December weather forecast
Tucson, AZ

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Sunset in downtown Tucson, Arizona with a skyline and a sentinel peak in the distance
Sunset in downtown Tucson, Arizona with a skyline and a sentinel peak in the distance

Weather in December

December in Tucson brings a festive chill to the cityscape, maintaining a balanced, desert winter atmosphere. A sacrosanct harmony between the cool temperatures and comfortable humidity marks the city's weather. The transition between December and January unveils a subtle change, considering the steady winter climate in Tucson. The increased relative humidity, coupled with shorter daylight hours, makes for a picturesque southwestern winter. The winter month ends on a colder note, with temperatures dropping to a low 43°F (6.1°C) just as it does in the first month of the year.

Temperature

Tucson's coldest month, December, generally records average temperatures ranging from a high of 60.8°F (16°C) to a low of 43°F (6.1°C).

Humidity

With an average relative humidity of 45%, December is the most humid month.

Rainfall

In December, the rain falls for 6.2 days. Throughout December, 0.83" (21mm) of precipitation is accumulated. Throughout the year, there are 66.1 rainfall days, and 7.95" (202mm) of precipitation is accumulated.

Snowfall

February through December are months without snowfall.

Daylight

The month with the shortest days is December, with an average of 10h and 6min of daylight.
On the first day of December, sunrise is at 7:07 am and sunset at 5:18 pm. On the last day of the month, sunrise is at 7:24 am and sunset at 5:29 pm MST.

Sunshine

With an average of 7h of sunshine, December has the least sunshine of the year.

UV index

The months with the lowest UV index in Tucson are November and December, with an average maximum UV index of 3. A UV Index of 3 to 5 symbolizes a moderate threat to health from exposure to the Sun's UV rays for the average person.
Note: A daily maximum UV index of 3 in December translates into the following instructions:
Preventative actions are necessary - The mandate to avoid skin and eye damage is in place. Exposing oneself to the midday Sun can be harmful due to the strong UV radiation; limit your time outside. Employ a wide-brim hat for potent defense against up to 50% of UV rays.
Updated: Aug 17, 2024
Published by: Weather U.S. | About Us
Data Sources | Weather Forecasting & Climate

Frequently asked questions

What are the coldest months?

December stands out as Tucson's coldest month, with an average high-temperature of 60.8°F (16°C) and a low-temperature of 43°F (6.1°C).

What is the temperature in December?

Tucson in December has an average high-temperature of 60.8°F (16°C) and an average low-temperature of 43°F (6.1°C). In September, the average heat index (a.k.a. 'apparent temperature', 'real feel'), which combines air temperature and relative humidity, is estimated at 89.6°F (32°C).

What is the most humid month?

With an average relative humidity of 45%, December is the most humid month.

What is the average humidity in December?

In December, the average relative humidity is 45%.

How many days does it rain in December?

In Tucson, in December, it is raining for 6.2 days, with typically 0.83" (21mm) of accumulated precipitation.

When it does not snow?

In Tucson, snow does not fall in February through December.

Does it snow in December?

In Tucson, in December, it doesn't snow. In January, it regularly snows.

What is the month with the shortest days?

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

What is the average length of the day in December?

In December, the average day length is 10h and 5min.

When is the sunrise / sunset in December?

In December, on the first day of the month, sunrise is at 7:07 am and sunset at 5:18 pm. On the last day of the month, sunrise is at 7:24 am and sunset at 5:29 pm MST.

What is the month with the least sunshine?

With an average of 7h of sunshine, December has the least sunshine of the year.

How many hours of sunshine does Tucson have in December?

In Tucson, the average sunshine duration in December is 7h.

What are the months with the lowest UV index?

November and December, with an average maximum UV index of 3, are months with the lowest UV index.

What is the UV index reading in December?

In December, the average daily maximum UV index is 3. A UV Index value of 3 to 5 symbolizes a medium health risk from unprotected exposure to UV radiation.
Average humidity
Average rainfall days
Average snowfall
Average snowfall days
Average daylight
Average sunshine
Average sunshine days
Average UV index
Average cloud cover
Average visibility

Average temperature in December
Tucson, AZ

Average temperature in December - Tucson, AZ
  • Average high temperature in December: 60.8°F

The warmest month (with the highest average high temperature) is June (96.6°F).
The month with the lowest average high temperature is December (60.8°F).

  • Average low temperature in December: 43°F

The month with the highest average low temperature is July (77°F).
The coldest months (with the lowest average low temperature) are January and December (43°F).

Average pressure in December
Tucson, AZ

Average pressure in December - Tucson, AZ
  • Average pressure in December: 30.05"Hg

The month with the highest atmospheric pressure is January (30.08"Hg).
The month with the lowest atmospheric pressure is June (29.83"Hg).

Average wind speed in December
Tucson, AZ

Average wind speed in December - Tucson, AZ
  • Average wind speed in December: 6.3mph

The windiest months (with the highest average wind speed) are April and May (8.1mph).
The calmest month (with the lowest average wind speed) is August (5.5mph).

Average humidity in December
Tucson, AZ

Average humidity in December - Tucson, AZ
  • Average humidity in December: 45%

The month with the highest relative humidity is December (45%).
The month with the lowest relative humidity is June (19%).

Average rainfall in December
Tucson, AZ

Average rainfall in December - Tucson, AZ
  • Average rainfall in December: 0.83"

The wettest month (with the highest rainfall) is July (1.42").
The driest month (with the least rainfall) is May (0.08").

Average rainfall days in December
Tucson, AZ

Average rainfall days in December - Tucson, AZ
  • Average rainfall days in December: 6.2 days

The month with the highest number of rainy days is July (13.3 days).
The month with the least rainy days is May (1.3 days).

Average snowfall in December
Tucson, AZ

Average snowfall in December - Tucson, AZ
  • Average snowfall in December: 0"

The month with the highest snowfall is January (0.08").
The months with the least snowfall are February, March, April, May, June, July, August, September, October, November and December (0").

Average snowfall days in December
Tucson, AZ

Average snowfall days in December - Tucson, AZ
  • Average snowfall days in December: 0 days

The month with the highest number of snowfall days is January (0.2 days).
The months with the least snowfall days are February, March, April, May, June, July, August, September, October, November and December (0 days).

Average daylight in December /
Average sunshine in December
Tucson, AZ

Average daylight in December / Average sunshine in December - Tucson, 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: 7h and 0min

The month with the most sunshine is August (Average sunshine: 12h and 12min).
The month with the least sunshine is December (Average sunshine: 7h and 0min).

Average sunshine days in December
Tucson, AZ

Average sunshine days in December - Tucson, AZ
  • Average sunshine days in December: 23.9 days

The month with the most sunshine days is May (29.3 days).
The month with the least sunshine days is July (13.3 days).

Average UV index in December
Tucson, AZ

Average UV index in December - Tucson, AZ
  • Average UV index in December: 3

The month with the highest UV index is June (UV index 8).
The months with the lowest UV index are November and December (UV index 3).

Average cloud cover in December
Tucson, AZ

Average cloud cover in December - Tucson, AZ
  • Average cloud cover in December: 19

The month with the most cloud cover is December (Cloud cover 19).
The months with the least cloud cover are May and June (Cloud cover 7).

Average visibility in December
Tucson, AZ

Average visibility in December - Tucson, 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).

Tucson, Arizona, USA

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