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 is the coldest month, with an average high-temperature of 63.9°F (17.7°C) and an average low-temperature of 47.7°F (8.7°C).Humidity
In December, the average relative humidity is 59%.Rainfall
In Rancho Bernardo, it is raining for 6.1 days, with typically 1.46" (37mm) of accumulated 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 1min of daylight, December has the shortest days of the year in Rancho Bernardo, California.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 4:51 pm PST.
Sunshine
The months with the least sunshine in Rancho Bernardo 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 medium vulnerability from unsafe exposure to UV radiation for ordinary individuals.Note: The daily maximum UV index of 4 in December interpret into the following advice:
Take precautions. Light skin individuals may get burned in less than 30 minutes. The Sun's most intense and consequently most harmful UV radiation during midday hours should be decreased by minimizing exposure and seeking shade. On bright days sunglasses that block both UVA and UVB rays should be worn. A hat with a wide brim is extremely helpful, as it can prevent roughly 50% of UV radiation from reaching the eyes.
FAQ
What is the coldest month in Rancho Bernardo?
What is the temperature in December in Rancho Bernardo?
What is the average humidity in December in Rancho Bernardo?
How many days does it rain in December in Rancho Bernardo?
What is the month with the shortest days in Rancho Bernardo?
How many hours of daylight does Rancho Bernardo have in December?
When is the sunrise / sunset in December in Rancho Bernardo?
What are the months with the least sunshine in Rancho Bernardo?
How many hours of sunshine does Rancho Bernardo have in December?
When is the lowest UV index in Rancho Bernardo?
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 1min
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 1min).
- Average sunshine in December: 6h and 42min
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).
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