Contents
- Weather in December
- Frequently asked questions
- Average temperature in December
- Average pressure in December
- Average wind speed in December
- Average humidity in December
- Average rainfall in December
- Average rainfall days in December
- Average snowfall in December
- Average snowfall days in December
- Average daylight in December
- Average sunshine in December
- Average sunshine days in December
- Average UV index in December
- Average cloud cover in December
- Average visibility in December
Weather in December
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.
Published by: Weather U.S. | About Us
Data Sources | Weather Forecasting & Climate
Frequently asked questions
Is it cold in Old Saint Louis during December?
What is the most humid month in Old Saint Louis?
What is the average humidity in December in Old Saint Louis?
How much does it rain in Old Saint Louis in December?
How much does it snow in Old Saint Louis in December?
What is the month with the shortest days in Old Saint Louis?
How many hours of daylight does Old Saint Louis have in December?
When are sunrise and sunset in December in Old Saint Louis?
How long on average sun shines in December in Old Saint Louis?
When is the lowest UV index in Old Saint Louis?
What is the UV index reading in December in Old Saint Louis?
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: 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: 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: 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: 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: 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: 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: 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: 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: 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: 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: 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: 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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