Average Weather in December in Fort Smith Arkansas, United States
Daily high temperatures decrease by 7°F, from 57°F to 50°F, rarely falling below 35°F or exceeding 71°F.
Daily low temperatures decrease by 6°F, from 38°F to 31°F, rarely falling below 18°F or exceeding 50°F.
For reference, on July 26, the hottest day of the year, temperatures in Fort Smith typically range from 73°F to 94°F, while on January 7, the coldest day of the year, they range from 31°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
’Aïn el Bell, Algeria (5,275 miles away); Kafr Takhārīm, Syria (6,582 miles); and Shahrisabz, Uzbekistan (7,163 miles) are the far-away foreign places with temperatures most similar to Fort Smith (view comparison).
The month of December in Fort Smith experiences essentially constant cloud cover, with the percentage of time that the sky is overcast or mostly cloudy remaining about 46% throughout the month. The highest chance of overcast or mostly cloudy conditions is 48% on December 27.
The clearest day of the month is December 1, with clear, mostly clear, or partly cloudy conditions 56% of the time.
For reference, on February 16, the cloudiest day of the year, the chance of overcast or mostly cloudy conditions is 48%, while on October 5, 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 Fort Smith, the chance of a wet day over the course of December is decreasing, starting the month at 23% and ending it at 18%.
For reference, the year's highest daily chance of a wet day is 43% on May 21, and its lowest chance is 17% on January 12.
Over the course of December in Fort Smith, the chance of a day with only rain decreases from 22% to 15%, 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 1% throughout.
Probability of Precipitation in December
The average sliding 31-day rainfall during December in Fort Smith is rapidly decreasing, starting the month at 3.6 inches, when it rarely exceeds 7.2 inches or falls below 0.7 inches, and ending the month at 2.6 inches, when it rarely exceeds 6.0 inches or falls below 0.5 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 Fort Smith 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 Fort Smith, the length of the day is essentially constant. The shortest day of the month is December 21, with 9 hours, 46 minutes of daylight and the longest day is December 1, with 9 hours, 57 minutes of daylight.
Hours of Daylight and Twilight in December
The earliest sunrise of the month in Fort Smith is 7:08 AM on December 1 and the latest sunrise is 18 minutes later at 7:26 AM on December 31.
The earliest sunset is 5:04 PM on December 5 and the latest sunset is 10 minutes later at 5:15 PM on December 31.
Daylight saving time is observed in Fort Smith 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 6:02 AM and sets 14 hours, 33 minutes later, at 8:35 PM, while on December 21, the shortest day of the year, it rises at 7:22 AM and sets 9 hours, 46 minutes later, at 5:08 PM.
Sunrise & Sunset with Twilight and Daylight Saving Time in December
The chance that a given day will be muggy in Fort Smith is essentially constant during December, remaining around 0% throughout.
For reference, on July 22, the muggiest day of the year, there are muggy conditions 85% of the time, while on January 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 Fort Smith is essentially constant during December, remaining within 0.1 miles per hour of 6.7 miles per hour throughout.
For reference, on April 1, the windiest day of the year, the daily average wind speed is 7.9 miles per hour, while on August 3, the calmest day of the year, the daily average wind speed is 4.8 miles per hour.
Average Wind Speed in December
Wind Direction in December
The growing season in Fort Smith typically lasts for 7.5 months (230 days), from around March 24 to around November 9, rarely starting before March 2 or after April 15, and rarely ending before October 21 or after November 29.
The month of December in Fort Smith is very likely fully outside of the growing season, with the chance that a given day is in the growing season gradually decreasing from 8% to 0% over the course of the month.
Time Spent in Various Temperature Bands and the Growing Season in December
The average accumulated growing degree days in Fort Smith are gradually increasing during December, increasing by 58°F, from 5,202°F to 5,260°F, over the course of the month.
Growing Degree Days in December
The average daily incident shortwave solar energy in Fort Smith is essentially constant during December, remaining within 0.1 kWh of 2.6 kWh throughout.
The lowest average daily incident shortwave solar energy during December is 2.4 kWh on December 23.
Average Daily Incident Shortwave Solar Energy in December
For the purposes of this report, the geographical coordinates of Fort Smith are 35.386 deg latitude, -94.399 deg longitude, and 436 ft elevation.
The topography within 2 miles of Fort Smith contains only modest variations in elevation, with a maximum elevation change of 233 feet and an average elevation above sea level of 459 feet. Within 10 miles contains only modest variations in elevation (748 feet). Within 50 miles contains significant variations in elevation (2,418 feet).
The area within 2 miles of Fort Smith is covered by artificial surfaces (100%), within 10 miles by cropland (47%) and artificial surfaces (26%), and within 50 miles by trees (57%) and cropland (37%).
This report illustrates the typical weather in Fort Smith 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 Fort Smith.
For each station, the records are corrected for the elevation difference between that station and Fort Smith 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 Fort Smith is computed as the weighted average of the individual contributions from each station, with weights proportional to the inverse of the distance between Fort Smith and a given station.
The stations contributing to this reconstruction are: Fort Smith Municipal Airport (91%, 7 kilometers, southeast); Sallisaw Municipal Airport (7%, 37 kilometers, west); and Drake Field (2.4%, 73 kilometers, north).
Time zones for aiports and weather stations are provided by AskGeo.com .