Average Weather in September in Xilitla Mexico
Daily high temperatures decrease by 3°F, from 84°F to 81°F, rarely falling below 75°F or exceeding 90°F.
Daily low temperatures decrease by 2°F, from 68°F to 65°F, rarely falling below 60°F or exceeding 70°F.
For reference, on May 10, the hottest day of the year, temperatures in Xilitla typically range from 68°F to 91°F, while on January 7, the coldest day of the year, they range from 53°F to 73°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
Lupane, Zimbabwe (9,008 miles away); Ta‘izz, Yemen (8,964 miles); and Ikalamavony, Madagascar (10,236 miles) are the far-away foreign places with temperatures most similar to Xilitla (view comparison).
The month of September in Xilitla experiences gradually decreasing cloud cover, with the percentage of time that the sky is overcast or mostly cloudy decreasing from 74% to 69%. The highest chance of overcast or mostly cloudy conditions is 75% on September 16.
The clearest day of the month is September 30, with clear, mostly clear, or partly cloudy conditions 31% of the time.
For reference, on September 16, the cloudiest day of the year, the chance of overcast or mostly cloudy conditions is 75%, while on May 10, the clearest day of the year, the chance of clear, mostly clear, or partly cloudy skies is 66%.
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 Xilitla, the chance of a wet day over the course of September is very rapidly decreasing, starting the month at 57% and ending it at 45%.
For reference, the year's highest daily chance of a wet day is 58% on July 3, and its lowest chance is 13% on December 26.
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 Xilitla is decreasing, starting the month at 7.4 inches, when it rarely exceeds 12.6 inches or falls below 3.0 inches, and ending the month at 6.9 inches, when it rarely exceeds 11.6 inches or falls below 2.8 inches.
The highest average 31-day accumulation is 8.0 inches on September 14.
Average Monthly Rainfall in September
Over the course of September in Xilitla, the length of the day is decreasing. From the start to the end of the month, the length of the day decreases by 35 minutes, implying an average daily decrease of 1 minute, 12 seconds, and weekly decrease of 8 minutes, 27 seconds.
The shortest day of the month is September 30, with 11 hours, 58 minutes of daylight and the longest day is September 1, with 12 hours, 33 minutes of daylight.
Hours of Daylight and Twilight in September
The earliest sunrise of the month in Xilitla is 7:19 AM on September 1 and the latest sunrise is 7 minutes later at 7:26 AM on September 30.
The latest sunset is 7:52 PM on September 1 and the earliest sunset is 28 minutes earlier at 7:24 PM on September 30.
Daylight saving time is observed in Xilitla 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 6:54 AM and sets 13 hours, 26 minutes later, at 8:20 PM, while on December 21, the shortest day of the year, it rises at 7:09 AM and sets 10 hours, 50 minutes later, at 5:59 PM.
Sunrise & Sunset with Twilight and Daylight Saving Time 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 Xilitla is very rapidly decreasing during September, falling from 86% to 62% over the course of the month.
The highest chance of a muggy day during September is 86% on September 2.
For reference, on September 1, the muggiest day of the year, there are muggy conditions 86% of the time, while on January 19, the least muggy day of the year, there are muggy conditions 0% 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 Xilitla is essentially constant during September, remaining around 5.2 miles per hour throughout.
For reference, on April 20, the windiest day of the year, the daily average wind speed is 6.5 miles per hour, while on December 17, the calmest day of the year, the daily average wind speed is 4.6 miles per hour.
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).
Temperatures in Xilitla are sufficiently warm year round that it is not entirely meaningful to discuss the growing season in these terms. We nevertheless include the chart below as an illustration of the distribution of temperatures experienced throughout the year.
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 Xilitla are rapidly increasing during September, increasing by 691°F, from 5,378°F to 6,070°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 Xilitla is essentially constant during September, remaining within 0.2 kWh of 5.8 kWh throughout.
Average Daily Incident Shortwave Solar Energy in September
For the purposes of this report, the geographical coordinates of Xilitla are 21.387 deg latitude, -98.990 deg longitude, and 2,329 ft elevation.
The topography within 2 miles of Xilitla contains extreme variations in elevation, with a maximum elevation change of 3,612 feet and an average elevation above sea level of 2,305 feet. Within 10 miles also contains extreme variations in elevation (9,344 feet). Within 50 miles also contains extreme variations in elevation (10,338 feet).
The area within 2 miles of Xilitla is covered by cropland (79%) and trees (21%), within 10 miles by cropland (50%) and trees (50%), and within 50 miles by cropland (48%) and trees (43%).
This report illustrates the typical weather in Xilitla 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 2 weather stations near enough to contribute to our estimation of the temperature and dew point in Xilitla.
For each station, the records are corrected for the elevation difference between that station and Xilitla 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 Xilitla is computed as the weighted average of the individual contributions from each station, in addition to a contribution from the MERRA-2 reconstruction, corrected for the difference between the reference elevation of the MERRA-2 grid cell and the elevation of Xilitla.
The station weigths are proportional to the inverse of the distance between Xilitla and a given station.
The weight assigned to the MERRA-2 value depends on the distance from Xilitla to the nearest station, increasing from 0% at 150 kilometers to 100% at 200 kilometers. In this case, the MERRA-2 weight is 8%.
The stations contributing to this reconstruction are: General Francisco Javier Mina International Airport (55%, 154 kilometers, northeast) and Tulancingo (38%, 159 kilometers, southeast).
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.