| YEAR(S | JAN | FEB | MAR | APR | MAY | JUN | JUL | AUG | SEP | OCT | NOV | DEC | ANN | |||||||||||||
| 1949 | 0.00 | z | 0.00 | z | 0.00 | z | 0.00 | z | 0.00 | z | 0.00 | z | 0.00 | z | 0.00 | z | 0.00 | z | 361.50 | 252.00 | 271.50 | 885.00 | ||||
| 1950 | 257.96 | c | 243.00 | 243.50 | 256.00 | 284.50 | 321.50 | 381.50 | 416.00 | 395.69 | a | 374.50 | 340.00 | 262.00 | 3776.15 | |||||||||||
| 1951 | 252.50 | 207.76 | c | 283.00 | 254.00 | 189.50 | k | 345.00 | 398.00 | 399.50 | 402.50 | 372.00 | 274.00 | 238.50 | 3426.76 | |||||||||||
| 1952 | 191.00 | 223.50 | 210.00 | 214.66 | a | 266.50 | 315.00 | 400.00 | 399.00 | 340.50 | 395.50 | 307.00 | 255.50 | 3518.16 | ||||||||||||
| 1953 | 261.00 | 223.00 | 230.50 | 285.50 | 336.00 | 331.50 | 383.50 | 431.00 | 371.00 | 359.50 | 291.00 | 275.50 | 3779.00 | |||||||||||||
| 1954 | 241.00 | 238.00 | 254.00 | 337.00 | 342.50 | 374.00 | 392.50 | 426.00 | 386.00 | 388.00 | 355.50 | 237.50 | 3972.00 | |||||||||||||
| 1955 | 198.40 | a | 173.00 | 209.50 | 230.50 | 257.50 | 291.50 | 307.00 | 323.00 | 329.00 | 337.50 | 289.50 | 290.00 | 3236.40 | ||||||||||||
| 1956 | 292.50 | 204.50 | 0.00 | z | 269.50 | 304.00 | 310.50 | 382.50 | 419.00 | 385.50 | 395.00 | 323.00 | 304.50 | 3590.50 | ||||||||||||
| 1957 | 228.00 | 157.00 | 198.50 | 262.50 | 306.00 | 364.00 | 415.50 | 421.00 | 450.50 | 445.50 | 358.50 | 259.00 | 3866.00 | |||||||||||||
| 1958 | 221.00 | 228.00 | 210.50 | 257.00 | 308.00 | 354.00 | 412.00 | 451.00 | 398.50 | 380.00 | 342.50 | 269.50 | 3832.00 | |||||||||||||
| 1959 | 308.50 | 199.50 | 284.50 | 322.00 | 340.50 | 384.31 | a | 437.62 | a | 449.00 | 430.00 | 424.50 | 328.39 | b | 225.02 | b | 4133.84 | |||||||||
| 1960 | 200.50 | 224.00 | 284.50 | 276.00 | 349.00 | 363.50 | 404.50 | 425.00 | 400.50 | 414.00 | 283.00 | 275.90 | a | 3900.40 | ||||||||||||
| 1961 | 260.00 | 235.00 | 246.00 | 268.00 | 311.00 | 341.00 | 363.50 | 387.50 | 353.00 | 391.50 | 276.50 | 204.50 | 3637.50 | |||||||||||||
| 1962 | 241.00 | 215.00 | 220.00 | 305.50 | 301.00 | 340.00 | 366.50 | 372.00 | 351.00 | 342.50 | 267.50 | 251.50 | 3573.50 | |||||||||||||
| 1963 | 278.00 | 337.00 | 311.50 | 302.50 | 303.50 | 330.00 | 377.50 | 376.81 | b | 419.00 | 385.50 | 321.00 | 319.00 | 4061.31 | ||||||||||||
| 1964 | 252.50 | 201.50 | 238.00 | 240.00 | 272.00 | 382.50 | 394.50 | 384.50 | 361.00 | 351.00 | 298.50 | 327.50 | 3703.50 | |||||||||||||
| 1965 | 266.00 | 136.00 | 212.00 | 278.00 | 366.00 | 320.00 | 389.00 | 391.50 | 416.50 | 387.50 | 340.00 | 206.50 | 3709.00 | |||||||||||||
| 1966 | 219.00 | 198.00 | 274.50 | 254.00 | 358.00 | 346.50 | 373.00 | 423.50 | 412.50 | 397.00 | 328.50 | 296.00 | 3880.50 | |||||||||||||
