Davis 12Z 50hPa height 1971 - - - - - - - - - 19283.1 20319.5 20650.0 1972 20729.1 20588.4 20291.7 - - - - - - - - 20676.7 1973 20697.4 20554.0 20219.6 - - - - - - 19122.7 - - 1974 - 20548.6 - - - - - - - 19527.8 20404.5 20671.4 1975 20780.6 20587.2 20359.2 - - - - - - - 19980.8 20615.4 1976 - 20576.2 20310.0 - - - - - - 18972.7 20305.5 20690.0 1977 20699.5 20520.9 20219.6 - - - - - - 19676.4 20120.0 20600.7 1978 20568.2 - - - - - - - - - - - 1979 - - - - - - - - - - - - 1980 - - - - - - - - - - - - 1981 - - - - - - - - - - - - 1982 - - - - - - - - - - - - 1983 - - - - - - - - - - - - 1984 - - - - - - - - - - - - 1985 - - - - - - - - - - - - 1986 - - - - - - - - - - - - 1987 - - - - - - - - - - - - 1988 - - - - - - - - - - - - 1989 - - 20225.6 19796.4 19281.2 18895.7 18618.1 18533.5 18700.0 19130.0 19706.2 20645.4 1990 20640.0 20529.3 20209.7 19912.1 19629.7 18958.0 19001.4 18548.9 18552.1 19204.8 19711.0 20411.7 1991 20518.6 20454.8 20261.4 19872.6 19381.4 19171.8 18866.8 18739.4 18821.5 19437.9 19929.1 20686.0 1992 20648.2 20526.8 20183.3 19813.2 19482.2 19406.7 18821.5 18583.7 18675.2 18996.2 19681.0 20328.5 1993 20590.6 20482.2 20232.4 19757.4 19326.2 18732.3 18780.0 18497.0 18746.5 19181.9 19717.6 20247.1 1994 20538.6 20407.4 20066.5 19746.3 19530.6 - 18772.6 18550.0 18575.4 19200.7 20265.0 20381.5 1995 20535.9 20479.2 20166.8 19906.2 19291.8 18907.9 18929.6 18659.0 18744.5 18980.8 19859.7 20108.2 1996 20511.8 20461.3 20169.6 19826.8 19171.3 19161.6 18770.9 18802.3 19161.0 18868.7 19569.7 20445.5 1997 20607.3 20493.6 20157.7 19779.6 19349.4 18948.9 18501.1 18699.4 18808.3 18935.3 20153.6 20415.1 1998 20516.5 20421.1 20119.4 19687.4 19262.6 19129.0 18697.2 18513.1 18738.4 18932.7 19398.5 19931.9 1999 20413.4 20407.9 20131.9 19616.6 19302.8 19072.8 18599.9 18542.6 18803.4 18930.3 19393.2 19750.7 2000 20382.5 20398.0 20068.9 19792.5 19239.4 18988.5 18680.0 18587.9 18935.9 19305.1 19759.0 20575.1 2001 20617.2 20511.0 20211.3 19681.7 19448.3 19235.4 18656.6 18483.7 18563.8 18813.2 19137.5 20177.2 2002 20554.9 20426.5 20275.0 19870.4 19700.5 19270.6 18872.9 18718.3 19263.5 19907.4 20171.0 20498.0 2003 20603.2 20509.6 20225.5 19708.1 19284.6 19056.9 18609.8 18558.9 18739.7 18868.6 19799.2 20469.0 2004 20587.3 20507.3 20199.0 19840.0 19447.5 19010.7 - - 18745.7 19220.7 19849.3 - 2005 - - - - - - - - - - 19626.2 20582.4 2006 20548.7 20407.4 - - - - - - - - 19520.4 20080.5 2007 20469.8 20433.0 20208.3 19880.3 19412.4 19170.6 18800.9 18653.9 18815.5 19055.4 19665.2 20097.1 2008 20446.7 20404.1 - - - - - - - - - 20257.8 2009 20458.3 20445.8 - - - - - - - - 20538.7 20441.8 2010 20617.3 20531.1 20191.7 19759.2 19245.0 18785.3 18524.3 18490.8 18692.3 18878.0 19409.7 20272.1 2011 20572.7 20456.3 20164.9 19844.3 19355.4 18946.4 18771.8 18643.2 18728.9 19172.8 19821.8 19967.8 2012 20426.9 20440.8 20197.3 19806.2 19308.3 18915.1 18625.7 18713.4 18892.9 19416.5 - 20617.4 2013 20630.8 - - - - - - - - - 20297.8 20585.5 2014 20577.1 20479.4 20192.6 19718.9 19433.8 19035.5 18592.2 18529.8 18756.9 19062.9 19897.1 20181.1 2015 20545.4 - 20023.8 19682.0 19339.3 18929.6 18592.4 18496.3 18525.4 18783.5 19607.3 19962.2 2016 20410.0 20416.7 - - - - - - - - 20306.4 20521.9 2017 20636.2 20510.4 20156.7 19651.8 19291.7 18883.8 18729.6 18609.0 18967.7 19345.0 19688.2 20541.9 2018 20585.0 20500.9 20177.0 19936.8 19277.0 19020.8 18636.7 18615.6 18552.1 18923.3 19471.8 20479.7 2019 20521.0 20508.8 20210.7 19835.7 19350.7 18922.9 18834.8 18757.2 19349.0 19806.3 20409.3 20549.3 2020 20645.5 20548.9 20191.0 19894.1 19414.6 18862.1 18775.2 18817.9 18758.0 18785.5 19215.4 19872.4 2021 20442.6 20407.9 20207.0 19797.0 19184.6 18883.2 18680.0 18556.0 18653.3 18927.9 19349.6 19930.0 2022 20524.0 20428.1 20148.3 19727.9 19329.7 19077.3 18598.0 18582.2 18558.5 18870.3 19425.6 19880.0 2023 20449.0 20405.4 20228.2 19826.2 19307.1 19024.5 18645.3 18602.2 18848.6 18955.2 19278.1 20234.1 2024 20360.3 20368.3 20085.7 19725.9 - - - - - - - -