MOUNT DIABLO JUNCTION, CALIFORNIA

Monthly Total Heating Degree Days

(045915)

Base Temperature = 65 F

File last updated on Jul 24, 2006
*** Note *** Provisional Data *** After Year/Month 200603
a = 1 day missing, b = 2 days missing, c = 3 days, ..etc..,
z = 26 or more days missing, A = Accumulations present
Long-term means based on columns; thus, the monthly row may not
sum (or average) to the long-term annual value.
Months with 5 missing days or less use mean for missing day(s)
Individual Months not used for annual or monthly statistics if more than 5 days are missing.
Individual Years not used for annual statistics if any month in that year has more than 5 days missing.
YEAR(S JAN FEB MAR APR MAY JUN JUL AUG SEP OCT NOV DEC ANN
1952 0.00 z 0.00 z 0.00 z 343.00 178.00 211.00 14.00 17.50 42.00 72.00 396.00 619.00 1892.50
1953 482.50 406.50 531.00 379.50 375.00 195.00 11.00 64.50 49.00 145.50 353.00 419.00 3411.50
1954 620.50 309.00 598.50 271.50 164.00 157.00 4.50 84.00 67.00 155.50 291.50 565.50 3288.50
1955 683.50 513.50 472.50 518.50 254.00 149.00 77.00 5.50 50.00 106.00 395.00 569.00 3793.50
1956 611.50 616.00 502.00 369.00 251.00 102.00 36.50 23.00 30.50 200.50 223.50 364.50 3330.00
1957 680.50 462.52 a 477.50 335.00 312.50 37.00 9.50 28.50 46.00 214.50 399.00 459.50 3462.02
1958 499.50 430.00 617.00 315.00 126.50 91.00 0.00 z 0.00 29.00 61.50 259.00 253.50 2682.00
1959 482.50 550.50 313.50 134.50 232.00 46.00 0.50 23.50 64.50 95.50 129.00 421.00 2493.00
1960 647.50 511.00 402.50 342.50 272.00 18.50 2.50 17.00 28.00 159.00 450.50 529.00 3380.00
1961 437.50 463.00 565.00 293.50 314.00 93.62 a 13.43 a 1.55 a 51.50 191.00 365.50 553.50 3343.10
1962 507.50 536.50 587.00 248.28 a 303.00 84.50 8.00 28.50 43.00 192.50 287.00 407.50 3233.28
1963 604.00 294.00 519.50 541.00 297.50 80.00 31.50 16.00 21.50 159.00 394.00 425.50 3383.50
1964 590.00 419.50 494.00 343.00 294.50 143.00 25.50 6.00 68.00 81.00 477.50 547.00 3489.00
1965 555.50 380.00 469.50 387.00 212.35 a 166.50 20.50 2.50 78.62 a 54.00 356.00 579.50 3261.97
1966 568.50 524.50 400.50 166.00 162.50 81.00 22.00 9.50 22.00 79.50 340.50 508.50 2885.00
1967 462.00 350.50 496.00 640.00 203.00 154.50 0.00 0.00 0.00 59.50 217.00 590.50 3173.00
1968 538.00 355.00 380.00 262.00 226.00 44.50 10.50 49.50 24.00 132.50 379.50 646.50 3048.00
1969 591.50 620.00 461.50 361.55 a 142.00 f 144.00 5.00 0.00 18.50 200.47 a 225.00 456.50 3084.02
1970 524.00 354.00 357.50 379.00 171.50 92.00 0.00 4.00 20.00 180.00 303.00 652.50 3037.50
1971 517.50 402.50 496.00 406.00 292.50 112.00 1.50 4.00 64.00 246.00 370.50 735.00 3647.50
1972 606.50 442.00 274.50 323.00 196.00 28.80 e 17.00 22.50 50.00 c 185.50 453.00 695.50 3294.30
1973 655.00 463.00 604.00 294.50 158.50 78.50 14.00 20.00 57.00 147.00 549.00 509.50 3550.00
1974 670.50 531.00 543.50 406.55 a 245.50 50.00 46.50 2.00 1.03 a 128.50 367.50 592.50 3585.09
1975 524.00 503.50 591.50 525.00 185.50 86.00 44.00 17.00 0.00 a 200.50 385.50 407.50 3470.00
1976 370.00 440.50 456.50 337.50 f 136.50 104.50 o 3.21 b 57.00 17.50 48.10 b 223.00 284.50 2036.81
1977 502.72 a 292.96 a 503.50 157.00 373.03 a 65.89 b 19.50 9.62 b 65.50 87.00 232.00 424.00 2732.73
