Average Weather in September in Marcellus Michigan, United States
Daily high temperatures decrease by 11°F, from 77°F to 67°F, rarely falling below 55°F or exceeding 86°F.
Daily low temperatures decrease by 10°F, from 59°F to 48°F, rarely falling below 38°F or exceeding 68°F.
For reference, on July 19, the hottest day of the year, temperatures in Marcellus typically range from 63°F to 82°F, while on January 29, the coldest day of the year, they range from 19°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 Marcellus experiences gradually increasing cloud cover, with the percentage of time that the sky is overcast or mostly cloudy increasing from 32% to 37%.
The clearest day of the month is September 1, with clear, mostly clear, or partly cloudy conditions 68% of the time.
For reference, on December 29, the cloudiest day of the year, the chance of overcast or mostly cloudy conditions is 67%, 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 Marcellus, the chance of a wet day over the course of September is essentially constant, remaining around 32% throughout.
For reference, the year's highest daily chance of a wet day is 36% on July 22, and its lowest chance is 17% on February 8.
Probability of Precipitation in September
The average sliding 31-day rainfall during September in Marcellus is essentially constant, remaining about 3.2 inches throughout, and rarely exceeding 5.3 inches or falling below 1.2 inches.
Average Monthly Rainfall in September
Over the course of September in Marcellus, 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, 21 minutes, implying an average daily decrease of 2 minutes, 47 seconds, and weekly decrease of 19 minutes, 28 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, 8 minutes of daylight.
Hours of Daylight and Twilight in September
The earliest sunrise of the month in Marcellus is 7:08 AM on September 1 and the latest sunrise is 30 minutes later at 7:39 AM on September 30.
The latest sunset is 8:16 PM on September 1 and the earliest sunset is 50 minutes earlier at 7:26 PM on September 30.
Daylight saving time is observed in Marcellus 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 6:07 AM and sets 15 hours, 15 minutes later, at 9:22 PM, while on December 21, the shortest day of the year, it rises at 8:08 AM and sets 9 hours, 7 minutes later, at 5:14 PM.
Sunrise & Sunset with Twilight in September
The chance that a given day will be muggy in Marcellus is very rapidly decreasing during September, falling from 25% to 4% over the course of the month.
For reference, on July 28, the muggiest day of the year, there are muggy conditions 39% 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 Marcellus is increasing during September, increasing from 8.6 miles per hour to 10.2 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 13.2 miles per hour, while on August 4, the calmest day of the year, the daily average wind speed is 7.9 miles per hour.
Average Wind Speed in September
Wind Direction in September
Marcellus 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 Marcellus 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 Marcellus typically lasts for 5.7 months (175 days), from around April 26 to around October 17, rarely starting before April 8 or after May 15, and rarely ending before September 28 or after November 7.
The month of September in Marcellus 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 87% 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 Marcellus are increasing during September, increasing by 385°F, from 2,320°F to 2,705°F, over the course of the month.
Growing Degree Days in September
The average daily incident shortwave solar energy in Marcellus is decreasing during September, falling by 1.3 kWh, from 5.6 kWh to 4.2 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 Marcellus are 42.026 deg latitude, -85.816 deg longitude, and 889 ft elevation.
The topography within 2 miles of Marcellus is essentially flat, with a maximum elevation change of 92 feet and an average elevation above sea level of 885 feet. Within 10 miles is essentially flat (410 feet). Within 50 miles contains only modest variations in elevation (617 feet).
The area within 2 miles of Marcellus is covered by cropland (82%) and trees (18%), within 10 miles by cropland (60%) and trees (36%), and within 50 miles by cropland (59%) and trees (21%).
This report illustrates the typical weather in Marcellus 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 Marcellus.
For each station, the records are corrected for the elevation difference between that station and Marcellus 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 Marcellus is computed as the weighted average of the individual contributions from each station, with weights proportional to the inverse of the distance between Marcellus and a given station.
The stations contributing to this reconstruction are: Hree Rivers Municipal Dr Haines Airport (46%, 20 kilometers, east); Kalamazoo-Battle Creek International Airport (22%, 32 kilometers, northeast); South Haven Area Regional Airport (11%, 51 kilometers, northwest); Ross Field-Twin Cities Airport (11%, 52 kilometers, west); and Michigan City Municipal Airport-Phillips Field (10%, 53 kilometers, southwest).
Time zones for aiports and weather stations are provided by AskGeo.com .