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Precipitation patterns have also fluctuated, with April 20, 2021 recording the highest precipitation in the past 15 years at 6.4 mm, consisting of 0.5 mm of rainfall and 41.3 mm of snowfall. For reference, 7 mm of snowfall is generally equivalent to 1 mm of rain or total precipitation. 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 April 20 reaching 43 mph (2023) and the highest sustained wind speed recorded at 22 mph (2023).
These historical trends suggest that the weather on April 20 in Lemont has been quite unpredictable over the years.
Historical April 20 Weather in Lemont (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 | 63°F | 39°F | 0 mm | 0 mm | 0 mm | 11 mph | 5 mph |
| 2011 | 46°F | 35°F | 0 mm | 0 mm | 0 mm | 25 mph | 13 mph |
| 2012 | 62°F | 40°F | 4.8 mm | 4.8 mm | 0 mm | 32 mph | 16 mph |
| 2013 | 45°F | 32°F | 0 mm | 0 mm | 0 mm | 22 mph | 12 mph |
| 2014 | 73°F | 44°F | 0 mm | 0 mm | 0 mm | 23 mph | 9 mph |
| 2015 | 52°F | 43°F | 1.9 mm | 1.9 mm | 0 mm | 40 mph | 20 mph |
| 2016 | 71°F | 50°F | 5.2 mm | 5.2 mm | 0 mm | 23 mph | 10 mph |
| 2017 | 70°F | 49°F | 4.3 mm | 4.3 mm | 0 mm | 36 mph | 17 mph |
| 2018 | 59°F | 28°F | 0 mm | 0 mm | 0 mm | 13 mph | 7 mph |
| 2019 | 62°F | 38°F | 0 mm | 0 mm | 0 mm | 31 mph | 15 mph |
| 2020 | 59°F | 30°F | 0.9 mm | 0.9 mm | 0 mm | 36 mph | 18 mph |
| 2021 | 38°F | 29°F | 6.4 mm | 0.5 mm | 41.3 mm | 15 mph | 6 mph |
| 2022 | 51°F | 38°F | 5.6 mm | 5.6 mm | 0 mm | 36 mph | 19 mph |
| 2023 | 77°F | 48°F | 3.4 mm | 3.4 mm | 0 mm | 43 mph | 22 mph |
| 2024 | 44°F | 34°F | 0 mm | 0 mm | 0 mm | 26 mph | 13 mph |
