December weather forecastSouth Pasadena, CA
December
Weather in December
The first month of the winter, December, is still a comfortable month in South Pasadena, California, with temperature in the range of an average high of 63.1°F (17.3°C) and an average low of 47.8°F (8.8°C).Temperature
South Pasadena's December weather reaches an average high of 63.1°F (17.3°C) and an average low of 47.8°F (8.8°C), making it the coldest month.Humidity
In December, the average relative humidity is 52%.Rainfall
In South Pasadena, in December, during 6 rainfall days, 1.65" (42mm) of precipitation is typically accumulated. Throughout the year, there are 49.2 rainfall days, and 8.23" (209mm) of precipitation is accumulated.Snowfall
December is the only month when snow falls. December has the most snowfall days of the year. Snow falls for 0.1 days.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 6:40 am and sunset at 4:43 pm. On the last day of the month, sunrise is at 6:58 am and sunset at 4:53 pm PST.
Sunshine
The months with the least sunshine are January, February and December, with an average of 6.9h of sunshine.UV index
The months with the lowest UV index 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 unsafe exposure to UV radiation for the average person.Note: In December, the average maximum UV index of 4 translates into the following recommendations:
Exercise care. People with light skin might get burns in fewer than 30 minutes. The Sun's UV radiation is especially harmful around midday, so reduce exposure and stay safe. Enhance your sun protection with tightly woven, yet airy clothing. Be watchful! The reflection of snow can enhance the intensity of the Sun's UV radiation nearly double.
Published by: Weather U.S. | About Us
Data Sources | Weather Forecasting & Climate
Frequently asked questions
Average temperature in December
South Pasadena, CA
- Average high temperature in December: 63.1°F
The warmest month (with the highest average high temperature) is August (86.7°F).
The month with the lowest average high temperature is December (63.1°F).
- Average low temperature in December: 47.8°F
The month with the highest average low temperature is August (65.7°F).
The coldest months (with the lowest average low temperature) are February and December (47.8°F).
Average pressure in December
South Pasadena, CA
- Average pressure in December: 30.08"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
South Pasadena, CA
- Average wind speed in December: 5.2mph
The windiest month (with the highest average wind speed) is April (5.7mph).
The calmest month (with the lowest average wind speed) is September (4.4mph).
Average humidity in December
South Pasadena, CA
- Average humidity in December: 52%
The month with the highest relative humidity is June (59%).
The month with the lowest relative humidity is November (47%).
Average rainfall in December
South Pasadena, CA
- Average rainfall in December: 1.65"
The wettest month (with the highest rainfall) is February (1.77").
The driest month (with the least rainfall) is June (0.04").
Average rainfall days in December
South Pasadena, CA
- Average rainfall days in December: 6 days
The month with the highest number of rainy days is March (7.7 days).
The month with the least rainy days is June (1 days).
Average snowfall days in December
South Pasadena, CA
- Average snowfall days in December: 0.1 days
The month with the highest number of snowfall days is December (0.1 days).
The months with the least snowfall days are January, February, March, April, May, June, July, August, September, October and November (0 days).
Average daylight in December /
Average sunshine in December
South Pasadena, 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 54min
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 54min).
Average sunshine days in December
South Pasadena, CA
- Average sunshine days in December: 23.5 days
The month with the most sunshine days is August (28.3 days).
The month with the least sunshine days is February (21 days).
Average UV index in December
South Pasadena, 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
South Pasadena, CA
- Average cloud cover in December: 21
The months with the most cloud cover are March and December (Cloud cover 21).
The month with the least cloud cover is August (Cloud cover 4).
Average visibility in December
South Pasadena, 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).
