Henry 06Z temperature 1993 - -40.6 -50.8 -56.4 -56.0 -58.3 -58.3 - - - -36.2 -26.4 1994 -26.0 -41.3 -52.0 -55.8 -56.8 -52.9 -58.3 - - - -35.9 -26.4 1995 -28.2 -39.0 -50.5 -56.7 -58.0 -56.5 -53.0 -59.1 - - -35.8 -23.6 1996 -27.1 -35.8 -54.3 -54.2 -59.7 -58.1 -53.1 -51.3 - - -33.8 -23.5 1997 -26.5 -40.5 -52.4 -55.4 -57.3 -55.5 -63.5 -58.1 - - -32.3 -24.4 1998 -25.4 -36.4 -51.6 -60.1 -56.5 -54.5 -57.3 -60.2 - - -35.2 -25.0 1999 -23.5 -38.7 -53.3 -58.6 -56.3 -56.0 -60.5 -54.7 - - -36.7 -27.8 2000 -27.1 -40.3 -54.4 -59.9 -57.5 -56.9 -59.5 -58.9 - - -31.9 -24.2 2001 -25.5 -38.9 -54.0 -57.8 -57.4 -55.6 -57.9 -61.5 - - -32.4 -23.7 2002 -23.3 -38.7 -47.5 -52.2 -54.3 -58.6 -53.0 -55.2 - - -36.3 -26.9 2003 -24.8 -37.1 -50.6 -56.3 -58.4 -60.8 -61.5 - - -49.1 -35.1 -22.0 2004 -23.7 -35.5 -52.8 -53.4 -57.3 -60.2 -64.6 - - - -36.5 -21.7 2005 -22.5 -37.6 -50.3 -53.2 -57.8 -57.0 -60.3 - - - -36.0 -21.2 2006 -25.1 -40.1 -53.8 -55.0 -55.2 -56.5 -64.2 - - -51.4 -34.6 - 2007 -24.1 -38.9 -54.9 -59.8 -52.2 -50.8 -56.5 - - - -35.2 -24.7 2008 - -38.6 -50.8 -52.7 -57.6 -59.0 -54.9 -59.1 -53.5 -49.2 -35.2 -23.6 2009 -24.0 -39.1 -50.5 -57.8 -49.0 -53.3 -55.7 -59.7 -55.8 -49.8 -33.6 -22.8 2010 -21.9 -35.4 -48.1 -60.8 -51.5 -58.6 -57.1 -56.8 -59.5 -46.8 -34.6 -23.3 2011 -22.8 -34.4 -53.7 -57.4 -60.6 -59.3 -56.0 -53.7 -56.9 -45.5 -31.8 -23.1 2012 -25.2 -38.1 -49.9 -59.2 -58.3 -57.1 -59.8 -61.4 -59.8 -48.3 -33.1 -21.2 2013 -23.4 -40.5 -51.4 -56.6 -60.3 -50.2 -57.0 -52.4 -49.3 -46.7 -32.3 -22.1 2014 -23.4 -39.7 -55.4 -52.7 -53.8 -54.0 -59.4 -57.8 -56.8 -49.0 -34.8 -23.0 2015 -25.8 -40.0 -51.8 -52.6 -57.4 -56.3 -60.8 -58.1 -59.5 -45.9 -34.2 -26.7 2016 -28.8 -40.0 -52.3 -53.6 -55.7 -56.2 -60.9 -54.9 -58.8 - - -24.2 2017 - - -49.5 -57.1 -55.4 -57.4 - - - - - - 2018 - - - - - - - - - - - - 2019 -25.9 -35.2 -49.2 -56.5 -57.4 -61.0 -56.8 -60.4 -58.8 -49.8 -34.6 -25.1 2020 -27.0 -39.4 -51.7 -53.4 -55.1 -52.8 -58.7 -61.7 -57.5 -51.4 -32.8 -24.5 2021 -27.8 -41.1 -49.2 -56.3 -56.3 -62.7 -57.8 -60.8 -58.5 -53.1 -37.0 - 2022 -26.4 -38.0 -53.3 -57.3 -57.2 -51.8 -59.3 -54.6 -58.3 -49.5 -38.4 -27.4 2023 -29.5 -40.0 -49.2 -52.7 -57.3 -54.7 -58.0 -55.7 -55.4 -49.7 -36.8 - 2024 -29.6 -40.5 -52.4 -57.8 -54.0 -53.6 -52.9 -52.0 -57.4 - - -