December weather forecast and climate
Foresthill, CA

Weather in December

The first month of the winter, December, is still a chilly month in Foresthill, California, with average temperature varying between 34.2°F (1.2°C) and 49.1°F (9.5°C).

Temperature

December is the coldest month, with an average high-temperature of 49.1°F (9.5°C) and an average low-temperature of 34.2°F (1.2°C).

Humidity

In December, the average relative humidity in Foresthill, California, is 69%.

Rainfall

In Foresthill, during December, the rain falls for 11 days and regularly aggregates up to 5.59" (142mm) of precipitation. Throughout the year, in Foresthill, California, there are 85.5 rainfall days, and 35.94" (913mm) of precipitation is accumulated.

Snowfall

Months with snowfall are January through May, November and December. In Foresthill, during 3.9 snowfall days, 4.96" (126mm) of snow is typically accumulated. Throughout the year, in Foresthill, California, there are 22.8 snowfall days, and 56.06" (1424mm) of snow is accumulated.

Daylight

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

Sunshine

In Foresthill, the average sunshine in December is 5.8h.

UV index

Months with the lowest UV index in Foresthill are February, November and December, with an average maximum UV index of 2. A UV Index value of 2, and less, symbolizes a low threat to health from unprotected exposure to the Sun's UV rays for ordinary individuals.
Note: In December, the average maximum UV index of 2 translate into the following recommendations:
People with sensitive skin, children, and babies should always be protected from prolonged sun exposure. 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. Beware! The strength of the UV rays is increased nearly double-fold by the reflection of the snow.
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FAQ

What is the coldest month in Foresthill?

December is the coldest month in Foresthill, California, with an average high-temperature of 49.1°F (9.5°C) and an average low-temperature of 34.2°F (1.2°C).

What is the temperature in December in Foresthill?

In December, the average high-temperature is 49.1°F (9.5°C), and the average low-temperature is 34.2°F (1.2°C).

What is the average humidity in December in Foresthill?

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

How many days does it rain in December in Foresthill?

In Foresthill, California, in December, during 11 rainfall days, 5.59" (142mm) of precipitation is typically accumulated.

How many days does it snow in December in Foresthill?

In Foresthill, in December, during 3.9 snowfall days, 4.96" (126mm) of snow is typically accumulated.

What is the month with the shortest days in Foresthill?

With an average of 9.5h of daylight, December has the shortest days of the year.

How many hours of daylight does Foresthill have in December?

In Foresthill, the average length of the day in December is 9.5h.

How many hours of sunshine does Foresthill have in December?

In December, the average sunshine in Foresthill is 5.8h.

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

Months with the lowest UV index are February, November and December, with an average maximum UV index of 2.

What is the UV index intensity in December in Foresthill?

In Foresthill, California, the average daily maximum UV index in December is 2. A UV Index estimate of 2, and below, represents a minimal health vulnerability from unsafe exposure to the Sun's UV rays.

Average temperature in December
Foresthill, CA

Average temperature in December - Foresthill, CA
  • Average high temperature in December: 49.1°F

The warmest month (with the highest average high temperature) is July (87.6°F).
The month with the lowest average high temperature is December (49.1°F).

  • Average low temperature in December: 34.2°F

The month with the highest average low temperature is July (57.2°F).
The coldest month (with the lowest average low temperature) is December (34.2°F).

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Average pressure in December
Foresthill, CA

Average pressure in December - Foresthill, CA
  • Average pressure in December: 30.14"

The month with the highest atmospheric pressure is January (30.17").
The month with the lowest atmospheric pressure is June (29.9").

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Average wind speed in December
Foresthill, CA

Average wind speed in December - Foresthill, CA
  • Average wind speed in December: 5.3mph

The windiest month (with the highest average wind speed) is February (6mph).
The calmest month (with the lowest average wind speed) is August (4.8mph).

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Average humidity in December
Foresthill, CA

Average humidity in December - Foresthill, CA
  • Average humidity in December: 69%

The month with the highest relative humidity is March (77%).
The month with the lowest relative humidity is July (38%).

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Average rainfall in December
Foresthill, CA

Average rainfall in December - Foresthill, CA
  • Average rainfall in December: 5.59"

The wettest month (with the highest rainfall) is March (7.01").
The driest month (with the least rainfall) is July (0.04").

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Average rainfall days in December
Foresthill, CA

Average rainfall days in December - Foresthill, CA
  • Average rainfall days in December: 11 days

The month with the highest number of rainy days is March (13.9 days).
The month with the least rainy days is July (1.4 days).

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Average snowfall in December
Foresthill, CA

Average snowfall in December - Foresthill, CA
  • Average snowfall in December: 4.96"

The month with the highest snowfall is March (17.87").
Months with the least snowfall are June, July, August, September and October (0").

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Average snowfall days in December
Foresthill, CA

Average snowfall days in December - Foresthill, CA
  • Average snowfall days in December: 3.9 days

The month with the highest number of snowfall days is March (5.4 days).
Months with the least snowfall days are June, July, August, September and October (0 days).

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

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

The month with the longest days is June (Average daylight: 14.9h).
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 January (Average sunshine: 5.7h).

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Average sunshine days in December
Foresthill, CA

Average sunshine days in December - Foresthill, CA
  • Average sunshine days in December: 18.5 days

The month with the most sunshine days is July (28.4 days).
The month with the least sunshine days is March (13.5 days).

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Average UV index in December
Foresthill, CA

Average UV index in December - Foresthill, CA
  • Average UV index in December: 2

Months with the highest UV index are June, July and August (UV index 6).
Months with the lowest UV index are February, November and December (UV index 2).

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Average cloud cover in December
Foresthill, CA

Average cloud cover in December - Foresthill, CA
  • Average cloud cover in December: 35

The month with the most cloud cover is March (Cloud cover 43).
Months with the least cloud cover are July and August (Cloud cover 5).

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Average visibility in December
Foresthill, CA

Average visibility in December - Foresthill, 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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