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Precipitation patterns have also fluctuated, with July 21, 2018 recording the highest precipitation in the past 15 years at 13.2 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 July 21, 2010 and July 21, 2018 reaching 25.5 mph and the highest sustained wind speed recorded on July 21, 2018 at 10.2 mph.
These historical trends suggest that the weather on July 21 in Petersburg has been quite unpredictable over the years.
Historical July 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 | 86°F | 73°F | 5.4 mm | 5.4 mm | 0 mm | 25.5 mph | 7.5 mph |
| 2011 | 97°F | 78°F | 2.1 mm | 2.1 mm | 0 mm | 16.8 mph | 6.1 mph |
| 2012 | 85°F | 66°F | 0 mm | 0 mm | 0 mm | 15.4 mph | 6.5 mph |
| 2013 | 83°F | 71°F | 4.3 mm | 4.3 mm | 0 mm | 13.7 mph | 4.3 mph |
| 2014 | 85°F | 65°F | 0 mm | 0 mm | 0 mm | 10.1 mph | 4.1 mph |
| 2015 | 83°F | 70°F | 2 mm | 2 mm | 0 mm | 20.1 mph | 8.7 mph |
| 2016 | 90°F | 71°F | 0 mm | 0 mm | 0 mm | 13.7 mph | 4.8 mph |
| 2017 | 88°F | 75°F | 11 mm | 11 mm | 0 mm | 18.1 mph | 7 mph |
| 2018 | 77°F | 67°F | 13.2 mm | 13.2 mm | 0 mm | 25.5 mph | 10.2 mph |
| 2019 | 93°F | 76°F | 3.3 mm | 3.3 mm | 0 mm | 21.3 mph | 7.8 mph |
| 2020 | 91°F | 71°F | 0.3 mm | 0.3 mm | 0 mm | 16.5 mph | 5.9 mph |
| 2021 | 83°F | 67°F | 0 mm | 0 mm | 0 mm | 20.6 mph | 7.6 mph |
| 2022 | 90°F | 70°F | 0 mm | 0 mm | 0 mm | 19.9 mph | 7.8 mph |
| 2023 | 80°F | 66°F | 0 mm | 0 mm | 0 mm | 19.9 mph | 7.9 mph |
| 2024 | 84°F | 65°F | 0 mm | 0 mm | 0 mm | 12.1 mph | 6.3 mph |