| 1967 | 210.50 | 226.50 | 277.50 | 285.50 | 364.00 | 380.00 | 440.50 | 437.50 | 418.00 | 417.50 | 292.76 | a | 273.50 | 4023.76 | ||||||||||||
| 1968 | 239.22 | a | 277.05 | a | 295.53 | a | 297.00 | 369.50 | 365.50 | 419.50 | 429.00 | 424.50 | 431.00 | 373.50 | 298.50 | 4219.80 | ||||||||||
| 1969 | 211.50 | 197.50 | 218.50 | 224.00 | 322.83 | b | 374.50 | 404.00 | 407.13 | a | 370.00 | 402.50 | 314.00 | 298.50 | 3744.96 | |||||||||||
| 1970 | 305.50 | 205.50 | 235.50 | 261.43 | b | 356.50 | c | 358.50 | 375.00 | 404.60 | b | 379.14 | a | 386.50 | 336.00 | 215.00 | 3819.17 | |||||||||
| 1971 | 255.50 | 230.00 | 242.50 | 275.00 | 276.50 | 319.00 | 369.50 | 377.00 | 378.75 | b | 354.00 | 343.00 | 199.50 | 3620.25 | ||||||||||||
| 1972 | 195.30 | a | 142.50 | f | 306.26 | b | 238.97 | a | 295.03 | b | 341.25 | b | 358.00 | 422.50 | 395.17 | a | 411.00 | 300.50 | 264.00 | 3527.98 | ||||||
| 1973 | 252.50 | 151.00 | 219.50 | 214.50 | 251.00 | 313.50 | 394.00 | 393.70 | a | 367.50 | b | 358.05 | a | 313.93 | b | 298.12 | a | 3527.30 | ||||||||
| 1974 | 335.00 | 241.63 | a | 297.08 | a | 299.48 | a | 327.00 | 351.96 | b | 368.90 | a | 421.50 | 392.07 | a | 387.00 | 285.00 | 248.00 | 3954.63 | |||||||
| 1975 | 209.52 | b | 202.00 | 190.00 | 213.00 | 237.50 | 276.50 | 332.14 | c | 363.73 | a | 338.57 | b | 341.50 | 302.59 | a | 259.00 | 3266.05 | ||||||||
| 1976 | 238.00 | 172.00 | 237.50 | 195.50 | 256.00 | 275.50 | 337.38 | a | 380.27 | a | 405.00 | 372.00 | b | 293.79 | a | 260.18 | c | 3423.12 | ||||||||
| 1977 | 247.00 | 242.50 | 205.50 | 275.50 | 295.02 | a | 351.21 | a | 264.00 | j | 347.64 | c | 0.00 | z | 397.83 | a | 321.00 | 244.90 | a | 2928.10 | ||||||
| 1978 | 253.34 | b | 154.50 | f | 261.00 | 302.40 | e | 370.00 | 358.00 | 406.00 | 453.00 | 398.79 | a | 413.33 | a | 361.11 | c | 213.38 | a | 3790.37 | ||||||
| 1979 | 153.00 | g | 187.38 | b | 240.85 | e | 283.20 | e | 317.20 | c | 325.34 | a | 422.78 | b | 453.00 | 458.50 | 457.00 | 352.50 | 341.00 | a | 3838.75 | |||||
| 1980 | 279.00 | 323.30 | b | 244.50 | 334.62 | d | 375.00 | 357.00 | 432.00 | 428.50 | 434.00 | 415.00 | 361.50 | 348.50 | 4332.91 | |||||||||||
| 1981 | 296.00 | 250.00 | 255.50 | 300.50 | 351.85 | a | 403.00 | 427.00 | 470.00 | 437.00 | 388.02 | a | 328.50 | 257.00 | 4164.37 | |||||||||||
| 1982 | 242.00 | 274.30 | a | 245.86 | b | 280.00 | 310.52 | a | 414.00 | 446.00 | 465.00 | 405.00 | 403.50 | 356.50 | 314.00 | 4156.67 | ||||||||||
| 1983 | 264.61 | c | 240.59 | a | 258.85 | a | 246.21 | a | 279.50 | 333.33 | c | 368.50 | 398.87 | a | 399.50 | 354.50 | 360.52 | a | 317.00 | 3821.97 | ||||||
| 1984 | 294.00 | 281.00 | 351.33 | a | 309.00 | 366.50 | 364.00 | 422.50 | 406.00 | 417.41 | a | 463.00 | 347.00 | 278.50 | 4300.25 | |||||||||||
