Mammoth Cave National Park
Kentucky, USA
Long-term weather forecast
Long-term weather forecast

December weather forecast and climate
Mammoth Cave National Park, KY

The attractive frozen Niagara in the historical Mammoth Cave National Park, Kentucky
The attractive frozen Niagara in the historical Mammoth Cave National Park, Kentucky
December, the first month of the winter, in Mammoth Cave National Park, is still a chilly month, with average temperature varying between 46.4°F (8°C) and 28.4°F (-2°C).

Temperature

In Mammoth Cave National Park, Kentucky, the average high-temperature drops, from a mild 57.2°F (14°C) in November, to a frosty 46.4°F (8°C). The average low-temperature, in Mammoth Cave National Park, is 28.4°F (-2°C).

Rainfall

In Mammoth Cave National Park, during December, the rain falls for 12 days and regularly aggregates up to 4.7" (120mm) of precipitation. In Mammoth Cave National Park, during the entire year, the rain falls for 126 days and collects up to 50.6" (1286mm) of precipitation.

Daylight

With an average of 9.6h of daylight, December has the shortest days of the year in Mammoth Cave National Park.

Sunshine

Months with the least sunshine in Mammoth Cave National Park, Kentucky, are January and December, with an average of 4h of sunshine.

UV index

Months with the lowest UV index in Mammoth Cave National Park are January and December, with an average maximum UV index of 2. A UV Index estimate of 2, and below, represents a low health risk from the exposure to the Sun's UV rays for average individuals.
In December, the average maximum UV index of 2 translate into the following recommendations:
Extended sun exposure is not an issue for the majority. Children, infants, and fair-skinned individuals always need to be protected. The solar radiation is most powerful near the mid-day, so the exposure to the direct Sun should be reduced accordingly. Sun-protective clothing, a long-sleeved shirt and pants, a wide-brimmed hat, and UVA and UVB-blocking sunglasses are particularly helpful in blocking UV radiation's harmful effects.

What is the temperature in December in Mammoth Cave National Park?

In Mammoth Cave National Park, in December, the average high-temperature is 46.4°F (8°C), and the average low-temperature is 28.4°F (-2°C).

How many days does it rain in December in Mammoth Cave National Park?

In Mammoth Cave National Park, in December, it is raining for 12 days, with typically 4.7" (120mm) of accumulated precipitation.

What is the month with the shortest days in Mammoth Cave National Park?

With an average of 9.6h of daylight, December has the shortest days of the year in Mammoth Cave National Park.

What is the average length of the day in December in Mammoth Cave National Park?

The average length of the day in December in Mammoth Cave National Park is 9.6h.

What is the month with the least sunshine in Mammoth Cave National Park?

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

How long on average sun shines in December in Mammoth Cave National Park?

In Mammoth Cave National Park, the average sunshine in December is 4h.

What are the months with the lowest UV index in Mammoth Cave National Park?

Months with the lowest UV index in Mammoth Cave National Park, Kentucky, are January and December, with an average maximum UV index of 2.

What is the UV index intensity in December in Mammoth Cave National Park?

In Mammoth Cave National Park, Kentucky, the average daily maximum UV index in December is 2. A UV Index value of 2, and less, symbolizes a low health risk from unsafe exposure to the Sun's UV rays.
Average temperature in December - Mammoth Cave National Park, KY
  • Average high temperature in December: 46°F

The warmest month (with the highest average high temperature) is July (88°F).
The month with the lowest average high temperature is January (41°F).

  • Average low temperature in December: 28°F

The month with the highest average low temperature is July (66°F).
The coldest month (with the lowest average low temperature) is January (23°F).

Average rainfall in December - Mammoth Cave National Park, KY
  • Average rainfall in December: 4.7"

The wettest month (with the highest rainfall) is May (5").
The driest month (with the lowest rainfall) is October (3").

Average rainfall days in December - Mammoth Cave National Park, KY
  • Average rainfall days in December: 12 days

The month with the highest number of rainy days is March (13 days).
Months with the lowest number of rainy days are September and October (8 days).

Average daylight in December / Average sunshine in December - Mammoth Cave National Park, KY
  • Average daylight in December: 9.6h

The month with the longest days is June (Average daylight: 14.7h).
The month with shortest days is December (Average daylight: 9.6h).

  • Average sunshine in December: 4h

The month with most sunshine is June (Average sunshine: 10h).
Months with least sunshine are January and December (Average sunshine: 4).

Average UV index in December - Mammoth Cave National Park, KY
  • Average UV index in December: 2

Months with the highest UV index are June and July (UV index 10).
Months with the lowest UV index are January and December (UV index 2).