Average Weather in December in Carterville Missouri, United States
Daily high temperatures decrease by 8°F, from 52°F to 45°F, rarely falling below 29°F or exceeding 67°F.
Daily low temperatures decrease by 7°F, from 35°F to 27°F, rarely falling below 11°F or exceeding 50°F.
For reference, on July 23, the hottest day of the year, temperatures in Carterville typically range from 71°F to 91°F, while on January 6, the coldest day of the year, they range from 27°F to 45°F.
Average High and Low Temperature in December
The figure below shows you a compact characterization of the hourly average temperatures for the quarter of the year centered on December. The horizontal axis is the day, the vertical axis is the hour of the day, and the color is the average temperature for that hour and day.
Average Hourly Temperature in December
The month of December in Carterville experiences essentially constant cloud cover, with the percentage of time that the sky is overcast or mostly cloudy remaining about 47% throughout the month. The highest chance of overcast or mostly cloudy conditions is 49% on December 27.
The clearest day of the month is December 1, with clear, mostly clear, or partly cloudy conditions 55% of the time.
For reference, on February 12, the cloudiest day of the year, the chance of overcast or mostly cloudy conditions is 50%, while on August 27, the clearest day of the year, the chance of clear, mostly clear, or partly cloudy skies is 71%.
Cloud Cover Categories in December
A wet day is one with at least 0.04 inches of liquid or liquid-equivalent precipitation. In Carterville, the chance of a wet day over the course of December is decreasing, starting the month at 20% and ending it at 15%.
For reference, the year's highest daily chance of a wet day is 45% on June 4, and its lowest chance is 13% on January 12.
Over the course of December in Carterville, the chance of a day with only rain decreases from 17% to 10%, the chance of a day with mixed snow and rain remains an essentially constant 2% throughout, and the chance of a day with only snow remains an essentially constant 1% throughout.
Probability of Precipitation in December
The average sliding 31-day rainfall during December in Carterville is decreasing, starting the month at 2.6 inches, when it rarely exceeds 5.9 inches or falls below 0.4 inches, and ending the month at 1.6 inches, when it rarely exceeds 4.1 inches or falls below 0.2 inches.
Average Monthly Rainfall in December
We report snowfall in liquid-equivalent terms. The actual depth of new snowfall is typically between 5 and 10 times the liquid-equivalent amount, assuming the ground is frozen. As with rainfall, we consider the liquid-equivalent snowfall accumulated over a sliding 31-day period centered around each day.
The average sliding 31-day liquid-equivalent snowfall during December in Carterville is essentially constant, remaining about 0.2 inches throughout, and rarely exceeding 0.9 inches or falling to 0.0 inches.
Average Monthly Liquid-Equivalent Snowfall in December
Over the course of December in Carterville, the length of the day is essentially constant. The shortest day of the month is December 21, with 9 hours, 36 minutes of daylight and the longest day is December 1, with 9 hours, 48 minutes of daylight.
Hours of Daylight and Twilight in December
The earliest sunrise of the month in Carterville is 7:12 AM on December 1 and the latest sunrise is 19 minutes later at 7:31 AM on December 31.
The earliest sunset is 5:00 PM on December 6 and the latest sunset is 10 minutes later at 5:10 PM on December 31.
Daylight saving time is observed in Carterville during 2018, but it neither starts nor ends during December, so the entire month is in standard time.
For reference, on June 21, the longest day of the year, the Sun rises at 5:58 AM and sets 14 hours, 43 minutes later, at 8:41 PM, while on December 21, the shortest day of the year, it rises at 7:27 AM and sets 9 hours, 36 minutes later, at 5:04 PM.
Sunrise & Sunset with Twilight and Daylight Saving Time in December
The chance that a given day will be muggy in Carterville is essentially constant during December, remaining around 0% throughout.
The lowest chance of a muggy day during December is 0% on December 22.
For reference, on July 23, the muggiest day of the year, there are muggy conditions 74% of the time, while on December 12, the least muggy day of the year, there are muggy conditions 0% of the time.
Humidity Comfort Levels in December
The average hourly wind speed in Carterville is essentially constant during December, remaining within 0.1 miles per hour of 10.3 miles per hour throughout.
For reference, on April 1, the windiest day of the year, the daily average wind speed is 11.9 miles per hour, while on August 3, the calmest day of the year, the daily average wind speed is 7.4 miles per hour.
The lowest daily average wind speed during December is 10.2 miles per hour on December 19.
Average Wind Speed in December
Wind Direction in December
The growing season in Carterville typically lasts for 6.7 months (207 days), from around April 5 to around October 29, rarely starting before March 18 or after April 22, and rarely ending before October 8 or after November 16.
The month of December in Carterville is reliably fully outside of the growing season.
Time Spent in Various Temperature Bands and the Growing Season in December
The average accumulated growing degree days in Carterville are gradually increasing during December, increasing by 40°F, from 4,608°F to 4,648°F, over the course of the month.
Growing Degree Days in December
The average daily incident shortwave solar energy in Carterville is essentially constant during December, remaining within 0.1 kWh of 2.4 kWh throughout.
The lowest average daily incident shortwave solar energy during December is 2.3 kWh on December 20.
Average Daily Incident Shortwave Solar Energy in December
For the purposes of this report, the geographical coordinates of Carterville are 37.149 deg latitude, -94.443 deg longitude, and 981 ft elevation.
The topography within 2 miles of Carterville contains only modest variations in elevation, with a maximum elevation change of 190 feet and an average elevation above sea level of 983 feet. Within 10 miles also contains only modest variations in elevation (384 feet). Within 50 miles contains only modest variations in elevation (925 feet).
The area within 2 miles of Carterville is covered by artificial surfaces (45%), trees (21%), cropland (20%), and grassland (11%), within 10 miles by cropland (59%) and trees (23%), and within 50 miles by cropland (75%) and trees (20%).
This report illustrates the typical weather in Carterville year round, based on a statistical analysis of historical hourly weather reports and model reconstructions from January 1, 1980 to December 31, 2016.
Temperature and Dew Point
There are 2 weather stations near enough to contribute to our estimation of the temperature and dew point in Carterville.
For each station, the records are corrected for the elevation difference between that station and Carterville according to the International Standard Atmosphere , and by the relative change present in the MERRA-2 satellite-era reanalysis between the two locations.
The estimated value at Carterville is computed as the weighted average of the individual contributions from each station, with weights proportional to the inverse of the distance between Carterville and a given station.
All other weather data, including cloud cover, precipitation, wind speed and direction, and solar flux, come from NASA's MERRA-2 Modern-Era Retrospective Analysis . This reanalysis combines a variety of wide-area measurements in a state-of-the-art global meteorological model to reconstruct the hourly history of weather throughout the world on a 50-kilometer grid.
Time zones for aiports and weather stations are provided by AskGeo.com .