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
December
Weather in December
Temperature
With average high temperatures of 63.9°F (17.7°C) and lows of 47.7°F (8.7°C), December is the coldest month.Humidity
In December, the average relative humidity is 59%.Rainfall
In Rancho Bernardo, during December, the rain falls for 6.1 days and regularly aggregates up to 1.46" (37mm) of precipitation. In Rancho Bernardo, during the entire year, the rain falls for 54.7 days and collects up to 8.15" (207mm) 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 December, sunrise is at 6:33 am and sunset at 4:41 pm. On the last day of the month, sunrise is at 6:51 am and sunset at 4:52 pm PST.
Sunshine
The months with the least sunshine are January and December, with an average of 6.7h of sunshine.UV index
January, February, November and December, with an average maximum UV index of 4, are months with the lowest UV index. A UV Index of 3 to 5 symbolizes a moderate threat to health from exposure to the Sun's UV radiation for the ordinary person.Note: In December, the maximum UV index of 4 suggests these recommendations:
Take precautions - Protection against sunburn is recommended. Avoid the Sun's strongest UV rays by seeking shade and limiting exposure during midday. On days when the sun blazes, arm yourself with sunglasses that block UVA and UVB radiation.
Published by: Weather U.S. | About Us
Data Sources | Weather Forecasting & Climate
Frequently asked questions
What month is the coldest?
What is the temperature in December?
What is the average humidity in December?
How many days does it rain in December?
What is the month with the shortest days?
How many hours of daylight does Rancho Bernardo have in December?
When are sunrise and sunset in December?
What is the month with the least sunshine?
How long on average sun shines in December?
When is the lowest UV index?
What is the UV index intensity in December in Rancho Bernardo?
Average temperature in December
Rancho Bernardo, CA
- Average high temperature in December: 63.9°F
The warmest month (with the highest average high temperature) is August (84.2°F).
The month with the lowest average high temperature is December (63.9°F).
- Average low temperature in December: 47.7°F
The month with the highest average low temperature is August (64.4°F).
The coldest month (with the lowest average low temperature) is February (47.1°F).
Average pressure in December
Rancho Bernardo, CA
- Average pressure in December: 30.06"Hg
The month with the highest atmospheric pressure is January (30.09"Hg).
The months with the lowest atmospheric pressure are June and September (29.87"Hg).
Average wind speed in December
Rancho Bernardo, CA
- Average wind speed in December: 5mph
The windiest month (with the highest average wind speed) is April (5.5mph).
The calmest months (with the lowest average wind speed) are September and October (4.3mph).
Average humidity in December
Rancho Bernardo, CA
- Average humidity in December: 59%
The month with the highest relative humidity is May (68%).
The month with the lowest relative humidity is November (54%).
Average rainfall in December
Rancho Bernardo, CA
- Average rainfall in December: 1.46"
The wettest month (with the highest rainfall) is February (1.61").
The driest month (with the least rainfall) is June (0.08").
Average rainfall days in December
Rancho Bernardo, CA
- Average rainfall days in December: 6.1 days
The month with the highest number of rainy days is March (7.2 days).
The month with the least rainy days is June (1.6 days).
Average daylight in December /
Average sunshine in December
Rancho Bernardo, 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 month with the most sunshine is July (Average sunshine: 12h and 0min).
The months with the least sunshine are January and December (Average sunshine: 6h and 42min).
Average sunshine days in December
Rancho Bernardo, CA
- Average sunshine days in December: 23.5 days
The month with the most sunshine days is June (27 days).
The month with the least sunshine days is February (21.2 days).
Average UV index in December
Rancho Bernardo, CA
- Average UV index in December: 4
The months with the highest UV index are June, July, August and September (UV index 6).
The months with the lowest UV index are January, February, November and December (UV index 4).
Average cloud cover in December
Rancho Bernardo, CA
- Average cloud cover in December: 23
The month with the most cloud cover is March (Cloud cover 24).
The month with the least cloud cover is August (Cloud cover 7).
Average visibility in December
Rancho Bernardo, 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).