December weather forecastCarlsbad, CA
December
Weather in December
December transitions Carlsbad into full winter mode with significantly cooler temperatures. Simultaneously, residents experience shorter daylight hours and reduced sea temperatures. With drops in overall temperatures and high relative humidity, the city prepares for the New Year. Notably, the cloud percentage climbs to 25%, marking a year-round high. Consequently, with an increased amount of rainfall at 1.97" (50mm), it heralds the wet season once more.Temperature
December, with its high-temperature average of 62.4°F (16.9°C) and a low-temperature average of 50.4°F (10.2°C), is the coldest month.Humidity
In December, the average relative humidity in Carlsbad is 63%.Rainfall
December is the month with the most rainfall. Rain falls for 6.8 days and accumulates 1.97" (50mm) of precipitation.Ocean temperature
In Carlsbad, in December, the average water temperature is 60.4°F (15.8°C).Note: Swimming in water with a temperature of 60.4°F (15.8°C) is not a pleasurable experience for the majority. As the temperature falls below 69.8°F (21°C), it becomes increasingly hard to control one's breathing.
Daylight
December has the shortest days of the year, with an average of 10h and 0min of daylight.On the first day of the month, sunrise is at 6:35 am and sunset at 4:42 pm. On the last day of December, sunrise is at 6:52 am and sunset at 4:52 pm PST.
Sunshine
With an average of 6.6h of sunshine, December has the least sunshine of the year.UV index
January through March, November and December, with an average maximum UV index of 4, are months with the lowest UV index. A UV Index reading of 3 to 5 represents a moderate health risk from exposure to the Sun's UV rays for average individuals.Note: A daily maximum UV index of 4 in December translates into the following instructions:
Take care. Persons with lighter skin might suffer burns in less than 30 minutes. The most potent solar radiation is around mid-day, so one should minimize exposure to direct sunlight during this period. Consider a wide-brim hat essential for effective sun defense covering your face, neck, and eyes.
Published by: Weather U.S. | About Us
Data Sources | Weather Forecasting & Climate
Frequently asked questions
Average temperature in December
Carlsbad, CA
- Average high temperature in December: 62.4°F
The warmest month (with the highest average high temperature) is August (78.6°F).
The month with the lowest average high temperature is December (62.4°F).
- Average low temperature in December: 50.4°F
The month with the highest average low temperature is August (64.2°F).
The coldest month (with the lowest average low temperature) is February (49.6°F).
Average pressure in December
Carlsbad, 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
Carlsbad, CA
- Average wind speed in December: 5.2mph
The windiest months (with the highest average wind speed) are April and May (6mph).
The calmest month (with the lowest average wind speed) is October (4.8mph).
Average humidity in December
Carlsbad, CA
- Average humidity in December: 63%
The month with the highest relative humidity is June (73%).
The month with the lowest relative humidity is November (60%).
Average rainfall in December
Carlsbad, CA
- Average rainfall in December: 1.97"
The wettest month (with the highest rainfall) is December (1.97").
The driest month (with the least rainfall) is June (0.12").
Average rainfall days in December
Carlsbad, CA
- Average rainfall days in December: 6.8 days
The month with the highest number of rainy days is March (8 days).
The month with the least rainy days is June (2.7 days).
Average sea temperature in December
Carlsbad, CA
- Average sea temperature in December: 60.3°F
The best month for swimming (with the highest average sea temperature) is August (68°F).
The coldest months (with the lowest average sea temperature) are January and February (58.7°F).
Average daylight in December /
Average sunshine in December
Carlsbad, 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 36min
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 36min).
Average sunshine days in December
Carlsbad, CA
- Average sunshine days in December: 22.3 days
The month with the most sunshine days is October (24.2 days).
The month with the least sunshine days is February (20 days).
Average UV index in December
Carlsbad, CA
- Average UV index in December: 4
The months with the highest UV index are 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
Carlsbad, CA
- Average cloud cover in December: 25
The month with the most cloud cover is December (Cloud cover 25).
The month with the least cloud cover is August (Cloud cover 8).
Average visibility in December
Carlsbad, 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).
