December weather forecast
Montclair, CA

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Weather in December

The first month of the winter, December, is also an enjoyable month in Montclair, California, with an average temperature varying between 62.1°F and 45.5°F.

Temperature

Montclair's coldest weather arrives in December, when temperatures average a high of 62.1°F and a low of 45.5°F.

Humidity

In Montclair, the average relative humidity in December is 51%.

Rainfall

In Montclair, California, during December, the rain falls for 6.4 days and regularly aggregates up to 1.69" of precipitation. Throughout the year, there are 49.6 rainfall days, and 7.8" of precipitation is accumulated.

Snowfall

In Montclair, snow does not fall in January, March through December.

Daylight

With an average of 9h and 54min of daylight, December has the shortest days of the year in Montclair, California.
On the first day of December in Montclair, sunrise is at 6:38 am and sunset at 4:41 pm. On the last day of the month, sunrise is at 6:56 am and sunset at 4:51 pm PST.

Sunshine

February and December, with an average of 6.9h of sunshine, are months with the least sunshine.

UV index

The month with the lowest UV index in Montclair is December, with an average maximum UV index of 3. A UV Index reading of 3 to 5 represents a medium health hazard from unprotected exposure to Sun's UV rays for ordinary individuals.
Note: The daily maximum UV index of 3 in December interprets into the following advice:
Preventative actions are necessary - Recommendations to ward off sunburn are given. It's crucial to reduce time in the direct Sun around mid-day due to the intense solar radiation. To cut down UV radiation exposure by about half, sport a wide-brim hat.
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FAQ

What part of the year is the coldest in Montclair?

December, recording an average high temperature of 62.1°F and a low temperature of 45.5°F, is Montclair's coldest month.

What is the temperature in December in Montclair?

In Montclair, 62.1°F is the average high-temperature and 45.5°F is the average low-temperature during December. The average heat index (a.k.a. 'apparent temperature', 'feels like'), which represents the influence of relative humidity on air temperature, in September is estimated at 89.6°F.

What is the average humidity in December in Montclair?

The average relative humidity in December in Montclair is 51%.

How many days does it rain in December in Montclair?

In December, in Montclair, the rain falls for 6.4 days. Throughout December, 1.69" of precipitation is accumulated.

When it does not snow in Montclair?

January, March through December are months without snowfall in Montclair.

What is the month with the shortest days in Montclair?

The month with the shortest days is December, with an average of 9h and 54min of daylight.

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

In Montclair, California, the average day length in December is 9h and 56min.

When is the sunrise / sunset in December in Montclair?

In December, on the first day of the month, sunrise is at 6:38 am and sunset at 4:41 pm. On the last day of the month, in Montclair, sunrise is at 6:56 am and sunset at 4:51 pm PST.

What is the month with the least sunshine in Montclair?

February and December, with an average of 6.9h of sunshine, are months with the least sunshine.

How many hours of sunshine does Montclair have in December?

In December, the average sunshine duration in Montclair, California, is 6.9h.

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

December is the month with the lowest UV index in Montclair, with an average maximum UV index of 3.

What is the UV index intensity in December in Montclair?

The average daily maximum UV index in December in Montclair, California, is 3. A UV Index value of 3 to 5 symbolizes a medium health risk from unprotected exposure to UV radiation.
Average high temperature
Average low temperature
Average pressure
Average wind speed
Average max. wind speed
Average wind speed gusts
Average humidity
Average rainfall
Average rainfall days
Average snowfall days
Average daylight
Average sunshine
Average sunshine days
Average UV index
Average cloud cover
Average visibility

Average temperature in December
Montclair, CA

Average temperature in December - Montclair, CA
  • Average high temperature in December: 62.1°F

The warmest month (with the highest average high temperature) is August (91°F).
The month with the lowest average high temperature is December (62.1°F).

  • Average low temperature in December: 45.5°F

The month with the highest average low temperature is August (65.8°F).
The coldest month (with the lowest average low temperature) is December (45.5°F).

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Average pressure in December
Montclair, CA

Average pressure in December - Montclair, CA
  • Average pressure in December: 30.07"Hg

The month with the highest atmospheric pressure is January (30.1"Hg).
The month with the lowest atmospheric pressure is June (29.86"Hg).

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Average wind speed in December
Montclair, CA

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

The windiest months (with the highest average wind speed) are April and May (5.8mph).
The calmest month (with the lowest average wind speed) is September (4.4mph).

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Average humidity in December
Montclair, CA

Average humidity in December - Montclair, CA
  • Average humidity in December: 51%

The months with the highest relative humidity are March and May (54%).
The month with the lowest relative humidity is August (42%).

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Average rainfall in December
Montclair, CA

Average rainfall in December - Montclair, CA
  • Average rainfall in December: 1.69"

The wettest month (with the highest rainfall) is February (1.77").
The driest month (with the least rainfall) is June (0.04").

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Average rainfall days in December
Montclair, CA

Average rainfall days in December - Montclair, CA
  • Average rainfall days in December: 6.4 days

The month with the highest number of rainy days is March (7.1 days).
The month with the least rainy days is June (1.2 days).

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Average snowfall days in December
Montclair, CA

Average snowfall days in December - Montclair, CA
  • Average snowfall days in December: 0 days

The month with the highest number of snowfall days is February (0.1 days).
The months with the least snowfall days are January, March, April, May, June, July, August, September, October, November and December (0 days).

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

Average daylight in December / Average sunshine in December - Montclair, CA
  • Average daylight in December: 9h and 5min

The month with the longest days is June (Average daylight: 14h and 24min).
The month with the shortest days is December (Average daylight: 9h and 54min).

  • Average sunshine in December: 6h and 5min

The month with the most sunshine is July (Average sunshine: 12h and 6min).
The months with the least sunshine are February and December (Average sunshine: 6h and 54min).

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Average sunshine days in December
Montclair, CA

Average sunshine days in December - Montclair, CA
  • Average sunshine days in December: 23.2 days

The month with the most sunshine days is June (28.2 days).
The month with the least sunshine days is February (21.5 days).

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Average UV index in December
Montclair, CA

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

The months with the highest UV index are July and August (UV index 7).
The month with the lowest UV index is December (UV index 3).

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Average cloud cover in December
Montclair, CA

Average cloud cover in December - Montclair, CA
  • Average cloud cover in December: 21

The month with the most cloud cover is December (Cloud cover 21).
The month with the least cloud cover is August (Cloud cover 5).

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Average visibility in December
Montclair, CA

Average visibility in December - Montclair, 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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Montclair, California, USA

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