December weather forecast and climate
Merced, CA

Weather in December

The first month of the winter, December, is also a moderate month in Merced, California, with temperature in the range of an average high of 55.9°F (13.3°C) and an average low of 41.9°F (5.5°C).

Temperature

The coldest month is December, with an average high-temperature of 55.9°F (13.3°C) and an average low-temperature of 41.9°F (5.5°C).

Humidity

The average relative humidity is 68%.

Rainfall

In Merced, in December, during 8.7 rainfall days, 1.89" (48mm) of precipitation is typically accumulated. In Merced, during the entire year, the rain falls for 62.9 days and collects up to 11.69" (297mm) of precipitation.

Daylight

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

Sunshine

The month with the least sunshine in Merced is December, with an average of 6.1h of sunshine.

UV index

January, February, November and December, with an average maximum UV index of 3, are months with the lowest UV index in Merced. A UV Index reading of 3 to 5 represents a moderate health risk from unsafe exposure to the UV radiation for the ordinary person.
Note: The daily maximum UV index of 3 interpret into the following advice:
Take precautions - Protection against sun damage is advised. 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.
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FAQ

What is the coldest month in Merced?

December is the coldest month, with an average high-temperature of 55.9°F (13.3°C) and an average low-temperature of 41.9°F (5.5°C).

What is the temperature in December in Merced?

In December, in Merced, the average high-temperature is 55.9°F (13.3°C), and the average low-temperature is 41.9°F (5.5°C).

What is the average humidity in December in Merced?

In Merced, California, the average relative humidity in December is 68%.

How many days does it rain in December in Merced?

In Merced, California, in December, it is raining for 8.7 days, with typically 1.89" (48mm) of accumulated precipitation.

What is the month with the shortest days in Merced?

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

What is the average length of the day in December in Merced?

The average length of the day in December in Merced, California, is 9.6h.

What is the month with the least sunshine in Merced?

December has the least sunshine of the year in Merced, with an average of 6.1h of sunshine.

How many hours of sunshine does Merced have in December?

The average sunshine in December is 6.1h.

When is the lowest UV index in Merced?

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

How high is the UV index in December in Merced?

The average daily maximum UV index in December in Merced, California, is 3. A UV Index of 3 to 5 symbolizes a moderate health threat from unprotected exposure to the UV radiation.

Average temperature in December
Merced, CA

Average temperature in December - Merced, CA
  • Average high temperature in December: 55.9°F

The warmest month (with the highest average high temperature) is July (99.1°F).
The month with the lowest average high temperature is December (55.9°F).

  • Average low temperature in December: 41.9°F

The month with the highest average low temperature is July (65.5°F).
The coldest month (with the lowest average low temperature) is December (41.9°F).

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Average pressure in December
Merced, CA

Average pressure in December - Merced, CA
  • Average pressure in December: 30.12"

The month with the highest atmospheric pressure is January (30.15").
The month with the lowest atmospheric pressure is June (29.91").

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Average wind speed in December
Merced, CA

Average wind speed in December - Merced, CA
  • Average wind speed in December: 5.5mph

The windiest month (with the highest average wind speed) is June (8.3mph).
The calmest months (with the lowest average wind speed) are January and November (5.2mph).

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Average humidity in December
Merced, CA

Average humidity in December - Merced, CA
  • Average humidity in December: 68%

The month with the highest relative humidity is January (70%).
The month with the lowest relative humidity is July (32%).

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Average rainfall in December
Merced, CA

Average rainfall in December - Merced, CA
  • Average rainfall in December: 1.89"

The wettest month (with the highest rainfall) is March (2.44").
The driest month (with the least rainfall) is August (0.04").

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Average rainfall days in December
Merced, CA

Average rainfall days in December - Merced, CA
  • Average rainfall days in December: 8.7 days

The month with the highest number of rainy days is March (11.3 days).
The month with the least rainy days is June (1.1 days).

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

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

The month with the longest days is June (Average daylight: 14.7h).
The month with the shortest days is December (Average daylight: 9.6h).

  • Average sunshine in December: 6.1h

The month with the most sunshine is July (Average sunshine: 12.2h).
The month with the least sunshine is December (Average sunshine: 6.1h).

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Average sunshine days in December
Merced, CA

Average sunshine days in December - Merced, CA
  • Average sunshine days in December: 21.5 days

The month with the most sunshine days is August (28.8 days).
The month with the least sunshine days is March (18.8 days).

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Average UV index in December
Merced, CA

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

Months with the highest UV index are June, July and August (UV index 7).
Months with the lowest UV index are January, February, November and December (UV index 3).

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Average cloud cover in December
Merced, CA

Average cloud cover in December - Merced, CA
  • Average cloud cover in December: 31

The month with the most cloud cover is March (Cloud cover 32).
Months with the least cloud cover are July and August (Cloud cover 5).

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Average visibility in December
Merced, CA

Average visibility in December - Merced, 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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