Davis 12Z 850hPa height 1971 - - - - - - - - - 1112.9 1145.0 1227.7 1972 1225.2 1189.3 1200.6 - - - - - - - - 1229.4 1973 1231.9 1148.9 1092.0 - - - - - - 1126.0 1151.7 1123.0 1974 1192.4 1142.5 1119.7 - - - - - - 1122.9 1195.7 1249.7 1975 1224.0 1193.2 1159.7 - - - - - - - 1129.3 1211.6 1976 - 1180.4 1150.3 - - - - - - 1078.1 1195.0 1296.8 1977 1238.4 1185.0 1153.9 - - - - - - 1123.1 1137.7 1190.6 1978 1132.7 - - - - - - - - - - - 1979 - - - - - - - - - - - - 1980 - - - - - - - - - - - - 1981 - - - - - - - - - - - - 1982 - - - - - - - - - - - - 1983 - - - - - - - - - - - - 1984 - - - - - - - - - - - - 1985 - - - - - - - - - - - - 1986 - - - - - - - - - - - - 1987 - - - - - - - - - - - - 1988 - - - - - - - - - - - - 1989 - - 1133.2 1152.3 1024.8 1098.0 1067.1 1132.3 1093.7 1087.7 1174.7 1189.7 1990 1211.0 1148.2 1157.7 1202.3 1205.2 1152.4 1209.4 1069.0 1031.7 1129.7 1159.3 1179.0 1991 1141.3 1168.3 1106.2 1133.3 1120.6 1170.0 1177.7 1091.2 1125.5 1069.1 1157.8 1249.1 1992 1209.3 1230.3 1159.2 1127.9 1218.3 1185.6 1098.0 1070.6 1050.1 1114.0 1111.7 1151.2 1993 1242.4 1126.4 1132.6 1118.4 1068.8 1093.8 1040.5 1031.1 1061.6 1055.7 1122.5 1153.1 1994 1186.9 1110.1 1098.8 1151.2 1153.8 - 1130.3 1059.8 1091.6 1085.1 1186.8 1125.9 1995 1161.4 1166.0 1136.7 1132.0 1098.2 1135.2 1213.4 1103.3 1006.4 1117.6 1150.8 1141.6 1996 1201.4 1193.2 1121.2 1124.4 1113.3 1147.6 1137.3 1116.5 1186.6 1087.2 1190.8 1199.5 1997 1191.2 1164.0 1074.0 1160.9 1085.3 1162.6 1049.0 1075.4 1065.3 1103.4 1181.4 1212.8 1998 1166.3 1152.1 1110.3 1019.5 1096.4 1089.7 1098.5 1048.2 1121.1 1109.6 1083.6 1119.4 1999 1177.0 1178.6 1161.3 1094.0 1089.7 1199.6 1100.7 1064.8 1099.3 1014.8 1115.0 1104.5 2000 1129.1 1135.7 1136.9 1144.4 1089.0 1148.5 1115.2 1096.1 1132.3 1052.0 1176.8 1231.6 2001 1174.3 1218.6 1136.9 1076.6 1135.7 1104.7 1124.4 1076.5 1060.1 1078.8 1112.0 1144.8 2002 1150.4 1101.5 1186.3 1114.7 1211.3 1129.1 1141.9 1057.9 1125.0 1178.2 1144.9 1126.3 2003 1226.8 1187.3 1152.5 1098.8 1130.9 1204.7 1120.3 1061.5 1094.0 1106.9 1144.7 1221.0 2004 1178.9 1211.8 1102.0 1099.6 1141.7 1092.2 - 1081.0 1052.9 1120.6 1151.4 - 2005 - - - - - - - - - - 1161.3 1264.1 2006 1187.8 1169.8 - - - - - - - - 1168.7 1166.6 2007 1194.0 1142.8 1160.8 1161.3 1144.0 1183.5 1221.2 1120.2 1114.9 1119.7 1155.4 1142.0 2008 1164.8 1119.7 - - - - - - - - - 1223.8 2009 1180.1 1179.0 - - - - - - - - 1163.9 1174.7 2010 1236.1 1202.4 1153.3 1137.4 1118.6 1061.4 1021.2 1038.7 1084.0 1096.0 1132.4 1207.1 2011 1229.2 1156.8 1156.5 1143.4 1112.5 1176.7 1156.1 1071.8 1127.8 1094.3 1214.6 1124.0 2012 1124.3 1176.4 1132.3 1118.5 1123.7 1141.4 1062.6 1081.4 1073.9 1085.6 - 1223.7 2013 1187.6 - - - - - - - - - 1186.3 1186.5 2014 1197.6 1157.8 1147.3 1125.2 1167.2 1122.0 1099.1 1075.2 1138.5 1110.2 1155.3 1134.4 2015 1172.5 - 1086.1 1086.1 1103.6 1117.4 1083.8 1047.5 1068.5 1139.7 1108.7 1172.4 2016 1140.4 1151.0 - - - - - - - - 1191.8 1198.4 2017 1232.8 1187.9 1137.4 1081.6 1086.0 1118.1 1119.0 1043.3 1063.1 1112.2 1131.8 1162.3 2018 1161.9 1156.0 1164.6 1173.9 1127.7 1189.7 1098.2 1139.9 1043.0 1060.6 1104.3 1176.6 2019 1156.0 1180.2 1152.2 1152.5 1172.6 1099.7 1132.1 1095.7 1068.9 1160.0 1217.8 1258.1 2020 1221.5 1166.2 1095.3 1141.8 1128.5 1134.6 1130.0 1166.3 1096.1 1099.9 1161.5 1122.3 2021 1144.4 1124.1 1150.4 1091.1 1110.4 1120.1 1160.8 1074.3 1049.9 1091.1 1119.3 1127.0 2022 1173.8 1137.6 1134.5 1107.2 1143.2 1173.8 1090.9 1112.2 1057.3 1100.3 1072.4 1110.5 2023 1114.4 1148.3 1142.6 1147.1 1125.5 1172.8 1133.1 1097.5 1111.3 1097.9 1149.6 1129.6 2024 1161.5 1122.8 1110.0 1095.5 - - - - - - - -