December weather forecast and climate
Bostonia, CA

Weather in December

December, the first month of the winter, in Bostonia, is still a comfortable month, with average temperature fluctuating between 63.7°F (17.6°C) and 47.8°F (8.8°C).

Temperature

December is the coldest month, with an average high-temperature of 63.7°F (17.6°C) and an average low-temperature of 47.8°F (8.8°C).

Humidity

The average relative humidity in Bostonia is 59%.

Rainfall

In Bostonia, during December, the rain falls for 5.9 days and regularly aggregates up to 1.42" (36mm) of precipitation. In Bostonia, during the entire year, the rain falls for 56.1 days and collects up to 8.27" (210mm) of precipitation.

Daylight

December has the shortest days of the year in Bostonia, with an average of 10h of daylight.

Sunshine

With an average of 6.7h of sunshine, December has the least sunshine of the year.

UV index

January, February, November and December, with an average maximum UV index of 4, are months with the lowest UV index in Bostonia. A UV Index value of 3 to 5 symbolizes a moderate threat to health from unsafe exposure to the UV radiation for average individuals.
Note: In December, the average maximum UV index of 4 translate into the following recommendations:
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 Bostonia?

With an average high-temperature of 63.7°F (17.6°C) and an average low-temperature of 47.8°F (8.8°C), December is the coldest month in Bostonia.

What is the temperature in December in Bostonia?

In December, the average high-temperature is 63.7°F (17.6°C), and the average low-temperature is 47.8°F (8.8°C).

What is the average humidity in December in Bostonia?

In Bostonia, the average relative humidity in December is 59%.

How many days does it rain in December in Bostonia?

In Bostonia, in December, it is raining for 5.9 days, with typically 1.42" (36mm) of accumulated precipitation.

What is the month with the shortest days in Bostonia?

The month with the shortest days in Bostonia, California, is December, with an average of 10h of daylight.

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

In Bostonia, the average length of the day in December is 10h.

What is the month with the least sunshine in Bostonia?

The month with the least sunshine is December, with an average of 6.7h of sunshine.

How long on average sun shines in December in Bostonia?

In Bostonia, California, the average sunshine in December is 6.7h.

What are the months with the lowest UV index in Bostonia?

January, February, November and December, with an average maximum UV index of 4, are months with the lowest UV index in Bostonia, California.

How high is the UV index in December in Bostonia?

In Bostonia, California, the average daily maximum UV index in December is 4. A UV Index estimate of 3 to 5 represents a moderate vulnerability from the exposure to the Sun's UV radiation.

Average temperature in December
Bostonia, CA

Average temperature in December - Bostonia, CA
  • Average high temperature in December: 63.7°F

The warmest month (with the highest average high temperature) is August (83.8°F).
The month with the lowest average high temperature is December (63.7°F).

  • Average low temperature in December: 47.8°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 (47.8°F).

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Average pressure in December
Bostonia, CA

Average pressure in December - Bostonia, CA
  • Average pressure in December: 30.06"

The month with the highest atmospheric pressure is January (30.09").
Months with the lowest atmospheric pressure are June and September (29.87").

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Average wind speed in December
Bostonia, CA

Average wind speed in December - Bostonia, CA
  • Average wind speed in December: 4.8mph

The windiest month (with the highest average wind speed) is April (5.5mph).
The calmest month (with the lowest average wind speed) is October (4.3mph).

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Average humidity in December
Bostonia, CA

Average humidity in December - Bostonia, CA
  • Average humidity in December: 59%

The month with the highest relative humidity is May (66%).
The month with the lowest relative humidity is November (53%).

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Average rainfall in December
Bostonia, CA

Average rainfall in December - Bostonia, CA
  • Average rainfall in December: 1.42"

The wettest month (with the highest rainfall) is February (1.81").
The driest month (with the least rainfall) is June (0.04").

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Average rainfall days in December
Bostonia, CA

Average rainfall days in December - Bostonia, CA
  • Average rainfall days in December: 5.9 days

The month with the highest number of rainy days is March (7.7 days).
The month with the least rainy days is June (1.4 days).

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

Average daylight in December / Average sunshine in December - Bostonia, CA
  • Average daylight in December: 10h

The month with the longest days is June (Average daylight: 14.3h).
The month with the shortest days is December (Average daylight: 10h).

  • Average sunshine in December: 6.7h

The month with the most sunshine is July (Average sunshine: 12.1h).
The month with the least sunshine is December (Average sunshine: 6.7h).

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Average sunshine days in December
Bostonia, CA

Average sunshine days in December - Bostonia, CA
  • Average sunshine days in December: 24.7 days

The month with the most sunshine days is June (27.7 days).
The month with the least sunshine days is February (21.9 days).

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Average UV index in December
Bostonia, CA

Average UV index in December - Bostonia, CA
  • Average UV index in December: 4

Months with the highest UV index are June, July, August and September (UV index 6).
Months with the lowest UV index are January, February, November and December (UV index 4).

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Average cloud cover in December
Bostonia, CA

Average cloud cover in December - Bostonia, CA
  • Average cloud cover in December: 23

Months with the most cloud cover are March and December (Cloud cover 23).
The month with the least cloud cover is August (Cloud cover 7).

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Average visibility in December
Bostonia, CA

Average visibility in December - Bostonia, 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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