December weather forecast
Old Saint Louis, IN

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Weather in December

The first month of the winter, December, is also an icy month in Old Saint Louis, Indiana, with temperature in the range of an average low of 29.7°F (-1.3°C) and an average high of 40.6°F (4.8°C).

Temperature

December's arrival correlates with a reduction in the average high-temperature, down from a fresh 51.1°F (10.6°C) in November to a wintry 40.6°F (4.8°C). An average low-temperature of 29.7°F (-1.3°C) is observed during the December nights.

Humidity

January, February, July and December, with an average relative humidity of 81%, are the most humid months in Old Saint Louis.

Rainfall

In December, in Old Saint Louis, the rain falls for 11.7 days. Throughout December, 2.24" (57mm) of precipitation is accumulated. In Old Saint Louis, during the entire year, the rain falls for 163.5 days and collects up to 29.29" (744mm) of precipitation.

Snowfall

January through April, November and December are months with snowfall in Old Saint Louis. In December, it is snowing for 8.2 days. Throughout December, 1.89" (48mm) of snow is accumulated. Throughout the year, in Old Saint Louis, there are 34.1 snowfall days, and 8.54" (217mm) of snow is accumulated.

Daylight

The month with the shortest days in Old Saint Louis is December, with an average of 9h and 30min of daylight.
On the first day of December, sunrise is at 7:44 am and sunset at 5:20 pm. On the last day of the month, sunrise is at 8:02 am and sunset at 5:30 pm EST.

Sunshine

In Old Saint Louis, the average sunshine in December is 4.3h.

UV index

January, February, November and December, with an average maximum UV index of 2, are months with the lowest UV index. A UV Index value of 2, and less, symbolizes a low health risk from exposure to the Sun's UV rays for average individuals.
Note: The maximum UV index of 2 during December leads to these instructions:
Despite the majority tolerating prolonged sun exposure, those with sensitive skin, infants, and children demand continual protection. Exposing oneself to the midday Sun can be harmful due to the strong UV radiation; limit your time outside. A wide-brimmed hat provides unparalleled sun protection for sensitive areas like the eyes, ears, and neck. Watch out! The Sun's UV radiation can be nearly magnified twofold due to snow reflection.
Updated: Feb 12, 2024
Published by: Weather U.S. | About Us
Data Sources | Weather Forecasting & Climate

Frequently asked questions

Is it cold in Old Saint Louis during December?

In Old Saint Louis, in December, the average high-temperature is 40.6°F (4.8°C), and the average low-temperature is 29.7°F (-1.3°C). The average heat index (a.k.a. 'felt air temperature', 'real feel'), which combines relative humidity and air temperature, in August is calculated to be 89.6°F (32°C).

What is the most humid month in Old Saint Louis?

The months with the highest humidity in Old Saint Louis are January, February, July and December, with an average relative humidity of 81%.

What is the average humidity in December in Old Saint Louis?

The average relative humidity in December in Old Saint Louis, Indiana, is 81%.

How much does it rain in Old Saint Louis in December?

In Old Saint Louis, during December, the rain falls for 11.7 days and regularly aggregates up to 2.24" (57mm) of precipitation.

How much does it snow in Old Saint Louis in December?

In Old Saint Louis, Indiana, in December, snow falls for 8.2 days, with typically accumulated 1.89" (48mm) of snow.

What is the month with the shortest days in Old Saint Louis?

The month with the shortest days in Old Saint Louis is December, with an average of 9h and 30min of daylight.

How many hours of daylight does Old Saint Louis have in December?

The average day length in December in Old Saint Louis is 9h and 27min.

When are sunrise and sunset in December in Old Saint Louis?

In December, on the first day of the month, sunrise is at 7:44 am and sunset at 5:20 pm. On the last day of the month, in Old Saint Louis, Indiana, sunrise is at 8:02 am and sunset at 5:30 pm EST.

How long on average sun shines in December in Old Saint Louis?

