December weather forecast and climate
Martinez, CA

A cow grazing in the vast Martinez Hills
A cow grazing in the vast Martinez Hills' fields near Martinez Town, California

Weather in December

December, the first month of the winter, in Martinez, is still a mild month, with average temperature fluctuating between 55.4°F (13°C) and 42.3°F (5.7°C).

Temperature

The coldest month is December, with an average high-temperature of 55.4°F (13°C) and an average low-temperature of 42.3°F (5.7°C).

Humidity

The average relative humidity in December is 70%.

Rainfall

In Martinez, it is raining for 7.2 days, with typically 0.79" (20mm) of accumulated precipitation. Throughout the year, in Martinez, there are 48.9 rainfall days, and 4.96" (126mm) of precipitation is accumulated.

Daylight

With an average of 9.6h of daylight, December has the shortest days of the year in Martinez.

Sunshine

December has the least sunshine of the year in Martinez, with an average of 5.7h of sunshine.

UV index

Months with the lowest UV index are January, February, November and December, with an average maximum UV index of 3. A UV Index value of 3 to 5 symbolizes a moderate threat to health from unprotected exposure to the Sun's UV rays for the ordinary person.
Note: The average daily UV index of 3 transform into the following instructions:
Take precautions - Protection against sun damage is advised. The solar radiation is most powerful near the mid-day, so the exposure to the direct Sun should be reduced accordingly. 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.
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FAQ

What is the coldest month in Martinez?

With an average high-temperature of 55.4°F (13°C) and an average low-temperature of 42.3°F (5.7°C), December is the coldest month.

What is the temperature in December in Martinez?

The average high-temperature, in December, in Martinez, California, is 55.4°F (13°C), while the average low-temperature is 42.3°F (5.7°C).

What is the average humidity in December in Martinez?

In Martinez, California, the average relative humidity in December is 70%.

How many days does it rain in December in Martinez?

In Martinez, California, during December, the rain falls for 7.2 days and regularly aggregates up to 0.79" (20mm) of precipitation.

What is the month with the shortest days in Martinez?

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

How many hours of daylight does Martinez have in December?

In December, the average length of the day is 9.6h.

What is the month with the least sunshine in Martinez?

With an average of 5.7h of sunshine, December has the least sunshine of the year.

How long on average sun shines in December in Martinez?

In December, the average sunshine in Martinez, California, is 5.7h.

What is the month with the lowest UV index in Martinez?

Months with the lowest UV index in Martinez, California, are January, February, November and December, with an average maximum UV index of 3.

How high is the UV index in December in Martinez?

In December, the average daily maximum UV index is 3. A UV Index reading of 3 to 5 represents a medium hazard to health from the exposure to the Sun's UV rays.

Average temperature in December
Martinez, CA

Average temperature in December - Martinez, CA
  • Average high temperature in December: 55.4°F

The warmest month (with the highest average high temperature) is July (84.2°F).
The month with the lowest average high temperature is December (55.4°F).

  • Average low temperature in December: 42.3°F

The month with the highest average low temperature is September (57.6°F).
The coldest months (with the lowest average low temperature) are January and December (42.3°F).

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Average pressure in December
Martinez, CA

Average pressure in December - Martinez, CA
  • Average pressure in December: 30.11"

The month with the highest atmospheric pressure is January (30.14").
The month with the lowest atmospheric pressure is June (29.91").

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Average wind speed in December
Martinez, CA

Average wind speed in December - Martinez, CA
  • Average wind speed in December: 4.9mph

The windiest month (with the highest average wind speed) is May (7.4mph).
The calmest month (with the lowest average wind speed) is November (4.5mph).

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Average humidity in December
Martinez, CA

Average humidity in December - Martinez, CA
  • Average humidity in December: 70%

The month with the highest relative humidity is March (74%).
Months with the lowest relative humidity are September and October (56%).

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Average rainfall in December
Martinez, CA

Average rainfall in December - Martinez, CA
  • Average rainfall in December: 0.79"

The wettest month (with the highest rainfall) is February (0.98").
The driest months (with the least rainfall) are July and August (0.04").

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Average rainfall days in December
Martinez, CA

Average rainfall days in December - Martinez, CA
  • Average rainfall days in December: 7.2 days

The month with the highest number of rainy days is March (8.3 days).
The month with the least rainy days is August (1 days).

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Average daylight in December /
Average sunshine in December
Martinez, CA

Average daylight in December / Average sunshine in December - Martinez, CA
  • Average daylight in December: 9.6h

The month with the longest days is June (Average daylight: 14.8h).
The month with the shortest days is December (Average daylight: 9.6h).

  • Average sunshine in December: 5.7h

The month with the most sunshine is July (Average sunshine: 12h).
The month with the least sunshine is December (Average sunshine: 5.7h).

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Average sunshine days in December
Martinez, CA

Average sunshine days in December - Martinez, CA
  • Average sunshine days in December: 23.4 days

The month with the most sunshine days is July (29 days).
Months with the least sunshine days are February and March (22.1 days).

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Average UV index in December
Martinez, CA

Average UV index in December - Martinez, CA
  • Average UV index in December: 3

Months with the highest UV index are June, July and August (UV index 6).
Months with the lowest UV index are January, February, November and December (UV index 3).

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Average cloud cover in December
Martinez, CA

Average cloud cover in December - Martinez, CA
  • Average cloud cover in December: 36

Months with the most cloud cover are March and December (Cloud cover 36).
The month with the least cloud cover is July (Cloud cover 7).

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Average visibility in December
Martinez, CA

Average visibility in December - Martinez, CA
  • Average visibility in December: 6mi

Months with the highest visibility are January, February, March, April, May, June, July, August, September, October, November and December (6mi).
Months with the lowest visibility are January, February, March, April, May, June, July, August, September, October, November and December (6mi).

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