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
Saint Augustine, Illinois, experiences a temperature shift at the start of December, with average high-temperatures adjusting from a frosty 47.5°F (8.6°C) in November to a cold 35.8°F (2.1°C). In Saint Augustine, December nights witness a steady temperature drop to a freezing cold 25°F (-3.9°C).Humidity
In Saint Augustine, the average relative humidity in December is 81%.Rainfall
The months with the least rainfall in Saint Augustine are January and December Rain falls for 6.8 days and accumulates 0.59" (15mm) of rain.Snowfall
Months with snowfall in Saint Augustine are January through April, October through December. In Saint Augustine, Illinois, in December, during 7.1 snowfall days, 0.75" (19mm) of snow is typically accumulated. In Saint Augustine, during the entire year, snow falls for 32.2 days and aggregates up to 4.8" (122mm) of snow.Daylight
The month with the shortest days in Saint Augustine, Illinois, is December, with an average of 9h and 18min of daylight.On the first day of December, sunrise is at 7:06 am and sunset at 4:34 pm. On the last day of the month, sunrise is at 7:25 am and sunset at 4:44 pm CST.
Sunshine
The average sunshine in December is 4.5h.UV index
The months with the lowest UV index in Saint Augustine are January, February, November and 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 rays for average individuals.Note: The maximum UV index of 2 during December translates into these guidelines:
Many can withstand an hour in the sun without burning, yet children must always have protection against sunlight. It's crucial to reduce time in the direct Sun around mid-day due to the intense solar radiation. A wide-brimmed hat provides unparalleled sun protection for sensitive areas like the eyes, ears, and neck. Foresee this! The reflection from snow can nearly double the intensity of UV radiation from the Sun.
Frequently asked questions
How cold is December in Saint Augustine?
What is the average humidity in December in Saint Augustine?
What is the driest month in Saint Augustine?
How much does it rain in Saint Augustine in December?
How much does it snow in Saint Augustine in December?
What is the month with the shortest days in Saint Augustine?
How many hours of daylight does Saint Augustine have in December?
What time are sunrise and sunset in December in Saint Augustine?
How long on average sun shines in December in Saint Augustine?
What is the month with the lowest UV index in Saint Augustine?
What is the UV index intensity in December in Saint Augustine?
Average temperature in December
Saint Augustine, IL
- Average high temperature in December: 35.8°F
The warmest month (with the highest average high temperature) is July (82°F).
The month with the lowest average high temperature is January (29.8°F).
- Average low temperature in December: 25°F
The month with the highest average low temperature is July (64.9°F).
The coldest month (with the lowest average low temperature) is January (17.8°F).
Average pressure in December
Saint Augustine, IL
- Average pressure in December: 30.11"Hg
The month with the highest atmospheric pressure is January (30.14"Hg).
The month with the lowest atmospheric pressure is June (29.91"Hg).
Average wind speed in December
Saint Augustine, IL
- Average wind speed in December: 9.9mph
The windiest month (with the highest average wind speed) is April (10.7mph).
The calmest month (with the lowest average wind speed) is August (6.6mph).
Average humidity in December
Saint Augustine, IL
- Average humidity in December: 81%
The month with the highest relative humidity is July (84%).
The month with the lowest relative humidity is October (72%).
Average rainfall in December
Saint Augustine, IL
- Average rainfall in December: 0.59"
The wettest month (with the highest rainfall) is May (2.2").
The driest months (with the least rainfall) are January and December (0.59").
Average rainfall days in December
Saint Augustine, IL
- Average rainfall days in December: 6.8 days
The month with the highest number of rainy days is May (16.3 days).
The month with the least rainy days is February (4.4 days).
Average snowfall in December
Saint Augustine, IL
- Average snowfall in December: 0.75"
The month with the highest snowfall is January (1.26").
The months with the least snowfall are May, June, July, August and September (0").
Average snowfall days in December
Saint Augustine, IL
- Average snowfall days in December: 7.1 days
The month with the highest number of snowfall days is January (10.3 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
Saint Augustine, IL
- Average daylight in December: 9h and 2min
The month with the longest days is June (Average daylight: 15h and 0min).
The month with the shortest days is December (Average daylight: 9h and 18min).
- Average sunshine in December: 4h and 3min
The months with the most sunshine are June and July (Average sunshine: 10h and 6min).
The month with the least sunshine is January (Average sunshine: 4h and 6min).
Average sunshine days in December
Saint Augustine, IL
- Average sunshine days in December: 18.1 days
The month with the most sunshine days is November (19.6 days).
The month with the least sunshine days is July (11.2 days).
Average UV index in December
Saint Augustine, IL
- 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
Saint Augustine, IL
- Average cloud cover in December: 53
The month with the most cloud cover is January (Cloud cover 57).
The month with the least cloud cover is September (Cloud cover 29).
Average visibility in December
Saint Augustine, IL
- Average visibility in December: 6mi
The months with the highest visibility are January, February, March, April, May, June, August, September, October, November and December (6mi).
The month with the lowest visibility is July (5mi).
Saint Augustine, Illinois, USA
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