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Precipitation patterns remained nearly unchanged, with Aug. 18, 2015 recording the highest precipitation in the past 15 years at 12.1 mm, all of which came from rainfall. Interestingly, four 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. 18 reaching 31 mph (2015) and the highest sustained wind speed recorded at 13 mph (2019).
These historical trends suggest that the weather on Aug. 18 in Romeoville has been somewhat predictable over the years.
Historical Aug. 18 Weather in Romeoville (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 | 81°F | 62°F | 0.9 mm | 0.9 mm | 0 mm | 13 mph | 4 mph |
| 2011 | 85°F | 65°F | 0.1 mm | 0.1 mm | 0 mm | 12 mph | 5 mph |
| 2012 | 75°F | 55°F | 0 mm | 0 mm | 0 mm | 13 mph | 5 mph |
| 2013 | 81°F | 56°F | 0 mm | 0 mm | 0 mm | 15 mph | 6 mph |
| 2014 | 81°F | 63°F | 0.7 mm | 0.7 mm | 0 mm | 15 mph | 6 mph |
| 2015 | 82°F | 67°F | 12.1 mm | 12.1 mm | 0 mm | 31 mph | 13 mph |
| 2016 | 84°F | 70°F | 3.2 mm | 3.2 mm | 0 mm | 21 mph | 9 mph |
| 2017 | 80°F | 66°F | 0.1 mm | 0.1 mm | 0 mm | 24 mph | 11 mph |
| 2018 | 80°F | 68°F | 0.1 mm | 0.1 mm | 0 mm | 18 mph | 8 mph |
| 2019 | 82°F | 67°F | 3.1 mm | 3.1 mm | 0 mm | 29 mph | 13 mph |
| 2020 | 75°F | 61°F | 0 mm | 0 mm | 0 mm | 23 mph | 10 mph |
| 2021 | 83°F | 69°F | 1.7 mm | 1.7 mm | 0 mm | 17 mph | 7 mph |
| 2022 | 81°F | 60°F | 0.3 mm | 0.3 mm | 0 mm | 15 mph | 7 mph |
| 2023 | 76°F | 56°F | 0 mm | 0 mm | 0 mm | 13 mph | 6 mph |
| 2024 | 77°F | 65°F | 1.7 mm | 1.7 mm | 0 mm | 23 mph | 11 mph |
