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Precipitation patterns have also fluctuated, with Sept. 21, 2013 recording the highest precipitation in the past 15 years at 20.3 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 Sept. 21, 2014 and Sept. 21, 2018 reaching 36.5 mph and the highest sustained wind speed recorded on Sept. 21, 2014 at 16.6 mph.
These historical trends suggest that the weather on Sept. 21 in Petersburg has been quite unpredictable over the years.
Historical Sept. 21 Weather in Petersburg (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 | 92°F | 67°F | 0 mm | 0 mm | 0 mm | 19 mph | 9.3 mph |
| 2011 | 75°F | 65°F | 10.2 mm | 10.2 mm | 0 mm | 21.3 mph | 7.1 mph |
| 2012 | 75°F | 58°F | 3.7 mm | 3.7 mm | 0 mm | 29.5 mph | 13.6 mph |
| 2013 | 71°F | 60°F | 20.3 mm | 20.3 mm | 0 mm | 24.6 mph | 9.9 mph |
| 2014 | 77°F | 59°F | 0.3 mm | 0.3 mm | 0 mm | 36.5 mph | 16.6 mph |
| 2015 | 75°F | 55°F | 0 mm | 0 mm | 0 mm | 15.2 mph | 6.9 mph |
| 2016 | 88°F | 65°F | 0 mm | 0 mm | 0 mm | 13.9 mph | 5.5 mph |
| 2017 | 86°F | 66°F | 3.3 mm | 3.3 mm | 0 mm | 10.5 mph | 4.5 mph |
| 2018 | 86°F | 71°F | 8.2 mm | 8.2 mm | 0 mm | 36.5 mph | 13.4 mph |
| 2019 | 86°F | 69°F | 0.3 mm | 0.3 mm | 0 mm | 19.7 mph | 7.6 mph |
| 2020 | 72°F | 50°F | 0 mm | 0 mm | 0 mm | 13.9 mph | 7.2 mph |
| 2021 | 77°F | 67°F | 8.6 mm | 8.6 mm | 0 mm | 23.2 mph | 10.4 mph |
| 2022 | 92°F | 69°F | 0.3 mm | 0.3 mm | 0 mm | 21 mph | 9 mph |
| 2023 | 82°F | 60°F | 0 mm | 0 mm | 0 mm | 11.6 mph | 6.3 mph |
| 2024 | 91°F | 68°F | 2.6 mm | 2.6 mm | 0 mm | 20.6 mph | 7.3 mph |
