December Weather forecast - Winter forecast

Weather in December
Frequently asked questions
Average temperature in December
Average pressure in December
Average wind speed in December
Average humidity in December
Average rainfall in December
Average rainfall days in December
Average snowfall in December
Average snowfall days in December
Average daylight in December
Average sunshine in December
Average sunshine days in December
Average UV index in December
Average cloud cover in December
Average visibility in December

The vast Sierra Vista region of Arizona

Weather in December

The first month of the winter, December, is also a moderate month in Sierra Vista, Arizona, with temperature in the range of an average low of 37.8°F (3.2°C) and an average high of 56.5°F (13.6°C).

Temperature

December is the coldest month, with an average high-temperature of 56.5°F (13.6°C) and an average low-temperature of 37.8°F (3.2°C).

Humidity

In Sierra Vista, the average relative humidity in December is 49%.

Rainfall

In Sierra Vista, it is raining for 5.7 days, with typically 0.59" (15mm) of accumulated precipitation. Throughout the year, there are 92.2 rainfall days, and 15.47" (393mm) of precipitation is accumulated.

Snowfall

Months with snowfall in Sierra Vista are January through March and December. December is the first month it typically snows in Sierra Vista, Arizona. Throughout December, in the average 1.3 snowfall days, it receives 1.22" (31mm) of snow. Throughout the year, there are 3 snowfall days, and 3.27" (83mm) of snow is accumulated.

Daylight

December has the shortest days of the year in Sierra Vista, with an average of 10h and 8min of daylight.
On the first day of December in Sierra Vista, sunrise is at 7:02 am and sunset at 5:17 pm. On the last day of the month, sunrise is at 7:20 am and sunset at 5:27 pm MST.

Sunshine

With an average of 6.9h of sunshine, December has the least sunshine of the year in Sierra Vista.

UV index

January, February, November and December, with an average maximum UV index of 3, are months with the lowest UV index in Sierra Vista. A UV Index reading of 3 to 5 represents a medium health hazard from exposure to the Sun's UV rays for the average person.
Note: In December, the average maximum UV index of 3 translate into the following recommendations:
Take precautions. Light skin individuals may get burned in less than 30 minutes. The Sun's most intense and consequently most harmful UV radiation during midday hours should be decreased by minimizing exposure and seeking shade. Sun-protective clothing, a long-sleeved shirt and pants, a wide-brimmed hat, and UVA and UVB-blocking sunglasses are particularly helpful in blocking UV radiation's harmful effects. Beware! The strength of the UV rays is increased nearly double-fold by the reflection of the snow.

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FAQ

What is the coldest month in Sierra Vista?

The coldest month in Sierra Vista is December, with an average high-temperature of 56.5°F (13.6°C) and an average low-temperature of 37.8°F (3.2°C).

What is the temperature in December in Sierra Vista?

In Sierra Vista, in December, the average high-temperature is 56.5°F (13.6°C), and the average low-temperature is 37.8°F (3.2°C). The average heat index (a.k.a. 'feels like', 'felt air temperature'), which represents the influence of relative humidity on air temperature, in September is calculated to be 82.4°F (28°C).

What is the average humidity in December in Sierra Vista?

The average relative humidity in December is 49%.

How much does it rain in Sierra Vista in December?

In Sierra Vista, in December, it is raining for 5.7 days, with typically 0.59" (15mm) of accumulated precipitation.

When does it start snowing in Sierra Vista?

December is the first month it typically snows. Throughout December, in the average 1.3 snowfall days, it receives 1.22" (31mm) of snow.

What is the month with the shortest days in Sierra Vista?

With an average of 10h and 8min of daylight, December has the shortest days of the year.

What is the average length of the day in December in Sierra Vista?

In Sierra Vista, Arizona, the average day length in December is 10h and 8min.

When are sunrise and sunset in December in Sierra Vista?

In December, on the first day of the month, sunrise is at 7:02 am and sunset at 5:17 pm. On the last day of the month, in Sierra Vista, sunrise is at 7:20 am and sunset at 5:27 pm MST.

