MPA 12Z 50hPa temperature 1987 - - - - - - - - - - - -53.7 1988 -48.4 -51.6 -54.6 -56.0 -59.5 -63.7 -68.7 -66.2 -60.1 -61.5 -54.3 -48.6 1989 -48.6 -51.9 -53.6 -56.5 -60.0 -63.2 -63.2 -64.7 -61.4 -65.0 -50.8 -50.1 1990 - -52.8 -52.8 -55.4 -61.2 -64.6 -64.5 -61.4 -64.5 -55.0 -55.9 -53.5 1991 -51.7 -51.6 -54.6 -56.4 -59.9 -63.7 -64.1 -66.5 -66.7 -65.6 -47.3 -46.9 1992 -49.3 -50.4 -54.4 -56.7 -59.0 -64.5 -64.0 -65.3 -64.7 -54.9 -50.5 -52.5 1993 -48.8 -52.9 -54.3 -56.4 -58.3 -61.3 -61.6 -64.6 -58.1 -63.8 -55.7 -49.2 1994 -51.0 -50.2 -54.8 -57.0 -64.3 -63.2 -65.0 -64.2 -63.5 -59.7 -59.0 -49.0 1995 -49.9 -51.0 - -58.0 -59.8 -62.0 -67.6 -62.7 - -58.1 -59.0 -51.7 1996 -49.6 -51.1 -54.6 -57.4 -61.4 -64.6 -63.7 -65.8 -62.7 -55.3 -55.0 -55.4 1997 -50.5 -50.5 -56.5 -57.7 -61.4 -65.5 -65.0 -65.1 - - - - 1998 -51.0 -52.5 -53.9 -58.3 -62.9 -65.7 -66.2 -64.9 -66.8 -63.3 -52.9 -52.9 1999 -52.2 -52.2 -55.7 -59.6 -58.3 -64.9 -66.3 -63.5 -62.1 -61.5 -54.1 -51.7 2000 -51.0 -52.8 -55.2 -58.6 -60.5 -64.4 -68.2 -64.7 -65.6 -65.9 -48.6 -49.7 2001 -50.3 -51.6 -55.6 -58.3 -62.3 -67.4 -63.6 -68.9 -62.7 -62.1 -50.0 -52.4 2002 -51.1 -52.7 -53.5 -56.7 -61.5 -62.8 -61.6 -67.9 -59.9 -53.3 -54.5 -51.2 2003 -50.2 -52.4 -55.1 -58.3 -59.9 -63.4 -66.0 -66.3 -68.3 -58.4 -48.9 -49.7 2004 -51.5 -54.2 -56.2 -57.4 -62.2 -63.8 -65.8 -68.0 -66.3 -56.9 -54.2 -53.3 2005 -50.7 -54.2 -54.7 -58.6 -61.3 -64.9 -65.4 -62.7 -67.0 -59.7 -53.2 -49.0 2006 -50.6 -53.6 -54.7 -57.4 -62.6 -61.9 -65.5 -67.1 -61.7 -56.6 -50.1 -51.0 2007 -51.3 -52.0 -54.8 -58.2 -60.2 -64.5 -62.3 -62.8 -69.1 -61.0 -52.2 -51.0 2008 -51.5 -54.6 -56.8 -57.1 -63.2 -60.9 -64.1 -66.0 -65.9 -62.0 -53.5 -53.6 2009 - - - - - - - - - - - - 2010 - - - - - - - - - - - - 2011 - - - - - - - - - - - - 2012 - - - - - - - - - - - - 2013 - - - - - - - - - - - - 2014 - - - - - - - - - - - - 2015 - - - - - - - - - - - - 2016 - - - - - - - - - - - - 2017 - - - - - - - - - - - - 2018 - - - - - - - - - - - - 2019 - - - - - - - - - - - - 2020 - - - - - - - - - - -52.9 - 2021 - - - - - - - - - - - - 2022 - - - - - - - - - - - - 2023 - - - - - - - - - - - - 2024 - - - - - - - - - - - -