MPA 00Z 150hPa temperature 1987 - - - - - - - - - - - -51.1 1988 -47.6 -52.3 -53.5 -52.9 -56.0 -57.1 -60.8 -61.1 -58.5 -58.2 -52.0 -49.2 1989 -49.1 -50.9 -53.2 -51.6 -54.2 -55.8 -57.2 -57.0 -59.2 -61.5 -51.7 -51.9 1990 - -52.4 -50.8 -49.7 -55.9 -56.8 -58.5 -55.6 -59.7 -55.0 -55.0 -53.3 1991 -53.2 -51.8 -51.0 -54.3 -55.3 -57.6 -58.5 -60.3 -61.4 -61.0 -52.4 -48.3 1992 -51.8 -50.0 -53.1 -54.3 -54.0 -57.6 -58.1 -58.9 -60.0 -55.2 -49.6 -51.5 1993 -48.5 -52.8 -53.5 -54.1 -52.8 -56.2 -56.1 -58.4 -56.7 -58.3 -55.6 -50.0 1994 -52.3 -49.8 -53.4 -54.8 -57.2 -56.2 -58.3 -57.6 -59.4 -61.0 -56.4 -48.1 1995 -49.9 -50.6 - -54.9 -53.4 -54.7 -59.5 -59.3 - -56.3 -56.7 -51.3 1996 -50.1 -51.6 -53.0 -54.3 -57.0 -57.8 -58.2 -58.8 -58.4 -54.3 -54.2 -55.4 1997 -50.8 -49.8 -51.9 -52.5 -55.9 -56.4 -56.8 -58.9 - - - - 1998 -49.9 -54.2 -54.2 -57.8 -60.1 -59.6 -60.1 -59.8 -59.6 -58.2 -52.6 -52.9 1999 -53.4 -51.7 -54.2 -56.5 -54.4 -58.8 -60.8 -60.8 -59.8 -60.2 -56.9 -52.7 2000 -52.5 -53.4 -53.4 -56.2 -57.7 -59.2 -60.5 -59.9 -62.6 -62.0 -49.7 -50.5 2001 -50.6 -49.8 -52.9 -53.6 -57.0 -59.3 -57.3 -61.3 -58.6 -59.7 -52.5 -53.5 2002 -54.4 -53.4 -50.9 -54.7 -55.7 -57.9 -57.0 -59.7 -58.0 -53.3 -53.2 -53.2 2003 -49.7 -51.5 -53.3 -55.3 -55.3 -55.0 -58.6 -60.8 -61.4 -56.7 -52.0 -51.6 2004 -53.6 -55.6 -53.4 -51.8 -56.3 -55.7 -58.5 -61.3 -60.1 -54.6 -55.1 -54.0 2005 -49.8 -54.6 -52.8 -54.8 -55.1 -57.8 -58.6 -59.5 -61.5 -56.3 -52.2 -52.4 2006 -51.3 -53.9 -52.5 -53.5 -57.6 -54.9 -57.5 -60.3 -59.7 -54.1 -53.7 -51.8 2007 -51.7 -51.4 -53.6 -54.4 -55.8 - - - -62.4 -56.8 -51.5 -50.8 2008 -51.9 -53.1 -54.3 -53.1 -57.1 -55.4 -57.1 -59.7 -59.9 -60.1 -52.7 -53.6 2009 -52.8 -51.8 -52.8 -53.3 -55.2 -58.0 -56.7 -59.5 -60.2 -53.3 -57.4 -53.6 2010 -49.9 -49.9 -54.0 -54.8 -56.3 -58.3 -58.2 -58.1 -59.0 -58.0 -53.0 -52.0 2011 -52.7 -54.1 -54.0 -54.1 -57.7 -57.4 -61.3 -59.0 -61.6 -59.9 -57.5 -53.7 2012 -53.2 -51.9 -53.8 -53.5 -56.5 -57.5 -58.7 -62.3 -61.2 -58.1 -54.4 -50.2 2013 -51.7 -51.1 -54.1 -55.5 -54.7 -53.1 -56.2 -60.1 -61.6 -59.5 -50.7 -52.2 2014 -49.2 -51.7 -51.4 -54.9 -56.3 -57.9 -59.6 -60.0 -58.3 -58.9 -57.0 -49.6 2015 -51.9 -51.6 -53.1 -53.9 -55.8 -56.4 -57.5 -58.4 -62.3 -56.5 -58.3 -53.2 2016 -52.9 -51.6 -56.2 -55.2 -60.7 -59.3 -58.5 -56.7 -60.8 -58.2 -57.9 -49.7 2017 -49.2 -53.4 -54.2 -55.2 -57.7 -57.0 -58.8 -58.7 -59.1 -57.1 -51.7 -50.7 2018 -52.2 -54.0 -52.4 -52.6 -56.8 -56.8 -58.9 -59.7 -61.8 -59.8 -52.7 -54.5 2019 -49.9 -51.5 -53.6 -52.9 -55.7 -57.0 -59.4 -60.2 -61.8 -55.8 -54.9 -50.4 2020 -48.6 -49.7 -52.1 -56.5 -56.9 -55.4 -61.1 -61.6 -56.2 -56.4 -52.3 -53.0 2021 - -54.9 -54.4 -56.8 -57.4 -58.9 -60.6 -63.4 -62.1 -59.8 -56.6 -53.3 2022 -51.1 -51.2 - -54.6 -56.2 -61.2 -59.4 -58.0 -60.3 -57.9 -57.7 -51.6 2023 -54.0 -53.0 -52.8 -55.3 -55.7 -56.5 -61.5 -62.0 -60.4 -58.0 -49.7 -53.1 2024 -53.4 -54.4 -52.4 -54.2 - - - - - - - -