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Precipitation patterns have also fluctuated, with May 21, 2010 recording the highest precipitation in the past 15 years at 36.2 mm, all of which came from rainfall. Interestingly, two 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 May 21 reaching 37 mph (2013) and the highest sustained wind speed recorded at 12 mph (2013).
These historical trends suggest that the weather on May 21 in Petersburg has been quite unpredictable over the years.
Historical May 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 | 72°F | 58°F | 36.2 mm | 36.2 mm | 0 mm | 27 mph | 12 mph |
| 2011 | 82°F | 59°F | 0.4 mm | 0.4 mm | 0 mm | 21 mph | 8 mph |
| 2012 | 79°F | 63°F | 11.1 mm | 11.1 mm | 0 mm | 22 mph | 11 mph |
| 2013 | 83°F | 68°F | 0.5 mm | 0.5 mm | 0 mm | 37 mph | 12 mph |
| 2014 | 80°F | 64°F | 6.6 mm | 6.6 mm | 0 mm | 28 mph | 11 mph |
| 2015 | 58°F | 50°F | 0.2 mm | 0.2 mm | 0 mm | 22 mph | 9 mph |
| 2016 | 66°F | 56°F | 6.7 mm | 6.7 mm | 0 mm | 27 mph | 11 mph |
| 2017 | 74°F | 63°F | 8.4 mm | 8.4 mm | 0 mm | 29 mph | 11 mph |
| 2018 | 85°F | 65°F | 13.2 mm | 13.2 mm | 0 mm | 18 mph | 6 mph |
| 2019 | 69°F | 50°F | 0.7 mm | 0.7 mm | 0 mm | 25 mph | 11 mph |
| 2020 | 65°F | 53°F | 2.5 mm | 2.5 mm | 0 mm | 23 mph | 10 mph |
| 2021 | 86°F | 61°F | 0 mm | 0 mm | 0 mm | 19 mph | 7 mph |
| 2022 | 82°F | 68°F | 0.2 mm | 0.2 mm | 0 mm | 25 mph | 10 mph |
| 2023 | 74°F | 48°F | 0 mm | 0 mm | 0 mm | 13 mph | 6 mph |
| 2024 | 85°F | 64°F | 0.2 mm | 0.2 mm | 0 mm | 24 mph | 10 mph |
