December weather forecastChula Vista, CA
December
Weather in December
As winter officially sets in, December shows a marked difference in Chula Vista's weather. Compared to the sunny summer months, the city experiences a significant drop in temperature to a moderate 63.7°F (17.6°C). Covered by slightly denser clouds, the city experiences a noticeable decline in daylight hours to 10 hr. Although rainfall increases towards December end, Chula Vista continues to entertain with its endless appeal. Commemorating the year-end, the city wraps up in holiday spirit, offering a remarkable contrast to the ebullient summer past.Temperature
Chula Vista experiences its lowest average temperatures in December, reaching a peak of 63.7°F (17.6°C) and a minimum of 51.4°F (10.8°C).Humidity
In Chula Vista, the average relative humidity in December is 61%.Rainfall
In Chula Vista, during December, the rain falls for 5.3 days and regularly aggregates up to 1.06" (27mm) of precipitation. In Chula Vista, California, during the entire year, the rain falls for 51 days and collects up to 5.63" (143mm) of precipitation.Ocean temperature
In December, the average ocean temperature in Chula Vista is 60.4°F (15.8°C).Note: The enjoyment of swimming decreases for most when the surface water temperature is 60.4°F (15.8°C). Breathing control becomes increasingly challenging as temperatures descend below 69.8°F (21°C).
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 4:42 pm. On the last day of the month, sunrise is at 6:50 am and sunset at 4:53 pm PST.
Sunshine
December has the least sunshine of the year, 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 medium vulnerability from exposure to the Sun's UV rays for the average person.Note: The maximum UV index of 4 during December translates into these guidelines:
Ensure safety - Recommendations to avert sunburn are presented. Sun exposure should be minimized, especially during midday, to avoid harmful UV radiation. Sun protection is enhanced with clothing that boasts a tight weave yet offers a loose fit.
Published by: Weather U.S. | About Us
Data Sources | Weather Forecasting & Climate
Frequently asked questions
Average temperature in December
Chula Vista, CA
- Average high temperature in December: 63.7°F
The warmest month (with the highest average high temperature) is August (79.2°F).
The month with the lowest average high temperature is December (63.7°F).
- Average low temperature in December: 51.4°F
The month with the highest average low temperature is August (66.7°F).
The coldest month (with the lowest average low temperature) is February (51.1°F).
Average pressure in December
Chula Vista, 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 (29.88"Hg).
Average wind speed in December
Chula Vista, CA
- Average wind speed in December: 5.3mph
The windiest month (with the highest average wind speed) is April (6.2mph).
The calmest month (with the lowest average wind speed) is October (5mph).
Average humidity in December
Chula Vista, CA
- Average humidity in December: 61%
The month with the highest relative humidity is June (71%).
The month with the lowest relative humidity is November (58%).
Average rainfall in December
Chula Vista, CA
- Average rainfall in December: 1.06"
The wettest month (with the highest rainfall) is February (1.1").
The driest month (with the least rainfall) is June (0.08").
Average rainfall days in December
Chula Vista, CA
- Average rainfall days in December: 5.3 days
The month with the highest number of rainy days is March (7.2 days).
The month with the least rainy days is June (1.7 days).
Average sea temperature in December
Chula Vista, CA
- Average sea temperature in December: 60.4°F
The best month for swimming (with the highest average sea temperature) is August (67.9°F).
The coldest month (with the lowest average sea temperature) is February (58.7°F).
Average daylight in December /
Average sunshine in December
Chula 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 42min
The month with the most sunshine is July (Average sunshine: 12h and 0min).
The month with the least sunshine is December (Average sunshine: 6h and 42min).
Average sunshine days in December
Chula Vista, CA
- Average sunshine days in December: 24.3 days
The month with the most sunshine days is June (27.2 days).
The month with the least sunshine days is February (21.1 days).
Average UV index in December
Chula Vista, 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, March, November and December (UV index 4).
Average cloud cover in December
Chula 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 8).
Average visibility in December
Chula 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).
