Half Moon Bay
California, USA
Long-term weather forecast
Long-term weather forecast

December weather forecast and climate
Half Moon Bay, CA

A warm and sunny day on a scenic beach in Half Moon Bay, California
A warm and sunny day on a scenic beach in Half Moon Bay, California
December, the first month of the winter, in Half Moon Bay, is still a mild month, with average temperature ranging between min 43.3°F (6.3°C) and max 58.8°F (14.9°C).

Temperature

In December, the average high-temperature is almost the same as in November - a moderate 58.8°F (14.9°C). In December, in Half Moon Bay, the average low-temperature is 43.3°F (6.3°C).

Rainfall

In Half Moon Bay, during 11 rainfall days, 4.5" (114.8mm) of precipitation is typically accumulated. Throughout the year, there are 87 rainfall days, and 26.2" (664.6mm) of precipitation is accumulated.

Daylight

The month with the shortest days is December, with an average of 9.6h of daylight.

What is the temperature in December in Half Moon Bay?

In December, in Half Moon Bay, California, the average high-temperature is 58.8°F (14.9°C), and the average low-temperature is 43.3°F (6.3°C).

How much does it rain in Half Moon Bay in December?

In Half Moon Bay, California, in December, it is raining for 11 days, with typically 4.5" (114.8mm) of accumulated precipitation.

What is the month with the shortest days in Half Moon Bay?

December has the shortest days of the year in Half Moon Bay, with an average of 9.6h of daylight.

What is the average length of the day in December in Half Moon Bay?

In December, the average length of the day in Half Moon Bay is 9.6h.
Average temperature in December - Half Moon Bay, CA
  • Average high temperature in December: 58.9°F

The warmest month (with the highest average high temperature) is September (66.8°F).
The month with the lowest average high temperature is January (58.4°F).

  • Average low temperature in December: 43.3°F

The month with the highest average low temperature is August (52.7°F).
The coldest month (with the lowest average low temperature) is January (42.9°F).

Average rainfall in December - Half Moon Bay, CA
  • Average rainfall in December: 4.5"

The wettest month (with the highest rainfall) is January (5.2").
The driest month (with the lowest rainfall) is July (0.1").

Average rainfall days in December - Half Moon Bay, CA
  • Average rainfall days in December: 11 days

The month with the highest number of rainy days is January (12 days).
The month with the lowest number of rainy days is June (3 days).

Average daylight in December - Half Moon Bay, 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).