December weather forecast
Indianapolis, IN

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The magnificent Monument Circle in Indianapolis, Indiana with the surrounding cityscape
The magnificent Monument Circle in Indianapolis, Indiana with the surrounding cityscape

Weather in December

December in Indianapolis can be described as a perfect winter wonderland with the landscape turning shades of white thanks to an average snowfall of 2.28" (58mm). The temperature hovers around a chilly 38.3°F (3.5°C), while the holiday lights twinkle across the cityscape. This season, coupled with the festive ambiance, turns the city into a beautifully frosted spectacle. Despite the freezing weather, Indianapolis’s December appeal is hard to resist.

Temperature

The average high-temperature decreases in December, shifting from a chilly 49.3°F (9.6°C) in November to an icy 38.3°F (3.5°C). During December, Indianapolis experiences an average low-temperature of 28.2°F (-2.1°C) at night.

Humidity

The most humid month is December, with an average relative humidity of 82%.

Rainfall

In Indianapolis, during December, the rain falls for 8.9 days and regularly aggregates up to 1.57" (40mm) of precipitation. Throughout the year, there are 146.4 rainfall days, and 21.14" (537mm) of precipitation is accumulated.

Snowfall

Months with snowfall are January through April, November and December. The month with the most snowfall is December, when snow falls for 6.2 days and typically aggregates up to 2.28" (58mm) of snow.

Daylight

The month with the shortest days in Indianapolis is December, with an average of 9h and 24min of daylight.
On the first day of the month, sunrise is at 7:47 am and sunset at 5:20 pm. On the last day of December, sunrise is at 8:05 am and sunset at 5:30 pm EST.

Sunshine

In Indianapolis, the average sunshine in December is 4.2h.

UV index

The months with the lowest UV index are January, February, October through December, with an average maximum UV index of 2. A UV Index estimate of 2, and below, represents a low threat to health from exposure to the Sun's UV radiation for average individuals.
Note: In December, an average UV index of 2 transforms into the following instructions:
People with sensitive skin, children, and babies should always be protected from prolonged sun exposure. Midday is the peak time for the Sun's radiation; stay in the shade and protect yourself. Sunglasses that ward off UVA and UVB rays play a pivotal role in reducing solar eye damage. Take warning! The intensity of the Sun's UV radiation can be nearly amplified twice due to snow reflection.

Frequently asked questions

How cold is it in December?

In Indianapolis, 38.3°F (3.5°C) is the average high-temperature and 28.2°F (-2.1°C) is the average low-temperature during December. The average heat index (a.k.a. 'feels like', 'real feel'), which factors the actual air temperature with the relative humidity, in August is computed to be 86°F (30°C).

What is the most humid month?

December is the most humid month in Indianapolis, with an average relative humidity of 82%.

What is the average humidity in December?

In December, the average relative humidity is 82%.

How much does it rain in December?

In Indianapolis, in December, it is raining for 8.9 days, with typically 1.57" (40mm) of accumulated precipitation.

When does it snow the most?

December is the month with the most snowfall. Snow falls for 6.2 days and accumulates 2.28" (58mm) of snow.

How much does it snow in Indianapolis in December?

In Indianapolis, in December, snow falls for 6.2 days, with typically accumulated 2.28" (58mm) of snow.

What is the month with the shortest days?

The month with the shortest days is December, with an average of 9h and 24min of daylight.

How many hours of daylight does Indianapolis have in December?

The average day length in December is 9h and 25min.

When are sunrise and sunset in December?

On the first day of December, sunrise is at 7:47 am and sunset at 5:20 pm. On the last day of the month, sunrise is at 8:05 am and sunset at 5:30 pm EST.

How many hours of sunshine does Indianapolis have in December?

In December, the average sunshine duration is 4.2h.

When is the lowest UV index?

The months with the lowest UV index are January, February, October through December, with an average maximum UV index of 2.

What is the UV index intensity in December?

