August 20 in Hyannis, through the years

Typical high: 21.7°. Hottest: 25.2° (2021). Coldest night: 16.8° (2008).

YEARHIGHLOWRAIN
2025 18.7° 17° 18.4 mm
2024 22° 18.3° 0.3 mm
2023 22.8° 20° 0 mm
2022 23.8° 21.3° 0 mm
2021 25.2° 23.7° 0 mm
2020 20.7° 19.4° 0 mm
2019 23.5° 22.7° 0 mm
2018 20.2° 19.7° 2.5 mm
2017 24.4° 21.8° 0 mm
2016 22° 21° 0 mm
2015 22.4° 20.6° 0 mm
2014 19.9° 18.6° 0 mm
2013 23.3° 20.5° 0 mm
2012 21° 20.5° 0 mm
2011 22.2° 20.6° 0 mm
2010 22.7° 20.8° 0.6 mm
2009 24.1° 22.5° 0 mm
2008 20.9° 16.8° 0 mm
2007 18.7° 17.9° 0 mm
2006 23.2° 19.1° 10.6 mm
2005 19.7° 18.2° 0 mm
2004 21.9° 20.2° 0 mm
2003 24° 21° 0 mm
2002 23° 20° 2.5 mm
2001 22.3° 20.5° 4.3 mm
2000 19.5° 16.9° 0 mm
1999 19.4° 18.1° 0 mm
1998 19° 17.5° 0 mm
1997 19.6° 18.9° 0 mm
1996 20° 18° 0 mm
Source: ERA5 reanalysis (Copernicus C3S)

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