August 21 in Helena, through the years

Typical high: 25.8°. Hottest: 30.9° (2011). Coldest night: 5.6° (2018).

YEARHIGHLOWRAIN
2025 25.6° 9.8° 0 mm
2024 24.7° 9.7° 2.1 mm
2023 24.8° 13.4° 7.4 mm
2022 28.9° 15.9° 1.4 mm
2021 18° 9.3° 10.4 mm
2020 30.4° 10.6° 0 mm
2019 29.8° 12.2° 2.3 mm
2018 14° 5.6° 2.2 mm
2017 25.5° 7.6° 0 mm
2016 29.9° 9.9° 0 mm
2015 24.4° 9.7° 0 mm
2014 17.2° 11° 7.7 mm
2013 28.5° 8.9° 0 mm
2012 29.8° 11.8° 0.7 mm
2011 30.9° 11.2° 0 mm
2010 30.8° 8.2° 0 mm
2009 30.6° 11.3° 0 mm
2008 17.9° 8.1° 7.3 mm
2007 20.2° 8.6° 0 mm
2006 30.3° 9.3° 0.1 mm
2005 30.7° 8.5° 0 mm
2004 27.8° 10.6° 0 mm
2003 30.2° 10.8° 0 mm
2002 18.1° 9.5° 6.7 mm
2001 28.5° 11.3° 0 mm
2000 23.6° 5.6° 0 mm
1999 27.4° 12.1° 1 mm
1998 27.3° 11.4° 2.5 mm
1997 26.6° 11.6° 0 mm
1996 20.3° 6.4° 0.1 mm
Source: ERA5 reanalysis (Copernicus C3S)

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