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Precipitation patterns have also fluctuated, with June 30, 2012 recording the highest precipitation in the past 15 years at 17.8 mm, all of which came from rainfall. Interestingly, three 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 June 30 reaching 37 mph (2014) and the highest sustained wind speed recorded at 16 mph (2014).
These historical trends suggest that the weather on June 30 in Romeoville has been quite unpredictable over the years.
Historical June 30 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 | 75°F | 56°F | 0 mm | 0 mm | 0 mm | 17 mph | 8 mph |
| 2011 | 85°F | 62°F | 0.3 mm | 0.3 mm | 0 mm | 25 mph | 11 mph |
| 2012 | 88°F | 70°F | 17.8 mm | 17.8 mm | 0 mm | 31 mph | 8 mph |
| 2013 | 75°F | 63°F | 0.2 mm | 0.2 mm | 0 mm | 28 mph | 14 mph |
| 2014 | 86°F | 72°F | 9.7 mm | 9.7 mm | 0 mm | 37 mph | 16 mph |
| 2015 | 77°F | 58°F | 1.7 mm | 1.7 mm | 0 mm | 22 mph | 8 mph |
| 2016 | 77°F | 57°F | 1.8 mm | 1.8 mm | 0 mm | 21 mph | 10 mph |
| 2017 | 80°F | 64°F | 9.3 mm | 9.3 mm | 0 mm | 22 mph | 9 mph |
| 2018 | 90°F | 78°F | 1 mm | 1 mm | 0 mm | 26 mph | 12 mph |
| 2019 | 87°F | 69°F | 5.1 mm | 5.1 mm | 0 mm | 26 mph | 8 mph |
| 2020 | 84°F | 69°F | 10.9 mm | 10.9 mm | 0 mm | 20 mph | 9 mph |
| 2021 | 80°F | 69°F | 12.7 mm | 12.7 mm | 0 mm | 16 mph | 6 mph |
| 2022 | 90°F | 70°F | 0 mm | 0 mm | 0 mm | 29 mph | 14 mph |
| 2023 | 90°F | 68°F | 1.4 mm | 1.4 mm | 0 mm | 16 mph | 8 mph |
| 2024 | 70°F | 56°F | 0 mm | 0 mm | 0 mm | 24 mph | 12 mph |
