SONOMA, CALIFORNIA

Monthly Total Heating Degree Days

(048351)

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 295.00 m 460.57 c 272.14 b 191.34 b 135.56 c 13.29 c 6.41 b 30.50 146.00 479.00 527.00 2261.81
1953 460.00 413.50 459.00 345.50 280.00 128.50 7.50 34.50 31.50 206.00 370.50 527.50 3264.00
1954 571.00 441.00 495.50 241.00 156.00 104.50 28.00 66.50 78.00 218.00 397.00 630.00 3426.50
1955 686.50 497.00 441.00 427.00 147.00 88.50 32.50 40.00 54.00 158.00 402.00 467.58 a 3441.08
1956 527.00 535.00 423.50 291.50 162.50 58.50 8.50 11.00 24.50 219.00 366.00 627.00 3254.00
1957 692.50 371.50 380.00 233.00 154.50 15.50 0.50 30.00 18.00 184.00 431.00 573.00 3083.50
1958 583.00 321.50 479.50 254.50 106.50 27.00 8.50 0.00 16.00 106.71 e 325.50 445.50 2674.21
1959 479.00 296.50 j 290.50 170.00 150.50 42.00 2.00 9.30 a 32.88 d 93.50 367.76 a 560.50 2197.94
1960 353.00 j 411.37 b 327.05 a 278.00 177.00 4.00 8.50 6.50 43.50 152.00 412.00 566.00 2385.92
1961 616.00 363.00 419.50 253.50 241.00 35.77 d 14.00 7.50 45.00 167.00 388.50 624.00 3174.77
1962 612.50 454.00 451.50 203.00 198.00 38.50 6.00 7.50 33.50 144.00 326.50 539.00 3014.00
1963 693.00 240.00 434.00 377.00 156.50 40.50 26.50 8.50 4.00 125.50 397.50 676.00 3179.00
1964 602.00 424.00 418.50 287.50 229.00 88.50 21.00 9.50 57.41 a 89.50 431.50 461.50 3119.91
1965 568.00 403.00 393.50 278.50 150.00 80.50 13.50 3.50 72.00 65.00 342.00 693.50 3063.00
1966 561.00 473.50 362.50 164.50 121.50 60.00 32.00 16.00 25.00 108.50 355.50 553.50 2833.50
1967 531.50 445.50 439.50 495.50 164.00 81.50 3.00 0.00 2.50 82.50 298.50 605.00 3149.00
1968 661.00 302.50 337.50 234.00 173.50 34.50 0.50 11.00 20.50 155.50 372.00 629.50 2932.00
1969 637.50 502.00 385.00 319.50 90.00 33.50 0.00 3.00 27.50 169.50 377.50 449.50 2994.50
1970 465.00 354.50 311.00 365.00 107.50 35.00 7.50 18.00 33.50 207.00 322.50 590.50 2817.00
1971 559.50 443.50 408.50 344.50 206.50 67.00 2.50 5.00 58.50 219.00 428.00 664.50 3407.00
1972 700.50 385.00 264.00 249.50 109.50 24.50 1.50 15.00 27.00 119.00 413.00 663.00 2971.50
1973 560.00 339.50 415.50 137.14 b 78.00 13.00 3.50 10.00 13.50 90.50 354.50 476.00 2491.14
1974 488.50 423.63 a 343.00 249.00 137.50 16.50 20.50 0.00 0.50 80.00 361.00 557.00 2677.13
1975 569.00 420.00 372.50 392.50 100.50 31.50 22.00 0.50 0.00 141.50 368.50 466.00 2884.50
1976 512.50 421.00 389.50 301.50 112.00 89.00 9.50 23.00 13.00 68.00 286.00 510.50 2735.50
1977 489.50 f 325.00 392.50 146.00 223.50 18.50 6.00 0.00 23.50 64.50 267.00 388.00 1854.50
1978 394.65 e 333.00 206.50 282.00 48.50 23.00 7.23 a 1.50 5.00 53.98 b 387.00 637.50 2379.87
1979 537.50 397.00 323.00 217.50 91.21 e 14.48 a 2.14 b 5.50 1.50 0.00 z 365.50 487.22 a 2442.55
1980 469.13 a 264.00 320.50 237.00 168.36 b 0.00 z 17.00 9.50 17.59 a 127.50 277.50 499.00 2407.08
