December weather forecast
Indianapolis, IN

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, the first month of the winter in Indianapolis, is still a cold month, with an average temperature fluctuating between 28.2°F (-2.1°C) and 38.3°F (3.5°C).

Temperature

In Indianapolis, the average high-temperature in December decreases from a chilly 49.3°F (9.6°C) in November to a wintry 38.3°F (3.5°C). In December, in Indianapolis, the average low-temperature is 28.2°F (-2.1°C).

Humidity

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

Rainfall

In December, in Indianapolis, Indiana, the rain falls for 8.9 days. Throughout December, 1.57" (40mm) of precipitation is accumulated. In Indianapolis, Indiana, during the entire year, the rain falls for 146.4 days and collects up to 21.14" (537mm) of precipitation.

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 is December, with an average of 9h and 25min of daylight.
On the first day of December in Indianapolis, sunrise is at 7:46 am and sunset at 5:20 pm. On the last day of the month, sunrise is at 8:05 am and sunset at 5:29 pm EST.

Sunshine

In December, the average sunshine in Indianapolis 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 value of 2, and less, symbolizes a minimal health hazard from unsafe exposure to UV radiation for average individuals.
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 Sun's most intense and consequently most harmful UV radiation during midday hours should be decreased by minimizing exposure and seeking shade. 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. Caution! The reflection of snow can nearly double the intensity of the Sun's UV radiation.
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FAQ

What is the most humid month in Indianapolis?

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

What is the average humidity in December in Indianapolis?

In Indianapolis, Indiana, the average relative humidity in December is 82%.

How much does it rain in Indianapolis in December?

In Indianapolis, in December, during 8.9 rainfall days, 1.57" (40mm) of precipitation is typically accumulated.

When does it snow the most in Indianapolis?

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

How many days does it snow in December in Indianapolis?

In December, it is snowing for 6.2 days. Throughout December, 2.28" (58mm) of snow is accumulated.

What is the month with the shortest days in Indianapolis?

The month with the shortest days is December, with an average of 9h and 25min of daylight.

What is the average length of the day in December in Indianapolis?

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

When are sunrise and sunset in December in Indianapolis?

On the first day of December in Indianapolis, Indiana, sunrise is at 7:46 am and sunset at 5:20 pm. On the last day of the month, sunrise is at 8:05 am and sunset at 5:29 pm EST.

How many hours of sunshine does Indianapolis have in December?

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

What are the months with the lowest UV index in Indianapolis?

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

How high is the UV index in December in Indianapolis?

In Indianapolis, Indiana, the average daily maximum UV index in December is 2. A UV Index reading of 2, and below, represents a low health risk 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).

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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).

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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).

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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%).

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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").

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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).

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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").

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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).

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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 25min

The month with the longest days is June (Average daylight: 14h and 56min).
The month with the shortest days is December (Average daylight: 9h and 25min).

  • Average sunshine in December: 4h and 12min

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).

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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).

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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).

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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).

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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).

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