December weather forecastSan Lorenzo, CA
December
Weather in December
The first month of the winter, December, is still a refreshing month in San Lorenzo, California, with an average temperature fluctuating between 44.1°F (6.7°C) and 56.1°F (13.4°C).Temperature
December tends to be the coldest month, with temperatures averaging a daily high of 56.1°F (13.4°C) and a low of 44.1°F (6.7°C).Humidity
In December, the average relative humidity is 71%.Rainfall
In San Lorenzo, in December, it is raining for 8.6 days, with typically 0.67" (17mm) of accumulated precipitation. Throughout the year, there are 56.9 rainfall days, and 4.06" (103mm) of precipitation is accumulated.Daylight
December has the shortest days of the year, with an average of 9h and 36min of daylight.On the first day of the month, sunrise is at 7:05 am and sunset at 4:50 pm. On the last day of December, sunrise is at 7:23 am and sunset at 5:00 pm PST.
Sunshine
The month with the least sunshine is December, with an average of 5.9h of sunshine.UV index
January, February, November and December, with an average maximum UV index of 3, are months with the lowest UV index. A UV Index estimate of 3 to 5 represents a moderate health risk from unprotected exposure to Sun's UV rays for average individuals.Note: The daily maximum UV index of 3 in December interprets into the following advice:
Exercise caution. Those with pale skin may experience burns in less than half an hour. Avoiding direct sunlight during midday hours helps reduce the risk from intense UV radiation. To best shield against UV radiation, choose sun-safe garments and dependable sunglasses.
Published by: Weather U.S. | About Us
Data Sources | Weather Forecasting & Climate
Frequently asked questions
Average temperature in December
San Lorenzo, CA
- Average high temperature in December: 56.1°F
The warmest month (with the highest average high temperature) is July (79.2°F).
The month with the lowest average high temperature is December (56.1°F).
- Average low temperature in December: 44.1°F
The month with the highest average low temperature is September (56.5°F).
The coldest months (with the lowest average low temperature) are January and December (44.1°F).
Average pressure in December
San Lorenzo, CA
- Average pressure in December: 30.11"Hg
The month with the highest atmospheric pressure is January (30.13"Hg).
The months with the lowest atmospheric pressure are June, August and September (29.92"Hg).
Average wind speed in December
San Lorenzo, CA
- Average wind speed in December: 5.4mph
The windiest month (with the highest average wind speed) is May (6.7mph).
The calmest month (with the lowest average wind speed) is November (4.7mph).
Average humidity in December
San Lorenzo, CA
- Average humidity in December: 71%
The month with the highest relative humidity is March (74%).
The month with the lowest relative humidity is September (62%).
Average rainfall in December
San Lorenzo, CA
- Average rainfall in December: 0.67"
The wettest month (with the highest rainfall) is February (0.87").
The driest months (with the least rainfall) are June, July and August (0.04").
Average rainfall days in December
San Lorenzo, CA
- Average rainfall days in December: 8.6 days
The month with the highest number of rainy days is March (10.5 days).
The month with the least rainy days is August (0.7 days).
Average daylight in December /
Average sunshine in December
San Lorenzo, CA
- Average daylight in December: 9h and 36min
The month with the longest days is June (Average daylight: 14h and 42min).
The month with the shortest days is December (Average daylight: 9h and 36min).
- Average sunshine in December: 5h and 54min
The month with the most sunshine is July (Average sunshine: 12h and 6min).
The month with the least sunshine is December (Average sunshine: 5h and 54min).
Average sunshine days in December
San Lorenzo, CA
- Average sunshine days in December: 20.6 days
The month with the most sunshine days is July (27.9 days).
The month with the least sunshine days is March (18.6 days).
Average UV index in December
San Lorenzo, CA
- Average UV index in December: 3
The month with the highest UV index is June (UV index 6).
The months with the lowest UV index are January, February, November and December (UV index 3).
Average cloud cover in December
San Lorenzo, CA
- Average cloud cover in December: 33
The month with the most cloud cover is March (Cloud cover 34).
The month with the least cloud cover is July (Cloud cover 7).
Average visibility in December
San Lorenzo, 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).
