December weather forecast and climate
McKinleyville, CA

Weather in December

The first month of the winter, December, is still a cool month in McKinleyville, California, with average temperature varying between 52.7°F (11.5°C) and 42.4°F (5.8°C).

Temperature

December is the coldest month, with an average high-temperature of 52.7°F (11.5°C) and an average low-temperature of 42.4°F (5.8°C).

Humidity

The average relative humidity in December is 78%.

Rainfall

December is the month with the most rainfall. Rain falls for 15.6 days and accumulates 5.87" (149mm) of precipitation.

Snowfall

January, March through December are months without snowfall.

Daylight

With an average of 9.3h of daylight, December has the shortest days of the year in McKinleyville.

Sunshine

Months with the least sunshine are January and December, with an average of 5.1h of sunshine.

UV index

January through March, November and December, with an average maximum UV index of 3, are months with the lowest UV index in McKinleyville. A UV Index reading of 3 to 5 represents a moderate health risk from the exposure to the Sun's UV rays for the ordinary person.
Note: The daily maximum UV index of 3 interpret into the following advice:
Take precautions. Light skin individuals may get burned in less than 30 minutes. The solar radiation is most powerful near the mid-day, so the exposure to the direct Sun should be reduced accordingly. On bright days sunglasses that block both UVA and UVB rays should be worn. A hat with a wide brim is extremely helpful, as it can prevent roughly 50% of UV radiation from reaching the eyes. Caution! The reflection of snow can nearly double the intensity of the Sun's UV radiation.
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FAQ

What is the coldest month in McKinleyville?

December is the coldest month in McKinleyville, with an average high-temperature of 52.7°F (11.5°C) and an average low-temperature of 42.4°F (5.8°C).

What is the temperature in December in McKinleyville?

In December, the average high-temperature is 52.7°F (11.5°C), and the average low-temperature is 42.4°F (5.8°C).

What is the average humidity in December in McKinleyville?

In McKinleyville, the average relative humidity in December is 78%.

How many days does it rain in December in McKinleyville?

In McKinleyville, in December, it is raining for 15.6 days, with typically 5.87" (149mm) of accumulated precipitation.

What is the rainiest month in McKinleyville?

The month with the most rainfall in McKinleyville, California, is December when the rain falls for 15.6 days and typically aggregates up to 5.87" (149mm) of precipitation.

When it does not snow in McKinleyville?

In McKinleyville, California, snow does not fall in January, March through December.

What is the month with the shortest days in McKinleyville?

With an average of 9.3h of daylight, December has the shortest days of the year in McKinleyville, California.

How many hours of daylight does McKinleyville have in December?

In December, the average length of the day in McKinleyville is 9.3h.

What is the month with the least sunshine in McKinleyville?

January and December, with an average of 5.1h of sunshine, are months with the least sunshine in McKinleyville.

How long on average sun shines in December in McKinleyville?

The average sunshine in December is 5.1h.

What is the month with the lowest UV index in McKinleyville?

Months with the lowest UV index in McKinleyville are January through March, November and December, with an average maximum UV index of 3.

What is the UV index reading in December in McKinleyville?

The average daily maximum UV index in December in McKinleyville, California, is 3. A UV Index reading of 3 to 5 represents a medium health risk from unsafe exposure to the Sun's UV rays.

Average temperature in December
McKinleyville, CA

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).

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Average pressure in December
McKinleyville, CA

Average pressure in December - McKinleyville, CA
  • Average pressure in December: 30.11"

The month with the highest atmospheric pressure is January (30.13").
The month with the lowest atmospheric pressure is August (29.97").

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Average wind speed in December
McKinleyville, CA

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).

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Average humidity in December
McKinleyville, CA

Average humidity in December - McKinleyville, CA
  • Average humidity in December: 78%

The month with the highest relative humidity is March (82%).
Months with the lowest relative humidity are September and October (76%).

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Average rainfall in December
McKinleyville, CA

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").

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Average rainfall days in December
McKinleyville, CA

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).
Months with the least rainy days are July and August (2.2 days).

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Average snowfall in December
McKinleyville, CA

Average snowfall in December - McKinleyville, CA
  • Average snowfall in December: 0"

The month with the highest snowfall is February (0.39").
Months with the least snowfall are January, March, April, May, June, July, August, September, October, November and December (0").

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Average snowfall days in December
McKinleyville, CA

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).
Months with the least snowfall days are January, March, April, May, June, July, August, September, October and November (0 days).

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Average daylight in December /
Average sunshine in December
McKinleyville, CA

Average daylight in December / Average sunshine in December - McKinleyville, CA
  • Average daylight in December: 9.3h

The month with the longest days is June (Average daylight: 15.1h).
The month with the shortest days is December (Average daylight: 9.3h).

  • Average sunshine in December: 5.1h

The month with the most sunshine is July (Average sunshine: 11.5h).
Months with the least sunshine are January and December (Average sunshine: 5.1).

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Average sunshine days in December
McKinleyville, CA

Average sunshine days in December - McKinleyville, CA
  • Average sunshine days in December: 14.7 days

Months with the most sunshine days are July and August (28 days).
The month with the least sunshine days is March (12.5 days).

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Average UV index in December
McKinleyville, CA

Average UV index in December - McKinleyville, CA
  • Average UV index in December: 3

Months with the highest UV index are June, July and August (UV index 5).
Months with the lowest UV index are January, February, March, November and December (UV index 3).

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Average cloud cover in December
McKinleyville, CA

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).
Months with the least cloud cover are July and August (Cloud cover 18).

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Average visibility in December
McKinleyville, CA

Average visibility in December - McKinleyville, CA
  • Average visibility in December: 6mi

Months with the highest visibility are January, February, March, April, May, June, September, October, November and December (6mi).
Months with the lowest visibility are July and August (5mi).

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