By: Loan Buddy
Daily high temperatures decrease by 9°F, from 93°F to 84°F, rarely falling below 74°F or exceeding 99°F. Daily low temperatures decrease by 10°F, from 74°F to 65°F, rarely falling below 54°F or exceeding 79°F. For reference, on August 1, the hottest day of the year, temperatures in Dallas typically range from 77°F to 96°F, while on January 4, the coldest day of the year, they range from 39°F to 56°F.
The figure below shows you a compact characterization of the hourly average temperatures for the quarter of the year centered on September. 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.
The month of September in Dallas experiences gradually decreasing cloud cover, with the percentage of time that the sky is overcast or mostly cloudy decreasing from 33% to 27%. The clearest day of the month is September 30, with clear, mostly clear, or partly cloudy conditions 73% of the time.
A wet day is one with at least 0.04 inches of liquid or liquid-equivalent precipitation. In Dallas, the chance of a wet day over the course of September is essentially constant, remaining around 22% throughout. For reference, the year's highest daily chance of a wet day is 37% on May 15, and its lowest chance is 16% on January
To show variation within the month and not just the monthly total, we show the rainfall accumulated over a sliding 31-day period centered around each day. The average sliding 31-day rainfall during September in Dallas is increasing, starting the month at 2.2 inches, when it rarely exceeds 4.6 inches or falls below 0.4 inches, and ending the month at 2.9 inches, when it rarely exceeds 5.9 inches or falls below 0.7 inches.
Over the course of September in Dallas, the length of the day is decreasing. From the start to the end of the month, the length of the day decreases by 58 minutes, implying an average daily decrease of 1 minute, 59 seconds, and weekly decrease of 13 minutes, 54 seconds. The shortest day of the month is September 30, with 11 hours, 52 minutes of daylight and the longest day is September 1, with 12 hours, 50 minutes of daylight
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 Dallas is gradually increasing during September, increasing from 8.1 miles per hour to 9.0 miles per hour over the course of the month.
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 Dallas is gradually decreasing during September, falling by 0.7 kWh, from 5.8 kWh to 5.2 kWh, over the course of the month.
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 Dallas typically lasts for 9.2 months (278 days), from around February 26 to around December 1, rarely starting before January 21 or after March 21, and rarely ending before November 4 or after December 23. The month of September in Dallas is reliably fully within the growing season.
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 Dallas is very rapidly decreasing during September, falling from 66% to 30% over the course of the month. For reference, on July 3, the muggiest day of the year, there are muggy conditions 84% of the time, while on January 21, the least muggy day of the year, there are muggy conditions 0% of the time.
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