December weather forecast
Monte Rio, CA

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Weather in December

December, the first month of the winter in Monte Rio, is still a refreshing month, with an average temperature varying between 41.4°F (5.2°C) and 56.3°F (13.5°C).

Temperature

December, with an average high of 56.3°F (13.5°C) and a low of 41.4°F (5.2°C), signifies the coldest month of the year.

Humidity

The average relative humidity in December is 76%.

Rainfall

In Monte Rio, in December, it is raining for 8.6 days, with typically 2.32" (59mm) of accumulated precipitation. Throughout the year, in Monte Rio, there are 60.1 rainfall days, and 12.87" (327mm) of precipitation is accumulated.

Daylight

December has the shortest days of the year in Monte Rio, California, with an average of 9h and 30min of daylight.
On the first day of the month, sunrise is at 7:11 am and sunset at 4:51 pm. On the last day of December, sunrise is at 7:29 am and sunset at 5:01 pm PST.

Sunshine

With an average of 5.4h of sunshine, December has the least sunshine of the year in Monte Rio.

UV index

The months with the lowest UV index in Monte Rio 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 radiation for ordinary individuals.
Note: In December, a regular UV index of 3 translates into these guidelines:
Guard yourself - Avoiding sunburn is suggested. It's recommended to limit sun exposure when its radiation is at its peak during midday. Your best bet for sun defense on the face, eyes, and neck is a hat with a wide brim.
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Frequently asked questions

What time of the year is the coldest in Monte Rio?

December is the coldest month of the year in Monte Rio, California, registering average temperatures as high as 56.3°F (13.5°C) and as low as 41.4°F (5.2°C).

What is the temperature in December in Monte Rio?

An average high-temperature, in December, in Monte Rio, is 56.3°F (13.5°C) and the average low-temperature is 41.4°F (5.2°C). In August, the average heat index (a.k.a. 'real feel', 'felt air temperature'), which calculates the temperature value influenced by the moisture in the air, is calculated to be 84.2°F (29°C).

What is the average humidity in December in Monte Rio?

In December, the average relative humidity in Monte Rio, California, is 76%.

How much does it rain in Monte Rio in December?

In December, in Monte Rio, California, the rain falls for 8.6 days. Throughout December, 2.32" (59mm) of precipitation is accumulated.

What is the month with the shortest days in Monte Rio?

December has the shortest days of the year in Monte Rio, California, with an average of 9h and 30min of daylight.

What is the average length of the day in December in Monte Rio?

The average day length in December in Monte Rio, California, is 9h and 32min.

What time are sunrise and sunset in December in Monte Rio?

On the first day of December, sunrise is at 7:11 am and sunset at 4:51 pm. On the last day of the month, sunrise is at 7:29 am and sunset at 5:01 pm PST.

What is the month with the least sunshine in Monte Rio?

December has the least sunshine of the year, with an average of 5.4h of sunshine.

How long on average sun shines in December in Monte Rio?

In December, the average sunshine duration in Monte Rio is 5.4h.

What are the months with the lowest UV index in Monte Rio?

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

What is the UV index reading in December in Monte Rio?

In December, the average daily maximum UV index in Monte Rio, California, is 3. A UV Index value of 3 to 5 symbolizes a medium health risk from exposure to the Sun's 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
Monte Rio, CA

Average temperature in December - Monte Rio, CA
  • Average high temperature in December: 56.3°F

The warmest month (with the highest average high temperature) is August (81°F).
The month with the lowest average high temperature is December (56.3°F).

  • Average low temperature in December: 41.4°F

The months with the highest average low temperature are August and September (53.4°F).
The coldest month (with the lowest average low temperature) is December (41.4°F).

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Average pressure in December
Monte Rio, CA

Average pressure in December - Monte Rio, CA
  • Average pressure in December: 30.1"Hg

The month with the highest atmospheric pressure is January (30.13"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
Monte Rio, CA

Average wind speed in December - Monte Rio, CA
  • Average wind speed in December: 5.2mph

The windiest month (with the highest average wind speed) is May (7.2mph).
The calmest month (with the lowest average wind speed) is November (5mph).

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Average humidity in December
Monte Rio, CA

Average humidity in December - Monte Rio, CA
  • Average humidity in December: 76%

The month with the highest relative humidity is March (77%).
The month with the lowest relative humidity is September (62%).

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Average rainfall in December
Monte Rio, CA

Average rainfall in December - Monte Rio, CA
  • Average rainfall in December: 2.32"

The wettest month (with the highest rainfall) is February (3.27").
The driest months (with the least rainfall) are July and August (0.04").

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Average rainfall days in December
Monte Rio, CA

Average rainfall days in December - Monte Rio, CA
  • Average rainfall days in December: 8.6 days

The month with the highest number of rainy days is March (10.3 days).
The month with the least rainy days is August (0.9 days).

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Average daylight in December /
Average sunshine in December
Monte Rio, CA

Average daylight in December / Average sunshine in December - Monte Rio, CA
  • Average daylight in December: 9h and 3min

The month with the longest days is June (Average daylight: 14h and 48min).
The month with the shortest days is December (Average daylight: 9h and 30min).

  • Average sunshine in December: 5h and 2min

The month with the most sunshine is July (Average sunshine: 11h and 48min).
The month with the least sunshine is December (Average sunshine: 5h and 24min).

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Average sunshine days in December
Monte Rio, CA

Average sunshine days in December - Monte Rio, CA
  • Average sunshine days in December: 21.3 days

The month with the most sunshine days is July (28.9 days).
The month with the least sunshine days is February (19.9 days).

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Average UV index in December
Monte Rio, CA

Average UV index in December - Monte Rio, 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
Monte Rio, CA

Average cloud cover in December - Monte Rio, CA
  • Average cloud cover in December: 39

The month with the most cloud cover is March (Cloud cover 42).
The month with the least cloud cover is July (Cloud cover 11).

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Average visibility in December
Monte Rio, CA

Average visibility in December - Monte Rio, 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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Monte Rio, California, USA

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