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Average Weather at Fort Smith Municipal Airport Arkansas, United States

At Fort Smith Municipal Airport, the summers are hot and muggy; the winters are short, very cold, and wet; and it is partly cloudy year round. Over the course of the year, the temperature typically varies from 31°F to 94°F and is rarely below 18°F or above 101°F.

Climate Summary

coldcoolwarmhotwarmcoolcoldJanFebMarAprMayJunJulAugSepOctNovDec71%71%52%52%clearovercastprecipitation: 5.3 inprecipitation: 5.3 in2.4 in2.4 inmuggy: 85%muggy: 85%0%0%drydrybeach/pool score: 6.3beach/pool score: 6.30.10.1
Click on each chart for more information.

Based on the beach/pool score, the best time of year to visit Fort Smith Municipal Airport for hot-weather activities is from mid June to early September.

Temperature

The hot season lasts for 3.5 months, from June 3 to September 18, with an average daily high temperature above 85°F. The hottest day of the year is July 24, with an average high of 94°F and low of 73°F.

The cold season lasts for 2.9 months, from November 27 to February 23, with an average daily high temperature below 58°F. The coldest day of the year is January 7, with an average low of 31°F and high of 50°F.

Average High and Low Temperature

The daily average high (red line) and low (blue line) temperature, with 25th to 75th and 10th to 90th percentile bands. The thin dotted lines are the corresponding average perceived temperatures.

The figure below shows you a compact characterization of the entire year of hourly average temperatures. The horizontal axis is the day of the year, the vertical axis is the hour of the day, and the color is the average temperature for that hour and day.

Average Hourly Temperature

Average Hourly Temperature at Fort Smith Municipal AirportJanFebMarAprMayJunJulAugSepOctNovDec12 AM4 AM8 AM12 PM4 PM8 PM12 AMvery coldvery coldvery coldcoldcoldcoolcoolcomfortablewarmwarmhotvery cold
The average hourly temperature, color coded into bands: frigid < 15°F < freezing < 32°F < very cold < 45°F < cold < 55°F < cool < 65°F < comfortable < 75°F < warm < 85°F < hot < 95°F < sweltering. The shaded overlays indicate night and civil twilight.

’Aïn el Bell, Algeria (5,276 miles away); Kafr Takhārīm, Syria (6,584 miles); and Shahrisabz, Uzbekistan (7,166 miles) are the far-away foreign places with temperatures most similar to Fort Smith Municipal Airport (view comparison).

Clouds

At Fort Smith Municipal Airport, the average percentage of the sky covered by clouds experiences mild seasonal variation over the course of the year.

The clearer part of the year at Fort Smith Municipal Airport begins around June 11 and lasts for 4.9 months, ending around November 7. On October 5, the clearest day of the year, the sky is clear, mostly clear, or partly cloudy 71% of the time, and overcast or mostly cloudy 29% of the time.

The cloudier part of the year begins around November 7 and lasts for 7.1 months, ending around June 11. On February 16, the cloudiest day of the year, the sky is overcast or mostly cloudy 48% of the time, and clear, mostly clear, or partly cloudy 52% of the time.

Cloud Cover Categories

Cloud Cover Categories at Fort Smith Municipal AirportclearercloudiercloudierJanFebMarAprMayJunJulAugSepOctNovDec0%100%10%90%20%80%30%70%40%60%50%50%60%40%70%30%80%20%90%10%100%0%Oct 571%Oct 571%Feb 1652%Feb 1652%Jun 1161%Jun 1161%Nov 762%Nov 762%clearmostly clearpartly cloudymostly cloudyovercast
The percentage of time spent in each cloud cover band, categorized by the percentage of the sky covered by clouds: clear < 20% < mostly clear < 40% < partly cloudy < 60% < mostly cloudy < 80% < overcast.

Precipitation

A wet day is one with at least 0.04 inches of liquid or liquid-equivalent precipitation. The chance of wet days at Fort Smith Municipal Airport varies throughout the year.

The wetter season lasts 2.9 months, from April 6 to July 2, with a greater than 31% chance of a given day being a wet day. The chance of a wet day peaks at 44% on May 21.

The drier season lasts 9.1 months, from July 2 to April 6. The smallest chance of a wet day is 18% on January 12.

Among wet days, we distinguish between those that experience rain alone, snow alone, or a mixture of the two. Based on this categorization, the most common form of precipitation throughout the year is rain alone, with a peak probability of 44% on May 21.

