Average Weather in September in Jonestown Texas, United States
Daily high temperatures decrease by 7°F, from 93°F to 85°F, rarely falling below 77°F or exceeding 98°F.
Daily low temperatures decrease by 8°F, from 74°F to 66°F, rarely falling below 56°F or exceeding 77°F.
For reference, on August 6, the hottest day of the year, temperatures in Jonestown typically range from 75°F to 96°F, while on January 6, the coldest day of the year, they range from 42°F to 60°F.
Average High and Low Temperature in September
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.
Average Hourly Temperature in September
The month of September in Jonestown experiences decreasing cloud cover, with the percentage of time that the sky is overcast or mostly cloudy decreasing from 39% to 29%.
The clearest day of the month is September 30, with clear, mostly clear, or partly cloudy conditions 71% of the time.
For reference, on January 3, the cloudiest day of the year, the chance of overcast or mostly cloudy conditions is 45%, while on October 10, the clearest day of the year, the chance of clear, mostly clear, or partly cloudy skies is 72%.
Cloud Cover Categories in September
0% clear 20% mostly clear 40% partly cloudy 60% mostly cloudy 80% overcast 100%
A wet day is one with at least 0.04 inches of liquid or liquid-equivalent precipitation. In Jonestown, the chance of a wet day over the course of September is gradually decreasing, starting the month at 24% and ending it at 21%.
For reference, the year's highest daily chance of a wet day is 34% on May 27, and its lowest chance is 14% on January 1.
Probability of Precipitation in September
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 Jonestown is gradually increasing, starting the month at 2.2 inches, when it rarely exceeds 4.8 inches or falls below 0.3 inches, and ending the month at 2.6 inches, when it rarely exceeds 5.4 inches or falls below 0.3 inches.
Average Monthly Rainfall in September
Over the course of September in Jonestown, the length of the day is decreasing. From the start to the end of the month, the length of the day decreases by 53 minutes, implying an average daily decrease of 1 minute, 49 seconds, and weekly decrease of 12 minutes, 43 seconds.
The shortest day of the month is September 30, with 11 hours, 53 minutes of daylight and the longest day is September 1, with 12 hours, 46 minutes of daylight.
Hours of Daylight and Twilight in September
The earliest sunrise of the month in Jonestown is 7:08 AM on September 1 and the latest sunrise is 16 minutes later at 7:24 AM on September 30.
The latest sunset is 7:54 PM on September 1 and the earliest sunset is 36 minutes earlier at 7:18 PM on September 30.
Daylight saving time is observed in Jonestown during 2018, but it neither starts nor ends during September, so the entire month is in daylight saving time.
For reference, on June 21, the longest day of the year, the Sun rises at 6:29 AM and sets 14 hours, 7 minutes later, at 8:37 PM, while on December 21, the shortest day of the year, it rises at 7:24 AM and sets 10 hours, 11 minutes later, at 5:35 PM.
Sunrise & Sunset with Twilight in September
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 Jonestown is very rapidly decreasing during September, falling from 67% to 36% over the course of the month.
For reference, on June 26, the muggiest day of the year, there are muggy conditions 81% of the time, while on January 23, the least muggy day of the year, there are muggy conditions 1% of the time.
Humidity Comfort Levels in September
dry 55°F comfortable 60°F humid 65°F muggy 70°F oppressive 75°F miserable
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 Jonestown is essentially constant during September, remaining within 0.2 miles per hour of 8.4 miles per hour throughout.
For reference, on April 2, the windiest day of the year, the daily average wind speed is 11.2 miles per hour, while on September 5, the calmest day of the year, the daily average wind speed is 8.1 miles per hour.
The lowest daily average wind speed during September is 8.1 miles per hour on September 6.
Average Wind Speed in September
Wind Direction in September
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 Jonestown typically lasts for 9.9 months (300 days), from around February 14 to around December 10, rarely starting before January 13 or after March 14, and rarely ending before November 16 or after January 4.
The month of September in Jonestown is reliably fully within the growing season.
Time Spent in Various Temperature Bands and the Growing Season in September
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 Jonestown are rapidly increasing during September, increasing by 806°F, from 4,896°F to 5,702°F, over the course of the month.
Growing Degree Days in September
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 Jonestown is essentially constant during September, remaining within 0.2 kWh of 5.6 kWh throughout.
Average Daily Incident Shortwave Solar Energy in September
For the purposes of this report, the geographical coordinates of Jonestown are 30.495 deg latitude, -97.923 deg longitude, and 902 ft elevation.
The topography within 2 miles of Jonestown contains only modest variations in elevation, with a maximum elevation change of 489 feet and an average elevation above sea level of 865 feet. Within 10 miles contains only modest variations in elevation (843 feet). Within 50 miles also contains very significant variations in elevation (1,673 feet).
The area within 2 miles of Jonestown is covered by trees (88%), within 10 miles by trees (44%) and shrubs (23%), and within 50 miles by shrubs (29%) and grassland (27%).
This report illustrates the typical weather in Jonestown 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 Jonestown.
For each station, the records are corrected for the elevation difference between that station and Jonestown 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 Jonestown is computed as the weighted average of the individual contributions from each station, with weights proportional to the inverse of the distance between Jonestown and a given station.
The stations contributing to this reconstruction are: Largo Vista / Rusty Allen Airport (68%, 4.2 kilometers, west); Austin City, Austin Camp Mabry (18%, 25 kilometers, southeast); and Georgetown Municipal Airport (14%, 31 kilometers, northeast).
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.