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
The month of December, characterized by an average high of 62.6°F (17°C) and a low of 48.9°F (9.4°C), is recognized as the coldest.Humidity
In December, the average relative humidity is 61%.Rainfall
The month with the most rainfall is December, when the rain falls for 7.2 days and typically aggregates up to 1.85" (47mm) of precipitation.Daylight
With an average of 10h and 0min of daylight, December has the shortest days of the year.On the first day of the month, sunrise is at 6:34 am and sunset at 4:41 pm. On the last day of December, sunrise is at 6:52 am and sunset at 4:52 pm PST.
Sunshine
The month with the least sunshine is December, with an average of 6.7h of sunshine.UV index
The months with the lowest UV index are January through March, November and December, with an average maximum UV index of 4. A UV Index of 3 to 5 symbolizes a moderate threat to health from exposure to the Sun's UV radiation for the average person.Note: A daily maximum UV index of 4 in December translates into the following instructions:
Act with care - Obligation to protect against skin and eye damage is highlighted. It's crucial to reduce time in the direct Sun around mid-day due to the intense solar radiation. Employ a wide-brim hat for potent defense against up to 50% of UV rays.
Published by: Weather U.S. | About Us
Data Sources | Weather Forecasting & Climate
Frequently asked questions
What time of the year is the coldest?
What are the temperatures in December?
What is the average humidity in December?
What is the rainiest month?
How many days does it rain in December?
What is the month with the shortest days?
How many hours of daylight does Vista have in December?
What time are sunrise and sunset in December?
What is the month with the least sunshine in Vista?
How long on average sun shines in December?
What are the months with the lowest UV index?
What is the UV index reading in December?
Average temperature in December
Vista, CA
- Average high temperature in December: 62.6°F
The warmest month (with the highest average high temperature) is August (81.1°F).
The month with the lowest average high temperature is December (62.6°F).
- Average low temperature in December: 48.9°F
The month with the highest average low temperature is August (63.9°F).
The coldest month (with the lowest average low temperature) is February (48.4°F).
Average pressure in December
Vista, CA
- Average pressure in December: 30.06"Hg
The month with the highest atmospheric pressure is January (30.09"Hg).
The month with the lowest atmospheric pressure is June (29.87"Hg).
Average wind speed in December
Vista, CA
- Average wind speed in December: 5mph
The windiest month (with the highest average wind speed) is April (5.8mph).
The calmest month (with the lowest average wind speed) is October (4.5mph).
Average humidity in December
Vista, CA
- Average humidity in December: 61%
The month with the highest relative humidity is May (70%).
The month with the lowest relative humidity is November (57%).
Average rainfall in December
Vista, CA
- Average rainfall in December: 1.85"
The wettest month (with the highest rainfall) is December (1.85").
The driest month (with the least rainfall) is June (0.08").
Average rainfall days in December
Vista, CA
- Average rainfall days in December: 7.2 days
The month with the highest number of rainy days is March (8.3 days).
The month with the least rainy days is June (1.6 days).
Average daylight in December /
Average sunshine in December
Vista, CA
- Average daylight in December: 10h and 0min
The month with the longest days is June (Average daylight: 14h and 18min).
The month with the shortest days is December (Average daylight: 10h and 0min).
- Average sunshine in December: 6h and 4min
The months with the most sunshine are July and August (Average sunshine: 12h and 0min).
The month with the least sunshine is December (Average sunshine: 6h and 42min).
Average sunshine days in December
Vista, CA
- Average sunshine days in December: 22.1 days
The month with the most sunshine days is October (24.6 days).
The month with the least sunshine days is February (19.7 days).
Average UV index in December
Vista, CA
- Average UV index in December: 4
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, March, November and December (UV index 4).
Average cloud cover in December
Vista, CA
- Average cloud cover in December: 23
The months with the most cloud cover are March and December (Cloud cover 23).
The month with the least cloud cover is August (Cloud cover 7).
Average visibility in December
Vista, 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).
Vista, California, USA
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