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Precipitation patterns have also fluctuated, with July 21, 2019 recording the highest precipitation in the past 15 years at 20.5 mm, all of which came from rainfall. Interestingly, five 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 21 reaching 33 mph (2018) and the highest sustained wind speed recorded at 16 mph (2018).
These historical trends suggest that the weather on July 21 in Romeoville has been quite unpredictable over the years.
Historical July 21 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 | 86°F | 71°F | 0 mm | 0 mm | 0 mm | 12 mph | 6 mph |
| 2011 | 96°F | 80°F | 0.2 mm | 0.2 mm | 0 mm | 25 mph | 11 mph |
| 2012 | 88°F | 64°F | 0 mm | 0 mm | 0 mm | 14 mph | 4 mph |
| 2013 | 86°F | 68°F | 0.4 mm | 0.4 mm | 0 mm | 18 mph | 10 mph |
| 2014 | 84°F | 60°F | 0 mm | 0 mm | 0 mm | 18 mph | 7 mph |
| 2015 | 79°F | 64°F | 0 mm | 0 mm | 0 mm | 17 mph | 9 mph |
| 2016 | 91°F | 75°F | 3.3 mm | 3.3 mm | 0 mm | 28 mph | 14 mph |
| 2017 | 88°F | 73°F | 14 mm | 14 mm | 0 mm | 22 mph | 9 mph |
| 2018 | 78°F | 67°F | 10.8 mm | 10.8 mm | 0 mm | 33 mph | 16 mph |
| 2019 | 78°F | 68°F | 20.5 mm | 20.5 mm | 0 mm | 23 mph | 10 mph |
| 2020 | 81°F | 69°F | 3.5 mm | 3.5 mm | 0 mm | 18 mph | 8 mph |
| 2021 | 77°F | 64°F | 0.8 mm | 0.8 mm | 0 mm | 21 mph | 7 mph |
| 2022 | 86°F | 67°F | 1.5 mm | 1.5 mm | 0 mm | 25 mph | 13 mph |
| 2023 | 80°F | 63°F | 1 mm | 1 mm | 0 mm | 16 mph | 7 mph |
| 2024 | 82°F | 61°F | 0 mm | 0 mm | 0 mm | 12 mph | 6 mph |