1981 475.50 328.00 368.50 240.00 116.50 0.00 1.50 4.00 7.50 138.00 219.64 b 437.50 2336.64
1982 631.50 339.50 419.50 291.50 131.00 90.00 10.00 5.00 16.00 110.00 473.50 531.50 3049.00
1983 555.00 344.50 353.50 322.50 155.00 11.50 17.50 0.00 3.00 27.50 335.50 427.00 2552.50
1984 481.50 418.50 233.00 267.50 0.00 z 28.00 8.00 0.00 1.00 142.50 393.50 589.00 2562.50
1985 674.00 356.00 0.00 z 0.00 z 0.00 z 0.00 z 0.00 z 11.50 59.00 158.50 467.50 676.50 2403.00
1986 430.50 294.00 232.50 248.00 120.00 17.50 5.50 1.00 94.50 80.00 259.00 556.50 2339.00
1987 547.50 357.00 355.00 135.00 97.50 14.00 20.00 3.00 9.50 54.50 354.50 520.00 2467.50
1988 520.50 352.00 268.00 212.50 158.00 54.00 1.50 4.00 27.00 87.00 332.00 545.00 2561.50
1989 607.50 504.50 342.00 164.50 137.00 18.50 2.00 1.00 30.00 142.50 318.50 589.00 2857.00
1990 533.00 478.50 337.00 135.50 144.50 20.00 3.00 2.00 0.50 72.50 336.50 680.50 2743.50
1991 528.00 278.50 442.50 287.00 179.50 69.50 2.00 7.00 11.00 80.00 292.76 a 559.00 2736.76
1992 625.17 a 325.50 315.50 142.50 26.50 25.00 0.50 0.00 5.00 60.00 308.00 600.00 2433.67
1993 608.00 465.00 262.50 238.00 82.00 32.00 0.00 3.62 a 23.50 64.50 378.00 597.00 2754.12
1994 533.00 449.00 273.50 215.00 116.00 14.00 4.50 0.50 7.00 111.00 491.00 596.00 2810.50
1995 435.00 299.00 371.00 241.00 151.50 51.50 2.00 6.00 7.00 77.50 215.00 407.00 2263.50
1996 489.00 336.50 303.00 218.00 120.50 19.66 a 0.00 0.50 12.00 125.50 308.00 442.00 2374.66
1997 495.00 362.50 269.50 160.50 44.00 3.00 0.00 0.50 2.50 84.00 275.50 529.50 2226.50
1998 467.00 412.00 332.00 278.00 246.50 40.50 1.50 0.50 28.00 123.00 374.00 631.50 2934.50
1999 576.60 a 441.00 461.50 252.00 174.00 55.00 8.00 0.50 6.00 81.00 288.62 a 502.41 b 2846.63
2000 467.07 a 373.50 315.50 203.00 131.50 24.50 12.00 4.00 11.50 127.50 437.14 b 536.30 a 2643.51
2001 599.33 a 431.00 281.50 304.50 23.00 10.00 3.00 0.00 2.59 a 62.50 296.90 a 486.18 a 2500.50
2002 571.43 a 369.00 386.00 242.00 157.50 8.00 0.00 2.00 23.50 121.00 271.50 488.50 2640.43
2003 411.50 398.00 309.00 380.00 146.50 26.00 1.00 1.00 5.50 37.50 415.50 501.17 a 2632.67
2004 521.83 a 414.50 176.50 206.00 95.50 8.50 0.00 0.00 17.00 161.50 362.50 508.83 b 2472.66
2005 577.00 342.50 302.00 294.00 140.50 47.00 0.00 0.50 47.00 112.50 286.00 468.10 a 2617.10
2006 493.50 400.00 508.50 283.50 96.50 0.00 z 0.00 z 0.00 z 0.00 z 0.00 z 0.00 z 0.00 z 1782.00
Period of Record Statistics
MEAN 549.86 388.20 358.59 259.43 140.06 40.72 8.09 7.72 23.46 117.04 354.84 546.31 2799.15
S.D. 76.03 65.36 76.35 75.66 52.88 32.20 8.81 11.90 21.61 48.57 63.69 77.10 322.77
SKEW 0.15 0.01 -0.16 0.61 0.17 1.16 1.26 2.98 1.27 0.42 0.01 0.06 0.19
MAX 700.50 535.00 508.50 495.50 280.00 135.56 32.50 66.50 94.50 219.00 491.00 693.50 3441.08
MIN 394.65 240.00 176.50 135.00 23.00 0.00 0.00 0.00 0.00 27.50 215.00 388.00 2226.50
NO YRS 52 53 54 54 53 52 53 54 54 53 54 54 46