Daily Chance of Precipitation

Daily Chance of Precipitation at Fort Smith Municipal AirportwetdrydryJanFebMarAprMayJunJulAugSepOctNovDec0%10%20%30%40%50%60%70%80%90%100%May 2144%May 2144%Jan 1218%Jan 1218%Jan 118%Jan 118%Apr 631%Apr 631%Jul 231%Jul 231%rainmixed
The percentage of days in which various types of precipitation are observed, excluding trace quantities: rain alone, snow alone, and mixed (both rain and snow fell in the same day).

Rainfall

To show variation within the months and not just the monthly totals, we show the rainfall accumulated over a sliding 31-day period centered around each day of the year. Fort Smith Municipal Airport experiences significant seasonal variation in monthly rainfall.

Rain falls throughout the year at Fort Smith Municipal Airport. The most rain falls during the 31 days centered around May 10, with an average total accumulation of 5.3 inches.

The least rain falls around January 21, with an average total accumulation of 2.2 inches.

Average Monthly Rainfall

The average rainfall (solid line) accumulated over the course of a sliding 31-day period centered on the day in question, with 25th to 75th and 10th to 90th percentile bands. The thin dotted line is the corresponding average liquid-equivalent snowfall.

Snowfall

The sliding 31-day liquid-equivalent quantity of snowfall at Fort Smith Municipal Airport does not vary significantly over the course of the year, staying within 0.1 inches of 0.1 inches throughout.

Average Liquid-Equivalent Monthly Snowfall

Average Liquid-Equivalent Monthly Snowfall at Fort Smith Municipal AirportsnowJanFebMarAprMayJunJulAugSepOctNovDec0 in1 in2 in3 in4 in5 in6 inFeb 40.2 inFeb 40.2 inJul 250.0 inJul 250.0 inDec 90.1 inDec 90.1 inMar 70.1 inMar 70.1 in
The average liquid-equivalent snowfall (solid line) accumulated over the course of a sliding 31-day period centered on the day in question, with 25th to 75th and 10th to 90th percentile bands. The thin dotted line is the corresponding average rainfall.

Sun

The length of the day at Fort Smith Municipal Airport varies significantly over the course of the year. In 2017, the shortest day is December 21, with 9 hours, 46 minutes of daylight; the longest day is June 20, with 14 hours, 33 minutes of daylight.

Hours of Daylight and Twilight

Hours of Daylight and Twilight at Fort Smith Municipal AirportJanFebMarAprMayJunJulAugSepOctNovDec0 hr24 hr4 hr20 hr8 hr16 hr12 hr12 hr16 hr8 hr20 hr4 hr24 hr0 hr12 hr, 7 minMar 2012 hr, 7 minMar 2014 hr, 33 minJun 2014 hr, 33 minJun 2012 hr, 8 minSep 2212 hr, 8 minSep 229 hr, 46 minDec 219 hr, 46 minDec 21nightnightday
The number of hours during which the Sun is visible (black line). From bottom (most yellow) to top (most gray), the color bands indicate: full daylight, twilight (civil, nautical, and astronomical), and full night.

The earliest sunrise is at 6:02 AM on June 12, and the latest sunrise is 1 hour, 40 minutes later at 7:42 AM on November 4. The earliest sunset is at 5:04 PM on December 5, and the latest sunset is 3 hours, 32 minutes later at 8:36 PM on June 28.

Daylight saving time (DST) is observed at Fort Smith Municipal Airport during 2017, starting in the spring on March 12, lasting 7.8 months, and ending in the fall on November 5.

Sunrise & Sunset with Twilight and Daylight Saving Time

Sunrise & Sunset with Twilight and Daylight Saving Time at Fort Smith Municipal AirportJanFebMarAprMayJunJulAugSepOctNovDec2 AM4 AM6 AM8 AM10 AM12 PM2 PM4 PM6 PM8 PM10 PM12 AMJun 126:02 AMJun 126:02 AM8:36 PMJun 288:36 PMJun 28Dec 55:04 PMDec 55:04 PM7:42 AMNov 47:42 AMNov 4Mar 12DSTMar 12DSTDSTNov 5DSTNov 5daynightnightnightnightSolarMidnightSolarMidnightSolarNoonSunriseSunset
The solar day over the course of the year 2017. From bottom to top, the black lines are the previous solar midnight, sunrise, solar noon, sunset, and the next solar midnight. The day, twilights (civil, nautical, and astronomical), and night are indicated by the color bands from yellow to gray. The transitions to and from daylight saving time are indicated by the 'DST' labels.

