December weather forecastMcKinleyville, CA
December
Weather in December
The first month of the winter, December, is still a cool month in McKinleyville, California, with temperature in the range of an average low of 42.4°F (5.8°C) and an average high of 52.7°F (11.5°C).Temperature
December is McKinleyville's coldest month, registering average high temperatures of 52.7°F (11.5°C) and lows of 42.4°F (5.8°C).Humidity
In December, the average relative humidity in McKinleyville, California, is 78%.Rainfall
December is the month with the most rainfall in McKinleyville, California. Rain falls for 15.6 days and accumulates 5.87" (149mm) of precipitation.Snowfall
January, March through December are months without snowfall in McKinleyville.Daylight
The month with the shortest days in McKinleyville is December, with an average of 9h and 18min of daylight.On the first day of the month, sunrise is at 7:22 am and sunset at 4:48 pm. On the last day of December, in McKinleyville, sunrise is at 7:40 am and sunset at 4:58 pm PST.
Sunshine
The months with the least sunshine are January and December, with an average of 5.1h 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 3. A UV Index of 3 to 5 symbolizes a medium vulnerability from unsafe exposure to UV radiation for ordinary individuals.Note: The maximum daily UV index of 3 during December translates into the following directions:
Exercise prudence. Persons with fair skin could be burned in under 30 minutes. Solar radiation is at its peak intensity during midday, so it's advisable to stay indoors or in the shade. Protect your eyes, ears, face, and neck from the Sun by wearing a wide-brimmed hat. Guard yourself! Snow reflection can almost double the UV radiation from the Sun.
Published by: Weather U.S. | About Us
Data Sources | Weather Forecasting & Climate
Frequently asked questions
Average temperature in December
McKinleyville, CA
- Average high temperature in December: 52.7°F
The warmest month (with the highest average high temperature) is August (68.9°F).
The month with the lowest average high temperature is December (52.7°F).
- Average low temperature in December: 42.4°F
The month with the highest average low temperature is August (51.4°F).
The coldest month (with the lowest average low temperature) is February (41.7°F).
Average pressure in December
McKinleyville, CA
- Average pressure in December: 30.11"Hg
The month with the highest atmospheric pressure is January (30.13"Hg).
The month with the lowest atmospheric pressure is August (29.97"Hg).
Average wind speed in December
McKinleyville, CA
- Average wind speed in December: 7.7mph
The windiest month (with the highest average wind speed) is March (8.4mph).
The calmest month (with the lowest average wind speed) is August (5.2mph).
Average humidity in December
McKinleyville, CA
- Average humidity in December: 78%
The month with the highest relative humidity is March (82%).
The months with the lowest relative humidity are September and October (76%).
Average rainfall in December
McKinleyville, CA
- Average rainfall in December: 5.87"
The wettest month (with the highest rainfall) is December (5.87").
The driest month (with the least rainfall) is July (0.08").
Average rainfall days in December
McKinleyville, CA
- Average rainfall days in December: 15.6 days
The month with the highest number of rainy days is March (16.8 days).
The months with the least rainy days are July and August (2.2 days).
Average snowfall in December
McKinleyville, CA
- Average snowfall in December: 0"
The month with the highest snowfall is February (0.39").
The months with the least snowfall are January, March, April, May, June, July, August, September, October, November and December (0").
Average snowfall days in December
McKinleyville, CA
- Average snowfall days in December: 0.1 days
The month with the highest number of snowfall days is February (0.3 days).
The months with the least snowfall days are January, March, April, May, June, July, August, September, October and November (0 days).
Average daylight in December /
Average sunshine in December
McKinleyville, CA
- Average daylight in December: 9h and 18min
The month with the longest days is June (Average daylight: 15h and 6min).
The month with the shortest days is December (Average daylight: 9h and 18min).
- Average sunshine in December: 5h and 6min
The month with the most sunshine is July (Average sunshine: 11h and 30min).
The months with the least sunshine are January and December (Average sunshine: 5h and 6min).
Average sunshine days in December
McKinleyville, CA
- Average sunshine days in December: 14.7 days
The months with the most sunshine days are July and August (28 days).
The month with the least sunshine days is March (12.5 days).
Average UV index in December
McKinleyville, CA
- Average UV index in December: 3
The months with the highest UV index are June, July and August (UV index 5).
The months with the lowest UV index are January, February, March, November and December (UV index 3).
Average cloud cover in December
McKinleyville, CA
- Average cloud cover in December: 45
The month with the most cloud cover is March (Cloud cover 48).
The months with the least cloud cover are July and August (Cloud cover 18).
Average visibility in December
McKinleyville, CA
- Average visibility in December: 6mi
The months with the highest visibility are January, February, March, April, May, June, September, October, November and December (6mi).
The months with the lowest visibility are July and August (5mi).
