Average Weather in September in Dunkirk Indiana, United States
In Dunkirk, the month of September is characterized by rapidly falling daily high temperatures, with daily highs decreasing by 9°F, from 79°F to 70°F over the course of the month, and rarely exceeding 87°F or dropping below 59°F.
Daily low temperatures decrease by 10°F, from 60°F to 50°F, rarely falling below 39°F or exceeding 69°F.
For reference, on July 19, the hottest day of the year, temperatures in Dunkirk typically range from 65°F to 83°F, while on January 29, the coldest day of the year, they range from 20°F to 34°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 Dunkirk 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 68% of the time.
For reference, on January 2, the cloudiest day of the year, the chance of overcast or mostly cloudy conditions is 62%, while on August 23, the clearest day of the year, the chance of clear, mostly clear, or partly cloudy skies is 69%.
Cloud Cover in September
A wet day is one with at least 0.04 inches of liquid or liquid-equivalent precipitation. In Dunkirk, the chance of a wet day over the course of September is gradually decreasing, starting the month at 29% and ending it at 25%.
For reference, the year's highest daily chance of a wet day is 41% on May 28, and its lowest chance is 18% on February 8.
Probability of Precipitation in September
The average sliding 31-day rainfall during September in Dunkirk is gradually decreasing, starting the month at 2.8 inches, when it rarely exceeds 5.1 inches or falls below 0.9 inches, and ending the month at 2.6 inches, when it rarely exceeds 4.5 inches or falls below 0.9 inches.
Average Monthly Rainfall in September
Over the course of September in Dunkirk, 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, 16 minutes, implying an average daily decrease of 2 minutes, 37 seconds, and weekly decrease of 18 minutes, 22 seconds.
The shortest day of the month is September 30, with 11 hours, 48 minutes of daylight and the longest day is September 1, with 13 hours, 4 minutes of daylight.
Hours of Daylight and Twilight in September
The earliest sunrise of the month in Dunkirk is 7:08 AM on September 1 and the latest sunrise is 28 minutes later at 7:36 AM on September 30.
The latest sunset is 8:12 PM on September 1 and the earliest sunset is 48 minutes earlier at 7:24 PM on September 30.
Daylight saving time is observed in Dunkirk 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 6:11 AM and sets 15 hours, 3 minutes later, at 9:14 PM, while on December 21, the shortest day of the year, it rises at 8:00 AM and sets 9 hours, 17 minutes later, at 5:17 PM.
Sunrise & Sunset with Twilight in September
The chance that a given day will be muggy in Dunkirk is very rapidly decreasing during September, falling from 31% to 5% over the course of the month.
For reference, on July 23, the muggiest day of the year, there are muggy conditions 51% 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 Dunkirk is gradually increasing during September, increasing from 4.2 miles per hour to 5.0 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 6.9 miles per hour, while on August 4, the calmest day of the year, the daily average wind speed is 3.8 miles per hour.
Average Wind Speed in September
Wind Direction in September
The average daily incident shortwave solar energy in Dunkirk is decreasing during September, falling by 1.3 kWh, from 5.7 kWh to 4.5 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 Dunkirk are 40.375 deg latitude, -85.209 deg longitude, and 942 ft elevation.
The topography within 2 miles of Dunkirk is essentially flat, with a maximum elevation change of 66 feet and an average elevation above sea level of 942 feet. Within 10 miles is essentially flat (200 feet). Within 50 miles contains only modest variations in elevation (620 feet).
The area within 2 miles of Dunkirk is covered by cropland (95%), within 10 miles by cropland (98%), and within 50 miles by cropland (93%).
This report illustrates the typical weather in Dunkirk 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 Dunkirk.
For each station, the records are corrected for the elevation difference between that station and Dunkirk 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 Dunkirk is computed as the weighted average of the individual contributions from each station, with weights proportional to the inverse of the distance between Dunkirk and a given station.
The stations contributing to this reconstruction are: Delaware County Regional Airport (71%, 22 kilometers, southwest); Darke County Airport (16%, 61 kilometers, east); and Fort Wayne International Airport (14%, 66 kilometers, north).
Time zones for aiports and weather stations are provided by AskGeo.com .