Santa Cruz
California, USA
Long-term weather forecast
Long-term weather forecast

December weather forecast and climate
Santa Cruz, CA

A high aerial view of the bay area in Santa Cruz, California, view of the beach sand, numerous parked cars, scenic trees, and residential homes
A high aerial view of the bay area in Santa Cruz, California, view of the beach sand, numerous parked cars, scenic trees, and residential homes
December, the first month of the winter, in Santa Cruz, is also a moderate month, with average temperature fluctuating between 60.1°F (15.6°C) and 40.8°F (4.9°C).

Temperature

With an average high-temperature of 60.1°F (15.6°C) and an average low-temperature of 40.8°F (4.9°C), December is the coldest month.

Rainfall

In Santa Cruz, California, during December, the rain falls for 10.7 days and regularly aggregates up to 5.7" (144.3mm) of precipitation. In Santa Cruz, during the entire year, the rain falls for 66.2 days and collects up to 31.5" (801mm) of precipitation.

Ocean temperature

In Santa Cruz, California, the average water temperature is 55.6°F (13.1°C). Swimming in 55.6°F (13.1°C) is considered dangerous. Unprotected immersion in temperatures below 50°F (10°C) causes quickly maximum intensity cold shock with hyperventilation.

Daylight

With an average of 9.7h of daylight, December has the shortest days of the year in Santa Cruz.

Sunshine

With an average of 5h of sunshine, December has the least sunshine of the year in Santa Cruz.

UV index

January and December, with an average maximum UV index of 2, are months with the lowest UV index in Santa Cruz. A UV Index value of 2, and less, symbolizes a minimal health vulnerability from unsafe exposure to the UV radiation for ordinary individuals.
The average daily UV index of 2 in December transform into the following instructions:
Extended sun exposure is not an issue for the majority. Children, infants, and fair-skinned individuals always need to be protected. The Sun's most intense and consequently most harmful UV radiation during midday hours should be decreased by minimizing exposure and seeking shade. On bright days sunglasses that block both UVA and UVB rays should be worn. A hat with a wide brim is extremely helpful, as it can prevent roughly 50% of UV radiation from reaching the eyes.

What is the coldest month in Santa Cruz?

December is the coldest month, with an average high-temperature of 60.1°F (15.6°C) and an average low-temperature of 40.8°F (4.9°C).

What is the temperature in December in Santa Cruz?

The average high-temperature, in December, in Santa Cruz, California, is 60.1°F (15.6°C), while the average low-temperature is 40.8°F (4.9°C).

How much does it rain in Santa Cruz in December?

In Santa Cruz, California, during December, the rain falls for 10.7 days and regularly aggregates up to 5.7" (144.3mm) of precipitation.

What is the ocean temperature in December in Santa Cruz?

In December, the average ocean temperature in Santa Cruz 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 Santa Cruz?

With an average of 9.7h of daylight, December has the shortest days of the year in Santa Cruz.

What is the average length of the day in December in Santa Cruz?

In Santa Cruz, California, the average length of the day in December is 9.7h.

What is the month with the least sunshine in Santa Cruz?

December has the least sunshine of the year in Santa Cruz, California, with an average of 5h of sunshine.

How long on average sun shines in December in Santa Cruz?

In Santa Cruz, the average sunshine in December is 5h.

What is the month with the lowest UV index in Santa Cruz?

January and December, with an average maximum UV index of 2, are months with the lowest UV index.

What is the UV index intensity in December in Santa Cruz?

In December, the average daily maximum UV index in Santa Cruz, California, is 2. A UV Index of 2, and less, symbolizes a low health risk from the exposure to the Sun's UV rays.
Average temperature in December - Santa Cruz, CA
  • Average high temperature in December: 60°F

The warmest month (with the highest average high temperature) is September (74.5°F).
The month with the lowest average high temperature is December (60°F).

  • Average low temperature in December: 40.8°F

The month with the highest average low temperature is August (53.9°F).
Coldest months (with the lowest average low temperature) are January and December (40.8°F).

Average rainfall in December - Santa Cruz, CA
  • Average rainfall in December: 5.7"

The wettest month (with the highest rainfall) is January (6.4").
Driest months (with the lowest rainfall) are July and August (0").

Average rainfall days in December - Santa Cruz, CA
  • Average rainfall days in December: 10.7 days

The month with the highest number of rainy days is February (10.9 days).
The month with the lowest number of rainy days is July (0.3 days).

Average sea temperature in December - Santa Cruz, CA
  • Average sea temperature in December: 55.5°F

The best month for swimming (with the highest average sea temperature) is September (58.2°F).
The coldest month (with the lowest average sea temperature) is April (53.9°F).

Average daylight in December / Average sunshine in December - Santa Cruz, 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).

  • Average sunshine in December: 5h

Months with most sunshine are May, June and July (Average sunshine: 11h).
The month with least sunshine is December (Average sunshine: 5h).

Average UV index in December - Santa Cruz, CA
  • Average UV index in December: 2

Months with the highest UV index are June, July and August (UV index 9).
Months with the lowest UV index are January and December (UV index 2).