December weather forecast
Sierra Vista, AZ

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The vast Sierra Vista region of Arizona
The vast Sierra Vista region of Arizona

Weather in December

December in Sierra Vista is characterized by the chills of winter. The city faces its coldest month, with temperatures dropping down to a daily average low of 37.8°F (3.2°C). Snow showers happen occasionally, usually amounting to an average snowfall of 1.22" (31mm), adding a picturesque winter aura to the city. Despite the dip in temperature and shorter daylight hours, sightseeing and outdoor activities remain enjoyable because of the city’s bright, sunny days.

Temperature

In Sierra Vista, Arizona, the month of December is known for its lowest average temperatures, reaching a high of 56.5°F (13.6°C) and a low of 37.8°F (3.2°C).

Humidity

In December, the average relative humidity is 49%.

Rainfall

In December, in Sierra Vista, the rain falls for 5.7 days. Throughout December, 0.59" (15mm) of precipitation is accumulated. Throughout the year, in Sierra Vista, there are 92.2 rainfall days, and 15.47" (393mm) of precipitation is accumulated.

Snowfall

January through March and December are months with snowfall in Sierra Vista, Arizona. December is the first month it typically snows. Throughout December, in the average 1.3 snowfall days, it receives 1.22" (31mm) of snow. In Sierra Vista, Arizona, during the entire year, snow falls for 3 days and aggregates up to 3.27" (83mm) of snow.

Daylight

December has the shortest days of the year in Sierra Vista, with an average of 10h and 6min of daylight.
On the first day of December in Sierra Vista, sunrise is at 7:03 am and sunset at 5:17 pm. On the last day of the month, sunrise is at 7:20 am and sunset at 5:28 pm MST.

Sunshine

The month with the least sunshine is December, with an average of 6.9h of sunshine.

UV index

January, February, November and December, with an average maximum UV index of 3, are months with the lowest UV index. A UV Index of 3 to 5 symbolizes a moderate threat to health from unsafe exposure to UV radiation for the average person.
Note: In December, the average maximum UV index of 3 translates into the following recommendations:
Act with care - The suggestion to avoid sunburn is emphasized. UV radiation from the Sun is most dangerous during midday; take precautions and seek shade. Protect your eyes, ears, face, and neck from the Sun by wearing a wide-brimmed hat. Be aware! The reflective nature of snow can magnify the Sun's UV radiation almost twofold.

Frequently asked questions

What is the coldest time of year in Sierra Vista?

In Sierra Vista, December records the average lowest temperatures, peaking at 56.5°F (13.6°C) and reaching a low of 37.8°F (3.2°C).

What are the temperatures in Sierra Vista in December?

Sierra Vista in December has an average high-temperature of 56.5°F (13.6°C) and an average low-temperature of 37.8°F (3.2°C). In September, the average heat index (a.k.a. 'apparent temperature', 'real feel'), which combines air temperature and relative humidity, 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 in Sierra Vista is 49%.

How much does it rain in Sierra Vista in December?

In December, in Sierra Vista, the rain falls for 5.7 days. Throughout December, 0.59" (15mm) of precipitation is accumulated.

When does it start to snow in Sierra Vista?

December is the first month it typically snows in Sierra Vista. 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?

December has the shortest days of the year in Sierra Vista, with an average of 10h and 6min of daylight.

How many hours of daylight does Sierra Vista have in December?

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 7:03 am and sunset at 5:17 pm. On the last day of the month, sunrise is at 7:20 am and sunset at 5:28 pm MST.

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

The month with the least sunshine is December, with an average of 6.9h of sunshine.

How many hours of sunshine does Sierra Vista have in December?

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

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

The months with the lowest UV index in Sierra Vista, Arizona, are January, February, November and December, with an average maximum UV index of 3.

What is the UV index intensity in December in Sierra Vista?

The average daily maximum UV index in December in Sierra Vista is 3. A UV Index of 3 to 5 symbolizes a moderate vulnerability from unprotected exposure to UV radiation.
Average humidity
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
Sierra Vista, AZ

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).

Average pressure in December
Sierra Vista, AZ

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).

Average wind speed in December
Sierra Vista, AZ

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).

Average humidity in December
Sierra Vista, AZ

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%).

Average rainfall in December
Sierra Vista, AZ

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").

Average rainfall days in December
Sierra Vista, AZ

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).

Average snowfall in December
Sierra Vista, AZ

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").

Average snowfall days in December
Sierra Vista, AZ

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).

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

Average daylight in December / Average sunshine in December - Sierra Vista, AZ
  • Average daylight in December: 10h and 1min

The month with the longest days is June (Average daylight: 14h and 12min).
The month with the shortest days is December (Average daylight: 10h and 6min).

  • Average sunshine in December: 6h and 5min

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).

Average sunshine days in December
Sierra Vista, AZ

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).

Average UV index in December
Sierra Vista, AZ

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).

Average cloud cover in December
Sierra Vista, AZ

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).

Average visibility in December
Sierra Vista, AZ

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).

Sierra Vista, Arizona, USA

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