December weather forecastPleasanton, CA
December
Weather in December
December, the first month of the winter in Pleasanton, is also a fresh month, with an average temperature varying between 55°F (12.8°C) and 41.7°F (5.4°C).Temperature
With average high and low temperatures of 55°F (12.8°C) and 41.7°F (5.4°C) respectively, December is Pleasanton's coldest month.Humidity
In Pleasanton, the average relative humidity in December is 71%.Rainfall
In December, the rain falls for 10.4 days. Throughout December, 1.81" (46mm) of precipitation is accumulated. In Pleasanton, during the entire year, the rain falls for 70.2 days and collects up to 10.98" (279mm) of precipitation.Daylight
With an average of 9h and 36min of daylight, December has the shortest days of the year.On the first day of December, sunrise is at 7:04 am and sunset at 4:49 pm. On the last day of the month, sunrise is at 7:22 am and sunset at 4:59 pm PST.
Sunshine
With an average of 6h of sunshine, December has the least sunshine of the year.UV index
The months with the lowest UV index are January, February, November and December, with an average maximum UV index of 3. A UV Index reading of 3 to 5 represents a moderate threat to health from exposure to the Sun's UV rays for the average person.Note: In December, the maximum UV index of 3 suggests this advice:
Ensure safety - Imperative it is to shield skin and eyes from damage. To guard against the harmful effects of the Sun, minimize exposure during midday. Your best bet for sun defense on the face, eyes, and neck is a hat with a wide brim.
Published by: Weather U.S. | About Us
Data Sources | Weather Forecasting & Climate
Frequently asked questions
Average temperature in December
Pleasanton, CA
- Average high temperature in December: 55°F
The warmest month (with the highest average high temperature) is July (85.3°F).
The month with the lowest average high temperature is December (55°F).
- Average low temperature in December: 41.7°F
The month with the highest average low temperature is August (56.7°F).
The coldest month (with the lowest average low temperature) is January (41.5°F).
Average pressure in December
Pleasanton, CA
- Average pressure in December: 30.11"Hg
The month with the highest atmospheric pressure is January (30.14"Hg).
The months with the lowest atmospheric pressure are June, August and September (29.92"Hg).
Average wind speed in December
Pleasanton, CA
- Average wind speed in December: 4.7mph
The windiest month (with the highest average wind speed) is May (6.3mph).
The calmest month (with the lowest average wind speed) is November (4.2mph).
Average humidity in December
Pleasanton, CA
- Average humidity in December: 71%
The month with the highest relative humidity is March (74%).
The months with the lowest relative humidity are July and September (56%).
Average rainfall in December
Pleasanton, CA
- Average rainfall in December: 1.81"
The wettest month (with the highest rainfall) is February (2.05").
The driest months (with the least rainfall) are July and August (0.04").
Average rainfall days in December
Pleasanton, CA
- Average rainfall days in December: 10.4 days
The month with the highest number of rainy days is March (12.4 days).
The month with the least rainy days is August (0.9 days).
Average daylight in December /
Average sunshine in December
Pleasanton, 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: 6h and 0min
The month with the most sunshine is July (Average sunshine: 12h and 6min).
The month with the least sunshine is December (Average sunshine: 6h and 0min).
Average sunshine days in December
Pleasanton, CA
- Average sunshine days in December: 19.6 days
The month with the most sunshine days is August (29 days).
The month with the least sunshine days is March (17.6 days).
Average UV index in December
Pleasanton, CA
- Average UV index in December: 3
The months with the highest UV index are June, July and August (UV index 6).
The months with the lowest UV index are January, February, November and December (UV index 3).
Average cloud cover in December
Pleasanton, CA
- Average cloud cover in December: 34
The month with the most cloud cover is March (Cloud cover 35).
The month with the least cloud cover is July (Cloud cover 5).
Average visibility in December
Pleasanton, 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).
