Mount Hamilton
California, USA
Long-term weather forecast
Long-term weather forecast

December weather forecast and climate
Mount Hamilton, CA

The first month of the winter, December, is also a frosty month in Mount Hamilton, California, with average temperature ranging between min 37°F (2.8°C) and max 48.9°F (9.4°C).

Temperature

In December, the average high-temperature slightly decreases, from a fresh 54.9°F (12.7°C) in November, to a chilly 48.9°F (9.4°C). The average low-temperature, in December, is 37°F (2.8°C).

Rainfall

Throughout December, 4" (102.6mm) of precipitation is accumulated. Throughout the year, in Mount Hamilton, 23.6" (600.2mm) of rain is accumulated.

Snowfall

January through April, November and December are months with snowfall. During December, Mount Hamilton regularly aggregates up to 2.3" (58.4mm) of snow. Throughout the year, 17.7" (449.6mm) of snow is accumulated.

Daylight

December has the shortest days of the year, with an average of 9.6h of daylight.

What is the temperature in December in Mount Hamilton?

In Mount Hamilton, California, in December, the average high-temperature is 48.9°F (9.4°C), and the average low-temperature is 37°F (2.8°C).

How much does it rain in Mount Hamilton in December?

In Mount Hamilton, California, in December, 4" (102.6mm) of precipitation is typically accumulated.

How much does it snow in Mount Hamilton in December?

In Mount Hamilton, in December, 2.3" (58.4mm) of snow is typically accumulated.

What is the month with the shortest days in Mount Hamilton?

December has the shortest days of the year, with an average of 9.6h of daylight.

How many hours of daylight does Mount Hamilton have in December?

In Mount Hamilton, the average length of the day in December is 9.6h.
Average temperature in December - Mount Hamilton, CA
  • Average high temperature in December: 49°F

The warmest month (with the highest average high temperature) is July (78.7°F).
The month with the lowest average high temperature is January (48.5°F).

  • Average low temperature in December: 37.1°F

The month with the highest average low temperature is July (63.3°F).
Coldest months (with the lowest average low temperature) are February and March (36.7°F).

Average rainfall in December - Mount Hamilton, CA
  • Average rainfall in December: 4"

The wettest month (with the highest rainfall) is January (4.4").
The driest month (with the lowest rainfall) is July (0").

Average snowfall in December - Mount Hamilton, CA
  • Average snowfall in December: 2.3"

The month with the highest snowfall is January (5").
Months with the lowest snowfall are May, June, July, August, September and October (0").

Average daylight in December - Mount Hamilton, CA
  • Average daylight in December: 9.6h

The month with the longest days is June (Average daylight: 14.7h).
The month with shortest days is December (Average daylight: 9.6h).