Average Weather in Muscle Shoals Alabama, United States
In Muscle Shoals, the summers are long, hot, and muggy; the winters are short, chilly, and wet; and it is partly cloudy year round. Over the course of the year, the temperature typically varies from 34°F to 90°F and is rarely below 19°F or above 97°F.
The hot season lasts for 3.9 months, from May 24 to September 22, with an average daily high temperature above 82°F. The hottest day of the year is July 22, with an average high of 90°F and low of 71°F.
The cool season lasts for 2.9 months, from November 28 to February 25, with an average daily high temperature below 59°F. The coldest day of the year is January 16, with an average low of 34°F and high of 51°F.
Average High and Low Temperature
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
In Muscle Shoals, the average percentage of the sky covered by clouds experiences significant seasonal variation over the course of the year.
The clearer part of the year in Muscle Shoals begins around June 9 and lasts for 5.3 months, ending around November 18. On August 12, the clearest day of the year, the sky is clear, mostly clear, or partly cloudy 68% of the time, and overcast or mostly cloudy 32% of the time.
The cloudier part of the year begins around November 18 and lasts for 6.7 months, ending around June 9. On January 4, the cloudiest day of the year, the sky is overcast or mostly cloudy 55% of the time, and clear, mostly clear, or partly cloudy 45% of the time.
A wet day is one with at least 0.04 inches of liquid or liquid-equivalent precipitation. The chance of wet days in Muscle Shoals varies throughout the year.
The wetter season lasts 8.3 months, from December 10 to August 20, with a greater than 32% chance of a given day being a wet day. The chance of a wet day peaks at 41% on July 9.
The drier season lasts 3.7 months, from August 20 to December 10. The smallest chance of a wet day is 22% on October 11.
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 41% on July 9.
Daily Chance of Precipitation
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. Muscle Shoals experiences significant seasonal variation in monthly rainfall.
Rain falls throughout the year in Muscle Shoals. The most rain falls during the 31 days centered around December 5, with an average total accumulation of 5.3 inches.
The least rain falls around August 22, with and average total accumulation of 2.7 inches.
Average Monthly Rainfall
The sliding 31-day liquid-equivalent quantity of snowfall in Muscle Shoals 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
The length of the day in Muscle Shoals varies significantly over the course of the year. In 2017, the shortest day is December 21, with 9 hours, 49 minutes of daylight; the longest day is June 21, with 14 hours, 29 minutes of daylight.
Hours of Daylight and Twilight
The earliest sunrise is at 5:36 AM on June 12, and the latest sunrise is 1 hour, 38 minutes later at 7:14 AM on November 4. The earliest sunset is at 4:39 PM on December 5, and the latest sunset is 3 hours, 29 minutes later at 8:08 PM on June 28.
Daylight saving time (DST) is observed in Muscle Shoals 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
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.
Muscle Shoals experiences extreme seasonal variation in the perceived humidity.
The muggier period of the year lasts for 4.5 months, from May 15 to September 29, during which time the comfort level is muggy, oppressive, or miserable at least 22% of the time. The muggiest day of the year is July 22, with muggy conditions 89% of the time.
The least muggy day of the year is February 10, when muggy conditions are essentially unheard of.
Humidity Comfort Levels
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 in Muscle Shoals experiences mild seasonal variation over the course of the year.
The windier part of the year lasts for 6.8 months, from October 20 to May 15, with average wind speeds of more than 3.0 miles per hour. The windiest day of the year is February 25, with an average hourly wind speed of 3.9 miles per hour.
The calmer time of year lasts for 5.2 months, from May 15 to October 20. The calmest day of the year is July 28, with an average hourly wind speed of 2.2 miles per hour.
Average Wind Speed
The predominant average hourly wind direction in Muscle Shoals varies throughout the year.
The wind is most often from the north for 1.0 months, from January 22 to February 22 and for 4.0 weeks, from September 13 to October 11, with a peak percentage of 33% on January 29. The wind is most often from the south for 4.8 months, from February 22 to July 16; for 1.2 months, from July 28 to September 3; and for 3.4 months, from October 11 to January 22, with a peak percentage of 46% on May 15. The wind is most often from the west for 1.7 weeks, from July 16 to July 28, with a peak percentage of 32% on July 16.
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 4.8 months, from April 11 to September 4, with an average daily incident shortwave energy per square meter above 5.7 kWh. The brightest day of the year is June 22, with an average of 6.6 kWh.
The darker period of the year lasts for 2.8 months, from November 12 to February 6, with an average daily incident shortwave energy per square meter below 3.3 kWh. The darkest day of the year is December 25, with an average of 2.4 kWh.
Average Daily Incident Shortwave Solar Energy
For the purposes of this report, the geographical coordinates of Muscle Shoals are 34.745 deg latitude, -87.668 deg longitude, and 505 ft elevation.
The topography within 2 miles of Muscle Shoals contains only modest variations in elevation, with a maximum elevation change of 148 feet and an average elevation above sea level of 511 feet. Within 10 miles also contains only modest variations in elevation (482 feet). Within 50 miles contains only modest variations in elevation (863 feet).
The area within 2 miles of Muscle Shoals is covered by artificial surfaces (81%) and cropland (13%), within 10 miles by cropland (50%) and trees (28%), and within 50 miles by trees (60%) and cropland (33%).
This report illustrates the typical weather in Muscle Shoals, 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 Muscle Shoals.
For each station, the records are corrected for the elevation difference between that station and Muscle Shoals 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 Muscle Shoals is computed as the weighted average of the individual contributions from each station, with weights proportional to the inverse of the distance between Muscle Shoals and a given station.
The stations contributing to this reconstruction are: Muscle Shoals Regional Airport (98%, 6 kilometers, east); Tupelo Regional Airport (1.2%, 115 kilometers, southwest); and Mc Kellar-Sipes Regional Airport (0.9%, 148 kilometers, northwest).
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.