MPA 00Z 50hPa temperature 1987 - - - - - - - - - - - -52.4 1988 -47.9 -51.7 -54.2 -55.6 -59.0 -63.1 -66.8 -64.1 -59.1 -61.5 -53.3 -48.1 1989 -48.0 -51.0 -53.3 -55.7 -59.4 -62.6 -62.4 -64.6 -61.4 -63.8 -49.5 -49.9 1990 - -52.0 -51.8 -54.7 -59.9 -63.8 -64.3 -61.0 -63.5 -52.6 -56.0 -52.5 1991 -51.0 -51.3 -53.0 -56.0 -59.6 -63.2 -62.8 -66.1 -65.0 -64.1 -46.7 -46.8 1992 -48.8 -49.4 -53.8 -56.2 -57.6 -64.1 -63.0 -64.0 -63.8 -54.3 -50.0 -53.1 1993 -47.9 -51.7 -54.1 -56.2 -58.4 -60.8 -61.2 -63.0 -56.8 -63.7 -54.7 -48.9 1994 -50.4 -49.3 -54.6 -56.9 -65.1 -62.3 -64.4 -63.9 -63.3 -56.6 -57.6 -48.2 1995 -49.5 -50.3 - -57.0 -58.4 -61.4 -66.2 -63.1 - -57.5 -58.3 -50.7 1996 -48.8 -50.6 -54.1 -56.4 -60.9 -62.4 -63.0 -63.6 -62.0 -54.3 -54.1 -54.7 1997 -49.1 -49.7 -55.9 -56.9 -60.8 -64.3 -64.9 -64.1 - - - - 1998 -50.5 -52.3 -53.8 -57.9 -62.6 -65.3 -65.2 -64.5 -65.7 -59.7 -53.0 -52.1 1999 -51.5 -51.7 -55.7 -59.2 -57.6 -63.9 -64.8 -62.5 -61.3 -59.0 -53.6 -51.5 2000 -50.8 -52.9 -55.4 -58.0 -60.4 -64.1 -67.4 -64.1 -63.1 -62.5 -48.8 -49.8 2001 -49.8 -51.5 -55.2 -58.3 -62.0 -66.5 -62.6 -68.0 -62.0 -60.6 -49.5 -52.4 2002 -51.1 -52.7 -53.2 -56.1 -60.7 -63.1 -61.6 -67.2 -58.3 -52.2 -54.4 -51.0 2003 -49.8 -52.1 -54.9 -58.0 -60.0 -61.8 -64.4 -65.8 -65.6 -56.9 -49.2 -50.0 2004 -50.8 -54.0 -55.7 -56.8 -61.1 -63.0 -65.5 -67.2 -65.3 -56.3 -53.6 -53.0 2005 -50.0 -54.0 -54.4 -58.6 -61.4 -64.3 -64.7 -62.6 -66.1 -57.4 -53.1 -48.8 2006 -50.5 -52.9 -54.9 -57.2 -62.0 -62.5 -64.9 -67.4 -60.3 -53.5 -50.1 -50.9 2007 -50.9 -51.7 -54.2 -58.5 -57.2 - - - -65.8 -59.4 -51.5 -51.1 2008 -51.1 -53.2 -56.8 -56.7 -61.7 -60.8 - -66.4 -65.5 -61.7 -51.6 -53.8 2009 -53.1 -52.3 -54.9 -57.5 -60.8 -61.3 -62.6 -63.6 -60.5 -51.1 -55.4 -51.4 2010 -49.0 -50.9 -55.2 -57.6 -61.0 -63.9 -64.7 -62.8 -62.7 -59.4 -53.5 -50.9 2011 -53.5 -53.2 -54.7 -57.6 -62.2 -63.5 -69.3 -63.2 -65.0 -61.1 -59.1 -52.4 2012 -52.7 -51.4 -56.3 -57.7 -62.4 -65.7 -64.7 -67.6 -67.4 -58.4 -52.1 -48.9 2013 -51.3 -51.1 -54.7 -58.4 -60.9 -59.3 -63.9 -66.1 -64.5 -61.5 -50.8 -49.4 2014 -50.0 -51.5 -55.5 -58.2 -61.2 -63.4 -67.1 -67.2 -65.1 -58.5 -56.6 -49.6 2015 -51.0 -52.1 -55.1 -57.7 -62.6 -62.7 -65.5 -65.2 -65.3 -58.7 -54.8 -49.1 2016 -50.2 -51.7 -55.2 -57.2 -64.1 -60.9 -64.6 -60.8 -66.9 -61.0 -59.2 -49.8 2017 -49.8 -53.1 -55.1 -57.5 -61.4 -65.3 -64.7 - -62.1 -59.8 -51.1 -50.4 2018 -50.6 -52.8 -54.0 -56.8 -62.7 -63.5 -65.8 -66.6 -66.0 -62.6 -52.9 -52.3 2019 -50.3 -51.1 -55.5 -58.7 -60.3 -62.9 -66.3 -68.1 -68.8 -55.8 -57.6 -50.0 2020 -50.5 -51.8 -55.9 -59.2 -62.4 -63.5 -68.6 -67.7 -59.7 -55.6 -53.5 -53.5 2021 -51.9 -54.4 -56.2 -58.4 -58.4 -64.6 -67.7 -66.1 -62.7 -60.8 -55.4 -53.5 2022 -51.9 -53.1 - -57.4 -61.2 -67.1 -68.2 -64.6 -62.7 -58.8 -58.2 -52.7 2023 -53.9 -53.0 -53.9 -58.5 -62.2 -62.6 -67.8 -66.2 -64.9 -59.8 -48.8 -52.0 2024 -52.3 -53.8 -54.8 -56.8 - - - - - - - -