Davis 12Z 300hPa height 1971 - - - - - - - - - 8310.0 8405.0 8698.1 1972 8687.7 8549.3 8474.7 - - - - - - - - 8587.6 1973 8635.8 8502.6 8376.0 - - - - - - 8354.3 8456.7 8414.0 1974 8552.9 8529.3 8386.8 - - - - - - 8357.0 8518.3 8678.3 1975 8664.7 8568.9 8475.2 - - - - - - - 8442.0 8579.0 1976 - 8542.9 8430.0 - - - - - - 8215.2 8510.0 8728.1 1977 8671.9 8576.1 8396.5 - - - - - - 8286.9 8405.2 8522.9 1978 8424.5 - - - - - - - - - - - 1979 - - - - - - - - - - - - 1980 - - - - - - - - - - - - 1981 - - - - - - - - - - - - 1982 - - - - - - - - - - - - 1983 - - - - - - - - - - - - 1984 - - - - - - - - - - - - 1985 - - - - - - - - - - - - 1986 - - - - - - - - - - - - 1987 - - - - - - - - - - - - 1988 - - - - - - - - - - - - 1989 - - 8405.2 8332.1 8157.7 8257.2 8212.9 8319.7 8289.0 8297.7 8442.0 8628.1 1990 8648.6 8549.6 8441.6 8512.4 8425.5 8287.9 8468.1 8172.3 8104.7 8338.4 8462.7 8578.7 1991 8512.7 8555.6 8485.7 8384.3 8351.3 8425.5 8440.6 8262.5 8258.7 8237.1 8444.4 8668.4 1992 8603.9 8608.9 8466.7 8376.3 8466.2 8412.7 8237.4 8168.3 8099.5 8281.7 8455.6 8465.8 1993 8701.9 8486.0 8397.3 8322.2 8156.0 8225.9 8165.3 8136.4 8179.6 8233.8 8376.7 8482.7 1994 8569.6 8447.6 8383.8 8324.6 8312.3 - 8323.7 8156.2 8238.6 8263.3 8515.0 8486.7 1995 8546.1 8566.8 8427.8 8440.2 8276.5 8282.1 8445.1 8221.6 8088.2 8270.3 8450.6 8507.2 1996 8614.6 8601.9 8432.6 8376.5 8219.3 8364.4 8263.6 8328.7 8404.0 8292.3 8473.5 8582.7 1997 8597.2 8529.3 8390.8 8388.3 8256.3 8339.1 8124.1 8203.6 8109.9 8287.8 8460.1 8638.2 1998 8555.7 8530.5 8425.7 8202.9 8260.6 8271.8 8252.0 8199.8 8278.9 8277.9 8375.7 8449.9 1999 8559.1 8542.6 8438.6 8239.4 8273.4 8408.5 8191.9 8178.5 8234.8 8163.0 8389.7 8406.6 2000 8523.8 8480.6 8410.5 8435.8 8242.4 8422.5 8246.9 8225.2 8305.5 8159.3 8479.3 8643.0 2001 8608.8 8630.9 8452.8 8258.1 8323.6 8261.9 8279.4 8159.4 8162.3 8247.9 8359.6 8517.9 2002 8537.6 8472.5 8496.7 8382.1 8489.7 8305.8 8296.4 8189.1 8270.6 8434.7 8427.5 8504.7 2003 8695.9 8593.8 8444.6 8298.1 8307.6 8358.1 8261.3 8189.7 8261.2 8239.2 8441.5 8623.9 2004 8624.8 8663.5 8403.8 8335.3 8338.7 8244.0 - 8119.3 8133.1 8333.3 8450.0 - 2005 - - - - - - - - - - 8446.8 8723.8 2006 8568.9 8525.6 - - - - - - - - 8553.7 8487.9 2007 8629.9 8486.3 8420.8 8471.3 8412.2 8397.0 8409.1 8288.3 8209.3 8310.3 8470.6 8515.4 2008 8504.1 8463.8 - - - - - - - - - 8616.8 2009 8624.3 8625.8 - - - - - - - - 8525.8 8524.4 2010 8679.6 8619.9 8462.4 8334.6 8297.9 8192.7 8082.7 8119.9 8271.2 8261.0 8408.9 8554.6 2011 8711.2 8488.8 8428.2 8369.6 8299.7 8398.5 8385.6 8219.5 8280.3 8246.8 8559.9 8415.5 2012 8519.1 8567.1 8406.9 8380.7 8303.4 8291.4 8153.1 8201.2 8173.5 8295.2 - 8648.5 2013 8681.3 - - - - - - - - - 8586.5 8578.8 2014 8609.4 8527.1 8450.0 8282.4 8448.8 8263.1 8230.0 8173.0 8308.6 8304.0 8443.3 8492.3 2015 8602.8 - 8343.1 8290.0 8253.7 8281.9 8173.9 8168.7 8171.3 8326.3 8458.1 8555.4 2016 8512.3 8500.0 - - - - - - - - 8538.8 8585.2 2017 8653.7 8537.5 8424.7 8246.1 8295.7 8250.7 8294.1 8165.2 8186.4 8285.8 8466.4 8550.0 2018 8619.3 8594.8 8483.2 8489.6 8275.5 8408.3 8276.3 8347.0 8137.8 8220.0 8343.7 8565.7 2019 8583.7 8631.4 8452.0 8421.1 8333.5 8308.3 8265.2 8224.3 8192.3 8448.4 8582.0 8673.9 2020 8704.8 8552.1 8363.2 8398.6 8373.1 8356.6 8332.6 8330.3 8258.1 8320.0 8501.7 8490.0 2021 8530.6 8479.6 8463.0 8339.3 8279.4 8231.0 8293.1 8234.5 8208.6 8314.2 8411.0 8483.1 2022 8573.2 8483.2 8456.1 8334.3 8334.5 8430.7 8237.3 8284.0 8153.7 8327.7 8329.3 8443.5 2023 8472.6 8539.2 8530.0 8448.2 8308.8 8336.2 8292.3 8209.2 8314.8 8280.0 8356.9 8534.7 2024 8587.4 8503.8 8429.7 8331.0 - - - - - - - -