Pacific / North American (PNA) index * 100; Wallace & Gutzler def. 1 -999 1948 2010 Pacific / North American (PNA) index * 100; Wallace & Gutzler def. The index is standardized wrt December,January,February 1948-2007 -999 for missing; http://jisao.washington.edu/data/pna Todd Mitchell 1948 2010 1 jan feb mar apr may jun jul aug sep oct nov dec 1948 11 -145 -172 -154 80 66 -18 -50 -38 29 -81 -135 1949 -115 -149 16 79 22 -70 -20 41 75 -88 133 -141 1950 -266 -38 29 -37 -61 53 34 99 146 -22 -57 73 1951 -23 -86 -112 81 126 9 2 -5 77 -5 52 -118 1952 -109 27 -93 80 -44 -96 -16 4 79 141 69 114 1953 64 35 -92 64 46 -41 69 33 38 171 94 33 1954 -98 53 -68 -150 26 -2 -67 -59 -57 96 211 -11 1955 38 -145 -166 -79 -45 49 -24 19 -35 -18 -95 -72 1956 -7 -174 -28 33 -18 -22 13 43 -15 -127 119 -9 1957 -140 -149 61 -46 87 9 27 -22 118 184 47 -24 1958 198 144 -8 80 75 73 30 31 -43 -4 -73 63 1959 -38 -94 107 17 -39 9 40 -144 -42 36 41 46 1960 18 63 36 32 20 -25 104 -56 36 52 -34 109 1961 132 6 38 -39 41 59 36 105 -146 -163 -79 -46 1962 -17 -79 -44 15 -157 -56 -32 -44 -38 40 79 58 1963 -13 145 -144 -72 -118 -54 -69 49 92 42 22 167 1964 16 82 -130 -119 -152 18 -24 -84 -85 60 -71 -130 1965 -9 -152 12 -91 -126 23 1 -2 -95 35 -56 -95 1966 41 -82 67 -13 -8 82 12 37 115 -37 -97 39 1967 -54 -9 -174 -214 -29 53 -48 90 163 -10 -38 -117 1968 -106 145 45 -115 40 6 22 -57 -27 -26 127 -94 1969 -181 -3 75 56 72 149 -30 -19 24 68 97 147 1970 35 132 106 -105 -6 108 27 -11 -103 -74 -57 -149 1971 -132 22 -6 -18 57 -55 26 -3 -111 -95 -62 -246 1972 -186 -98 23 -147 62 -32 -53 53 -139 -38 43 -72 1973 25 87 -43 43 22 10 -22 -37 37 -91 -194 38 1974 -165 -32 -77 -7 -102 -38 -34 1 -32 61 -35 35 1975 -118 -67 -70 -118 -25 -48 106 -100 48 -125 -69 -19 1976 -1 -135 -145 -6 10 -83 39 -8 80 66 139 69 1977 144 174 -128 -15 -39 -14 -139 1 -108 55 26 -11 1978 118 169 73 -15 -30 -101 -12 -88 -31 24 -107 -123 1979 -13 -117 50 -86 48 -108 7 26 66 108 59 15 1980 -25 135 -48 190 75 -89 -78 -101 -68 128 95 78 1981 218 25 181 -92 159 -45 -28 121 30 -122 93 28 1982 -89 -136 -135 -95 1 29 1 -40 48 -38 -18 42 1983 156 175 231 88 30 96 -19 -43 -60 -34 131 -31 1984 42 89 159 112 -39 3 15 -22 -50 -34 1 -196 1985 137 -106 -98 -72 -48 -53 74 -45 -95 -158 -174 127 1986 133 26 116 -51 33 9 -73 73 -129 117 -83 111 1987 107 35 109 140 -80 -17 19 -51 80 89 101 -7 1988 36 73 90 91 71 103 5 43 -35 80 -59 -16 1989 -116 -107 -54 -33 -93 -8 -1 60 33 -94 -32 89 1990 -95 -132 38 56 -24 -73 40 42 49 -98 -149 -162 1991 -21 73 -98 31 -18 -84 -12 27 33 -64 48 -17 1992 111 51 169 66 4 107 -60 34 -163 24 10 -161 1993 -57 74 116 160 103 10 -97 19 -85 31 -45 87 1994 22 -132 49 27 53 -54 23 66 49 8 -180 74 1995 141 23 47 5 63 157 -4 -106 144 -55 24 121 1996 -31 -2 17 122 -40 -60 -19 7 19 -37 -57 -96 1997 33 27 -81 112 -39 109 1 25 76 53 84 129 1998 90 211 143 103 12 -71 83 28 24 -9 -40 -55 1999 -27 6 -4 -41 -40 -51 -95 56 83 -14 -1 13 2000 -67 64 49 15 -71 -67 -33 -97 2 -21 42 99 2001 145 -93 60 -89 25 -119 -44 2 60 -70 73 10 2002 -33 24 -110 -91 -102 86 54 37 -58 -3 170 115 2003 138 26 26 -12 -19 39 43 83 96 126 -145 45 2004 3 83 -47 97 -128 -19 83 79 -23 -104 -5 21 2005 -25 -6 124 140 166 22 -56 17 -91 29 -6 151 2006 6 -33 -83 -20 32 107 49 -82 94 -63 -22 98 2007 20 0 -3 106 75 6 142 -76 -109 -16 -10 -91 2008 -72 0 23 -90 93 -67 -12 98 37 24 83 -106 2009 32 -93 -144 -42 -11 63 124 54 135 9 -47 53 2010 158 193 172 42 9 7 6 -40 10 111 -999 -999