August 21 in Alton, through the years

Typical high: 29.4°. Hottest: 36.7° (2003). Coldest night: 14.2° (2015).

YEARHIGHLOWRAIN
2025 25.5° 18.2° 0.1 mm
2024 23.5° 14.9° 0 mm
2023 33.4° 25.9° 0.7 mm
2022 26.4° 18.9° 0.2 mm
2021 28.8° 23.3° 8.3 mm
2020 27.5° 15.6° 0 mm
2019 30.8° 21.3° 13 mm
2018 26.2° 20.7° 0.7 mm
2017 30.1° 22.2° 6.7 mm
2016 25.7° 16.7° 0 mm
2015 27.5° 14.2° 0 mm
2014 32.7° 23.2° 0.1 mm
2013 31.5° 18.5° 0 mm
2012 31° 16.6° 0 mm
2011 30.3° 21° 5.3 mm
2010 29.8° 22.5° 17 mm
2009 25.4° 17.9° 0.4 mm
2008 27° 20.2° 19.1 mm
2007 33.6° 23.6° 2.6 mm
2006 29.3° 19.6° 0 mm
2005 32.5° 22.4° 0 mm
2004 26.1° 14.5° 0 mm
2003 36.7° 24.8° 0 mm
2002 33.2° 22.8° 0 mm
2001 32.8° 20.1° 0 mm
2000 29° 18.3° 0.2 mm
1999 27.1° 14.2° 0 mm
1998 31° 17.8° 0 mm
1997 23.8° 15.1° 0 mm
1996 32.8° 22.8° 0 mm
Source: ERA5 reanalysis (Copernicus C3S)

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