The average sunshine duration in December is 4.3h.

When is the lowest UV index in Old Saint Louis?

The months with the lowest UV index in Old Saint Louis, Indiana, are January, February, November and December, with an average maximum UV index of 2.

What is the UV index reading in December in Old Saint Louis?

In December, the average daily maximum UV index is 2. A UV Index reading of 2, and below, represents a minimal hazard to health from unsafe exposure to Sun's UV rays.
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
Old Saint Louis, IN

Average temperature in December - Old Saint Louis, IN
  • Average high temperature in December: 40.6°F

The warmest month (with the highest average high temperature) is July (83.3°F).
The month with the lowest average high temperature is January (35.2°F).

  • Average low temperature in December: 29.7°F

The month with the highest average low temperature is July (65.5°F).
The coldest month (with the lowest average low temperature) is January (22.5°F).

Average pressure in December
Old Saint Louis, IN

Average pressure in December - Old Saint Louis, 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
Old Saint Louis, IN

Average wind speed in December - Old Saint Louis, IN
  • Average wind speed in December: 8.2mph

The windiest months (with the highest average wind speed) are January and February (8.9mph).
The calmest months (with the lowest average wind speed) are July and August (5.3mph).

Average humidity in December
Old Saint Louis, IN

Average humidity in December - Old Saint Louis, IN
  • Average humidity in December: 81%

The months with the highest relative humidity are January, February, July and December (81%).
The month with the lowest relative humidity is October (74%).

Average rainfall in December
Old Saint Louis, IN

Average rainfall in December - Old Saint Louis, IN
  • Average rainfall in December: 2.24"

The wettest month (with the highest rainfall) is May (3.5").
The driest month (with the least rainfall) is September (1.73").

Average rainfall days in December
Old Saint Louis, IN

Average rainfall days in December - Old Saint Louis, IN
  • Average rainfall days in December: 11.7 days

The month with the highest number of rainy days is May (18.3 days).
The months with the least rainy days are January and February (9.4 days).

Average snowfall in December
Old Saint Louis, IN

Average snowfall in December - Old Saint Louis, IN
  • Average snowfall in December: 1.89"

The month with the highest snowfall is February (2.17").
The months with the least snowfall are May, June, July, August, September and October (0").

Average snowfall days in December
Old Saint Louis, IN

Average snowfall days in December - Old Saint Louis, IN
  • Average snowfall days in December: 8.2 days

The month with the highest number of snowfall days is January (9.6 days).
The months with the least snowfall days are May, June, July, August and September (0 days).

Average daylight in December /
Average sunshine in December
Old Saint Louis, IN

Average daylight in December / Average sunshine in December - Old Saint Louis, IN
  • Average daylight in December: 9h and 3min

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 30min).

  • Average sunshine in December: 4h and 2min

The month with the most sunshine is July (Average sunshine: 10h and 24min).
The month with the least sunshine is January (Average sunshine: 4h and 6min).

Average sunshine days in December
Old Saint Louis, IN

Average sunshine days in December - Old Saint Louis, IN
  • Average sunshine days in December: 13.6 days

The month with the most sunshine days is October (17.7 days).
The month with the least sunshine days is May (10.3 days).

Average UV index in December
Old Saint Louis, IN

Average UV index in December - Old Saint Louis, IN
  • Average UV index in December: 2

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

Average cloud cover in December
Old Saint Louis, IN

Average cloud cover in December - Old Saint Louis, IN
  • Average cloud cover in December: 55

The month with the most cloud cover is January (Cloud cover 58).
The month with the least cloud cover is August (Cloud cover 29).

Average visibility in December
Old Saint Louis, IN

Average visibility in December - Old Saint Louis, IN
  • Average visibility in December: 5mi

The months with the highest visibility are January, February, March, April, May, June, August, September, October and November (6mi).
The months with the lowest visibility are July and December (5mi).

Old Saint Louis, Indiana, USA

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