Average Weather in September in Constantine Michigan, United States
In Constantine, the month of September is characterized by rapidly falling daily high temperatures, with daily highs decreasing by 10°F, from 78°F to 68°F over the course of the month, and rarely exceeding 87°F or dropping below 56°F.
Daily low temperatures decrease by 10°F, from 59°F to 49°F, rarely falling below 38°F or exceeding 68°F.
For reference, on July 19, the hottest day of the year, temperatures in Constantine typically range from 63°F to 83°F, while on January 29, the coldest day of the year, they range from 18°F to 31°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 Constantine experiences essentially constant cloud cover, with the percentage of time that the sky is overcast or mostly cloudy remaining about 34% throughout the month.
The clearest day of the month is September 1, with clear, mostly clear, or partly cloudy conditions 67% of the time.
For reference, on January 26, the cloudiest day of the year, the chance of overcast or mostly cloudy conditions is 66%, while on August 26, the clearest day of the year, the chance of clear, mostly clear, or partly cloudy skies is 68%.
Cloud Cover Categories in September
A wet day is one with at least 0.04 inches of liquid or liquid-equivalent precipitation. In Constantine, the chance of a wet day over the course of September is gradually decreasing, starting the month at 33% and ending it at 30%.
For reference, the year's highest daily chance of a wet day is 37% on July 22, and its lowest chance is 16% on February 4.
Probability of Precipitation in September
The average sliding 31-day rainfall during September in Constantine is essentially constant, remaining about 3.1 inches throughout, and rarely exceeding 5.1 inches or falling below 1.2 inches.
Average Monthly Rainfall in September
Over the course of September in Constantine, 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, 20 minutes, implying an average daily decrease of 2 minutes, 46 seconds, and weekly decrease of 19 minutes, 21 seconds.
The shortest day of the month is September 30, with 11 hours, 47 minutes of daylight and the longest day is September 1, with 13 hours, 7 minutes of daylight.
Hours of Daylight and Twilight in September
The earliest sunrise of the month in Constantine is 7:08 AM on September 1 and the latest sunrise is 30 minutes later at 7:38 AM on September 30.
The latest sunset is 8:15 PM on September 1 and the earliest sunset is 50 minutes earlier at 7:25 PM on September 30.
Daylight saving time is observed in Constantine during 2017, 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 6:07 AM and sets 15 hours, 13 minutes later, at 9:21 PM, while on December 21, the shortest day of the year, it rises at 8:06 AM and sets 9 hours, 8 minutes later, at 5:14 PM.
Sunrise & Sunset with Twilight in September
The chance that a given day will be muggy in Constantine is very rapidly decreasing during September, falling from 27% to 4% over the course of the month.
For reference, on July 26, the muggiest day of the year, there are muggy conditions 41% of the time, while on November 16, 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 Constantine is increasing during September, increasing from 8.3 miles per hour to 9.8 miles per hour over the course of the month.
For reference, on January 15, the windiest day of the year, the daily average wind speed is 12.8 miles per hour, while on August 4, the calmest day of the year, the daily average wind speed is 7.7 miles per hour.
Average Wind Speed in September
Wind Direction in September
Constantine 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 Constantine is rapidly decreasing during September, falling by 7°F, from 71°F to 63°F, over the course of the month.
Average Water Temperature in September
The growing season in Constantine typically lasts for 5.9 months (178 days), from around April 23 to around October 19, rarely starting before April 6 or after May 12, and rarely ending before September 29 or after November 7.
The month of September in Constantine is more likely than not fully within the growing season, with the chance that a given day is in the growing season decreasing from 100% to 89% over the course of the month.
Time Spent in Various Temperature Bands and the Growing Season in September
The average accumulated growing degree days in Constantine is increasing during September, increasing by 398°F, from 2,399°F to 2,797°F, over the course of the month.
Growing Degree Days in September
The average daily incident shortwave solar energy in Constantine is decreasing during September, falling by 1.3 kWh, from 5.6 kWh to 4.3 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 Constantine are 41.841 deg latitude, -85.669 deg longitude, and 804 ft elevation.
The topography within 2 miles of Constantine is essentially flat, with a maximum elevation change of 56 feet and an average elevation above sea level of 797 feet. Within 10 miles is essentially flat (381 feet). Within 50 miles contains only modest variations in elevation (653 feet).
The area within 2 miles of Constantine is covered by cropland (90%), within 10 miles by cropland (71%) and trees (20%), and within 50 miles by cropland (71%) and trees (18%).
This report illustrates the typical weather in Constantine 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 5 weather stations near enough to contribute to our estimation of the temperature and dew point in Constantine.
For each station, the records are corrected for the elevation difference between that station and Constantine 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 Constantine is computed as the weighted average of the individual contributions from each station, with weights proportional to the inverse of the distance between Constantine and a given station.
The stations contributing to this reconstruction are: Hree Rivers Municipal Dr Haines Airport (47%, 15 kilometers, northeast); Kirsch Municipal Airport (29%, 20 kilometers, east); Goshen Municipal Airport (12%, 36 kilometers, south); Michigan City Municipal Airport-Phillips Field (7%, 53 kilometers, west); and Ross Field-Twin Cities Airport (4.4%, 70 kilometers, northwest).
Time zones for aiports and weather stations are provided by AskGeo.com .