1978 493.00 445.00 343.00 409.50 163.50 41.50 19.50 15.50 39.00 47.50 391.50 589.50 2998.00
1979 622.50 508.50 457.50 328.50 151.50 28.00 14.50 42.50 5.00 155.50 403.50 390.00 3107.50
1980 548.50 403.50 509.00 348.00 330.50 208.00 53.00 35.13 a 48.00 0.00 z 244.00 407.50 3135.13
1981 399.00 410.50 513.00 318.00 170.00 33.00 5.17 a 12.50 23.00 222.00 338.50 468.50 2913.17
1982 667.00 438.50 601.00 379.50 197.50 187.50 59.00 12.50 69.50 140.50 451.50 568.50 3772.50
1983 440.00 464.50 517.50 464.00 235.50 106.00 91.50 20.50 33.50 62.00 432.00 575.50 3442.50
1984 469.50 487.00 325.00 380.50 143.50 93.50 5.00 9.50 0.50 225.50 487.00 645.00 3271.50
1985 564.50 398.50 568.50 202.00 252.65 a 39.00 3.00 34.00 136.00 211.50 507.50 446.00 3363.15
1986 403.00 431.00 334.50 347.50 208.00 88.50 25.00 4.00 171.00 107.50 0.00 z 496.50 2616.50
1987 605.50 429.00 485.00 167.00 203.80 d 64.00 108.50 44.00 48.50 0.00 z 0.00 z 651.00 2806.30
1988 585.00 323.50 0.00 z 0.00 z 276.50 114.50 5.50 49.00 34.00 117.00 489.50 531.50 2526.00
1989 630.50 631.00 521.00 291.00 235.00 131.50 16.00 22.00 85.00 173.50 252.00 391.00 3379.50
1990 569.50 570.50 417.50 272.50 294.50 92.50 4.50 44.00 15.00 56.00 273.00 640.00 3249.50
1991 521.00 297.11 a 635.50 391.00 307.50 160.50 14.00 0.00 z 6.50 138.00 282.50 489.50 3243.11
1992 545.00 434.00 460.00 233.50 60.50 121.00 37.50 8.50 20.00 110.00 283.00 614.50 2927.50
1993 656.00 519.50 350.00 347.00 222.50 99.50 6.50 43.00 41.00 121.00 362.50 598.82 a 3367.32
1994 472.00 574.50 371.00 335.00 287.50 73.00 4.50 13.50 46.00 180.50 605.00 623.00 3585.50
1995 626.00 396.00 553.50 421.00 386.50 185.50 42.50 6.00 28.00 76.50 174.50 489.59 b 3385.59
1996 483.50 438.00 395.00 274.50 194.50 83.50 0.00 19.00 27.00 204.50 372.00 511.50 3003.00
1997 558.00 414.50 294.50 293.50 65.00 64.50 6.00 12.00 14.00 157.00 343.00 541.50 2763.50
1998 569.00 577.50 478.00 411.00 459.50 203.50 36.00 3.50 85.50 176.50 452.50 623.00 4075.50
1999 527.00 552.00 609.50 410.00 262.00 120.50 62.00 39.50 1.50 45.00 298.50 465.00 3392.50
2000 581.00 522.50 457.50 290.00 231.00 69.50 80.00 19.50 78.50 225.50 511.00 493.00 3559.00
2001 607.50 617.50 402.00 473.00 83.00 65.50 81.50 37.00 38.50 137.00 419.00 682.50 3644.00
2002 662.00 438.00 480.00 355.50 238.00 43.50 1.00 16.50 28.00 177.50 301.50 577.50 3319.00
2003 390.50 495.00 421.50 536.00 264.00 97.00 2.00 16.00 20.50 39.50 512.50 635.50 3430.00
2004 643.50 577.00 222.00 276.00 245.00 79.50 5.50 20.50 53.00 282.50 500.50 623.50 3528.50
2005 643.00 529.50 451.00 434.50 270.00 177.00 0.00 1.50 100.00 181.00 360.50 553.00 3701.00
2006 630.00 457.50 712.50 492.00 182.38 a 0.00 z 0.00 z 0.00 z 0.00 z 0.00 z 0.00 z 0.00 z 2474.38
Period of Record Statistics
MEAN 556.39 462.09 471.71 351.38 232.56 101.55 23.15 21.02 42.67 141.40 362.89 528.48 3321.59
S.D. 81.18 87.47 101.76 102.60 79.19 52.03 26.65 18.34 32.97 61.11 102.73 103.57 304.34
SKEW -0.41 -0.03 -0.19 0.27 0.24 0.51 1.50 1.22 1.50 0.00 0.03 -0.42 -0.37
MAX 683.50 631.00 712.50 640.00 459.50 211.00 108.50 84.00 171.00 282.50 605.00 735.00 4075.50
MIN 370.00 292.96 222.00 134.50 60.50 18.50 0.00 0.00 0.00 39.50 129.00 253.50 2493.00
NO YRS 54 54 53 53 54 53 53 53 54 52 52 54 45