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

December weather forecast and climate
Simi Valley, CA

An aerial shot of the deep design and plan of the Simi Valley city in California, with a view of the scenic Rocky Peak and hilly ranges and a clear sky
An aerial shot of the deep design and plan of the Simi Valley city in California, with a view of the scenic Rocky Peak and hilly ranges and a clear sky
The first month of the winter, December, is still a pleasant month in Simi Valley, California, with temperature in the range of an average low of 37.9°F (3.3°C) and an average high of 68°F (20°C).

Temperature

The coldest month is December, with an average high-temperature of 68°F (20°C) and an average low-temperature of 37.9°F (3.3°C).

Rainfall

Throughout December, 2.8" (70.1mm) of precipitation is accumulated. Throughout the year, in Simi Valley, 17.9" (455.4mm) of rain is accumulated.

Daylight

December has the shortest days of the year, with an average of 9.9h of daylight.

What is the coldest month in Simi Valley?

December is the coldest month, with an average high-temperature of 68°F (20°C) and an average low-temperature of 37.9°F (3.3°C).

What is the temperature in December in Simi Valley?

In December, in Simi Valley, California, the average high-temperature is 68°F (20°C), and the average low-temperature is 37.9°F (3.3°C).

How much does it rain in Simi Valley in December?

During December, Simi Valley regularly aggregates up to 2.8" (70.1mm) of precipitation.

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

December has the shortest days of the year in Simi Valley, with an average of 9.9h of daylight.

How many hours of daylight does Simi Valley have in December?

In December, the average length of the day in Simi Valley is 9.9h.
Average temperature in December - Simi Valley, CA
  • Average high temperature in December: 68°F

The warmest month (with the highest average high temperature) is August (97°F).
The month with the lowest average high temperature is December (68°F).

  • Average low temperature in December: 38°F

Months with the highest average low temperature are July and August (57°F).
The coldest month (with the lowest average low temperature) is December (38°F).

Average rainfall in December - Simi Valley, CA
  • Average rainfall in December: 2.8"

The wettest month (with the highest rainfall) is February (4.8").
The driest month (with the lowest rainfall) is July (0").

Average daylight in December - Simi Valley, CA
  • Average daylight in December: 9.9h

The month with the longest days is June (Average daylight: 14.4h).
The month with shortest days is December (Average daylight: 9.9h).