December weather forecastOnyx, CA
December
Weather in December
December, the first month of the winter in Onyx, is still a chilly month, with an average temperature varying between 48.7°F (9.3°C) and 30.9°F (-0.6°C).Temperature
December is the coldest month, with the temperature often reaching an average high of 48.7°F (9.3°C) and an average low of 30.9°F (-0.6°C).Humidity
The average relative humidity in December is 57%.Rainfall
In Onyx, in December, it is raining for 7.3 days, with typically 1.89" (48mm) of accumulated precipitation. In Onyx, during the entire year, the rain falls for 61 days and collects up to 11.81" (300mm) of precipitation.Snowfall
Months with snowfall in Onyx are January through April, November and December. In Onyx, in December, during 1.5 snowfall days, 0.71" (18mm) of snow is typically accumulated. Throughout the year, in Onyx, there are 9.1 snowfall days, and 9.13" (232mm) of snow is accumulated.Daylight
The month with the shortest days in Onyx is December, with an average of 9h and 48min of daylight.On the first day of December, sunrise is at 6:44 am and sunset at 4:39 pm. On the last day of the month, sunrise is at 7:02 am and sunset at 4:49 pm PST.
Sunshine
The months with the least sunshine are January, February and December, with an average of 6.7h of sunshine.UV index
The months with the lowest UV index are February, November and December, with an average maximum UV index of 2. A UV Index value of 2, and less, symbolizes a minimal health hazard from unprotected exposure to Sun's UV rays for the average person.Note: A typical high UV index of 2 in December suggests the following recommendations:
In contrast to children, who must always be shielded from the sun, most people can tolerate up to an hour of sun exposure without any burns. The Sun's harshest UV rays are around midday; it's wise to seek shade and limit time outdoors. Boost your sun resistance with garments that are densely woven yet spacious. Beware! Reflection from snow can magnify the Sun's UV radiation nearly twofold.
Published by: Weather U.S. | About Us
Data Sources | Weather Forecasting & Climate
Frequently asked questions
Average temperature in December
Onyx, CA
- Average high temperature in December: 48.7°F
The warmest month (with the highest average high temperature) is July (85.8°F).
The month with the lowest average high temperature is December (48.7°F).
- Average low temperature in December: 30.9°F
The month with the highest average low temperature is July (58.6°F).
The coldest month (with the lowest average low temperature) is December (30.9°F).
Average pressure in December
Onyx, CA
- Average pressure in December: 30.1"Hg
The month with the highest atmospheric pressure is January (30.14"Hg).
The month with the lowest atmospheric pressure is June (29.85"Hg).
Average wind speed in December
Onyx, CA
- Average wind speed in December: 5.6mph
The windiest months (with the highest average wind speed) are May and June (7.3mph).
The calmest months (with the lowest average wind speed) are January and September (5.4mph).
Average humidity in December
Onyx, CA
- Average humidity in December: 57%
The month with the highest relative humidity is February (59%).
The month with the lowest relative humidity is August (31%).
Average rainfall in December
Onyx, CA
- Average rainfall in December: 1.89"
The wettest month (with the highest rainfall) is January (2.48").
The driest month (with the least rainfall) is June (0.08").
Average rainfall days in December
Onyx, CA
- Average rainfall days in December: 7.3 days
The month with the highest number of rainy days is March (10.3 days).
The month with the least rainy days is June (1.3 days).
Average snowfall in December
Onyx, CA
- Average snowfall in December: 0.71"
The month with the highest snowfall is February (3.15").
The months with the least snowfall are May, June, July, August, September and October (0").
Average snowfall days in December
Onyx, CA
- Average snowfall days in December: 1.5 days
The month with the highest number of snowfall days is February (2.7 days).
The months with the least snowfall days are May, June, July, August, September and October (0 days).
Average daylight in December /
Average sunshine in December
Onyx, CA
- Average daylight in December: 9h and 48min
The month with the longest days is June (Average daylight: 14h and 30min).
The month with the shortest days is December (Average daylight: 9h and 48min).
- Average sunshine in December: 6h and 42min
The months with the most sunshine are June and July (Average sunshine: 12h and 6min).
The months with the least sunshine are January, February and December (Average sunshine: 6h and 42min).
Average sunshine days in December
Onyx, CA
- Average sunshine days in December: 22 days
The month with the most sunshine days is June (28.3 days).
The month with the least sunshine days is February (19 days).
Average UV index in December
Onyx, CA
- Average UV index in December: 2
The months with the highest UV index are June, July and August (UV index 6).
The months with the lowest UV index are February, November and December (UV index 2).
Average cloud cover in December
Onyx, CA
- Average cloud cover in December: 23
The month with the most cloud cover is March (Cloud cover 26).
The months with the least cloud cover are August and September (Cloud cover 5).
Average visibility in December
Onyx, 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).
