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Precipitation patterns have also fluctuated, with July 20, 2018 recording the highest precipitation in the past 15 years at 23.7 mm, all of which came from rainfall. Interestingly, six 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 July 20 reaching 36 mph (2022) and the highest sustained wind speed recorded at 18 mph (2022).
These historical trends suggest that the weather on July 20 in Romeoville has been quite unpredictable over the years.
Historical July 20 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 | 82°F | 69°F | 6.7 mm | 6.7 mm | 0 mm | 18 mph | 8 mph |
| 2011 | 97°F | 78°F | 0 mm | 0 mm | 0 mm | 26 mph | 12 mph |
| 2012 | 82°F | 68°F | 0.1 mm | 0.1 mm | 0 mm | 25 mph | 11 mph |
| 2013 | 86°F | 73°F | 0 mm | 0 mm | 0 mm | 15 mph | 8 mph |
| 2014 | 80°F | 60°F | 0 mm | 0 mm | 0 mm | 15 mph | 6 mph |
| 2015 | 83°F | 62°F | 0.6 mm | 0.6 mm | 0 mm | 19 mph | 9 mph |
| 2016 | 88°F | 71°F | 0 mm | 0 mm | 0 mm | 18 mph | 7 mph |
| 2017 | 89°F | 70°F | 20.6 mm | 20.6 mm | 0 mm | 29 mph | 13 mph |
| 2018 | 76°F | 67°F | 23.7 mm | 23.7 mm | 0 mm | 31 mph | 15 mph |
| 2019 | 92°F | 75°F | 0.6 mm | 0.6 mm | 0 mm | 31 mph | 15 mph |
| 2020 | 83°F | 68°F | 0 mm | 0 mm | 0 mm | 15 mph | 7 mph |
| 2021 | 86°F | 63°F | 0.1 mm | 0.1 mm | 0 mm | 25 mph | 10 mph |
| 2022 | 87°F | 75°F | 0.1 mm | 0.1 mm | 0 mm | 36 mph | 18 mph |
| 2023 | 85°F | 66°F | 0.5 mm | 0.5 mm | 0 mm | 30 mph | 14 mph |
| 2024 | 79°F | 58°F | 0 mm | 0 mm | 0 mm | 15 mph | 7 mph |
