December weather forecast
Crater Lake, OR

December solidifies the onset of the winter season in Crater Lake with a further increase in snowfall to 91.1" (2314mm). Temperatures plummet, bringing the crisp, cold winter air. The short daylight hours and long, chilly nights define the month. Rainfall is at its peak, contributing to the frosty conditions and creating thick layers of ice around the lake. Despite the cold and snow, Crater Lake continues to captivate with its mesmerizing icy landscape.

Temperature

Crater Lake's coldest temperatures are experienced in December, with average high temperatures of 33.6°F (0.9°C) and lows of 18.1°F (-7.7°C).

Rainfall

December is the month with the most rainfall. Rain falls for 18.1 days and accumulates 11.57" (294mm) of precipitation.

Snowfall

January through July, September through December are months with snowfall. The month with the most snowfall is December, when snow falls for 16.4 days and typically aggregates up to 91.1" (2314mm) of snow.

Daylight

The month with the shortest days is December, with an average of 9h and 6min of daylight.
On the first day of December in Crater Lake, sunrise is at 7:20 am and sunset at 4:35 pm. On the last day of the month, sunrise is at 7:39 am and sunset at 4:44 pm PST.

Sunshine

The months with the least sunshine are November and December, with an average of 3h of sunshine.

UV index

The month with the lowest UV index is December, with an average maximum UV index of 1. A UV Index value of 2, and less, symbolizes a minimal health vulnerability from exposure to the Sun's UV rays for the ordinary person.
Note: During December, 1 as the daily maximum UV index converts into the following advice:
Unlike children, who always need sun protection, most individuals can remain in the sun for up to an hour without getting burnt. The solar radiation is most powerful near the mid-day, so the exposure to the direct Sun should be reduced accordingly. Using UVA and UVB-protective sunglasses and sun-protective clothing is effective against UV radiation. Take heed! Reflection from the snow can almost amplify the Sun's UV radiation by double.