Summer Weather in Huntsville United States

Daily high temperatures are around 86°F, rarely falling below 75°F or exceeding 96°F. The highest daily average high temperature is 89°F on July 21.

Daily low temperatures are around 67°F, rarely falling below 55°F or exceeding 74°F. The highest daily average low temperature is 70°F on July 22.

For reference, on July 21, the hottest day of the year, temperatures in Huntsville typically range from 70°F to 89°F, while on January 23, the coldest day of the year, they range from 33°F to 50°F.

The figure below shows you a compact characterization of the hourly average summer temperatures. 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.

Podgorica, Montenegro (5,351 miles away) and Luoqiao, China (7,897 miles) are the far-away foreign places with temperatures most similar to Huntsville (view comparison).

© OpenStreetMap contributors

Compare Huntsville to another city:

CompareMap

The summer in Huntsville experiences decreasing cloud cover, with the percentage of time that the sky is overcast or mostly cloudy decreasing from 44% to 34%.

The clearest day of the summer is August 13, with clear, mostly clear, or partly cloudy conditions 67% of the time.

For reference, on January 5, 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%.

A wet day is one with at least 0.04 inches of liquid or liquid-equivalent precipitation. In Huntsville, the chance of a wet day over the course of the summer is very rapidly decreasing, starting the season at 38% and ending it at 27%.

For reference, the year's highest daily chance of a wet day is 41% on June 28, and its lowest chance is 22% on October 14.

Rainfall

To show variation within the season and not just the monthly totals, we show the rainfall accumulated over a sliding 31-day period centered around each day.

The average sliding 31-day rainfall during the summer in Huntsville is decreasing, starting the season at 3.4 inches, when it rarely exceeds 5.7 inches or falls below 1.5 inches, and ending the season at 2.9 inches, when it rarely exceeds 5.5 inches or falls below 0.9 inches.

The lowest average 31-day accumulation is 2.8 inches on August 21.

Over the course of the summer in Huntsville, the length of the day is rapidly decreasing. From the start to the end of the season, the length of the day decreases by 1 hour, 26 minutes, implying an average daily decrease of 57 seconds, and weekly decrease of 6 minutes, 39 seconds.

The shortest day of the summer is August 31, with 12 hours, 54 minutes of daylight and the longest day is June 20, with 14 hours, 29 minutes of daylight.

The earliest sunrise of the summer in Huntsville is 5:32 AM on June 12 and the latest sunrise is 46 minutes later at 6:19 AM on August 31.

The latest sunset is 8:03 PM on June 28 and the earliest sunset is 50 minutes earlier at 7:13 PM on August 31.

Daylight saving time is observed in Huntsville during 2024, but it neither starts nor ends during the summer, so the entire season is in standard time.

For reference, on June 20, the longest day of the year, the Sun rises at 5:33 AM and sets 14 hours, 29 minutes later, at 8:02 PM, while on December 21, the shortest day of the year, it rises at 6:50 AM and sets 9 hours, 50 minutes later, at 4:39 PM.

The figure below presents a compact representation of the sun's elevation (the angle of the sun above the horizon) and azimuth (its compass bearing) for every hour of every day in the reporting period. The horizontal axis is the day of the year and the vertical axis is the hour of the day. For a given day and hour of that day, the background color indicates the azimuth of the sun at that moment. The black isolines are contours of constant solar elevation.

The figure below presents a compact representation of key lunar data for the summer of 2024. The horizontal axis is the day, the vertical axis is the hour of the day, and the colored areas indicate when the moon is above the horizon. The vertical gray bars (new Moons) and blue bars (full Moons) indicate key Moon phases. The label associated with each bar indicates the date and time that the phase is obtained, and the companion time labels indicate the rise and set times of the Moon for the nearest time interval in which the moon is above the horizon.

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.

The chance that a given day will be muggy in Huntsville is very rapidly increasing during the summer, rising from 40% to 61% over the course of the season.

The highest chance of a muggy day during the summer is 85% on July 22.

For reference, on July 21, the muggiest day of the year, there are muggy conditions 85% of the time, while on January 14, the least muggy day of the year, there are muggy conditions 0% of the time.

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 Huntsville is essentially constant during the summer, remaining within 0.4 miles per hour of 4.5 miles per hour throughout.

For reference, on February 25, the windiest day of the year, the daily average wind speed is 7.2 miles per hour, while on July 27, the calmest day of the year, the daily average wind speed is 4.0 miles per hour.

The lowest daily average wind speed during the summer is 4.0 miles per hour on July 27.

The wind direction in Huntsville during the summer is predominantly out of the south from June 1 to June 29, the west from June 29 to July 29, and the north from July 29 to August 31.

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 in Huntsville typically lasts for 7.3 months (224 days), from around March 25 to around November 4, rarely starting before March 4 or after April 14, and rarely ending before October 18 or after November 25.

The summer in Huntsville is reliably fully 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.

The average accumulated growing degree days in Huntsville are very rapidly increasing during the summer, increasing by 2,396°F, from 1,247°F to 3,643°F, over the course of the season.

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 in Huntsville is gradually decreasing during the summer, falling by 0.8 kWh, from 6.6 kWh to 5.8 kWh, over the course of the season.

The highest average daily incident shortwave solar energy during the summer is 6.6 kWh on June 20.

For the purposes of this report, the geographical coordinates of Huntsville are 34.730 deg latitude, -86.586 deg longitude, and 630 ft elevation.

The topography within 2 miles of Huntsville contains only modest variations in elevation, with a maximum elevation change of 384 feet and an average elevation above sea level of 655 feet. Within 10 miles contains only modest variations in elevation (1,086 feet). Within 50 miles also contains very significant variations in elevation (1,532 feet).

The area within 2 miles of Huntsville is covered by artificial surfaces (95%), within 10 miles by cropland (43%) and artificial surfaces (30%), and within 50 miles by cropland (53%) and trees (40%).