HEALDSBURG, CALIFORNIA

Monthly Total Heating Degree Days

(043875)

Base Temperature = 65 F

File last updated on Apr 4, 2013
*** Note *** Provisional Data *** After Year/Month 201208
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
1893 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 0.00 z 0.00 z 0.00 z 0.00
1894 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 0.00 z 0.00 z 0.00 z 0.00
1895 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 0.00 z 0.00 z 0.00 z 0.00
1896 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 0.00 z 0.00 z 0.00 z 0.00
1897 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 0.00 z 0.00 z 0.00 z 0.00
1898 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 0.00 z 0.00 z 0.00 z 0.00
1899 0.00 z 0.00 z 369.00 215.69 a 215.00 39.00 19.63 a 37.50 15.50 q 257.54 e 296.00 570.50 2019.86
1900 387.50 g 370.00 274.00 270.50 113.50 37.50 2.50 27.00 78.50 201.50 303.50 555.50 2234.00
1901 558.50 390.00 271.50 316.00 162.50 23.50 25.00 52.00 108.00 116.50 307.00 497.00 2827.50
1902 651.50 362.50 405.50 298.50 215.00 40.50 20.00 19.63 a 21.00 187.00 407.50 539.00 3167.63
1903 608.50 547.00 461.50 309.50 96.50 35.00 7.50 0.00 z 27.41 a 78.50 314.44 c 503.15 e 2989.01
1904 525.97 a 487.00 439.00 254.00 0.00 z 20.89 b 8.86 c 1.11 c 53.04 b 95.30 d 291.72 a 527.00 2703.88
1905 494.50 335.48 a 255.75 a 187.00 157.58 a 36.11 c 2.07 a 2.50 1.00 p 72.00 g 225.00 k 540.36 b 2011.35
1906 480.50 a 300.22 a 0.00 z 185.40 e 152.86 b 50.69 a 0.00 d 13.95 a 6.50 49.50 314.50 493.23 c 2047.36
1907 618.50 255.00 454.15 a 157.78 c 133.30 a 58.89 c 4.13 a 17.71 c 47.88 d 99.64 c 182.50 h 480.50 d 2327.49
1908 529.98 e 463.42 d 277.28 d 91.00 j 142.50 i 31.50 f 0.00 s 27.50 p 14.50 h 73.00 l 270.50 j 639.78 b 1910.45
1909 389.50 f 454.50 453.50 168.00 151.50 12.50 2.00 32.00 51.00 164.00 369.00 613.50 2471.50
1910 701.50 479.00 284.50 179.00 89.38 a 31.50 8.00 19.93 c 55.34 a 135.00 0.00 z 462.79 c 2445.94
1911 541.00 504.50 378.00 370.18 b 209.00 61.50 3.00 8.50 66.43 b 158.50 330.54 b 567.50 3198.64
1912 468.21 b 357.50 322.00 h 309.81 d 58.42 e 41.00 18.17 b 6.50 62.59 a 233.00 383.00 571.71 e 2509.91
1913 384.50 m 390.44 a 393.91 b 260.69 a 64.67 b 17.78 c 0.00 c 0.00 11.50 68.20 a 333.10 a 588.50 2128.80
1914 471.00 281.00 215.00 187.50 124.00 54.00 1.50 g 28.86 b 46.03 a 156.00 176.00 q 646.00 2209.40
1915 310.50 n 453.19 a 334.44 e 199.00 217.55 c 0.00 z 3.00 0.00 41.00 85.50 380.00 546.50 2260.18
1916 677.00 344.38 a 300.38 b 147.22 c 129.17 a 37.50 6.00 1.07 b 24.11 b 202.00 h 475.50 646.00 2788.32
1917 683.50 427.00 434.00 245.36 b 190.50 21.11 c 2.50 12.50 20.69 a 86.59 b 324.64 b 222.50 p 2448.39
1918 489.00 463.00 383.76 b 230.00 181.00 10.71 b 5.00 27.50 41.25 b 74.92 a 390.00 a 592.44 d 2888.58
1919 319.00 p 489.44 c 416.12 e 227.14 b 21.50 t 33.00 h 18.50 18.71 b 45.52 a 0.00 z 374.50 623.00 2212.92
1920 492.90 a 436.50 442.00 266.38 a 150.87 a 52.00 16.53 a 20.00 57.50 225.27 a 392.00 536.30 a 3088.25
1921 563.68 a 407.50 341.00 160.00 j 215.50 24.64 b 23.25 a 14.00 62.00 116.50 305.50 466.03 a 2539.61
1922 670.00 511.26 a 459.00 302.50 126.00 39.00 13.50 2.00 7.00 201.50 444.83 a 543.50 3320.09
1923 604.50 432.50 271.50 234.50 118.50 68.08 d 9.30 a 8.00 46.50 127.00 237.93 a 559.50 2717.81
