Louisville
Kentucky, USA
Long-term weather forecast
Long-term weather forecast

December weather forecast and climate
Louisville, KY

A distant view of the Louisville city, Kentucky, from across the bridge, at dusk, reflected in the water below
A distant view of the Louisville city, Kentucky, from across the bridge, at dusk, reflected in the water below
The first month of the winter, December, is also a frosty month in Louisville, Kentucky, with average temperature varying between 45.9°F (7.7°C) and 30°F (-1.1°C).

Temperature

In Louisville, the average high-temperature decreases, from a moderate 57.9°F (14.4°C) in November, to a frosty 45.9°F (7.7°C). In December, the average low-temperature is 30°F (-1.1°C).

Humidity

In December, the average relative humidity in Louisville, Kentucky, is 70.2%.

Rainfall

In Louisville, Kentucky, it is raining for 12 days, with typically 3.8" (97.3mm) of accumulated precipitation. Throughout the year, in Louisville, Kentucky, there are 122.8 rainfall days, and 44.9" (1140.9mm) of precipitation is accumulated.

Snowfall

January through April, October through December are months with snowfall. In Louisville, during December, snow falls for 2.9 days and regularly aggregates up to 2.6" (66mm) of snow. Throughout the year, there are 11.8 snowfall days, and 12.5" (317.4mm) of snow is accumulated.

Daylight

With an average of 9.5h of daylight, December has the shortest days of the year in Louisville.

Sunshine

December has the least sunshine of the year, with an average of 3.8h of sunshine.

UV index

January and December, with an average maximum UV index of 2, are months with the lowest UV index in Louisville, Kentucky. A UV Index estimate of 2, and below, represents a minimal health vulnerability from the exposure to the Sun's UV radiation for the average person.
Note: 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. Beware! The strength of the UV rays is increased nearly double-fold by the reflection of the snow.

What is the temperature in December in Louisville?

In Louisville, Kentucky, in December, the average high-temperature is 45.9°F (7.7°C), and the average low-temperature is 30°F (-1.1°C).

What is the average humidity in December in Louisville?

In Louisville, the average relative humidity in December is 70.2%.

How many days does it rain in December in Louisville?

In December, the rain falls for 12 days. Throughout December, 3.8" (97.3mm) of precipitation is accumulated.

How many days does it snow in December in Louisville?

In Louisville, Kentucky, in December, snow falls for 2.9 days, with typically accumulated 2.6" (66mm) of snow.

What is the month with the shortest days in Louisville?

With an average of 9.5h of daylight, December has the shortest days of the year in Louisville.

How many hours of daylight does Louisville have in December?

In December, the average length of the day in Louisville is 9.5h.

What is the month with the least sunshine in Louisville?

With an average of 3.8h of sunshine, December has the least sunshine of the year in Louisville.

How many hours of sunshine does Louisville have in December?

The average sunshine in December in Louisville is 3.8h.

When is the lowest UV index in Louisville?

Months with the lowest UV index in Louisville are January and December, with an average maximum UV index of 2.

What is the UV index intensity in December in Louisville?

In Louisville, the average daily maximum UV index in December is 2. A UV Index reading of 2, and below, represents a minimal hazard to health from the exposure to the Sun's UV rays.
Average temperature in December - Louisville, KY
  • Average high temperature in December: 45.8°F

The warmest month (with the highest average high temperature) is July (88.7°F).
The month with the lowest average high temperature is January (43°F).

  • Average low temperature in December: 30°F

The month with the highest average low temperature is July (69.9°F).
The coldest month (with the lowest average low temperature) is January (26.8°F).

Average humidity in December - Louisville, KY
  • Average humidity in December: 70.2%

The month with the highest relative humidity is September (72.9%).
The month with the lowest relative humidity is April (61.5%).

Average rainfall in December - Louisville, KY
  • Average rainfall in December: 3.8"

The wettest month (with the highest rainfall) is May (5.3").
The driest month (with the lowest rainfall) is September (3.1").

Average rainfall days in December - Louisville, KY
  • Average rainfall days in December: 12 days

The month with the highest number of rainy days is May (12.6 days).
The month with the lowest number of rainy days is October (7.7 days).

Average snowfall in December - Louisville, KY
  • Average snowfall in December: 2.6"

The month with the highest snowfall is February (4.5").
Months with the lowest snowfall are May, June, July, August and September (0").

Average snowfall days in December - Louisville, KY
  • Average snowfall days in December: 2.9 days

Months with the highest number of snowfall days are January and February (3.6 days).
Months with the lowest number of snowfall days are May, June, July, August and September (0 days).

Average daylight in December / Average sunshine in December - Louisville, KY
  • Average daylight in December: 9.5h

The month with the longest days is June (Average daylight: 14.8h).
The month with shortest days is December (Average daylight: 9.5h).

  • Average sunshine in December: 3.8h

The month with most sunshine is June (Average sunshine: 9.6h).
The month with least sunshine is December (Average sunshine: 3.8h).

Average UV index in December - Louisville, KY
  • Average UV index in December: 2

Months with the highest UV index are June, July and August (UV index 9).
Months with the lowest UV index are January and December (UV index 2).