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 snowfall in December
- Average snowfall 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 is the coldest month of the year, registering average temperatures as high as 54.9°F (12.7°C) and as low as 38.5°F (3.6°C).Humidity
In December, the average relative humidity is 75%.Rainfall
In Asti, in December, during 12.1 rainfall days, 3.66" (93mm) of precipitation is typically accumulated. Throughout the year, there are 82.4 rainfall days, and 20.75" (527mm) of precipitation is accumulated.Snowfall
January, March through December are months without snowfall.Daylight
With an average of 9h and 30min of daylight, December has the shortest days of the year.On the first day of December, sunrise is at 7:11 am and sunset at 4:50 pm. On the last day of the month, sunrise is at 7:29 am and sunset at 5:00 pm PST.
Sunshine
The month with the least sunshine is December, with an average of 5.4h of sunshine.UV index
The average daily maximum UV index in December is 3. A UV Index value of 3 to 5 symbolizes a medium vulnerability from unprotected exposure to Sun's UV rays for ordinary individuals.Note: An average UV index of 3 in December transforms into this advice:
Take necessary precautions - Suggestions to elude sunburn are provided. Avoiding direct sun during mid-day hours can prevent harmful UV radiation exposure. Equip yourself with UVA and UVB-filtering sunglasses on clear, sunny days.
Published by: Weather U.S. | About Us
Data Sources | Weather Forecasting & Climate
Frequently asked questions
What is the coldest month?
What are December temperatures in Asti?
What is the average humidity in December?
How much does it rain in December?
When it does not snow?
What is the month with the shortest days?
What is the average length of the day in December?
When is the sunrise / sunset in December?
What is the month with the least sunshine?
How long on average sun shines in December in Asti?
How high is the UV index in December?
Average temperature in December
Asti, CA
- Average high temperature in December: 54.9°F
The warmest month (with the highest average high temperature) is July (86.2°F).
The month with the lowest average high temperature is December (54.9°F).
- Average low temperature in December: 38.5°F
The month with the highest average low temperature is August (54.1°F).
The coldest month (with the lowest average low temperature) is December (38.5°F).
Average pressure in December
Asti, 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, August and September (29.92"Hg).
Average wind speed in December
Asti, CA
- Average wind speed in December: 4.8mph
The windiest month (with the highest average wind speed) is May (6.3mph).
The calmest month (with the lowest average wind speed) is November (4.6mph).
Average humidity in December
Asti, CA
- Average humidity in December: 75%
The month with the highest relative humidity is March (77%).
The months with the lowest relative humidity are July and September (57%).
Average rainfall in December
Asti, CA
- Average rainfall in December: 3.66"
The wettest month (with the highest rainfall) is February (4.25").
The driest months (with the least rainfall) are July and August (0.04").
Average rainfall days in December
Asti, CA
- Average rainfall days in December: 12.1 days
The month with the highest number of rainy days is March (14.6 days).
The months with the least rainy days are July and August (1.2 days).
Average snowfall in December
Asti, CA
- Average snowfall in December: 0"
The month with the highest snowfall is February (0.16").
The months with the least snowfall are January, March, April, May, June, July, August, September, October, November and December (0").
Average snowfall days in December
Asti, CA
- Average snowfall days in December: 0 days
The month with the highest number of snowfall days is February (0.2 days).
The months with the least snowfall days are January, March, April, May, June, July, August, September, October, November and December (0 days).
Average daylight in December /
Average sunshine in December
Asti, CA
- Average daylight in December: 9h and 3min
The month with the longest days is June (Average daylight: 14h and 48min).
The month with the shortest days is December (Average daylight: 9h and 30min).
- Average sunshine in December: 5h and 2min
The month with the most sunshine is July (Average sunshine: 12h and 0min).
The month with the least sunshine is December (Average sunshine: 5h and 24min).
Average sunshine days in December
Asti, CA
- Average sunshine days in December: 18 days
The month with the most sunshine days is July (29.4 days).
The month with the least sunshine days is March (15.2 days).
Average UV index in December
Asti, CA
- Average UV index in December: 3
The months with the highest UV index are June, July and August (UV index 6).
The month with the lowest UV index is November (UV index 2).
Average cloud cover in December
Asti, CA
- Average cloud cover in December: 41
The month with the most cloud cover is March (Cloud cover 43).
The months with the least cloud cover are July and August (Cloud cover 6).
Average visibility in December
Asti, 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).
Asti, California, USA
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