What is the month with the least sunshine in Sierra Vista?

The month with the least sunshine in Sierra Vista, Arizona, is December, with an average of 6.9h of sunshine.

How long on average sun shines in December in Sierra Vista?

In Sierra Vista, the average sunshine duration in December is 6.9h.

What is the month with the lowest UV index in Sierra Vista?

The 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 Sierra Vista?

In December, the average daily maximum UV index is 3. A UV Index of 3 to 5 symbolizes a moderate vulnerability from unsafe exposure to Sun's UV rays.

Today

Tomorrow

Long-term

Year J F M A M J J A S O N December

Nov

December

Jan

Average high temperature

65.5°F 18.6°C

56.5°F 13.6°C

57.4°F 14.1°C

Average low temperature

Average pressure

Average wind speed

Average max. wind speed

7.9mph 12.7km/h

7.4mph 11.9km/h

7mph 11.3km/h

Average wind speed gusts

Average humidity

Average rainfall

Average rainfall days

Average snowfall

Average snowfall days

Average daylight

Average sunshine

Average sunshine days

25.6

23.5

Average UV index

Average cloud cover

Average visibility

Average temperature in December
Sierra Vista, AZ

Average high temperature in December: 56.5°F

The warmest month (with the highest average high temperature) is June (90.1°F).
The month with the lowest average high temperature is December (56.5°F).

Average low temperature in December: 37.8°F

The month with the highest average low temperature is July (69.6°F).
The coldest months (with the lowest average low temperature) are January and December (37.8°F).

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Average pressure in December
Sierra Vista, AZ

Average pressure in December: 30.05"Hg

The month with the highest atmospheric pressure is January (30.07"Hg).
The month with the lowest atmospheric pressure is June (29.84"Hg).

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Average wind speed in December
Sierra Vista, AZ

Average wind speed in December: 6.6mph

The windiest month (with the highest average wind speed) is April (9.8mph).
The calmest month (with the lowest average wind speed) is August (5.5mph).

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Average humidity in December
Sierra Vista, AZ

Average humidity in December: 49%

The month with the highest relative humidity is September (50%).
The months with the lowest relative humidity are May and June (23%).

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Average rainfall in December
Sierra Vista, AZ

Average rainfall in December: 0.59"

The wettest month (with the highest rainfall) is July (4.53").
The driest month (with the least rainfall) is May (0.12").

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Average rainfall days in December
Sierra Vista, AZ

Average rainfall days in December: 5.7 days

The month with the highest number of rainy days is July (21.3 days).
The month with the least rainy days is May (2.3 days).

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Average snowfall in December
Sierra Vista, AZ

Average snowfall in December: 1.22"

The month with the highest snowfall is February (1.46").
The months with the least snowfall are April, May, June, July, August, September, October and November (0").

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Average snowfall days in December
Sierra Vista, AZ

Average snowfall days in December: 1.3 days

The month with the highest number of snowfall days is December (1.3 days).
The months with the least snowfall days are April, May, June, July, August, September and October (0 days).

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Average daylight in December /
Average sunshine in December
Sierra Vista, AZ

Average daylight in December: 10h and 8min

The month with the longest days is June (Average daylight: 14h and 10min).
The month with the shortest days is December (Average daylight: 10h and 8min).

Average sunshine in December: 6h and 54min

The months with the most sunshine are June and August (Average sunshine: 12h and 0min).
The month with the least sunshine is December (Average sunshine: 6h and 54min).

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Average sunshine days in December
Sierra Vista, AZ

Average sunshine days in December: 23.5 days

The month with the most sunshine days is May (28.1 days).
The month with the least sunshine days is July (6.5 days).

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Average UV index in December
Sierra Vista, AZ

Average UV index in December: 3

The month with the highest UV index is June (UV index 7).
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
Sierra Vista, AZ

Average cloud cover in December: 21

The month with the most cloud cover is July (Cloud cover 24).
The month with the least cloud cover is May (Cloud cover 8).

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Average visibility in December
Sierra Vista, AZ

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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December weather forecast
Sierra Vista, AZ

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