Henry 00Z temperature 1993 - -40.7 -50.4 -56.5 -56.0 -58.7 -58.1 - - - -36.0 -26.2 1994 -25.8 -41.3 -52.2 -55.1 -56.9 -53.0 -58.4 - - - -36.1 -26.3 1995 -28.3 -38.6 -50.0 -56.3 -58.0 -56.1 -53.1 -59.3 - - -36.0 -23.9 1996 -27.2 -35.7 -54.1 -54.0 -59.9 -58.1 -53.4 -51.8 - - -33.5 -23.4 1997 -26.2 -40.7 -51.9 -55.5 -57.2 -55.1 -63.8 -58.2 - - -32.4 -24.5 1998 -25.5 -35.9 -51.3 -60.1 -56.7 -55.0 -57.4 -60.2 - - -35.6 -24.9 1999 -23.4 -38.7 -53.2 -58.6 -56.3 -56.0 -60.7 -54.7 - - -37.1 -27.4 2000 -27.0 -40.3 -54.4 -59.4 -57.9 -57.1 -60.0 -58.9 - - -31.8 -24.2 2001 -25.7 -38.6 -54.1 -57.4 -56.7 -55.2 -57.9 -61.4 - - -32.3 -23.7 2002 -23.3 -38.6 -47.6 -52.2 -54.3 -58.8 -53.2 -55.8 - - -36.4 -27.3 2003 -24.7 -36.6 -50.5 -56.1 -58.4 -61.0 -61.6 - - - -35.1 -21.8 2004 -23.9 -35.4 -52.4 -53.2 -57.6 -60.2 -64.9 - - - -36.9 -21.8 2005 -22.3 -37.9 -50.3 -53.2 -57.4 -57.0 -60.3 - - - -36.5 -21.3 2006 -25.0 -40.3 -53.8 -55.4 -54.9 -56.1 -64.1 - - - -34.5 -25.6 2007 -24.0 -38.5 -54.6 -60.0 -52.6 -51.2 -57.0 - - - -35.5 -24.9 2008 - -38.7 -50.5 -53.2 -57.1 -59.1 -54.5 -58.8 -53.7 -49.8 -35.8 -23.4 2009 -23.9 -39.0 -51.2 -57.8 -49.3 -53.1 -55.4 -59.4 -55.6 -49.8 -33.7 -22.8 2010 -22.2 -35.1 -48.1 -60.7 -51.6 -58.8 -57.4 -56.5 -59.5 -47.8 -34.7 -23.2 2011 -23.1 -34.2 -53.5 -57.1 -60.5 -59.1 -56.5 -53.8 -56.9 -46.4 -31.4 -23.3 2012 -24.6 -38.0 -49.8 -59.3 -58.2 -57.2 -59.6 -61.5 -60.1 -49.4 -33.7 -20.5 2013 -23.2 -40.5 -51.3 -56.7 -60.3 -50.5 -57.0 -52.2 -50.1 -47.8 -32.1 -21.7 2014 -23.6 -39.9 -55.5 -53.0 -53.6 -53.8 -59.3 -57.2 -57.1 -50.1 -34.9 -23.3 2015 -25.6 -39.4 -51.6 -53.0 -57.9 -56.1 -60.9 -58.1 -59.9 -46.0 -33.8 -26.4 2016 -28.6 -39.6 -51.7 -53.4 -55.6 -56.5 -61.1 -54.6 -58.7 - - -23.9 2017 - - -49.9 -57.1 -55.6 -57.3 - - - - - - 2018 - - - - - - - - - - - - 2019 -25.6 -34.7 -49.3 -56.5 -57.2 -60.6 -56.7 -60.1 -59.1 -50.2 -34.7 -25.2 2020 -27.0 -39.3 -51.7 -53.1 -55.4 -52.9 -58.5 -61.6 -57.5 -51.8 -32.7 -24.4 2021 -27.5 -40.8 -49.1 -56.4 -56.1 -62.4 -57.8 -60.6 -58.6 -53.6 -36.6 -25.1 2022 -25.9 -37.5 -53.1 -57.5 -57.5 -52.1 -60.0 -54.7 -58.3 -50.6 -38.7 -27.4 2023 -29.5 -40.2 -49.8 -53.0 -57.0 -55.4 -57.8 -55.6 -55.3 -49.7 -36.8 - 2024 - -39.9 -52.2 -57.8 -54.0 -53.7 -53.6 -52.4 -57.0 -47.1 -35.7 -