Average Weather in December in Lookout Mountain Tennessee, United States
In Lookout Mountain, the month of December is characterized by falling daily high temperatures, with daily highs decreasing by 6°F, from 57°F to 50°F over the course of the month, and rarely exceeding 68°F or dropping below 37°F.
Daily low temperatures decrease by 4°F, from 39°F to 34°F, rarely falling below 21°F or exceeding 53°F.
For reference, on July 22, the hottest day of the year, temperatures in Lookout Mountain typically range from 71°F to 89°F, while on January 26, the coldest day of the year, they range from 32°F to 50°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 Lookout Mountain experiences gradually increasing cloud cover, with the percentage of time that the sky is overcast or mostly cloudy increasing from 49% to 55%.
The clearest day of the month is December 1, with clear, mostly clear, or partly cloudy conditions 51% of the time.
For reference, on January 3, the cloudiest day of the year, the chance of overcast or mostly cloudy conditions is 56%, while on September 20, the clearest day of the year, the chance of clear, mostly clear, or partly cloudy skies is 67%.
Cloud Cover in December
A wet day is one with at least 0.04 inches of liquid or liquid-equivalent precipitation. In Lookout Mountain, the chance of a wet day over the course of December is essentially constant, remaining around 30% throughout.
For reference, the year's highest daily chance of a wet day is 43% on July 9, and its lowest chance is 20% on October 16.
Over the course of December in Lookout Mountain, the chance of a day with only rain remains an essentially constant 29% throughout, the chance of a day with mixed snow and rain remains an essentially constant 1% throughout, and the chance of a day with only snow remains an essentially constant 0% throughout.
Probability of Precipitation in December
The average sliding 31-day rainfall during December in Lookout Mountain is decreasing, starting the month at 4.9 inches, when it rarely exceeds 8.5 inches or falls below 2.1 inches, and ending the month at 4.3 inches, when it rarely exceeds 7.5 inches or falls below 1.9 inches.
The highest average 31-day accumulation is 4.9 inches on December 2.
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 Lookout Mountain is essentially constant, remaining about 0.1 inches throughout, and rarely exceeding 0.4 inches or falling below -0.0 inches.
Average Monthly Liquid-Equivalent Snowfall in December
Over the course of December in Lookout Mountain, the length of the day is essentially constant. The shortest day of the month is December 20, with 9 hours, 48 minutes of daylight and the longest day is December 1, with 9 hours, 59 minutes of daylight.
Hours of Daylight and Twilight in December
The earliest sunrise of the month in Lookout Mountain is 7:31 AM on December 1 and the latest sunrise is 18 minutes later at 7:49 AM on December 31.
The earliest sunset is 5:29 PM on December 5 and the latest sunset is 11 minutes later at 5:40 PM on December 31.
Daylight saving time is observed in Lookout Mountain during 2017, 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 6:27 AM and sets 14 hours, 31 minutes later, at 8:58 PM, while on December 21, the shortest day of the year, it rises at 7:45 AM and sets 9 hours, 48 minutes later, at 5:33 PM.
Sunrise & Sunset with Twilight and Daylight Saving Time in December
The chance that a given day will be muggy in Lookout Mountain is essentially constant during December, remaining around 0% throughout.
For reference, on July 24, the muggiest day of the year, there are muggy conditions 85% of the time, while on January 23, 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 Lookout Mountain is essentially constant during December, remaining within 0.1 miles per hour of 2.7 miles per hour throughout.
For reference, on February 26, the windiest day of the year, the daily average wind speed is 3.0 miles per hour, while on August 1, the calmest day of the year, the daily average wind speed is 1.8 miles per hour.
Average Wind Speed in December
Wind Direction in December
The average daily incident shortwave solar energy in Lookout Mountain is essentially constant during December, remaining within 0.1 kWh of 2.5 kWh throughout.
The lowest average daily incident shortwave solar energy during December is 2.4 kWh on December 25.
Average Daily Incident Shortwave Solar Energy in December
For the purposes of this report, the geographical coordinates of Lookout Mountain are 34.994 deg latitude, -85.349 deg longitude, and 722 ft elevation.
The topography within 2 miles of Lookout Mountain contains very significant variations in elevation, with a maximum elevation change of 1,509 feet and an average elevation above sea level of 1,154 feet. Within 10 miles also contains very significant variations in elevation (1,841 feet). Within 50 miles contains very significant variations in elevation (3,671 feet).
The area within 2 miles of Lookout Mountain is covered by trees (85%) and artificial surfaces (12%), within 10 miles by trees (62%) and artificial surfaces (27%), and within 50 miles by trees (67%) and cropland (27%).
This report illustrates the typical weather in Lookout Mountain 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 3 weather stations near enough to contribute to our estimation of the temperature and dew point in Lookout Mountain.
For each station, the records are corrected for the elevation difference between that station and Lookout Mountain 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 Lookout Mountain is computed as the weighted average of the individual contributions from each station, with weights proportional to the inverse of the distance between Lookout Mountain and a given station.
The stations contributing to this reconstruction are: Lovell Field (84%, 14 kilometers, east); Isbell Field (8%, 67 kilometers, southwest); and Scottsboro Municipal Airport Word Field (8%, 69 kilometers, southwest).
Time zones for aiports and weather stations are provided by AskGeo.com .