December weather forecastOceanside, CA
December
Weather in December
The first month of the winter, December, is still a comfortable month in Oceanside, California, with temperature in the range of an average low of 50.4°F (10.2°C) and an average high of 62.4°F (16.9°C).Temperature
With average temperatures fluctuating between a high of 62.4°F (16.9°C) and a low of 50.4°F (10.2°C), December stands out as the coldest month.Humidity
In Oceanside, the average relative humidity in December is 63%.Rainfall
The month with the most rainfall is December, when the rain falls for 6.8 days and typically aggregates up to 1.97" (50mm) of precipitation.Ocean temperature
In Oceanside, in December, the average water temperature is 60.4°F (15.8°C).Note: Most people do not take pleasure in swimming in water at 60.4°F (15.8°C). The difficulty of managing breathing increases as the water temperature dips from 69.8°F (21°C) to 59°F (15°C).
Daylight
December has the shortest days of the year in Oceanside, 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
The month with the least sunshine in Oceanside is December, with an average of 6.6h of sunshine.UV index
The months with the lowest UV index in Oceanside are January through March, November and December, with an average maximum UV index of 4. A UV Index reading of 3 to 5 represents a moderate threat to health from unprotected exposure to Sun's UV rays for the average person.Note: The maximum UV index of 4 during December translates into these guidelines:
Take precautions - Protection against sun damage is advised. Avoiding the Sun's peak radiation during midday hours is essential for health and safety. Enhance your sun protection with tightly woven, yet airy clothing.
Published by: Weather U.S. | About Us
Data Sources | Weather Forecasting & Climate
Frequently asked questions
Average temperature in December
Oceanside, 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
Oceanside, 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
Oceanside, 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
Oceanside, 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
Oceanside, 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
Oceanside, 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
Oceanside, 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
Oceanside, 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
Oceanside, 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
Oceanside, 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
Oceanside, 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
Oceanside, 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).
