YEAR,Jan,Feb,Mar,Apr,May,Jun,Jul,Aug,Sep,Oct,Nov,Dec,Annual 24-hr Avg.
1995,,401,414,444,455,497,494,474,530,647,498,361
1996,325,374,442,488,514,472,468,491,500,572,466,333,454
1997,338,402,462,466,503,485,444,420,463,499,531,390,450
1998,357,422,473,501,488,523,497,498,525,497,589,375,479
1999,375,395,484,520,540,508,482,491,509,525,583,434,487
2000,368,449,498,538,573,538,526,601,577,537,567,509,523
2001,428,458,517,513,567,536,533,533,559,571,541,384,512
2002,406,442,523,533,599,573,555,624,632,584,607,392,539
2003,401,440,505,483,576,626,528,570,655,605,545,430,530
2004,388,431,539,563,580,560,538,557,620,577,563,426,529
2005,495,450,502,492,571,589,521,530,551,525,534,424,515
2006,429,465,503,548,604,551,500,521,565,574,586,447,524
2007,441,415,527,519,550,559,538,564,582,533,593,441,522
2008,339,461,540,584,560,534