December weather forecast
San Martin, CA

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Weather in December

The first month of the winter, December, is also a moderate month in San Martin, California, with an average temperature varying between 40.1°F (4.5°C) and 55.8°F (13.2°C).

Temperature

December is the month when San Martin experiences its coldest temperatures, averaging a high of 55.8°F (13.2°C) and a low of 40.1°F (4.5°C).

Humidity

The average relative humidity in December in San Martin is 72%.

Rainfall

The month with the most rainfall in San Martin is December, when the rain falls for 9.7 days and typically aggregates up to 1.97" (50mm) of precipitation.

Daylight

The month with the shortest days in San Martin is December, with an average of 9h and 42min of daylight.
On the first day of the month, sunrise is at 7:01 am and sunset at 4:49 pm. On the last day of December, sunrise is at 7:19 am and sunset at 4:59 pm PST.

Sunshine

With an average of 6h of sunshine, December has the least sunshine of the year in San Martin.

UV index

The months with the lowest UV index are January, February, November and December, with an average maximum UV index of 3. A UV Index of 3 to 5 symbolizes a moderate health risk from exposure to the Sun's UV rays for the ordinary person.
Note: The maximum daily UV index of 3 in December converts into the following recommendations:
Take precautions - Protection against skin and eye damage is obliged. Sun exposure should be minimized, especially during midday, to avoid harmful UV radiation. Sunglasses providing both UVA and UVB protection are non-negotiable on sunlit days.
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Frequently asked questions

What time of the year is the coldest in San Martin?

December is the coldest month of the year in San Martin, registering average temperatures as high as 55.8°F (13.2°C) and as low as 40.1°F (4.5°C).

What is the temperature in December in San Martin?

December temperatures vary between a high-temperature of 55.8°F (13.2°C) and a low-temperature of 40.1°F (4.5°C). In September, the average heat index (a.k.a. 'real feel', 'apparent temperature'), which calculates the temperature value influenced by the moisture in the air, is appraised at 86°F (30°C).

What is the average humidity in December in San Martin?

In San Martin, the average relative humidity in December is 72%.

What is the wettest month in San Martin?

December is the month with the most rainfall in San Martin, California. Rain falls for 9.7 days and accumulates 1.97" (50mm) of precipitation.

How much does it rain in San Martin in December?

In San Martin, California, in December, during 9.7 rainfall days, 1.97" (50mm) of precipitation is typically accumulated.

What is the month with the shortest days in San Martin?

The month with the shortest days is December, with an average of 9h and 42min of daylight.

How many hours of daylight does San Martin have in December?

The average day length in December in San Martin, California, is 9h and 40min.

What time are sunrise and sunset in December in San Martin?

On the first day of December in San Martin, sunrise is at 7:01 am and sunset at 4:49 pm. On the last day of the month, sunrise is at 7:19 am and sunset at 4:59 pm PST.

What is the month with the least sunshine in San Martin?

The month with the least sunshine in San Martin, California, is December, with an average of 6h of sunshine.

How many hours of sunshine does San Martin have in December?

In December, the average sunshine duration in San Martin, California, is 6h.

What is the month with the lowest UV index in San Martin?

The months with the lowest UV index in San Martin are January, February, November and December, with an average maximum UV index of 3.

What is the UV index intensity in December in San Martin?

The average daily maximum UV index in December is 3. A UV Index of 3 to 5 symbolizes a medium hazard to health from unprotected exposure to UV radiation.
Average humidity
Average rainfall days
Average daylight
Average sunshine
Average sunshine days
Average UV index
Average cloud cover
Average visibility

Average temperature in December
San Martin, CA

Average temperature in December - San Martin, CA
  • Average high temperature in December: 55.8°F

The warmest month (with the highest average high temperature) is July (86.5°F).
The month with the lowest average high temperature is December (55.8°F).

  • Average low temperature in December: 40.1°F

The month with the highest average low temperature is August (55°F).
The coldest month (with the lowest average low temperature) is December (40.1°F).

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Average pressure in December
San Martin, CA

Average pressure in December - San Martin, CA
  • Average pressure in December: 30.11"Hg

The month with the highest atmospheric pressure is January (30.14"Hg).
The months with the lowest atmospheric pressure are June, August and September (29.92"Hg).

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Average wind speed in December
San Martin, CA

Average wind speed in December - San Martin, CA
  • Average wind speed in December: 4.1mph

The windiest month (with the highest average wind speed) is May (5.4mph).
The calmest month (with the lowest average wind speed) is November (3.9mph).

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Average humidity in December
San Martin, CA

Average humidity in December - San Martin, CA
  • Average humidity in December: 72%

The month with the highest relative humidity is March (74%).
The months with the lowest relative humidity are July and September (55%).

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Average rainfall in December
San Martin, CA

Average rainfall in December - San Martin, CA
  • Average rainfall in December: 1.97"

The wettest month (with the highest rainfall) is December (1.97").
The driest months (with the least rainfall) are June, July and August (0.08").

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Average rainfall days in December
San Martin, CA

Average rainfall days in December - San Martin, CA
  • Average rainfall days in December: 9.7 days

The month with the highest number of rainy days is March (12.4 days).
The month with the least rainy days is August (1 days).

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Average daylight in December /
Average sunshine in December
San Martin, CA

Average daylight in December / Average sunshine in December - San Martin, CA
  • Average daylight in December: 9h and 4min

The month with the longest days is June (Average daylight: 14h and 42min).
The month with the shortest days is December (Average daylight: 9h and 42min).

  • Average sunshine in December: 6h and 0min

The month with the most sunshine is July (Average sunshine: 12h and 6min).
The month with the least sunshine is December (Average sunshine: 6h and 0min).

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Average sunshine days in December
San Martin, CA

Average sunshine days in December - San Martin, CA
  • Average sunshine days in December: 20.5 days

The month with the most sunshine days is August (28.7 days).
The month with the least sunshine days is March (16.8 days).

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Average UV index in December
San Martin, CA

Average UV index in December - San Martin, CA
  • Average UV index in December: 3

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

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Average cloud cover in December
San Martin, CA

Average cloud cover in December - San Martin, CA
  • Average cloud cover in December: 34

The month with the most cloud cover is March (Cloud cover 37).
The month with the least cloud cover is July (Cloud cover 5).

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Average visibility in December
San Martin, CA

Average visibility in December - San Martin, CA
  • Average visibility in December: 6mi

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

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San Martin, California, USA

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