December weather forecast
Shasta Lake, CA

Share

Weather in December

The first month of the winter, December, is also a frosty month in Shasta Lake, California, with an average temperature ranging between max 49.3°F (9.6°C) and min 35.2°F (1.8°C).

Temperature

In Shasta Lake, December is the month with the lowest recorded average temperatures, measuring a high of 49.3°F (9.6°C) and a low of 35.2°F (1.8°C).

Humidity

In Shasta Lake, California, the average relative humidity in December is 73%.

Rainfall

In Shasta Lake, in December, during 13.9 rainfall days, 4.69" (119mm) of precipitation is typically accumulated. In Shasta Lake, during the entire year, the rain falls for 99.5 days and collects up to 30.43" (773mm) of precipitation.

Snowfall

Months with snowfall are January through March, November and December. The month with the most snowfall is December, when snow falls for 0.8 days and typically aggregates up to 0.63" (16mm) of snow.

Daylight

December has the shortest days of the year, with an average of 9h and 18min of daylight.
On the first day of the month, sunrise is at 7:14 am and sunset at 4:42 pm. On the last day of December, in Shasta Lake, sunrise is at 7:33 am and sunset at 4:52 pm PST.

Sunshine

The month with the least sunshine in Shasta Lake is December, with an average of 5.5h of sunshine.

UV index

The months with the lowest UV index in Shasta Lake are February, November and December, with an average maximum UV index of 2. A UV Index estimate of 2, and below, represents a low health risk from exposure to the Sun's UV rays for the ordinary person.
Note: The maximum UV index of 2 during December leads to these instructions:
Despite most people tolerating extended sun exposure, it is critical to always protect those with sensitive skin, infants, and children. Midday is when the Sun's radiation is strongest; avoid prolonged exposure during this time. 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. Note well! The intensity of the Sun's UV rays can be nearly doubled by snow reflection.
Updated: Feb 10, 2024
Published by: Weather U.S. | About Us
Data Sources | Weather Forecasting & Climate

Frequently asked questions

What are the coldest months in Shasta Lake?

December tends to be the coldest month in Shasta Lake, with temperatures averaging a daily high of 49.3°F (9.6°C) and a low of 35.2°F (1.8°C).

What are the temperatures in Shasta Lake in December?

During December, Shasta Lake experiences an average high-temperature of 49.3°F (9.6°C) and a low-temperature of 35.2°F (1.8°C). The average heat index (a.k.a. 'apparent temperature', 'real feel'), which calculates the temperature value influenced by the moisture in the air, in June is calculated to be 84.2°F (29°C).

What is the average humidity in December in Shasta Lake?

The average relative humidity in December in Shasta Lake is 73%.

How many days does it rain in December in Shasta Lake?

In Shasta Lake, in December, it is raining for 13.9 days, with typically 4.69" (119mm) of accumulated precipitation.

What is the snowiest month in Shasta Lake?

The month with the most snowfall in Shasta Lake, California, is December, when snow falls for 0.8 days and typically aggregates up to 0.63" (16mm) of snow.

How many days does it snow in December in Shasta Lake?

In Shasta Lake, in December, snow falls for 0.8 days, with typically accumulated 0.63" (16mm) of snow.

What is the month with the shortest days in Shasta Lake?

With an average of 9h and 18min of daylight, December has the shortest days of the year in Shasta Lake.

What is the average length of the day in December in Shasta Lake?

In Shasta Lake, California, the average day length in December is 9h and 19min.

When is the sunrise / sunset in December in Shasta Lake?

On the first day of December in Shasta Lake, sunrise is at 7:14 am and sunset at 4:42 pm. On the last day of the month, sunrise is at 7:33 am and sunset at 4:52 pm PST.

What is the month with the least sunshine in Shasta Lake?

December has the least sunshine of the year in Shasta Lake, California, with an average of 5.5h of sunshine.

How long on average sun shines in December in Shasta Lake?

The average sunshine duration in December in Shasta Lake, California, is 5.5h.

What is the month with the lowest UV index in Shasta Lake?

