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 the advent of December, California's high-temperatures adjust to a still moderately hot 28.7°C (83.7°F), closely aligning with the preceding month. Night temperatures during December in California stabilize at an average of 25.4°C (77.7°F), closely mirroring the daytime temperatures.Heat index
The heat index in December is appraised at a hot 34°C (93.2°F). Adopt enhanced safety measures, heat exhaustion and heat cramps could occur. Continuous activity may induce heatstroke.It is worth noting that heat index values are gauged for conditions in the shade and light breezes. The heat index values could be amplified by up to 15 Fahrenheit (8 Celsius) degrees in direct sunlight.
Note: The heat index, also known as 'apparent temperature' or 'real feel', comes about by integrating the temperature readings with the humidity levels. This effect is personal, shaped by the individual's physical activity and heat sensitivity, influenced by factors including wind, clothing, and metabolic variances. You should know that direct sun exposure can heighten weather effects, potentially elevating the heat index by 15 Fahrenheit (8 Celsius) degrees. Heat index values remain especially vital for babies and toddlers. Kids are usually more vulnerable than adults, given their lesser sweating ability. Along with their larger skin surface relative to their small stature and the excess heat due to their activity, their risk is amplified.
Humidity
The months with the highest humidity are July, November and December, with an average relative humidity of 78%.Rainfall
In California, during December, the rain falls for 16.6 days and regularly aggregates up to 48mm (1.89") of precipitation. In California, during the entire year, the rain falls for 202.6 days and collects up to 599mm (23.58") of precipitation.Daylight
December has the shortest days of the year in California, with an average of 11h and 30min of daylight.On the first day of the month, sunrise is at 06:08 and sunset at 17:41. On the last day of December, sunrise is at 06:23 and sunset at 17:55 AST.
Sunshine
The month with the least sunshine in California is December, with an average of 6.7h of sunshine.UV index
The months with the highest UV index in California are January through December, with an average maximum UV index of 7. The months with the lowest UV index are January through December, with an average maximum UV index of 7. A UV Index estimate of 6 to 7 represents a high health vulnerability from unsafe exposure to UV radiation for the average person.Note: A daily high UV index of 7 in December leads to these guidelines:
Use measures and accept sun safety conventions. Guarding against skin and eye trauma is of high priority. The Sun's UV radiation is at its strongest between the hours of 10 a.m. and 4 p.m. Minimize direct exposure to the sun during this period. Employ a hat with a wide brim for robust protection, cutting UV exposure by half.
Published by: Weather Atlas | About Us
Data Sources | Weather Forecasting & Climate
Frequently asked questions
How hot is December in California?
What is the most humid month in California?
What is the average humidity in December in California?
How much does it rain in California in December?
What is the month with the shortest days in California?
What is the average length of the day in December in California?
When are sunrise and sunset in December in California?
What is the month with the least sunshine in California?
How many hours of sunshine does California have in December?
What are the months with the highest UV index in California?
What is the month with the lowest UV index in California?
What is the UV index intensity in December in California?
Average temperature in December
California, Trinidad and Tobago
- Average high temperature in December: 28.7°C
The warmest month (with the highest average high temperature) is September (30.5°C).
The month with the lowest average high temperature is January (28.2°C).
- Average low temperature in December: 25.4°C
The months with the highest average low temperature are September and October (26.5°C).
The coldest month (with the lowest average low temperature) is February (24.7°C).
Average pressure in December
California, Trinidad and Tobago
- Average pressure in December: 1012.1mbar
The month with the highest atmospheric pressure is June (1013.7mbar).
The month with the lowest atmospheric pressure is November (1010.3mbar).
Average wind speed in December
California, Trinidad and Tobago
- Average wind speed in December: 15.6km/h
The windiest month (with the highest average wind speed) is May (17km/h).
The calmest month (with the lowest average wind speed) is August (12.6km/h).
Average humidity in December
California, Trinidad and Tobago
- Average humidity in December: 78%
The months with the highest relative humidity are July, November and December (78%).
The months with the lowest relative humidity are March and April (74%).
Average rainfall in December
California, Trinidad and Tobago
- Average rainfall in December: 48mm
The wettest month (with the highest rainfall) is August (97mm).
The driest month (with the least rainfall) is April (17mm).
Average rainfall days in December
California, Trinidad and Tobago
- Average rainfall days in December: 16.6 days
The month with the highest number of rainy days is July (22.7 days).
The month with the least rainy days is April (11.6 days).
Average daylight in December /
Average sunshine in December
California, Trinidad and Tobago
- Average daylight in December: 11h and 3min
The month with the longest days is June (Average daylight: 12h and 42min).
The month with the shortest days is December (Average daylight: 11h and 30min).
- Average sunshine in December: 6h and 4min
The months with the most sunshine are August and September (Average sunshine: 11h and 6min).
The month with the least sunshine is December (Average sunshine: 6h and 42min).
Average sunshine days in December
California, Trinidad and Tobago
- Average sunshine days in December: 11.5 days
The month with the most sunshine days is April (14.3 days).
The month with the least sunshine days is July (5.6 days).
Average UV index in December
California, Trinidad and Tobago
- Average UV index in December: 7
The months with the highest UV index are January, February, March, April, May, June, July, August, September, October, November and December (UV index 7).
The months with the lowest UV index are January, February, March, April, May, June, July, August, September, October, November and December (UV index 7).
Average cloud cover in December
California, Trinidad and Tobago
- Average cloud cover in December: 38
The month with the most cloud cover is June (Cloud cover 42).
The month with the least cloud cover is September (Cloud cover 27).
Average visibility in December
California, Trinidad and Tobago
- Average visibility in December: 10km
The months with the highest visibility are January, February, March, April, May, June, July, August, September, October, November and December (10km).
The months with the lowest visibility are January, February, March, April, May, June, July, August, September, October, November and December (10km).
