Opal Cliffs
California, USA
Long-term weather forecast
Long-term weather forecast

December weather forecast and climate
Opal Cliffs, CA

Ocean temperature

In Opal Cliffs, California, in December, the average water temperature is 55.6°F (13.1°C).
Note: At temperatures below 50°F (10°C), swimming in a suitably protected swimsuit is feasible; otherwise, cold shock and loss of breathing control are imminent. Even a short swim, without thermal protection, at temperatures around 55.4°F (13°C) is not comfortable.

Daylight

December has the shortest days of the year, with an average of 9.7h of daylight.

What is the water temperature in December in Opal Cliffs?

In December, the average ocean temperature in Opal Cliffs, California, is 55.6°F (13.1°C). At temperatures below 50°F (10°C), swimming in a suitably protected swimsuit is feasible; otherwise, cold shock and loss of breathing control are imminent. Even a short swim, without thermal protection, at temperatures around 55.4°F (13°C) is not comfortable.

What is the month with the shortest days in Opal Cliffs?

The month with the shortest days is December, with an average of 9.7h of daylight.

What is the average length of the day in December in Opal Cliffs?

In Opal Cliffs, California, the average length of the day in December is 9.7h.
Average sea temperature in December - Opal Cliffs, CA
  • Average sea temperature in December: 55.6°F

Best months for swimming (with the highest average sea temperature) are August and September (58.1°F).
The coldest month (with the lowest average sea temperature) is April (53.8°F).

Average daylight in December - Opal Cliffs, CA
  • Average daylight in December: 9.7h

The month with the longest days is June (Average daylight: 14.7h).
The month with shortest days is December (Average daylight: 9.7h).