Sacramento
California, USA
Long-term weather forecast
Long-term weather forecast

December weather forecast and climate
Sacramento, CA

The State Capitol Building in Sacramento, California, under the perfect blue sky
The State Capitol Building in Sacramento, California, under the perfect blue sky
The first month of the winter, December, is still a cool month in Sacramento, California, with average temperature varying between 54°F (12.2°C) and 38.5°F (3.6°C).

Temperature

In December, the average high-temperature drops, from an enjoyable 63.9°F (17.7°C) in November, to a fresh 54°F (12.2°C). In Sacramento, the average low-temperature is 38.5°F (3.6°C).

Humidity

In December, the average relative humidity in Sacramento is 82.9%.

Rainfall

In December, in Sacramento, the rain falls for 9.9 days. Throughout December, 3.3" (82.6mm) of precipitation is accumulated. In Sacramento, California, during the entire year, the rain falls for 60.1 days and collects up to 18.5" (470.5mm) of precipitation.

Daylight

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

Sunshine

December has the least sunshine of the year in Sacramento, with an average of 4.6h of sunshine.

UV index

Months with the lowest UV index in Sacramento are January and December, with an average maximum UV index of 2. A UV Index value of 2, and less, symbolizes a minimal health vulnerability from unprotected exposure to the Sun's UV rays for the ordinary person.
Note: In December, the average maximum UV index of 2 translate into the following recommendations:
Extended sun exposure is not an issue for the majority. Children, infants, and fair-skinned individuals always need to be protected. The Sun's most intense and consequently most harmful UV radiation during midday hours should be decreased by minimizing exposure and seeking shade. 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.

What is the temperature in December in Sacramento?

In Sacramento, California, in December, the average high-temperature is 54°F (12.2°C), and the average low-temperature is 38.5°F (3.6°C).

What is the average humidity in December in Sacramento?

The average relative humidity in December in Sacramento is 82.9%.

How many days does it rain in December in Sacramento?

In Sacramento, during December, the rain falls for 9.9 days and regularly aggregates up to 3.3" (82.6mm) of precipitation.

What is the month with the shortest days in Sacramento?

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

What is the average length of the day in December in Sacramento?

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

What is the month with the least sunshine in Sacramento?

The month with the least sunshine is December, with an average of 4.6h of sunshine.

How many hours of sunshine does Sacramento have in December?

In Sacramento, the average sunshine in December is 4.6h.

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

January and December, with an average maximum UV index of 2, are months with the lowest UV index in Sacramento.

What is the UV index intensity in December in Sacramento?

The average daily maximum UV index in December is 2. A UV Index of 2, and less, symbolizes a minimal hazard to health from unsafe exposure to the Sun's UV rays.
Average temperature in December - Sacramento, CA
  • Average high temperature in December: 12.2°C

The warmest month (with the highest average high temperature) is July (33.4°C).
The month with the lowest average high temperature is January (12.1°C).

  • Average low temperature in December: 3.6°C

The month with the highest average low temperature is July (14.7°C).
The coldest month (with the lowest average low temperature) is December (3.6°C).

Average humidity in December - Sacramento, CA
  • Average humidity in December: 82.9%

The month with the highest relative humidity is January (83.3%).
The month with the lowest relative humidity is July (53.2%).

Average rainfall in December - Sacramento, CA
  • Average rainfall in December: 82.6mm

The wettest month (with the highest rainfall) is January (92.5mm).
The driest month (with the lowest rainfall) is July (0mm).

Average rainfall days in December - Sacramento, CA
  • Average rainfall days in December: 9.9 days

The month with the highest number of rainy days is January (10.3 days).
The month with the lowest number of rainy days is July (0 days).

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

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

  • Average sunshine in December: 4.6h

The month with most sunshine is July (Average sunshine: 14.2h).
The month with least sunshine is December (Average sunshine: 4.6h).

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

Months with the highest UV index are June and July (UV index 9).
Months with the lowest UV index are January and December (UV index 2).