| 1985 | 254.41 | b | 254.33 | d | 198.83 | b | 232.24 | a | 149.00 | m | 371.38 | a | 432.50 | 465.50 | 424.50 | 405.00 | 351.50 | 308.50 | 3698.70 | |||||||
| 1986 | 290.37 | a | 286.46 | b | 388.02 | a | 301.07 | b | 376.43 | c | 373.85 | d | 456.98 | b | 510.43 | b | 475.56 | c | 448.97 | b | 376.00 | 315.68 | a | 4599.81 | ||
| 1987 | 257.96 | c | 215.70 | a | 185.50 | f | 279.11 | b | 276.13 | d | 386.79 | b | 422.00 | 472.48 | b | 478.89 | c | 428.00 | 350.00 | c | 333.00 | 3900.06 | ||||
| 1988 | 318.50 | 284.82 | a | 292.90 | b | 287.31 | d | 386.95 | c | 396.00 | 414.00 | 448.47 | a | 436.03 | a | 457.50 | 402.69 | d | 342.03 | a | 4467.20 | |||||
| 1989 | 258.85 | a | 246.00 | 318.27 | a | 301.55 | a | 354.00 | 396.92 | d | 417.97 | b | 442.50 | 394.00 | 451.71 | c | 355.18 | b | 297.82 | c | 4234.77 | |||||
| 1990 | 276.50 | 149.33 | d | 254.95 | b | 321.96 | b | 331.38 | b | 345.52 | a | 418.00 | 459.83 | a | 431.50 | 382.50 | 364.29 | b | 280.55 | a | 4016.31 | |||||
| 1991 | 263.00 | 298.00 | 232.50 | 291.00 | 356.50 | 362.07 | a | 420.64 | b | 483.60 | a | 455.00 | 437.10 | a | 409.04 | d | 300.50 | 4308.95 | ||||||||
| 1992 | 252.50 | 237.00 | 274.35 | a | 196.50 | i | 300.00 | i | 406.03 | a | 452.60 | a | 461.00 | 490.00 | 493.62 | e | 284.50 | i | 323.50 | 3390.60 | ||||||
| 1993 | 270.70 | c | 204.30 | a | 287.00 | 317.00 | 326.00 | 396.50 | 416.50 | 469.43 | c | 454.62 | d | 438.65 | a | 326.38 | a | 248.00 | a | 4155.07 | ||||||
| 1994 | 241.00 | 277.00 | 265.00 | 301.00 | 344.00 | 386.00 | 487.50 | 476.50 | 452.00 | 427.50 | 315.52 | a | 266.50 | 4239.52 | ||||||||||||
| 1995 | 264.02 | a | 261.33 | a | 320.50 | 312.50 | 344.50 | 372.00 | 418.00 | 436.07 | a | 422.00 | 405.50 | 386.50 | 351.00 | 4293.92 | ||||||||||
| 1996 | 302.77 | a | 232.00 | a | 276.50 | 365.00 | 425.50 | 431.50 | 442.50 | 465.00 | 429.50 | 455.50 | 379.00 | 296.50 | 4501.27 | |||||||||||
| 1997 | 301.73 | a | 251.50 | 307.00 | 304.00 | 374.00 | 404.50 | 450.50 | 458.00 | 455.00 | 439.00 | 347.00 | 262.50 | 4354.73 | ||||||||||||
| 1998 | 263.00 | 244.00 | 311.00 | 253.00 | 286.50 | 358.50 | 401.00 | 441.00 | 398.50 | 402.50 | 325.50 | 257.50 | 3942.00 | |||||||||||||
| 1999 | 266.08 | a | 206.50 | 234.00 | 255.00 | 336.87 | a | 337.50 | 388.00 | 399.68 | c | 361.55 | a | 399.50 | 304.00 | 282.62 | a | 3771.30 | ||||||||
| 2000 | 209.00 | 275.00 | 277.97 | a | 248.50 | 364.50 | 372.93 | a | 419.61 | c | 452.08 | a | 411.50 | 425.00 | 348.10 | a | 329.63 | a | 4133.83 | |||||||
| 2001 | 291.40 | a | 228.48 | c | 264.53 | a | 271.03 | a | 336.00 | 374.50 | 435.07 | b | 470.50 | 438.10 | a | 403.52 | a | 396.72 | a | 284.68 | a | 4194.54 | ||||
