24-hour PSI readings in October 2006[60] Date North South East West Central Overall 1 40 41 38 34 37 41 2 70 73 71 68 70 73 3 55 62 54 61 58 62 4 39 51 39 52 41 52 5 49 53 41 54 45 54 6 56 65 55 80 57 80 7 117 128 101 122 112 128 8 73 86 71 109 80 109 9 49 52 50 52 52 52 10 59 56 57 59 55 59 11 67 64 60 71 70 71 12 65 63 60 71 66 71 13 50 46 43 54 47 54 14 63 57 58 72 57 72 15 92 89 93 93 88 93 16 89 94 91 98 92 98 17 85 80 86 92 84 92 18 84 78 75 92 79 92 19 76 71 73 81 72 81 20 97 98 96 102 96 102 21 75 79 75 81 81 81 22 73 71 67 74 73 74 23 74 81 79 77 80 81 24 52 46 45 58 51 58 25 38 33 33 44 38 44 26 31 29 32 38 36 38 27 29 22 24 31 28 31 28 39 38 38 46 42 46 29 52 45 37 52 50 52 30 52 50 50 53 51 53 31 55 51 48 56 53 56 Avg 62.7 62.9 59.3 68.6 62.6 69.4