Grass Valley
California, USA
Long-term weather forecast
Long-term weather forecast

December weather forecast and climate
Grass Valley, CA

December, the first month of the winter, in Grass Valley, is still a cool month, with average temperature ranging between max 53.1°F (11.7°C) and min 31.6°F (-0.2°C).

Temperature

December is the coldest month, with an average high-temperature of 53.1°F (11.7°C) and an average low-temperature of 31.6°F (-0.2°C).

Rainfall

In Grass Valley, California, it is raining for 12.6 days, with typically 9.5" (240.3mm) of accumulated precipitation. In Grass Valley, during the entire year, the rain falls for 84.6 days and collects up to 53.2" (1352.4mm) of precipitation.

Snowfall

Months with snowfall in Grass Valley are January through April, November and December. In December, it is snowing for 0.6 days. Throughout December, 1.9" (48.3mm) of snow is accumulated. Throughout the year, in Grass Valley, California, there are 3.4 snowfall days, and 10.1" (256.6mm) of snow is accumulated.

Daylight

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

What is the coldest month in Grass Valley?

The coldest month is December, with an average high-temperature of 53.1°F (11.7°C) and an average low-temperature of 31.6°F (-0.2°C).

What is the temperature in December in Grass Valley?

The average high-temperature, in December, in Grass Valley, California, is 53.1°F (11.7°C), while the average low-temperature is 31.6°F (-0.2°C).

How many days does it rain in December in Grass Valley?

In Grass Valley, in December, during 12.6 rainfall days, 9.5" (240.3mm) of precipitation is typically accumulated.

How many days does it snow in December in Grass Valley?

In Grass Valley, in December, during 0.6 snowfall days, 1.9" (48.3mm) of snow is typically accumulated.

What is the month with the shortest days in Grass Valley?

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

What is the average length of the day in December in Grass Valley?

In December, the average length of the day in Grass Valley, California, is 9.5h.
Average temperature in December - Grass Valley, CA
  • Average high temperature in December: 53.1°F

The warmest month (with the highest average high temperature) is July (87.4°F).
The month with the lowest average high temperature is December (53.1°F).

  • Average low temperature in December: 31.7°F

The month with the highest average low temperature is July (56.2°F).
The coldest month (with the lowest average low temperature) is December (31.7°F).

Average rainfall in December - Grass Valley, CA
  • Average rainfall in December: 9.5"

The wettest month (with the highest rainfall) is January (9.7").
The driest month (with the lowest rainfall) is July (0.1").

Average rainfall days in December - Grass Valley, CA
  • Average rainfall days in December: 12.6 days

The month with the highest number of rainy days is January (13.1 days).
The month with the lowest number of rainy days is July (0.2 days).

Average snowfall in December - Grass Valley, CA
  • Average snowfall in December: 1.9"

The month with the highest snowfall is February (2.5").
Months with the lowest snowfall are May, June, July, August, September and October (0").

Average snowfall days in December - Grass Valley, CA
  • Average snowfall days in December: 0.6 days

The month with the highest number of snowfall days is March (1.1 days).
Months with the lowest number of snowfall days are May, June, July, August, September and October (0 days).

Average daylight in December - Grass Valley, CA
  • Average daylight in December: 9.5h

The month with the longest days is June (Average daylight: 14.9h).
The month with shortest days is December (Average daylight: 9.5h).