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Precipitation patterns have also fluctuated, with Aug. 21, 2018 recording the highest precipitation in the past 15 years at 15.1 mm, all of which came from rainfall. Interestingly, seven 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. 21 reaching 38 mph (2018) and the highest sustained wind speed recorded at 14 mph (2018).
These historical trends suggest that the weather on Aug. 21 in Petersburg has been quite unpredictable over the years.
Historical Aug. 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 | 81°F | 73°F | 11.5 mm | 11.5 mm | 0 mm | 22 mph | 10 mph |
| 2011 | 87°F | 72°F | 3 mm | 3 mm | 0 mm | 25 mph | 7 mph |
| 2012 | 80°F | 61°F | 0 mm | 0 mm | 0 mm | 15 mph | 4 mph |
| 2013 | 85°F | 68°F | 1.6 mm | 1.6 mm | 0 mm | 15 mph | 5 mph |
| 2014 | 85°F | 71°F | 1.8 mm | 1.8 mm | 0 mm | 27 mph | 6 mph |
| 2015 | 78°F | 59°F | 0 mm | 0 mm | 0 mm | 12 mph | 5 mph |
| 2016 | 79°F | 67°F | 0 mm | 0 mm | 0 mm | 24 mph | 10 mph |
| 2017 | 90°F | 72°F | 0 mm | 0 mm | 0 mm | 20 mph | 7 mph |
| 2018 | 80°F | 70°F | 15.1 mm | 15.1 mm | 0 mm | 38 mph | 14 mph |
| 2019 | 90°F | 71°F | 0.3 mm | 0.3 mm | 0 mm | 23 mph | 9 mph |
| 2020 | 82°F | 64°F | 0 mm | 0 mm | 0 mm | 13 mph | 5 mph |
| 2021 | 89°F | 68°F | 0.1 mm | 0.1 mm | 0 mm | 14 mph | 4 mph |
| 2022 | 82°F | 67°F | 11.5 mm | 11.5 mm | 0 mm | 22 mph | 8 mph |
| 2023 | 93°F | 72°F | 0 mm | 0 mm | 0 mm | 11 mph | 4 mph |
| 2024 | 74°F | 55°F | 0 mm | 0 mm | 0 mm | 18 mph | 8 mph |
