December weather forecast
Grand Canyon National Park, AZ

Wrapping up the year with a cold bang, December in Grand Canyon National Park frequently features temperatures dipping to 36°F (2.2°C). Winter officially begins with rainfall simulating the January pattern. Overall, it is a rather chilly and damp month with rare occurrences of sunshine. The daylight hours are reduced substantially as the year inches towards its end. A unique sight to behold, snow lovers would appreciate the sporadic snowfall this month endorses.

Temperature

January and December mark Grand Canyon National Park's lowest temperatures, averaging a high-temperature of 55°F (12.8°C).

Rainfall

In Grand Canyon National Park, during December, the rain falls for 3 days and regularly aggregates up to 0.75" (19mm) of precipitation. Throughout the year, in Grand Canyon National Park, there are 33 rainfall days, and 9.69" (246mm) of precipitation is accumulated.

Snowfall

January and December are months with snowfall in Grand Canyon National Park. December is the first month it typically snows in Grand Canyon National Park, Arizona. Throughout December, Grand Canyon National Park receives 0.04" (1mm) of snow. Throughout the year, 0.2" (5mm) of snow is accumulated.

Daylight

With an average of 9h and 48min of daylight, December has the shortest days of the year.
On the first day of December, sunrise is at 7:21 am and sunset at 5:14 pm. On the last day of the month, sunrise is at 7:39 am and sunset at 5:24 pm MST.

Sunshine

The months with the least sunshine in Grand Canyon National Park are January and December, with an average of 7h of sunshine.

UV index

December is the month with the lowest UV index, with an average maximum UV index of 2. A UV Index of 2, and less, symbolizes a minimal health vulnerability from exposure to the Sun's UV radiation for average individuals.
Note: The daily high UV index of 2 in December translates into this advice:
While many people can endure lengthy sun exposure, it remains imperative to safeguard babies, children, and fair-skinned individuals. Considering the harmful UV rays from the Sun during midday, it's essential to reduce exposure. Combat UV radiation's detrimental effects with sun-safe clothing and UV-blocking eyewear. Consider carefully! The reflective quality of snow can almost double the intensity of the Sun's UV radiation.