December weather forecastSan Joaquin, CA
December
Weather in December
The first month of the winter, December, is still a refreshing month in San Joaquin, California, with an average temperature ranging between max 56.5°F (13.6°C) and min 42.6°F (5.9°C).Temperature
San Joaquin experiences its lowest temperatures in December, with an average peak of 56.5°F (13.6°C) and a low of 42.6°F (5.9°C).Humidity
January and December, with an average relative humidity of 66%, are the most humid months.Rainfall
In San Joaquin, in December, it is raining for 5.7 days, with typically 0.35" (9mm) of accumulated precipitation. Throughout the year, there are 37.2 rainfall days, and 2.48" (63mm) of precipitation is accumulated.Daylight
December has the shortest days of the year, with an average of 9h and 42min of daylight.On the first day of the month, sunrise is at 6:55 am and sunset at 4:45 pm. On the last day of December, sunrise is at 7:12 am and sunset at 4:55 pm PST.
Sunshine
The months with the least sunshine are February and December, with an average of 6.4h of sunshine.UV index
The months with the lowest UV index are January, November and December, with an average maximum UV index of 3. A UV Index value of 3 to 5 symbolizes a moderate threat to health from exposure to the Sun's UV radiation for average individuals.Note: In December, the maximum UV index of 3 translates into these guidelines:
Be mindful. Individuals with a lighter skin tone may suffer burns in less than 30 minutes. Avoiding the Sun during its peak radiation time around midday is a healthy practice. On bright days sunglasses that block both UVA and UVB rays should be worn. A hat with a wide brim is extremely helpful, as it can prevent roughly 50% of UV radiation from reaching the eyes.
Published by: Weather U.S. | About Us
Data Sources | Weather Forecasting & Climate
Frequently asked questions
Average temperature in December
San Joaquin, CA
- Average high temperature in December: 56.5°F
The warmest month (with the highest average high temperature) is July (100.9°F).
The month with the lowest average high temperature is December (56.5°F).
- Average low temperature in December: 42.6°F
The month with the highest average low temperature is July (67.1°F).
The coldest month (with the lowest average low temperature) is December (42.6°F).
Average pressure in December
San Joaquin, CA
- Average pressure in December: 30.12"Hg
The month with the highest atmospheric pressure is January (30.14"Hg).
The month with the lowest atmospheric pressure is June (29.9"Hg).
Average wind speed in December
San Joaquin, CA
- Average wind speed in December: 5.3mph
The windiest month (with the highest average wind speed) is June (7.6mph).
The calmest month (with the lowest average wind speed) is January (5.1mph).
Average humidity in December
San Joaquin, CA
- Average humidity in December: 66%
The months with the highest relative humidity are January and December (66%).
The month with the lowest relative humidity is July (30%).
Average rainfall in December
San Joaquin, CA
- Average rainfall in December: 0.35"
The wettest months (with the highest rainfall) are February and March (0.43").
The driest months (with the least rainfall) are June, July, August and September (0.04").
Average rainfall days in December
San Joaquin, CA
- Average rainfall days in December: 5.7 days
The month with the highest number of rainy days is March (7 days).
The months with the least rainy days are August and September (0.5 days).
Average daylight in December /
Average sunshine in December
San Joaquin, CA
- Average daylight in December: 9h and 42min
The month with the longest days is June (Average daylight: 14h and 36min).
The month with the shortest days is December (Average daylight: 9h and 42min).
- Average sunshine in December: 6h and 24min
The month with the most sunshine is July (Average sunshine: 12h and 12min).
The months with the least sunshine are February and December (Average sunshine: 6h and 24min).
Average sunshine days in December
San Joaquin, CA
- Average sunshine days in December: 24.6 days
The month with the most sunshine days is August (29.7 days).
The month with the least sunshine days is February (22 days).
Average UV index in December
San Joaquin, CA
- Average UV index in December: 3
The months with the highest UV index are June, July and August (UV index 7).
The months with the lowest UV index are January, November and December (UV index 3).
Average cloud cover in December
San Joaquin, CA
- Average cloud cover in December: 28
The month with the most cloud cover is March (Cloud cover 29).
The months with the least cloud cover are July and August (Cloud cover 4).
Average visibility in December
San Joaquin, 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).
