Contents
- Weather in December
- Frequently asked questions
- Average temperature in December
- Average pressure in December
- Average wind speed in December
- Average humidity in December
- Average rainfall in December
- Average rainfall days in December
- Average daylight in December
- Average sunshine in December
- Average sunshine days in December
- Average UV index in December
- Average cloud cover in December
- Average visibility in December
Weather in December
Temperature
December, on average, is the coldest month, registering a high temperature of 55.8°F (13.2°C) and a low of 42.3°F (5.7°C).Humidity
The average relative humidity in December in Diablo is 71%.Rainfall
In Diablo, in December, it is raining for 9.8 days, with typically 1.73" (44mm) of accumulated precipitation. In Diablo, during the entire year, the rain falls for 65.6 days and collects up to 11.22" (285mm) of precipitation.Daylight
The month with the shortest days is December, 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 4:49 pm. On the last day of December, sunrise is at 7:23 am and sunset at 4:59 pm PST.
Sunshine
December has the least sunshine of the year in Diablo, with an average of 5.8h of sunshine.UV index
January, February, November and December, with an average maximum UV index of 3, are months with the lowest UV index in Diablo. A UV Index estimate of 3 to 5 represents a moderate health risk from exposure to the Sun's UV radiation for average individuals.Note: A maximum daily UV index of 3 during December morphs into the following directions:
Take precautions. Light skin individuals may get burned in less than 30 minutes. Minimize direct exposure to the Sun during midday when its radiation is at its peak. Prioritize a wide-brim hat for comprehensive sun defense for your face, neck, eyes, and ears.
Frequently asked questions
What month is the coldest in Diablo?
What is the temperature in December in Diablo?
What is the average humidity in December in Diablo?
How many days does it rain in December in Diablo?
What is the month with the shortest days in Diablo?
What is the average length of the day in December in Diablo?
What time are sunrise and sunset in December in Diablo?
What is the month with the least sunshine in Diablo?
How long on average sun shines in December in Diablo?
When is the lowest UV index in Diablo?
What is the UV index reading in December in Diablo?
Average temperature in December
Diablo, CA
- Average high temperature in December: 55.8°F
The warmest month (with the highest average high temperature) is July (83.8°F).
The month with the lowest average high temperature is December (55.8°F).
- Average low temperature in December: 42.3°F
The months with the highest average low temperature are August and September (56.7°F).
The coldest month (with the lowest average low temperature) is January (42.1°F).
Average pressure in December
Diablo, 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
Diablo, CA
- Average wind speed in December: 4.8mph
The windiest month (with the highest average wind speed) is May (6.9mph).
The calmest month (with the lowest average wind speed) is November (4.3mph).
Average humidity in December
Diablo, 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 (57%).
Average rainfall in December
Diablo, CA
- Average rainfall in December: 1.73"
The wettest month (with the highest rainfall) is February (2.36").
The driest months (with the least rainfall) are July and August (0").
Average rainfall days in December
Diablo, CA
- Average rainfall days in December: 9.8 days
The month with the highest number of rainy days is March (12.6 days).
The month with the least rainy days is August (0.6 days).
Average daylight in December /
Average sunshine in December
Diablo, CA
- Average daylight in December: 9h and 4min
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 5min
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 48min).
Average sunshine days in December
Diablo, CA
- Average sunshine days in December: 20.6 days
The month with the most sunshine days is July (30.2 days).
The month with the least sunshine days is March (17.6 days).
Average UV index in December
Diablo, 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
Diablo, CA
- Average cloud cover in December: 35
The month with the most cloud cover is March (Cloud cover 36).
The month with the least cloud cover is July (Cloud cover 6).
Average visibility in December
Diablo, 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).
Diablo, California, USA
Weather forecast for your location
2. Allow the app to use your location
