Weather in Half Moon Bay, United States in December

So you're interested in going to Half Moon Bay, United States in December

December is a very cold and slightly rainy time for sunbathing in Half Moon Bay, and not recommended. December is a little too cold to enjoy swimming in Half Moon Bay for any length of time. Consider visiting Half Moon Bay in the months of June, July, August, September, for the best beach weather. Also consider one of our other suggestions for December.

Temperature in Half Moon Bay in December

The average maximum temperature in Half Moon Bay in December is 14°. The average maximum temperature is 17° in the previous month and 15° in the next month.

The average temperature in Half Moon Bay in December is 10°. The average temperature ranges is 12° in the previous month and 10° in the next month.

The average minimum temperature in Half Moon Bay in December is . The minimum temperature is in the previous month and in the next month.

Sunshine in Half Moon Bay in December

The average day light hours per day in Half Moon Bay in December are 9.6 and there are 5.2 hours of sunshine per day on average during December making it a sunny month that is overcast at times.

The ultraviolet index in Half Moon Bay in December is typically 2.3 during December. An ultraviolet index reading of 0 to 2 indicates low danger from the sun's UV rays for the average person. Most people will be able to spend several hours in the sun with out a problem, however unprotected skin risks burning in less than 1 hour. Wear sunglasses on bright days. Only those that burn easily will need to apply sunscreen. Watch out for relections from water that may increase ultraviolet exposure.

Sea Temperature in Half Moon Bay in December

The average sea water temperature in Half Moon Bay in December is 17.9° which is cool for swimming, shorty wetsuit may help you extend your time in the water.

Rainfall in Half Moon Bay in December

The average total rainfall in Half Moon Bay in December is 7.2cm and on average there are 13.6 rainy days in December making it a slightly wet time to visit the beach.

Humidity in Half Moon Bay in December

The maximum dew point (an indicator of humidity) in Half Moon Bay in December is which is a bit dry for some. The dew point is 12° in the previous month and in the next month.

The average maximum relative humidity in Half Moon Bay in December is typically 93.6%. The maximum relative humidity is 96.6% in the previous month and 93.3% in the next month.

The average relative humidity in Half Moon Bay in December is typically 78%. The average relative humidity is 81.4% in the previous month and 76.6% in the next month.

Wind Speed in Half Moon Bay in December

The average maximum wind speed in Half Moon Bay in December is typically 27kmh. The average maximum wind speed is 25kmh in the previous month and 26kmh in the next month.

The average wind speed in Half Moon Bay in December is typically 11kmh. The average wind speed is 9kmh in the previous month and 9kmh in the next month.

The average wind direction in Half Moon Bay in December is from the North.

Monthly Averages

Suggested Beaches in December

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