The average daily maximum UV index in December in Indianapolis is 2. A UV Index of 2, and less, symbolizes a minimal health vulnerability from unprotected exposure to UV radiation.
Average humidity
Average rainfall days
Average snowfall days
Average daylight
Average sunshine
Average sunshine days
Average UV index
Average cloud cover
Average visibility

Average temperature in December
Indianapolis, IN

Average temperature in December - Indianapolis, IN
  • Average high temperature in December: 38.3°F

The warmest month (with the highest average high temperature) is July (82°F).
The month with the lowest average high temperature is January (33.4°F).

  • Average low temperature in December: 28.2°F

The month with the highest average low temperature is July (66.2°F).
The coldest month (with the lowest average low temperature) is January (21°F).

Average pressure in December
Indianapolis, IN

Average pressure in December - Indianapolis, IN
  • Average pressure in December: 30.12"Hg

The month with the highest atmospheric pressure is January (30.14"Hg).
The month with the lowest atmospheric pressure is June (29.93"Hg).

Average wind speed in December
Indianapolis, IN

Average wind speed in December - Indianapolis, IN
  • Average wind speed in December: 9mph

The windiest months (with the highest average wind speed) are January and February (9.8mph).
The calmest month (with the lowest average wind speed) is August (5.7mph).

Average humidity in December
Indianapolis, IN

Average humidity in December - Indianapolis, IN
  • Average humidity in December: 82%

The month with the highest relative humidity is December (82%).
The month with the lowest relative humidity is October (73%).

Average rainfall in December
Indianapolis, IN

Average rainfall in December - Indianapolis, IN
  • Average rainfall in December: 1.57"

The wettest month (with the highest rainfall) is May (2.68").
The driest month (with the least rainfall) is February (1.22").

Average rainfall days in December
Indianapolis, IN

Average rainfall days in December - Indianapolis, IN
  • Average rainfall days in December: 8.9 days

The month with the highest number of rainy days is May (17.6 days).
The month with the least rainy days is February (6.8 days).

Average snowfall in December
Indianapolis, IN

Average snowfall in December - Indianapolis, IN
  • Average snowfall in December: 2.28"

The month with the highest snowfall is December (2.28").
The months with the least snowfall are May, June, July, August, September and October (0").

Average snowfall days in December
Indianapolis, IN

Average snowfall days in December - Indianapolis, IN
  • Average snowfall days in December: 6.2 days

The month with the highest number of snowfall days is January (7.9 days).
The months with the least snowfall days are June, July, August and September (0 days).

Average daylight in December /
Average sunshine in December
Indianapolis, IN

Average daylight in December / Average sunshine in December - Indianapolis, IN
  • Average daylight in December: 9h and 2min

The month with the longest days is June (Average daylight: 14h and 54min).
The month with the shortest days is December (Average daylight: 9h and 24min).

  • Average sunshine in December: 4h and 1min

The month with the most sunshine is July (Average sunshine: 10h and 18min).
The month with the least sunshine is January (Average sunshine: 4h and 6min).

Average sunshine days in December
Indianapolis, IN

Average sunshine days in December - Indianapolis, IN
  • Average sunshine days in December: 17 days

The month with the most sunshine days is October (18.6 days).
The month with the least sunshine days is May (11.1 days).

Average UV index in December
Indianapolis, IN

Average UV index in December - Indianapolis, IN
  • Average UV index in December: 2

The months with the highest UV index are May, June, July and August (UV index 6).
The months with the lowest UV index are January, February, October, November and December (UV index 2).

Average cloud cover in December
Indianapolis, IN

Average cloud cover in December - Indianapolis, IN
  • Average cloud cover in December: 56

The month with the most cloud cover is January (Cloud cover 59).
The month with the least cloud cover is August (Cloud cover 29).

Average visibility in December
Indianapolis, IN

Average visibility in December - Indianapolis, IN
  • Average visibility in December: 6mi

The months with the highest visibility are January, February, March, April, May, June, July, August, September, October, November and December (6mi).
The months with the lowest visibility are January, February, March, April, May, June, July, August, September, October, November and December (6mi).

Indianapolis, Indiana, USA

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