December weather forecast
Mammoth Cave National Park, KY

Wrapping up the year, December reincorporates the coldest temperatures similar to those of January, with a high of 46°F (7.8°C). Paired with substantial rainfall and shorter daylight hours, a noticeable winter chill dominates the park. The UV index also hits its low, presenting minimal sun exposure. Despite these cold conditions, the serene winter landscape offers a distinctive charm. As the year concludes, the weather fosters a calm, pristine beauty typical of winter's embrace.

Temperature

December comes with a decrease in the average high-temperature, falling from a moderate 57.2°F (14°C) in November to a chilly 46.4°F (8°C). Mammoth Cave National Park temperatures generally rest at a low of 28.4°F (-2°C) during the December nights.

Rainfall

In Mammoth Cave National Park, during December, the rain falls for 12 days and regularly aggregates up to 4.72" (120mm) of precipitation. Throughout the year, there are 126 rainfall days, and 50.63" (1286mm) of precipitation is accumulated.

Daylight

With an average of 9h and 42min of daylight, December has the shortest days of the year.
On the first day of December, sunrise is at 6:40 am and sunset at 4:27 pm. On the last day of the month, sunrise is at 6:58 am and sunset at 4:37 pm CST.

Sunshine

The months with the least sunshine are January and December, with an average of 4h of sunshine.

UV index

January and December, with an average maximum UV index of 2, are months with the lowest UV index. A UV Index reading of 2, and below, represents a low threat to health from exposure to the Sun's UV radiation for ordinary individuals.
Note: The maximum daily UV index of 2 in December interprets into the following recommendations:
Most individuals face no major issues with lengthy exposure to the sun, but children, infants, and individuals with fair skin always require protection. UV radiation is strongest from the Sun during midday; protect yourself by staying in shaded areas. Consider a wide-brim hat essential for effective sun defense covering your face, neck, and eyes.