Average Weather in September in Kilómetro 40 Mexico
Daily high temperatures are around 84°F, rarely falling below 79°F or exceeding 88°F. The lowest daily average high temperature is 84°F on September 14.
Daily low temperatures are around 70°F, rarely falling below 67°F or exceeding 72°F.
For reference, on May 12, the hottest day of the year, temperatures in Kilómetro 40 typically range from 68°F to 88°F, while on January 24, the coldest day of the year, they range from 62°F to 84°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 Kilómetro 40 experiences essentially constant cloud cover, with the percentage of time that the sky is overcast or mostly cloudy remaining about 91% throughout the month. The highest chance of overcast or mostly cloudy conditions is 93% on September 17.
The clearest day of the month is September 30, with clear, mostly clear, or partly cloudy conditions 11% of the time.
For reference, on September 14, the cloudiest day of the year, the chance of overcast or mostly cloudy conditions is 93%, while on March 1, the clearest day of the year, the chance of clear, mostly clear, or partly cloudy skies is 72%.
Cloud Cover Categories in September
A wet day is one with at least 0.04 inches of liquid or liquid-equivalent precipitation. In Kilómetro 40, the chance of a wet day over the course of September is very rapidly decreasing, starting the month at 67% and ending it at 54%.
For reference, the year's highest daily chance of a wet day is 69% on September 13, and its lowest chance is 1% on April 3.
Probability of Precipitation in September
The average sliding 31-day rainfall during September in Kilómetro 40 is rapidly decreasing, starting the month at 8.2 inches, when it rarely exceeds 13.9 inches or falls below 3.7 inches, and ending the month at 6.6 inches, when it rarely exceeds 10.4 inches or falls below 3.1 inches.
The highest average 31-day accumulation is 8.4 inches on September 8.
Average Monthly Rainfall in September
Over the course of September in Kilómetro 40, the length of the day is gradually decreasing. From the start to the end of the month, the length of the day decreases by 27 minutes, implying an average daily decrease of 57 seconds, and weekly decrease of 6 minutes, 37 seconds.
The shortest day of the month is September 30, with 11 hours, 59 minutes of daylight and the longest day is September 1, with 12 hours, 27 minutes of daylight.
Hours of Daylight and Twilight in September
The earliest sunrise of the month in Kilómetro 40 is 7:25 AM on September 1 and the latest sunrise is 4 minutes later at 7:29 AM on September 30.
The latest sunset is 7:52 PM on September 1 and the earliest sunset is 24 minutes earlier at 7:28 PM on September 30.
Daylight saving time is observed in Kilómetro 40 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 7:06 AM and sets 13 hours, 9 minutes later, at 8:15 PM, while on December 21, the shortest day of the year, it rises at 7:03 AM and sets 11 hours, 7 minutes later, at 6:10 PM.
Sunrise & Sunset with Twilight and Daylight Saving Time in September
The chance that a given day will be muggy in Kilómetro 40 is essentially constant during September, remaining around 99% throughout.
For reference, on September 16, the muggiest day of the year, there are muggy conditions 99% of the time, while on March 11, the least muggy day of the year, there are muggy conditions 38% of the time.
Humidity Comfort Levels in September
The average hourly wind speed in Kilómetro 40 is essentially constant during September, remaining within 0.2 miles per hour of 5.6 miles per hour throughout.
For reference, on March 31, the windiest day of the year, the daily average wind speed is 6.3 miles per hour, while on November 30, the calmest day of the year, the daily average wind speed is 4.9 miles per hour.
The highest daily average wind speed during September is 5.7 miles per hour on September 13.
Average Wind Speed in September
Wind Direction in September
Kilómetro 40 is located near a large body of water (e.g., ocean, sea, or large lake). This section reports on the wide-area average surface temperature of that water.
The average surface water temperature in Kilómetro 40 is essentially constant during September, remaining around 86°F throughout.
Average Water Temperature in September
Temperatures in Kilómetro 40 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
The average accumulated growing degree days in Kilómetro 40 are rapidly increasing during September, increasing by 752°F, from 6,152°F to 6,905°F, over the course of the month.
Growing Degree Days in September
The average daily incident shortwave solar energy in Kilómetro 40 is essentially constant during September, remaining within 0.1 kWh of 4.6 kWh throughout.
Average Daily Incident Shortwave Solar Energy in September
For the purposes of this report, the geographical coordinates of Kilómetro 40 are 17.049 deg latitude, -99.771 deg longitude, and 1,739 ft elevation.
The topography within 2 miles of Kilómetro 40 contains very significant variations in elevation, with a maximum elevation change of 1,365 feet and an average elevation above sea level of 1,696 feet. Within 10 miles contains very significant variations in elevation (6,801 feet). Within 50 miles also contains extreme variations in elevation (11,808 feet).
The area within 2 miles of Kilómetro 40 is covered by trees (57%) and cropland (43%), within 10 miles by trees (70%) and cropland (26%), and within 50 miles by trees (36%) and water (31%).
This report illustrates the typical weather in Kilómetro 40 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 is only a single weather station, General Juan N. Álvarez International Airport, in our network suitable to be used as a proxy for the historical temperature and dew point records of Kilómetro 40.
At a distance of 33 kilometers from Kilómetro 40, closer than our threshold of 150 kilometers, this station is deemed sufficiently nearby to be relied upon as our primary source for temperature and dew point records.
The station records are corrected for the elevation difference between the station and Kilómetro 40 according to the International Standard Atmosphere , and by the relative change present in the MERRA-2 satellite-era reanalysis between the two locations.
Please note that the station records themselves may additionally have been back-filled using other nearby stations or the MERRA-2 reanalysis.
Time zones for aiports and weather stations are provided by AskGeo.com .