December weather forecast and climate
Graton, CA

Average temperature in December - Graton, CA
  • Average high temperature in December: 56.9°F

The warmest month (with the highest average high temperature) is August (83.5°F).
The month with the lowest average high temperature is January (56.2°F).

  • Average low temperature in December: 36.2°F

The month with the highest average low temperature is July (48.5°F).
The coldest month (with the lowest average low temperature) is January (35.9°F).

Average rainfall in December - Graton, CA
  • Average rainfall in December: 7.9"

The wettest month (with the highest rainfall) is January (8.7").
The driest month (with the lowest rainfall) is July (0").

Average rainfall days in December - Graton, CA
  • Average rainfall days in December: 12 days

The month with the highest number of rainy days is January (13 days).
The month with the lowest number of rainy days is July (0 days).

Average daylight in December - Graton, 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).

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