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Precipitation patterns have also fluctuated, with Aug. 21, 2018 recording the highest precipitation in the past 15 years at 25.3 mm, all of which came from rainfall. Interestingly, eight 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 Aug. 21 reaching 32 mph (2018) and the highest sustained wind speed recorded at 16 mph (2018).
These historical trends suggest that the weather on Aug. 21 in Lemont has been quite unpredictable over the years.
Historical Aug. 21 Weather in Lemont (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 | 83°F | 71°F | 6.8 mm | 6.8 mm | 0 mm | 20 mph | 8 mph |
| 2011 | 79°F | 64°F | 0 mm | 0 mm | 0 mm | 20 mph | 9 mph |
| 2012 | 77°F | 56°F | 0 mm | 0 mm | 0 mm | 14 mph | 6 mph |
| 2013 | 87°F | 67°F | 0 mm | 0 mm | 0 mm | 23 mph | 11 mph |
| 2014 | 83°F | 69°F | 10.5 mm | 10.5 mm | 0 mm | 19 mph | 7 mph |
| 2015 | 79°F | 57°F | 0 mm | 0 mm | 0 mm | 19 mph | 9 mph |
| 2016 | 72°F | 60°F | 0 mm | 0 mm | 0 mm | 25 mph | 11 mph |
| 2017 | 87°F | 69°F | 15.3 mm | 15.3 mm | 0 mm | 21 mph | 9 mph |
| 2018 | 78°F | 64°F | 25.3 mm | 25.3 mm | 0 mm | 32 mph | 16 mph |
| 2019 | 83°F | 63°F | 0.5 mm | 0.5 mm | 0 mm | 27 mph | 12 mph |
| 2020 | 84°F | 60°F | 0 mm | 0 mm | 0 mm | 13 mph | 6 mph |
| 2021 | 84°F | 71°F | 9 mm | 9 mm | 0 mm | 24 mph | 11 mph |
| 2022 | 78°F | 64°F | 4.2 mm | 4.2 mm | 0 mm | 21 mph | 9 mph |
| 2023 | 82°F | 65°F | 0 mm | 0 mm | 0 mm | 20 mph | 9 mph |
| 2024 | 75°F | 53°F | 0 mm | 0 mm | 0 mm | 18 mph | 8 mph |
