The months with the least sunshine are January, February and December, with an average of 6.8h of sunshine.UV index
The month with the lowest UV index is December, with an average maximum UV index of 3. A UV Index estimate of 3 to 5 represents a moderate health risk from exposure to the Sun's UV rays for the average person.Note: In December, a daily maximum UV index of 3 leads to the following instructions:
Be vigilant - Suggestions to stave off sun damage are provided. For health reasons, it's advisable to reduce direct sun exposure during peak hours around midday. For holistic sun protection encompassing the eyes, ears, face, and neck, a wide-brim hat is key.
Published by: Weather U.S. | About Us
Data Sources | Weather Forecasting & Climate
Frequently asked questions
Average temperature in December
Sylmar, CA
- Average high temperature in December: 61.7°F
The warmest month (with the highest average high temperature) is August (85.8°F).
The month with the lowest average high temperature is December (61.7°F).
- Average low temperature in December: 46.2°F
The month with the highest average low temperature is August (64.9°F).
The coldest month (with the lowest average low temperature) is December (46.2°F).
Average pressure in December
Sylmar, CA
- Average pressure in December: 30.08"Hg
The month with the highest atmospheric pressure is January (30.11"Hg).
The month with the lowest atmospheric pressure is June (29.89"Hg).
Average wind speed in December
Sylmar, CA
- Average wind speed in December: 6.2mph
The windiest months (with the highest average wind speed) are January and December (6.2mph).
The calmest month (with the lowest average wind speed) is September (4.5mph).
Average humidity in December
Sylmar, CA
- Average humidity in December: 52%
The month with the highest relative humidity is June (58%).
The month with the lowest relative humidity is November (47%).
Average rainfall in December
Sylmar, CA
- Average rainfall in December: 1.42"
The wettest month (with the highest rainfall) is February (1.54").
The driest month (with the least rainfall) is June (0").
Average rainfall days in December
Sylmar, CA
- Average rainfall days in December: 5 days
The month with the highest number of rainy days is March (6.3 days).
The month with the least rainy days is June (0.8 days).
Average daylight in December /
Average sunshine in December
Sylmar, 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 June and 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
Sylmar, CA
- Average sunshine days in December: 25.2 days
The month with the most sunshine days is May (28.8 days).
The month with the least sunshine days is February (22.9 days).
Average UV index in December
Sylmar, CA
- Average UV index in December: 3
The months with the highest UV index are June, July, August and September (UV index 6).
The month with the lowest UV index is December (UV index 3).
Average cloud cover in December
Sylmar, CA
- Average cloud cover in December: 21
The month with the most cloud cover is March (Cloud cover 22).
The month with the least cloud cover is August (Cloud cover 4).
Average visibility in December
Sylmar, 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).
