December weather forecast and climate
Granite Bay, CA

Weather in December

The first month of the winter, December, is also a fresh month in Granite Bay, California, with average temperature varying between 39.6°F (4.2°C) and 54°F (12.2°C).

Temperature

With an average high-temperature of 54°F (12.2°C) and an average low-temperature of 39.6°F (4.2°C), December is the coldest month.

Humidity

The average relative humidity in December is 69%.

Rainfall

In Granite Bay, during December, the rain falls for 11.3 days and regularly aggregates up to 3.78" (96mm) of precipitation. Throughout the year, there are 81.2 rainfall days, and 22.64" (575mm) of precipitation is accumulated.

Snowfall

February and December are months with snowfall. Months with the most snowfall in Granite Bay are February and December, with an average 0.04" (1mm) of accumulated snow.

Daylight

December has the shortest days of the year in Granite Bay, with an average of 9.5h of daylight.

Sunshine

With an average of 5.8h of sunshine, December has the least sunshine of the year in Granite Bay, California.

UV index

Months with the lowest UV index are January, February, November and December, with an average maximum UV index of 3. A UV Index value of 3 to 5 symbolizes a medium vulnerability from unprotected exposure to the Sun's UV rays for ordinary individuals.
Note: In December, the average maximum UV index of 3 translate into the following recommendations:
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. A wide-brim hat offers excellent sun protection for eyes, ears, face, and neck. Sunglasses with UVA and UVB protection significantly reduce eye damage from sun exposure. Tightly woven, loose-fitting clothes provide additional protection from the Sun. 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 Granite Bay?

The coldest month in Granite Bay, California, is December, with an average high-temperature of 54°F (12.2°C) and an average low-temperature of 39.6°F (4.2°C).

What is the temperature in December in Granite Bay?

In December, the average high-temperature is 54°F (12.2°C), and the average low-temperature is 39.6°F (4.2°C).

What is the average humidity in December in Granite Bay?

In Granite Bay, the average relative humidity in December is 69%.

How many days does it rain in December in Granite Bay?

In Granite Bay, California, during December, the rain falls for 11.3 days and regularly aggregates up to 3.78" (96mm) of precipitation.

When does it start snowing in Granite Bay?

December is the first month it typically snows in Granite Bay. Throughout December, in the average 0.2 snowfall days, it receives 0.04" (1mm) of snow.

What is the snowiest month in Granite Bay?

Months with the most snowfall are February and December, with an average 0.04" (1mm) of accumulated snow.

What is the month with the shortest days in Granite Bay?

The month with the shortest days in Granite Bay, California, is December, with an average of 9.5h of daylight.

What is the average length of the day in December in Granite Bay?

The average length of the day in December in Granite Bay, California, is 9.5h.

What is the month with the least sunshine in Granite Bay?

With an average of 5.8h of sunshine, December has the least sunshine of the year.

How many hours of sunshine does Granite Bay have in December?

The average sunshine in December in Granite Bay, California, is 5.8h.

When is the lowest UV index in Granite Bay?

Months with the lowest UV index in Granite Bay are January, February, November and December, with an average maximum UV index of 3.

What is the UV index reading in December in Granite Bay?

In December, the average daily maximum UV index in Granite Bay is 3. A UV Index estimate of 3 to 5 represents a medium health risk from unsafe exposure to the Sun's UV rays.

Average temperature in December
Granite Bay, CA

Average temperature in December - Granite Bay, CA
  • Average high temperature in December: 54°F

The warmest month (with the highest average high temperature) is July (93°F).
The month with the lowest average high temperature is December (54°F).

  • Average low temperature in December: 39.6°F

The month with the highest average low temperature is July (60.3°F).
The coldest month (with the lowest average low temperature) is December (39.6°F).

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Average pressure in December
Granite Bay, CA

Average pressure in December - Granite Bay, CA
  • Average pressure in December: 30.13"

The month with the highest atmospheric pressure is January (30.16").
The month with the lowest atmospheric pressure is June (29.9").

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Average wind speed in December
Granite Bay, CA

Average wind speed in December - Granite Bay, CA
  • Average wind speed in December: 4.8mph

The windiest month (with the highest average wind speed) is February (5.5mph).
The calmest months (with the lowest average wind speed) are August and September (4mph).

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Average humidity in December
Granite Bay, CA

Average humidity in December - Granite Bay, CA
  • Average humidity in December: 69%

The month with the highest relative humidity is March (74%).
The month with the lowest relative humidity is July (40%).

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Average rainfall in December
Granite Bay, CA

Average rainfall in December - Granite Bay, CA
  • Average rainfall in December: 3.78"

The wettest month (with the highest rainfall) is March (4.33").
The driest months (with the least rainfall) are July and August (0.04").

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Average rainfall days in December
Granite Bay, CA

Average rainfall days in December - Granite Bay, CA
  • Average rainfall days in December: 11.3 days

The month with the highest number of rainy days is March (14.6 days).
The month with the least rainy days is July (1 days).

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Average snowfall in December
Granite Bay, CA

Average snowfall in December - Granite Bay, CA
  • Average snowfall in December: 0.04"

Months with the highest snowfall are February and December (0.04").
Months with the least snowfall are January, March, April, May, June, July, August, September, October and November (0").

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Average snowfall days in December
Granite Bay, CA

Average snowfall days in December - Granite Bay, CA
  • Average snowfall days in December: 0.2 days

The month with the highest number of snowfall days is December (0.2 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
Granite Bay, CA

Average daylight in December / Average sunshine in December - Granite Bay, CA
  • Average daylight in December: 9.5h

The month with the longest days is June (Average daylight: 14.8h).
The month with the shortest days is December (Average daylight: 9.5h).

  • Average sunshine in December: 5.8h

The month with the most sunshine is July (Average sunshine: 12.1h).
The month with the least sunshine is December (Average sunshine: 5.8h).

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Average sunshine days in December
Granite Bay, CA

Average sunshine days in December - Granite Bay, CA
  • Average sunshine days in December: 19.3 days

The month with the most sunshine days is July (29.2 days).
The month with the least sunshine days is March (15.7 days).

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Average UV index in December
Granite Bay, CA

Average UV index in December - Granite Bay, CA
  • Average UV index in December: 3

Months with the highest UV index are June and July (UV index 7).
Months with the lowest UV index are January, February, November and December (UV index 3).

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Average cloud cover in December
Granite Bay, CA

Average cloud cover in December - Granite Bay, CA
  • Average cloud cover in December: 34

The month with the most cloud cover is March (Cloud cover 38).
The month with the least cloud cover is July (Cloud cover 4).

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Average visibility in December
Granite Bay, CA

Average visibility in December - Granite Bay, CA
  • Average visibility in December: 6mi

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

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