Average Weather in September in Barstow Heights California, United States
Daily high temperatures decrease by 9°F, from 97°F to 88°F, rarely falling below 77°F or exceeding 103°F.
Daily low temperatures decrease by 9°F, from 68°F to 59°F, rarely falling below 51°F or exceeding 75°F.
For reference, on July 20, the hottest day of the year, temperatures in Barstow Heights typically range from 72°F to 102°F, while on December 26, the coldest day of the year, they range from 35°F to 57°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
Laghouat, Algeria (6,313 miles away); Turaif, Saudi Arabia (7,585 miles); and Shiraz, Iran (7,939 miles) are the far-away foreign places with temperatures most similar to Barstow Heights (view comparison).
The month of September in Barstow Heights experiences essentially constant cloud cover, with the percentage of time that the sky is overcast or mostly cloudy remaining about 12% throughout the month. The lowest chance of overcast or mostly cloudy conditions is 10% on September 7.
The clearest day of the month is September 7, with clear, mostly clear, or partly cloudy conditions 90% of the time.
For reference, on February 19, the cloudiest day of the year, the chance of overcast or mostly cloudy conditions is 41%, while on September 7, the clearest day of the year, the chance of clear, mostly clear, or partly cloudy skies is 90%.
Cloud Cover Categories in September
A wet day is one with at least 0.04 inches of liquid or liquid-equivalent precipitation. In Barstow Heights, the chance of a wet day over the course of September is gradually decreasing, starting the month at 6% and ending it at 3%.
For reference, the year's highest daily chance of a wet day is 14% on February 21, and its lowest chance is 1% on June 14.
Probability of Precipitation in September
The average sliding 31-day rainfall during September in Barstow Heights is essentially constant, remaining about 0.2 inches throughout, and rarely exceeding 0.6 inches.
The lowest average 31-day accumulation is 0.2 inches on September 29.
Average Monthly Rainfall in September
Over the course of September in Barstow Heights, the length of the day is rapidly decreasing. From the start to the end of the month, the length of the day decreases by 1 hour, 2 minutes, implying an average daily decrease of 2 minutes, 9 seconds, and weekly decrease of 15 minutes, 3 seconds.
The shortest day of the month is September 30, with 11 hours, 51 minutes of daylight and the longest day is September 1, with 12 hours, 54 minutes of daylight.
Hours of Daylight and Twilight in September
The earliest sunrise of the month in Barstow Heights is 6:21 AM on September 1 and the latest sunrise is 21 minutes later at 6:42 AM on September 30.
The latest sunset is 7:14 PM on September 1 and the earliest sunset is 41 minutes earlier at 6:33 PM on September 30.
Daylight saving time is observed in Barstow Heights 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 5:35 AM and sets 14 hours, 30 minutes later, at 8:05 PM, while on December 21, the shortest day of the year, it rises at 6:52 AM and sets 9 hours, 49 minutes later, at 4:40 PM.
Sunrise & Sunset with Twilight in September
The chance that a given day will be muggy in Barstow Heights is essentially constant during September, remaining within 1% of 1% throughout.
For reference, on August 22, the muggiest day of the year, there are muggy conditions 1% of the time, while on January 1, the least muggy day of the year, there are muggy conditions 0% of the time.
Humidity Comfort Levels in September
The average hourly wind speed in Barstow Heights is essentially constant during September, remaining within 0.1 miles per hour of 8.1 miles per hour throughout.
For reference, on June 9, the windiest day of the year, the daily average wind speed is 10.9 miles per hour, while on January 10, the calmest day of the year, the daily average wind speed is 7.6 miles per hour.
Average Wind Speed in September
Wind Direction in September
The growing season in Barstow Heights typically lasts for 9.1 months (276 days), from around February 23 to around November 26, rarely starting before January 17 or after March 20, and rarely ending before November 8 or after December 18.
The month of September in Barstow Heights is reliably fully within the growing season.
Time Spent in Various Temperature Bands and the Growing Season in September
The average accumulated growing degree days in Barstow Heights are rapidly increasing during September, increasing by 756°F, from 4,248°F to 5,004°F, over the course of the month.
Growing Degree Days in September
The average daily incident shortwave solar energy in Barstow Heights is decreasing during September, falling by 1.1 kWh, from 7.1 kWh to 5.9 kWh, over the course of the month.
Average Daily Incident Shortwave Solar Energy in September
For the purposes of this report, the geographical coordinates of Barstow Heights are 34.870 deg latitude, -117.056 deg longitude, and 2,402 ft elevation.
The topography within 2 miles of Barstow Heights contains very significant variations in elevation, with a maximum elevation change of 948 feet and an average elevation above sea level of 2,533 feet. Within 10 miles contains very significant variations in elevation (2,083 feet). Within 50 miles contains large variations in elevation (8,885 feet).
The area within 2 miles of Barstow Heights is covered by shrubs (97%), within 10 miles by shrubs (97%), and within 50 miles by shrubs (90%).
This report illustrates the typical weather in Barstow Heights 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 Barstow Heights.
For each station, the records are corrected for the elevation difference between that station and Barstow Heights 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 Barstow Heights is computed as the weighted average of the individual contributions from each station, with weights proportional to the inverse of the distance between Barstow Heights and a given station.
The stations contributing to this reconstruction are: Barstow Daggett County Airport (61%, 25 kilometers, east); Southern California Logistics Airport (30%, 44 kilometers, southwest); and Ridgecrest Community Hospital Heliport (8%, 108 kilometers, northwest).
Time zones for aiports and weather stations are provided by AskGeo.com .