Humidity

We base the humidity comfort level on the dew point, as it determines whether perspiration will evaporate from the skin, thereby cooling the body. Lower dew points feel drier and higher dew points feel more humid. Unlike temperature, which typically varies significantly between night and day, dew point tends to change more slowly, so while the temperature may drop at night, a muggy day is typically followed by a muggy night.

Fort Smith Municipal Airport experiences extreme seasonal variation in the perceived humidity.

The muggier period of the year lasts for 4.6 months, from May 12 to September 30, during which time the comfort level is muggy, oppressive, or miserable at least 21% of the time. The muggiest day of the year is July 22, with muggy conditions 85% of the time.

The least muggy day of the year is February 19, when muggy conditions are essentially unheard of.

Humidity Comfort Levels

Humidity Comfort Levels at Fort Smith Municipal AirportmuggyJanFebMarAprMayJunJulAugSepOctNovDec0%10%20%30%40%50%60%70%80%90%100%Feb 190%Feb 190%85%Jul 2285%Jul 22May 1221%May 1221%Sep 3021%Sep 3021%oppressiveoppressivemuggymuggyhumidhumiddrydrymiserablemiserablecomfortablecomfortable
The percentage of time spent at various humidity comfort levels, categorized by dew point: dry < 55°F < comfortable < 60°F < humid < 65°F < muggy < 70°F < oppressive < 75°F < miserable.

Wind

This section discusses the wide-area hourly average wind vector (speed and direction) at 10 meters above the ground. The wind experienced at any given location is highly dependent on local topography and other factors, and instantaneous wind speed and direction vary more widely than hourly averages.

The average hourly wind speed at Fort Smith Municipal Airport experiences mild seasonal variation over the course of the year.

The windier part of the year lasts for 7.1 months, from October 19 to May 21, with average wind speeds of more than 6.1 miles per hour. The windiest day of the year is April 1, with an average hourly wind speed of 7.6 miles per hour.

The calmer time of year lasts for 4.9 months, from May 21 to October 19. The calmest day of the year is August 3, with an average hourly wind speed of 4.6 miles per hour.

Average Wind Speed

Average Wind Speed at Fort Smith Municipal AirportwindywindyJanFebMarAprMayJunJulAugSepOctNovDec0 mph1 mph2 mph3 mph4 mph5 mph6 mph7 mph8 mph9 mph10 mph11 mph12 mphApr 17.6 mphApr 17.6 mphAug 34.6 mphAug 34.6 mphOct 196.1 mphOct 196.1 mphMay 216.1 mphMay 216.1 mph
The average of mean hourly wind speeds (dark gray line), with 25th to 75th and 10th to 90th percentile bands.

The predominant average hourly wind direction at Fort Smith Municipal Airport varies throughout the year.

The wind is most often from the south for 6.6 months, from February 20 to September 9 and for 3.4 months, from September 17 to December 30, with a peak percentage of 55% on June 25. The wind is most often from the east for 1.1 weeks, from September 9 to September 17, with a peak percentage of 36% on September 9. The wind is most often from the north for 1.7 months, from December 30 to February 20, with a peak percentage of 30% on January 1.

Wind Direction

Wind Direction at Fort Smith Municipal AirportNSSJanFebMarAprMayJunJulAugSepOctNovDec0%100%20%80%40%60%60%40%80%20%100%0%southeastnorthwest
The percentage of hours in which the mean wind direction is from each of the four cardinal wind directions (north, east, south, and west), excluding hours in which the mean wind speed is less than 1 mph. The lightly tinted areas at the boundaries are the percentage of hours spent in the implied intermediate directions (northeast, southeast, southwest, and northwest).

Best Time of Year to Visit

To characterize how pleasant the weather is at Fort Smith Municipal Airport throughout the year, we compute two travel scores.

The tourism score favors clear, rainless days with perceived temperatures between 65°F and 80°F. Based on this score, the best times of year to visit Fort Smith Municipal Airport for general outdoor tourist activities are from early May to late June and from mid August to mid October, with a peak score in the third week of September.

Tourism Score

Tourism Score at Fort Smith Municipal Airportbest timebest timeJanFebMarAprMayJunJulAugSepOctNovDec02468106.26.20.80.86.06.05.35.3 precipitationprecipitationcloudscloudstemperaturetemperaturetourism score
The tourism score (filled area), and its constituents: the temperature score (red line), the cloud cover score (blue line), and the precipitation score (green line).

