Relay_Station 18Z pressure 1995 - 641.7 638.4 637.0 629.4 634.1 643.3 629.9 621.5 634.5 639.9 642.4 1996 646.3 645.8 635.3 634.1 629.1 635.4 637.8 638.5 642.2 630.3 644.2 647.5 1997 645.6 642.2 633.9 637.4 630.1 640.3 626.1 628.8 629.5 632.3 648.1 648.2 1998 643.2 639.9 636.8 623.8 635.8 633.6 630.6 629.0 630.9 630.8 636.4 640.1 1999 646.2 643.2 636.9 629.9 631.0 644.6 630.3 633.0 633.6 626.1 636.5 637.0 2000 639.9 637.7 634.5 636.5 631.3 637.2 632.4 635.0 635.2 627.9 644.6 649.3 2001 645.7 643.6 638.7 632.4 638.3 638.7 635.3 627.6 627.8 631.3 637.4 641.7 2002 645.2 637.7 643.4 639.4 646.8 638.1 638.6 629.3 633.2 642.7 637.1 641.0 2003 649.5 646.3 638.9 633.1 634.9 640.1 631.1 629.0 630.1 633.1 640.0 652.4 2004 645.4 648.7 634.9 633.9 633.4 629.6 622.7 626.5 627.1 634.6 639.3 649.4 2005 647.9 - - 633.3 635.3 640.6 632.4 631.0 628.8 - - - 2006 - - - - - - - - - - - - 2007 - - - - - - - - - - - - 2008 - - - - - - - - - - - - 2009 - - - - - - - - - - - - 2010 - 645.5 638.6 633.5 633.3 625.7 623.0 621.9 629.4 628.7 634.6 646.3 2011 648.7 641.5 639.3 638.6 631.9 639.6 637.9 635.9 633.3 631.6 644.3 638.5 2012 637.8 642.2 636.4 631.7 633.2 634.8 625.3 631.0 629.0 633.8 645.2 647.3 2013 646.1 638.6 631.2 632.8 630.2 641.5 630.1 637.4 639.2 633.3 643.7 643.8 2014 646.3 641.1 634.8 631.5 637.4 635.6 628.3 631.2 635.3 630.8 638.1 640.1 2015 643.9 637.0 632.9 631.0 632.0 633.1 624.2 622.6 625.3 636.7 641.1 642.9 2016 639.9 639.9 634.0 634.4 633.0 625.2 626.1 638.7 624.3 634.6 644.9 648.0 2017 648.8 644.4 638.6 631.1 633.5 630.3 632.2 623.7 627.4 636.5 637.4 642.3 2018 643.3 639.9 639.5 638.1 640.2 641.5 629.8 633.6 626.5 630.5 633.2 644.3 2019 643.6 645.8 636.5 635.2 634.7 626.8 632.2 629.4 624.6 640.3 645.3 651.3 2020 647.7 641.4 633.7 637.6 634.2 634.8 631.3 634.0 631.5 629.7 639.6 640.4 2021 641.0 635.4 642.4 630.2 632.1 631.8 633.4 628.9 629.0 631.6 637.6 641.2 2022 645.8 639.8 637.0 632.2 633.8 642.1 628.0 630.7 624.0 633.1 630.1 637.8 2023 637.8 638.7 638.2 638.8 632.0 638.2 631.4 631.0 636.0 633.7 637.1 640.5 2024 641.6 637.7 635.1 630.8 632.3 633.7 642.1 642.6 630.5 - - -