Tucson
Arizona, USA
Long-term weather forecast
Long-term weather forecast

December weather forecast and climate
Tucson, AZ

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
December, the first month of the winter, in Tucson, is still a comfortable month, with average temperature ranging between max 64.8°F (18.2°C) and min 39°F (3.9°C).

Temperature

With an average high-temperature of 64.8°F (18.2°C) and an average low-temperature of 39°F (3.9°C), December is the coldest month.

Humidity

With an average relative humidity of 50%, December is the most humid month.

Rainfall

In Tucson, during December, the rain falls for 4.7 days and regularly aggregates up to 0.9" (23.6mm) of precipitation. Throughout the year, there are 52.9 rainfall days, and 11.6" (294.4mm) of precipitation is accumulated.

Snowfall

January, February and December are months with snowfall. December is the first month it typically snows in Tucson. Throughout December, in the average 0.1 snowfall days, it receives 0.1" (2.5mm) of snow. In Tucson, Arizona, during the entire year, snow falls for 0.5 days, and aggregates up to 0.6" (15.2mm) of snow.

Daylight

The month with the shortest days is December, with an average of 10.1h of daylight.

Sunshine

With an average of 7.9h of sunshine, December has the least sunshine of the year in Tucson.

UV index

The month with the lowest UV index in Tucson is December, with an average maximum UV index of 3. A UV Index estimate of 3 to 5 represents a moderate health risk from the exposure to the Sun's UV radiation for average individuals.
Note: In December, the average maximum UV index of 3 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. Caution! The reflection of snow can nearly double the intensity of the Sun's UV radiation.

What is the coldest month in Tucson?

With an average high-temperature of 64.8°F (18.2°C) and an average low-temperature of 39°F (3.9°C), December is the coldest month.

What is the temperature in December in Tucson?

In Tucson, in December, the average high-temperature is 64.8°F (18.2°C), and the average low-temperature is 39°F (3.9°C).

What is the most humid month in Tucson?

With an average relative humidity of 50%, December is the most humid month in Tucson.

What is the average humidity in December in Tucson?

The average relative humidity in December in Tucson, Arizona, is 50%.

How many days does it rain in December in Tucson?

In Tucson, Arizona, during December, the rain falls for 4.7 days and regularly aggregates up to 0.9" (23.6mm) of precipitation.

When does it start snowing in Tucson?

December is the first month it typically snows in Tucson, Arizona. Throughout December, in the average 0.1 snowfall days, it receives 0.1" (2.5mm) of snow.

What is the month with the shortest days in Tucson?

The month with the shortest days in Tucson, Arizona, is December, with an average of 10.1h of daylight.

How many hours of daylight does Tucson have in December?

In Tucson, the average length of the day in December is 10.1h.

What is the month with the least sunshine in Tucson?

The month with the least sunshine in Tucson is December, with an average of 7.9h of sunshine.

How many hours of sunshine does Tucson have in December?

In December, the average sunshine in Tucson is 7.9h.

When is the lowest UV index in Tucson?

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

What is the UV index reading in December in Tucson?

In December, the average daily maximum UV index in Tucson, Arizona, is 3. A UV Index value of 3 to 5 symbolizes a medium hazard to health from the exposure to the Sun's UV radiation.
Average temperature in December - Tucson, AZ
  • Average high temperature in December: 64.8°F

The warmest month (with the highest average high temperature) is June (100.3°F).
The month with the lowest average high temperature is December (64.8°F).

  • Average low temperature in December: 39.1°F

The month with the highest average low temperature is July (74.4°F).
The coldest month (with the lowest average low temperature) is December (39.1°F).

Average humidity in December - Tucson, AZ
  • Average humidity in December: 50%

The month with the highest relative humidity is December (50%).
The month with the lowest relative humidity is June (21.1%).

Average rainfall in December - Tucson, AZ
  • Average rainfall in December: 0.9"

The wettest month (with the highest rainfall) is August (2.4").
Driest months (with the lowest rainfall) are May and June (0.2").

Average rainfall days in December - Tucson, AZ
  • Average rainfall days in December: 4.7 days

The month with the highest number of rainy days is July (9.8 days).
The month with the lowest number of rainy days is June (1.7 days).

Average snowfall in December - Tucson, AZ
  • Average snowfall in December: 0.1"

The month with the highest snowfall is January (0.3").
Months with the lowest snowfall are March, April, May, June, July, August, September, October and November (0").

Average snowfall days in December - Tucson, AZ
  • Average snowfall days in December: 0.1 days

Months with the highest number of snowfall days are January and February (0.2 days).
Months with the lowest number of snowfall days are March, April, May, June, July, August, September, October and November (0 days).

Average daylight in December / Average sunshine in December - Tucson, AZ
  • Average daylight in December: 10.1h

The month with the longest days is June (Average daylight: 14.2h).
The month with shortest days is December (Average daylight: 10.1h).

  • Average sunshine in December: 7.9h

The month with most sunshine is June (Average sunshine: 13.2h).
The month with least sunshine is December (Average sunshine: 7.9h).

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

Months with the highest UV index are May, June, July and August (UV index 11).
The month with the lowest UV index is December (UV index 3).