The beach/pool score favors clear, rainless days with perceived temperatures between 75°F and 90°F. Based on this score, the best time of year to visit Fort Smith Municipal Airport for hot-weather activities is from mid June to early September, with a peak score in the first week of July.

Beach/Pool Score

Beach/Pool Score at Fort Smith Municipal Airportbest timeJanFebMarAprMayJunJulAugSepOctNovDec02468106.36.30.10.1 precipitationprecipitationcloudscloudstemperaturetemperaturebeach/pool score
The beach/pool score (filled area), and its constituents: the temperature score (red line), the cloud cover score (blue line), and the precipitation score (green line).

Methodology

For each hour between 8:00 AM and 9:00 PM of each day in the analysis period (1980 to 2016), independent scores are computed for perceived temperature, cloud cover, and total precipitation. Those scores are combined into a single hourly composite score, which is then aggregated into days, averaged over all the years in the analysis period, and smoothed.

Our cloud cover score is 10 for fully clear skies, falling linearly to 9 for mostly clear skies, and to 1 for fully overcast skies.

Our precipitation score, which is based on the three-hour precipitation centered on the hour in question, is 10 for no precipitation, falling linearly to 9 for trace precipitation, and to 0 for 0.04 inches of precipitation or more.

Our tourism temperature score is 0 for perceived temperatures below 50°F, rising linearly to 9 for 65°F, to 10 for 75°F, falling linearly to 9 for 80°F, and to 1 for 90°F or hotter.

Our beach/pool temperature score is 0 for perceived temperatures below 65°F, rising linearly to 9 for 75°F, to 10 for 82°F, falling linearly to 9 for 90°F, and to 1 for 100°F or hotter.

Growing Season

Definitions of the growing season vary throughout the world, but for the purposes of this report, we define it as the longest continuous period of non-freezing temperatures (≥ 32°F) in the year (the calendar year in the Northern Hemisphere, or from July 1 until June 30 in the Southern Hemisphere).

The growing season at Fort Smith Municipal Airport typically lasts for 7.5 months (230 days), from around March 24 to around November 9, rarely starting before March 2 or after April 14, and rarely ending before October 21 or after November 29.

Time Spent in Various Temperature Bands and the Growing Season

Time Spent in Various Temperature Bands and the Growing Season at Fort Smith Municipal Airportgrowing seasonJanFebMarAprMayJunJulAugSepOctNovDec0%100%10%90%20%80%30%70%40%60%50%50%60%40%70%30%80%20%90%10%100%0%50%Mar 2450%Mar 2450%Nov 950%Nov 990%Apr 1490%Apr 1490%Oct 2190%Oct 2110%Mar 210%Mar 210%Nov 2910%Nov 290%Dec 280%Dec 28Jul 18100%Jul 18100%freezingvery coldcoldcomfortablewarmhotcoolsweltering
The percentage of time spent in various temperature bands: frigid < 15°F < freezing < 32°F < very cold < 45°F < cold < 55°F < cool < 65°F < comfortable < 75°F < warm < 85°F < hot < 95°F < sweltering. The black line is the percentage chance that a given day is within the growing season.

Growing degree days are a measure of yearly heat accumulation used to predict plant and animal development, and defined as the integral of warmth above a base temperature, discarding any excess above a maximum temperature. In this report, we use a base of 50°F and a cap of 86°F.

Based on growing degree days alone, the first spring blooms at Fort Smith Municipal Airport should appear around February 19, only rarely appearing before February 3 or after March 9.

Growing Degree Days

Growing Degree Days at Fort Smith Municipal AirportJanFebMarAprMayJunJulAugSepOctNovDec0°F1,000°F2,000°F3,000°F4,000°F5,000°FFeb 1986°FFeb 1986°FMay 13900°FMay 13900°FJun 201,800°FJun 201,800°FDec 315,256°FDec 315,256°F
The average growing degree days accumulated over the course of the year, with 25th to 75th and 10th to 90th percentile bands.

Solar Energy

This section discusses the total daily incident shortwave solar energy reaching the surface of the ground over a wide area, taking full account of seasonal variations in the length of the day, the elevation of the Sun above the horizon, and absorption by clouds and other atmospheric constituents. Shortwave radiation includes visible light and ultraviolet radiation.

The average daily incident shortwave solar energy experiences significant seasonal variation over the course of the year.