| 2002 | 299.50 | 201.70 | a | 284.34 | b | 368.50 | 393.04 | c | 387.86 | b | 450.07 | d | 459.66 | b | 398.79 | a | 436.77 | c | 209.50 | m | 59.00 | x | 3680.23 | |||
| 2003 | 132.50 | q | 117.00 | o | 329.38 | c | 280.18 | b | 375.50 | 395.69 | a | 460.00 | 460.00 | 419.00 | 439.50 | 338.00 | 335.83 | a | 3833.08 | |||||||
| 2004 | 217.50 | i | 318.44 | c | 337.68 | c | 322.00 | 418.50 | c | 396.00 | 442.27 | a | 482.00 | 452.50 | 445.00 | 377.59 | a | 309.48 | a | 4301.46 | ||||||
| 2005 | 321.62 | c | 241.92 | c | 326.00 | 305.50 | 425.45 | b | 383.79 | a | 453.00 | 437.74 | b | 448.97 | a | 381.00 | 360.00 | 345.13 | a | 4430.13 | ||||||
| 2006 | 286.23 | a | 225.62 | b | 294.00 | 261.21 | a | 306.00 | 386.00 | 436.00 | 461.50 | 410.00 | 443.30 | a | 417.50 | 328.08 | a | 4255.44 | ||||||||
| 2007 | 276.00 | 210.00 | b | 294.00 | 259.82 | b | 338.50 | 379.50 | 450.00 | 419.50 | 423.21 | b | 386.98 | a | 361.00 | 287.55 | b | 4086.07 | ||||||||
| 2008 | 218.60 | b | 242.00 | 301.22 | a | 324.11 | b | 427.80 | a | 370.00 | 438.28 | b | 427.00 | 384.64 | b | 392.00 | 360.00 | b | 294.50 | b | 4180.15 | |||||
| 2009 | 248.00 | a | 148.50 | g | 200.98 | a | 258.21 | b | 393.38 | b | 396.21 | a | 432.97 | a | 474.50 | 409.00 | 462.13 | d | 361.67 | c | 355.98 | a | 3993.03 | |||
| 2010 | 302.85 | e | 238.00 | a | 253.34 | b | 279.23 | d | 358.57 | a | 376.11 | c | 400.33 | b | 421.00 | 394.20 | e | 398.72 | b | 340.00 | 326.03 | b | 4088.39 | |||
| 2011 | 230.00 | h | 302.81 | a | 307.33 | b | 306.72 | a | 350.30 | a | 358.97 | a | 365.44 | e | 407.81 | b | 362.07 | a | 359.50 | 294.23 | d | 266.71 | b | 3681.89 | ||
| 2012 | 280.79 | e | 232.56 | c | 209.77 | a | 80.00 | r | 281.77 | c | 247.00 | f | 329.12 | a | 353.83 | b | 310.18 | b | 354.84 | c | 188.50 | f | 243.23 | e | 2596.07 | |
| 2013 | 221.81 | b | 154.54 | b | 212.50 | 0.00 | z | 0.00 | z | 0.00 | z | 0.00 | z | 0.00 | z | 0.00 | z | 0.00 | z | 0.00 | z | 0.00 | z | 588.85 | ||
| Period of Record Statistics | ||||||||||||||||||||||||||
| MEAN | 258.91 | 231.09 | 263.67 | 279.59 | 333.59 | 360.96 | 407.31 | 428.11 | 407.14 | 404.01 | 335.53 | 283.67 | 3983.50 | |||||||||||||
| S.D. | 34.14 | 43.06 | 43.26 | 35.97 | 45.64 | 32.65 | 36.04 | 37.72 | 37.58 | 35.37 | 36.38 | 39.43 | 320.73 | |||||||||||||
| SKEW | -0.03 | 0.14 | 0.38 | 0.04 | 0.02 | -0.53 | -0.48 | -0.44 | -0.20 | 0.15 | -0.06 | -0.15 | -0.35 | |||||||||||||
| MAX | 335.00 | 337.00 | 388.02 | 368.50 | 427.80 | 431.50 | 487.50 | 510.43 | 490.00 | 493.62 | 417.50 | 355.98 | 4599.81 | |||||||||||||
| MIN | 191.00 | 136.00 | 190.00 | 195.50 | 237.50 | 275.50 | 307.00 | 323.00 | 310.18 | 337.50 | 252.00 | 199.50 | 3236.40 | |||||||||||||
| NO YRS | 60 | 60 | 62 | 61 | 60 | 62 | 62 | 63 | 62 | 64 | 61 | 63 | 48 | |||||||||||||