Henry temperature 1993 - -40.4 -50.6 -56.5 -55.7 -58.7 -57.8 - - - -35.9 -26.1 1994 -25.8 -41.2 -51.9 -55.6 -56.9 -53.1 -58.2 - - - -35.8 -26.2 1995 -28.3 -38.6 -50.1 -56.4 -58.1 -56.1 -53.0 -59.5 - - -35.6 -23.8 1996 -27.1 -35.9 -54.2 -54.1 -59.5 -58.4 -53.4 -51.6 - - -33.4 -23.3 1997 -26.4 -40.4 -52.2 -55.4 -57.2 -55.1 -63.7 -58.3 - - -32.0 -24.2 1998 -25.2 -36.1 -51.4 -60.2 -56.8 -54.8 -57.3 -60.4 - - -35.1 -25.1 1999 -23.4 -38.5 -53.2 -58.8 -56.2 -56.3 -60.3 -55.0 - - -36.7 -27.8 2000 -27.1 -40.6 -54.1 -59.9 -57.8 -57.2 -59.7 -59.0 - - -31.5 -24.1 2001 -25.6 -38.6 -53.8 -57.6 -56.9 -55.3 -58.1 -61.4 - - -32.3 -23.6 2002 -23.4 -38.3 -47.7 -52.2 -54.1 -58.8 -52.9 -55.7 - - -36.5 -27.0 2003 -24.7 -37.1 -50.8 -56.1 -58.5 -61.0 -61.6 - - -49.5 -35.0 -21.9 2004 -23.9 -35.6 -52.5 -53.5 -57.3 -60.3 -64.9 - - - -36.5 -21.8 2005 -22.6 -37.4 -50.5 -53.2 -57.7 -56.8 -60.5 - - - -36.1 -21.3 2006 -25.0 -40.4 -53.6 -55.0 -55.4 -56.6 -64.1 - - - -34.3 - 2007 -24.1 -38.8 -54.7 -59.7 -52.4 -51.1 -56.6 - - - -35.2 -24.9 2008 - -38.8 -50.7 -53.0 -57.5 -59.1 -54.6 -58.7 -53.5 -49.3 -35.3 -23.5 2009 -24.1 -38.9 -50.7 -57.6 -49.4 -53.1 -55.8 -59.5 -55.7 -49.4 -33.4 -23.1 2010 -22.2 -35.0 -47.9 -60.8 -51.6 -58.5 -57.5 -56.6 -59.4 -47.0 -34.6 -23.4 2011 -23.1 -34.4 -53.3 -57.6 -60.3 -59.2 -56.2 -53.8 -56.7 -45.9 -31.5 -23.3 2012 -25.1 -38.1 -49.9 -59.3 -58.3 -56.8 -59.9 -61.4 -59.8 -48.7 -33.2 -20.8 2013 -23.5 -40.6 -51.6 -56.6 -60.1 -50.3 -57.0 -52.1 -49.1 -47.3 -32.0 -22.1 2014 -23.7 -39.7 -55.4 -52.5 -53.8 -54.1 -59.4 -57.5 -57.1 -49.3 -34.7 -23.2 2015 -25.7 -39.5 -51.6 -53.0 -57.4 -56.4 -60.7 -58.4 -59.6 -45.6 -33.5 -26.3 2016 -28.4 -39.6 -51.9 -53.4 -55.7 -56.3 -60.9 -54.7 -58.7 - - - 2017 - - -49.8 -57.1 -55.3 -57.1 - - - - - - 2018 - - - - - - - - - - - - 2019 -25.8 -34.4 -49.1 -56.4 -57.2 -60.7 -56.9 -60.0 -59.0 -49.4 -34.2 -24.9 2020 -26.8 -39.0 -51.6 -53.2 -55.2 -53.2 -58.8 -61.6 -57.6 -51.3 -32.3 -24.3 2021 -27.3 -40.8 -48.8 -56.4 -56.2 -62.4 -57.9 -60.7 -58.4 -52.8 -36.4 - 2022 -26.0 -37.7 -53.0 -57.3 -57.6 -52.1 -59.4 -54.8 -58.0 -49.6 -38.0 -27.1 2023 -29.3 -39.9 -49.6 -53.0 -57.2 -55.2 -57.7 -55.5 -55.0 -49.2 -36.6 - 2024 -29.2 -39.5 -52.3 -57.7 -54.5 -53.9 -52.9 -52.2 -57.2 - -35.4 -