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Precipitation patterns have also fluctuated, with Sept. 18, 2015 recording the highest precipitation in the past 15 years at 30.9 mm, all of which came from rainfall. Interestingly, nine years out of the last 15 years had no measurable precipitation on this date.
Wind speeds have varied as well, with the strongest gust on Sept. 18 reaching 31 mph (2015) and the highest sustained wind speed recorded at 14 mph (2012).
These historical trends suggest that the weather on Sept. 18 in Bourbonnais has been quite unpredictable over the years.
Historical Sept. 18 Weather in Bourbonnais (Last 15 Years)
| Year | High Temp (°F) | Low Temp (°F) | Precipitation (mm) | Rain (mm) | Snowfall (mm) | Strongest Wind Gust (mph) | Max Wind Speed (mph) |
|---|---|---|---|---|---|---|---|
| 2010 | 76°F | 60°F | 0.8 mm | 0.8 mm | 0 mm | 22 mph | 10 mph |
| 2011 | 68°F | 56°F | 12.4 mm | 12.4 mm | 0 mm | 25 mph | 13 mph |
| 2012 | 62°F | 48°F | 0 mm | 0 mm | 0 mm | 31 mph | 14 mph |
| 2013 | 83°F | 58°F | 0 mm | 0 mm | 0 mm | 22 mph | 11 mph |
| 2014 | 70°F | 46°F | 0 mm | 0 mm | 0 mm | 19 mph | 9 mph |
| 2015 | 81°F | 69°F | 30.9 mm | 30.9 mm | 0 mm | 31 mph | 13 mph |
| 2016 | 78°F | 61°F | 0 mm | 0 mm | 0 mm | 10 mph | 5 mph |
| 2017 | 82°F | 61°F | 0.1 mm | 0.1 mm | 0 mm | 23 mph | 13 mph |
| 2018 | 86°F | 68°F | 0.2 mm | 0.2 mm | 0 mm | 21 mph | 10 mph |
| 2019 | 82°F | 61°F | 0 mm | 0 mm | 0 mm | 16 mph | 8 mph |
| 2020 | 61°F | 47°F | 0 mm | 0 mm | 0 mm | 27 mph | 14 mph |
| 2021 | 81°F | 67°F | 0 mm | 0 mm | 0 mm | 17 mph | 10 mph |
| 2022 | 86°F | 67°F | 0 mm | 0 mm | 0 mm | 25 mph | 13 mph |
| 2023 | 70°F | 50°F | 0.4 mm | 0.4 mm | 0 mm | 17 mph | 7 mph |
| 2024 | 85°F | 58°F | 0 mm | 0 mm | 0 mm | 15 mph | 9 mph |
