December weather forecastMonte Sereno, CA
December
Weather in December
The first month of the winter, December, is still a refreshing month in Monte Sereno, California, with temperature in the range of an average high of 56.7°F (13.7°C) and an average low of 43.7°F (6.5°C).Temperature
In Monte Sereno, California, the month of December is known for its lowest average temperatures, reaching a high of 56.7°F (13.7°C) and a low of 43.7°F (6.5°C).Humidity
In Monte Sereno, the average relative humidity in December is 71%.Rainfall
In Monte Sereno, during December, the rain falls for 9.6 days and regularly aggregates up to 2.01" (51mm) of precipitation. In Monte Sereno, California, during the entire year, the rain falls for 68.6 days and collects up to 11.57" (294mm) of precipitation.Daylight
The month with the shortest days in Monte Sereno is December, with an average of 9h and 42min of daylight.On the first day of the month, sunrise is at 7:03 am and sunset at 4:50 pm. On the last day of December, sunrise is at 7:21 am and sunset at 5:00 pm PST.
Sunshine
With an average of 6h of sunshine, December has the least sunshine of the year in Monte Sereno.UV index
The months with the lowest UV index in Monte Sereno are January, February, November and December, with an average maximum UV index of 3. A UV Index of 3 to 5 symbolizes a medium health hazard from exposure to the Sun's UV rays for the average person.Note: The UV index of 3 in December translates into these instructions:
Safety measures are advised. Light-skinned individuals may experience burns in under half an hour. Avoiding direct sunlight during midday hours helps reduce the risk from intense UV radiation. It's wise to wear UVA and UVB-blocking sunglasses when the sun shines brightly.
Published by: Weather U.S. | About Us
Data Sources | Weather Forecasting & Climate
Frequently asked questions
Average temperature in December
Monte Sereno, CA
- Average high temperature in December: 56.7°F
The warmest month (with the highest average high temperature) is July (80.8°F).
The month with the lowest average high temperature is December (56.7°F).
- Average low temperature in December: 43.7°F
The month with the highest average low temperature is August (55.9°F).
The coldest month (with the lowest average low temperature) is February (43.5°F).
Average pressure in December
Monte Sereno, 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 and September (29.92"Hg).
Average wind speed in December
Monte Sereno, CA
- Average wind speed in December: 5.1mph
The windiest month (with the highest average wind speed) is April (5.9mph).
The calmest months (with the lowest average wind speed) are August, September, October and November (4.5mph).
Average humidity in December
Monte Sereno, 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 (62%).
Average rainfall in December
Monte Sereno, CA
- Average rainfall in December: 2.01"
The wettest month (with the highest rainfall) is February (2.2").
The driest months (with the least rainfall) are July and August (0.04").
Average rainfall days in December
Monte Sereno, CA
- Average rainfall days in December: 9.6 days
The month with the highest number of rainy days is March (12.5 days).
The month with the least rainy days is August (0.9 days).
Average daylight in December /
Average sunshine in December
Monte Sereno, CA
- Average daylight in December: 9h and 42min
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 42min).
- 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
Monte Sereno, CA
- Average sunshine days in December: 19.8 days
The month with the most sunshine days is August (29.2 days).
The month with the least sunshine days is March (17.3 days).
Average UV index in December
Monte Sereno, 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
Monte Sereno, CA
- Average cloud cover in December: 33
The month with the most cloud cover is March (Cloud cover 35).
The month with the least cloud cover is July (Cloud cover 6).
Average visibility in December
Monte Sereno, 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).