The months with the lowest UV index in Shasta Lake, California, are February, November and December, with an average maximum UV index of 2.

What is the UV index intensity in December in Shasta Lake?

The average daily maximum UV index in December in Shasta Lake, California, is 2. A UV Index of 2, and less, symbolizes a minimal health vulnerability from unprotected exposure to UV radiation.
Average humidity
Average rainfall days
Average snowfall days
Average daylight
Average sunshine
Average sunshine days
Average UV index
Average cloud cover
Average visibility

Average temperature in December
Shasta Lake, CA

Average temperature in December - Shasta Lake, CA
  • Average high temperature in December: 49.3°F

The warmest month (with the highest average high temperature) is July (92.3°F).
The month with the lowest average high temperature is December (49.3°F).

  • Average low temperature in December: 35.2°F

The month with the highest average low temperature is July (61.3°F).
The coldest month (with the lowest average low temperature) is December (35.2°F).

Average pressure in December
Shasta Lake, CA

Average pressure in December - Shasta Lake, CA
  • Average pressure in December: 30.14"Hg

The month with the highest atmospheric pressure is January (30.16"Hg).
The months with the lowest atmospheric pressure are June and August (29.92"Hg).

Average wind speed in December
Shasta Lake, CA

Average wind speed in December - Shasta Lake, CA
  • Average wind speed in December: 4.5mph

The windiest months (with the highest average wind speed) are March, April, June and October (5.2mph).
The calmest months (with the lowest average wind speed) are August and November (4.4mph).

Average humidity in December
Shasta Lake, CA

Average humidity in December - Shasta Lake, CA
  • Average humidity in December: 73%

The month with the highest relative humidity is March (76%).
The month with the lowest relative humidity is August (35%).

Average rainfall in December
Shasta Lake, CA

Average rainfall in December - Shasta Lake, CA
  • Average rainfall in December: 4.69"

The wettest month (with the highest rainfall) is March (5.91").
The driest month (with the least rainfall) is July (0.08").

Average rainfall days in December
Shasta Lake, CA

Average rainfall days in December - Shasta Lake, CA
  • Average rainfall days in December: 13.9 days

The month with the highest number of rainy days is March (16.8 days).
The month with the least rainy days is August (1.6 days).

Average snowfall in December
Shasta Lake, CA

Average snowfall in December - Shasta Lake, CA
  • Average snowfall in December: 0.63"

The month with the highest snowfall is December (0.63").
The months with the least snowfall are April, May, June, July, August, September and October (0").

Average snowfall days in December
Shasta Lake, CA

Average snowfall days in December - Shasta Lake, CA
  • Average snowfall days in December: 0.8 days

The month with the highest number of snowfall days is February (1.1 days).
The months with the least snowfall days are April, May, June, July, August, September and October (0 days).

Average daylight in December /
Average sunshine in December
Shasta Lake, CA

Average daylight in December / Average sunshine in December - Shasta Lake, CA
  • Average daylight in December: 9h and 2min

The month with the longest days is June (Average daylight: 15h and 0min).
The month with the shortest days is December (Average daylight: 9h and 18min).

  • Average sunshine in December: 5h and 3min

The month with the most sunshine is July (Average sunshine: 12h and 12min).
The month with the least sunshine is December (Average sunshine: 5h and 30min).

Average sunshine days in December
Shasta Lake, CA

Average sunshine days in December - Shasta Lake, CA
  • Average sunshine days in December: 16 days

The month with the most sunshine days is August (27.3 days).
The month with the least sunshine days is March (12.7 days).

Average UV index in December
Shasta Lake, CA

Average UV index in December - Shasta Lake, CA
  • Average UV index in December: 2

The month with the highest UV index is July (UV index 7).
The months with the lowest UV index are February, November and December (UV index 2).

Average cloud cover in December
Shasta Lake, CA

Average cloud cover in December - Shasta Lake, CA
  • Average cloud cover in December: 40

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

Average visibility in December
Shasta Lake, CA

Average visibility in December - Shasta Lake, 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).

Shasta Lake, California, USA

Weather forecast for your location

1. Click Locate me button
2. Allow the app to use your location