The brighter period of the year lasts for 4.1 months, from April 24 to August 27, with an average daily incident shortwave energy per square meter above 6.1 kWh. The brightest day of the year is July 12, with an average of 7.0 kWh.

The darker period of the year lasts for 3.0 months, from November 8 to February 7, with an average daily incident shortwave energy per square meter below 3.4 kWh. The darkest day of the year is December 23, with an average of 2.4 kWh.

Average Daily Incident Shortwave Solar Energy

Average Daily Incident Shortwave Solar Energy at Fort Smith Municipal AirportbrightdarkdarkJanFebMarAprMayJunJulAugSepOctNovDec0 kWh1 kWh2 kWh3 kWh4 kWh5 kWh6 kWh7 kWh8 kWh9 kWhJul 127.0 kWhJul 127.0 kWhDec 232.4 kWhDec 232.4 kWhApr 246.1 kWhApr 246.1 kWhAug 276.1 kWhAug 276.1 kWhNov 83.4 kWhNov 83.4 kWhFeb 73.4 kWhFeb 73.4 kWh
The average daily shortwave solar energy reaching the ground per square meter (orange line), with 25th to 75th and 10th to 90th percentile bands.

Topography

For the purposes of this report, the geographical coordinates of Fort Smith Municipal Airport are 35.336 deg latitude, -94.367 deg longitude, and 469 ft elevation.

The topography within 2 miles of Fort Smith Municipal Airport contains only modest variations in elevation, with a maximum elevation change of 292 feet and an average elevation above sea level of 474 feet. Within 10 miles contains only modest variations in elevation (525 feet). Within 50 miles contains significant variations in elevation (2,428 feet).

The area within 2 miles of Fort Smith Municipal Airport is covered by artificial surfaces (86%) and cropland (13%), within 10 miles by cropland (48%) and artificial surfaces (26%), and within 50 miles by trees (59%) and cropland (36%).

Data Sources

This report illustrates the typical weather at Fort Smith Municipal Airport, 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

Fort Smith Municipal Airport has a weather station that reported reliably enough during the analysis period that we have included it in our network. When available, historical temperature and dew point measurements are taken directly from this weather station. These records are obtained from NOAA's Integrated Surface Hourly data set, falling back on ICAO METAR records as required.

In the case of missing or erroneous measurements from this station, we fall back on records from nearby stations, adjusted according to typical seasonal and diurnal intra-station differences. For a given day of the year and hour of the day, the fallback station is selected to minimize the prediction error over the years for which there are measurements for both stations.

The stations on which we may fall back include but are not limited to Robert S Kerr Airport, Sallisaw Municipal Airport, Drake Field, Stigler Regional Airport, Mena Intermountain Municipal Airport, Smith Field, Tahlequah Municipal Airport, and Northwest Arkansas Regional Airport.

Other Data

All data relating to the Sun's position (e.g., sunrise and sunset) are computed using astronomical formulas from the book, Astronomical Tables of the Sun, Moon and Planets , by Jean Meeus.

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.

Land Use data comes from the Global Land Cover SHARE database , published by the Food and Agriculture Organization of the United Nations.

Elevation data comes from the Shuttle Radar Topography Mission (SRTM) , published by NASA's Jet Propulsion Laboratory.

Names, locations, and time zones of places and some airports come from the GeoNames Geographical Database .

Time zones for aiports and weather stations are provided by AskGeo.com .

Maps are © Esri, with data from National Geographic, Esri, DeLorme, NAVTEQ, UNEP-WCMC, USGS, NASA, ESA, METI, NRCAN, GEBCO, NOAA, and iPC.

Disclaimer

The information on this site is provided as is, without any assurances as to its accuracy or suitability for any purpose. Weather data is prone to errors, outages, and other defects. We assume no responsibility for any decisions made on the basis of the content presented on this site.

We draw particular cautious attention to our reliance on the MERRA-2 model-based reconstructions for a number of important data series. While having the tremendous advantages of temporal and spatial completeness, these reconstructions: (1) are based on computer models that may have model-based errors, (2) are coarsely sampled on a 50 km grid and are therefore unable to reconstruct the local variations of many microclimates, and (3) have particular difficulty with the weather in some coastal areas, especially small islands.

We further caution that our travel scores are only as good as the data that underpin them, that weather conditions at any given location and time are unpredictable and variable, and that the definition of the scores reflects a particular set of preferences that may not agree with those of any particular reader.