Average Weather in September in Caledonia Michigan, United States
In Caledonia, the month of September is characterized by rapidly falling daily high temperatures, with daily highs decreasing by 11°F, from 77°F to 66°F over the course of the month, and rarely exceeding 86°F or dropping below 55°F.
Daily low temperatures decrease by 11°F, from 59°F to 48°F, rarely falling below 38°F or exceeding 69°F.
For reference, on July 19, the hottest day of the year, temperatures in Caledonia typically range from 64°F to 83°F, while on January 29, the coldest day of the year, they range from 18°F to 30°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 Caledonia experiences gradually increasing cloud cover, with the percentage of time that the sky is overcast or mostly cloudy increasing from 33% to 38%.
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 8, the cloudiest day of the year, the chance of overcast or mostly cloudy conditions is 69%, while on August 7, 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 Caledonia, 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 34% on May 24, and its lowest chance is 17% on February 4.
Probability of Precipitation in September
The average sliding 31-day rainfall during September in Caledonia is essentially constant, remaining about 3.1 inches throughout, and rarely exceeding 5.8 inches or falling below 1.3 inches.
The highest average 31-day accumulation is 3.2 inches on September 22.
Average Monthly Rainfall in September
Over the course of September in Caledonia, 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, 23 minutes, implying an average daily decrease of 2 minutes, 51 seconds, and weekly decrease of 19 minutes, 60 seconds.
The shortest day of the month is September 30, with 11 hours, 46 minutes of daylight and the longest day is September 1, with 13 hours, 9 minutes of daylight.
Hours of Daylight and Twilight in September
The earliest sunrise of the month in Caledonia is 7:07 AM on September 1 and the latest sunrise is 31 minutes later at 7:38 AM on September 30.
The latest sunset is 8:16 PM on September 1 and the earliest sunset is 51 minutes earlier at 7:24 PM on September 30.
Daylight saving time is observed in Caledonia 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 6:03 AM and sets 15 hours, 20 minutes later, at 9:24 PM, while on December 21, the shortest day of the year, it rises at 8:09 AM and sets 9 hours, 2 minutes later, at 5:11 PM.
Sunrise & Sunset with Twilight in September
The chance that a given day will be muggy in Caledonia is rapidly decreasing during September, falling from 22% to 4% over the course of the month.
For reference, on July 28, the muggiest day of the year, there are muggy conditions 35% 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 Caledonia is increasing during September, increasing from 8.4 miles per hour to 9.9 miles per hour over the course of the month.
For reference, on January 12, the windiest day of the year, the daily average wind speed is 12.5 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
Caledonia 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 Caledonia is decreasing during September, falling by 7°F, from 70°F to 63°F, over the course of the month.
Average Water Temperature in September
The average daily incident shortwave solar energy in Caledonia is decreasing during September, falling by 1.4 kWh, from 5.5 kWh to 4.1 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 Caledonia are 42.789 deg latitude, -85.517 deg longitude, and 791 ft elevation.
The topography within 2 miles of Caledonia contains only modest variations in elevation, with a maximum elevation change of 151 feet and an average elevation above sea level of 785 feet. Within 10 miles also contains only modest variations in elevation (387 feet). Within 50 miles contains only modest variations in elevation (554 feet).
The area within 2 miles of Caledonia is covered by cropland (76%), trees (14%), and artificial surfaces (10%), within 10 miles by cropland (54%) and trees (25%), and within 50 miles by cropland (52%) and trees (27%).
This report illustrates the typical weather in Caledonia 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 Caledonia.
For each station, the records are corrected for the elevation difference between that station and Caledonia 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 Caledonia is computed as the weighted average of the individual contributions from each station, with weights proportional to the inverse of the distance between Caledonia and a given station.
The stations contributing to this reconstruction are: Gerald R. Ford International Airport (76%, 10 kilometers, north); West Michigan Regional Airport (8%, 48 kilometers, west); W K Kellogg Airport (6%, 58 kilometers, south); Kalamazoo-Battle Creek International Airport (5%, 62 kilometers, south); and Fitch H Beach Airport (5%, 63 kilometers, east).
Time zones for aiports and weather stations are provided by AskGeo.com .