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Precipitation patterns have also fluctuated, with March 21, 2018 recording the highest precipitation in the past 15 years at 7.4 mm, all of which came from snowfall. For reference, 7 mm of snowfall is generally equivalent to 1 mm of rain or total precipitation. Interestingly, 10 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 March 21 reaching 33 mph (2018) and the highest sustained wind speed recorded at 14 mph (2011).
These historical trends suggest that the weather on March 21 in Petersburg has been quite unpredictable over the years.
Historical March 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 | 67°F | 45°F | 3.1 mm | 3.1 mm | 0 mm | 22 mph | 12 mph |
| 2011 | 76°F | 62°F | 0.4 mm | 0.4 mm | 0 mm | 31 mph | 14 mph |
| 2012 | 83°F | 59°F | 0 mm | 0 mm | 0 mm | 13 mph | 7 mph |
| 2013 | 33°F | 22°F | 0 mm | 0 mm | 0 mm | 23 mph | 10 mph |
| 2014 | 67°F | 34°F | 0 mm | 0 mm | 0 mm | 25 mph | 12 mph |
| 2015 | 64°F | 40°F | 0 mm | 0 mm | 0 mm | 25 mph | 10 mph |
| 2016 | 53°F | 31°F | 0 mm | 0 mm | 0 mm | 25 mph | 11 mph |
| 2017 | 59°F | 42°F | 0 mm | 0 mm | 0 mm | 23 mph | 11 mph |
| 2018 | 35°F | 22°F | 7.4 mm | 0 mm | 51.8 mm | 33 mph | 13 mph |
| 2019 | 48°F | 41°F | 5.7 mm | 5.7 mm | 0 mm | 29 mph | 13 mph |
| 2020 | 42°F | 31°F | 0 mm | 0 mm | 0 mm | 24 mph | 10 mph |
| 2021 | 63°F | 34°F | 0 mm | 0 mm | 0 mm | 13 mph | 7 mph |
| 2022 | 68°F | 41°F | 0 mm | 0 mm | 0 mm | 19 mph | 8 mph |
| 2023 | 55°F | 30°F | 0.7 mm | 0.7 mm | 0 mm | 22 mph | 10 mph |
| 2024 | 45°F | 25°F | 0 mm | 0 mm | 0 mm | 18 mph | 8 mph |
