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
The coldest period is December, when temperatures fluctuate between an average high of 62.4°F (16.9°C) and a low of 53.8°F (12.1°C).Humidity
In December, the average relative humidity is 60%.Rainfall
In Harbor City, during December, the rain falls for 5.9 days and regularly aggregates up to 1.22" (31mm) of precipitation. In Harbor City, during the entire year, the rain falls for 57.9 days and collects up to 6.65" (169mm) of precipitation.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 6:40 am and sunset at 4:44 pm. On the last day of December, sunrise is at 6:57 am and sunset at 4:55 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 value of 3 to 5 symbolizes a medium vulnerability from unsafe exposure to UV radiation for average individuals.Note: The maximum daily UV index of 4 during December translates into the following directions:
Put precautions into practice - Guidance to elude sunburn is provided. Direct exposure to the Sun during its peak hours around mid-day should be minimized for safety. A wide-brim hat offers excellent sun protection for the eyes, ears, face, and neck. Sunglasses with UVA and UVB protection significantly reduce eye damage from sun exposure.
Published by: Weather U.S. | About Us
Data Sources | Weather Forecasting & Climate
Frequently asked questions
What part of the year is the coldest?
What is the average December temperature?
What is the average humidity in December?
How many days does it rain in December?
What is the month with the shortest days in Harbor City?
What is the average length of the day in December?
When is the sunrise / sunset in December in Harbor City?
What is the month with the least sunshine?
How long on average sun shines in December in Harbor City?
What is the month with the lowest UV index?
What is the UV index intensity in December?
Average temperature in December
Harbor City, CA
- Average high temperature in December: 62.4°F
The warmest months (with the highest average high temperature) are August and September (75.9°F).
The month with the lowest average high temperature is December (62.4°F).
- Average low temperature in December: 53.8°F
The month with the highest average low temperature is September (64.2°F).
The coldest month (with the lowest average low temperature) is February (52.7°F).
Average pressure in December
Harbor City, CA
- Average pressure in December: 30.07"Hg
The month with the highest atmospheric pressure is January (30.1"Hg).
The months with the lowest atmospheric pressure are June and September (29.9"Hg).
Average wind speed in December
Harbor City, CA
- Average wind speed in December: 6mph
The windiest month (with the highest average wind speed) is April (7mph).
The calmest month (with the lowest average wind speed) is September (5.3mph).
Average humidity in December
Harbor City, CA
- Average humidity in December: 60%
The month with the highest relative humidity is June (75%).
The month with the lowest relative humidity is November (58%).
Average rainfall in December
Harbor City, CA
- Average rainfall in December: 1.22"
The wettest month (with the highest rainfall) is January (1.3").
The driest month (with the least rainfall) is June (0.12").
Average rainfall days in December
Harbor City, CA
- Average rainfall days in December: 5.9 days
The month with the highest number of rainy days is March (7.3 days).
The month with the least rainy days is August (3 days).
Average daylight in December /
Average sunshine in December
Harbor City, CA
- Average daylight in December: 10h and 0min
The month with the longest days is June (Average daylight: 14h and 24min).
The month with the shortest days is December (Average daylight: 10h and 0min).
- Average sunshine in December: 6h and 4min
The month with the most sunshine is August (Average sunshine: 11h and 54min).
The month with the least sunshine is December (Average sunshine: 6h and 42min).
Average sunshine days in December
Harbor City, CA
- Average sunshine days in December: 23.2 days
The month with the most sunshine days is January (24.2 days).
The month with the least sunshine days is June (17.7 days).
Average UV index in December
Harbor City, 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
Harbor City, CA
- Average cloud cover in December: 23
The month with the most cloud cover is December (Cloud cover 23).
The month with the least cloud cover is August (Cloud cover 9).
Average visibility in December
Harbor City, 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).
Harbor City, California, USA
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