September 1 in Keystone, through the years

Typical high: 19.5°. Hottest: 26.6° (2019). Coldest night: 2.7° (2010).

YEARHIGHLOWRAIN
2025 22.3° 5.5° 0.1 mm
2024 20.6° 1.6 mm
2023 21.9° 9.9° 0.2 mm
2022 23.7° 7.5° 0 mm
2021 12.9° 9.4° 14.9 mm
2020 16.9° 3.7° 2.9 mm
2019 26.6° 7.5° 0.1 mm
2018 16.4° 2.2 mm
2017 21.6° 7.8° 0 mm
2016 18.7° 0 mm
2015 19.9° 6.1° 2.1 mm
2014 20.7° 4.3° 0 mm
2013 21.3° 9.1° 1 mm
2012 21.1° 7.7° 0.1 mm
2011 21.9° 0.6 mm
2010 19.5° 2.7° 0 mm
2009 19.9° 0.8 mm
2008 17.4° 7.8° 0.3 mm
2007 21° 7.5° 0 mm
2006 19° 6.2° 0.3 mm
2005 18.9° 3.2° 0 mm
2004 21° 5.3° 0 mm
2003 22° 4.5° 0 mm
2002 19.7° 6.2° 0 mm
2001 18.4° 4.1° 0.5 mm
2000 15.8° 4.3° 2 mm
1999 13.5° 6.2° 12.8 mm
1998 15.2° 6.2° 12.3 mm
1997 17.1° 5.9° 13.7 mm
1996 21.5° 7.8° 0 mm
Source: ERA5 reanalysis (Copernicus C3S)

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