1924 574.50 287.50 357.00 189.00 103.50 44.00 31.00 a 7.00 19.14 a 213.90 a 365.00 632.92 a 2824.45
1925 456.00 362.00 368.79 b 264.50 130.72 a 40.00 26.00 22.50 43.00 131.50 385.50 502.00 2732.51
1926 674.00 314.50 224.50 164.00 85.00 17.07 a 7.00 1.03 a 51.96 b 100.00 202.24 a 500.00 2341.31
1927 505.00 352.00 340.00 229.00 143.00 18.00 0.00 z 1.50 10.50 67.00 292.00 499.00 2457.00
1928 551.00 0.00 z 263.50 239.50 83.50 6.00 4.00 0.00 28.00 137.00 366.50 632.40 a 2311.40
1929 662.50 478.50 387.50 a 357.00 114.00 78.50 7.00 3.50 42.00 107.50 312.50 395.00 2945.50
1930 627.00 309.00 313.00 201.50 174.50 38.00 11.00 0.50 39.00 91.50 325.00 549.50 2679.50
1931 512.00 379.00 336.50 236.50 55.00 16.00 0.00 3.50 33.00 156.50 385.00 610.00 2723.00
1932 565.00 422.50 230.50 255.00 127.00 42.50 6.00 20.00 14.50 86.00 226.50 656.00 2651.50
1933 625.00 495.50 349.00 265.50 282.50 88.00 16.50 19.00 55.00 119.00 290.50 532.00 3137.50
1934 467.50 337.00 144.50 134.00 93.50 39.00 11.00 1.50 21.00 126.50 306.00 464.50 2146.00
1935 558.00 395.00 469.00 241.00 137.00 2.78 c 9.50 11.50 27.50 145.00 430.00 532.00 2958.28
1936 452.00 431.00 278.50 219.00 79.50 35.50 11.00 1.50 13.00 107.50 333.50 535.50 2497.50
1937 753.50 470.50 337.00 269.50 49.50 17.50 0.50 0.00 14.00 58.50 297.50 433.50 2701.50
1938 485.50 418.50 417.00 257.00 93.00 19.50 10.50 11.50 8.50 139.50 440.50 462.50 2763.50
1939 554.50 459.50 378.50 127.00 112.00 22.50 2.50 0.50 30.00 107.00 349.00 469.00 2612.00
1940 522.00 365.00 288.00 196.00 113.50 30.00 16.00 10.00 4.00 106.00 368.50 423.00 2442.00
1941 481.50 355.50 224.50 242.50 89.50 32.50 71.00 0.00 6.00 125.00 304.00 512.50 2444.50
1942 558.00 413.50 375.50 280.50 177.50 23.00 1.50 8.00 25.00 127.50 348.00 496.00 2834.00
1943 517.00 378.50 314.50 208.00 88.02 c 54.50 5.50 1.03 a 4.50 136.50 283.50 481.50 2473.05
1944 558.50 434.00 293.00 335.00 146.00 71.00 15.00 9.00 0.00 z 97.50 414.50 501.00 2874.50
1945 547.50 334.00 469.50 174.00 185.00 33.00 2.50 10.00 34.14 a 123.50 154.00 o 0.00 z 1913.14
1946 0.00 z 0.00 z 0.00 z 0.00 z 0.00 z 33.50 2.58 a 0.00 z 8.50 i 189.74 b 0.00 z 0.00 z 225.82
1947 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 0.00 z 0.00 z 0.00 z 0.00
1948 480.50 481.00 456.00 361.00 176.00 37.00 24.00 6.00 37.50 100.50 353.00 656.00 3168.50
1949 761.00 526.50 384.00 155.00 117.50 20.00 11.50 11.50 18.50 180.00 224.00 607.50 3017.00
1950 690.00 405.50 419.00 192.00 147.50 62.50 9.50 5.00 25.00 125.00 211.00 425.00 2717.00
1951 429.50 f 425.50 336.00 288.00 120.50 49.50 19.50 13.50 29.00 117.00 342.00 572.50 2313.00
1952 650.00 440.50 445.00 231.00 91.00 77.00 2.00 3.50 21.50 128.00 418.00 522.00 3029.50
1953 425.00 354.50 379.00 325.00 189.50 64.50 1.50 13.50 13.00 141.50 325.50 481.50 2714.00
1954 557.00 393.00 466.50 197.00 85.00 48.50 5.00 18.00 40.00 149.50 356.00 610.50 2926.00
1955 642.00 444.50 355.50 392.50 106.50 45.00 4.50 16.00 34.50 115.50 357.00 489.44 e 3002.94
1956 521.50 494.50 370.00 265.00 129.50 11.50 9.00 5.50 14.50 154.00 301.00 559.00 2835.00
1957 648.00 386.50 355.50 211.50 139.00 0.50 5.50 16.00 9.00 150.50 380.50 569.50 2872.00
1958 525.00 305.00 450.00 188.00 77.00 9.50 0.50 0.00 2.50 53.50 239.00 338.00 2188.00
1959 453.00 402.50 206.50 122.50 98.50 3.00 0.00 7.50 18.50 47.00 275.00 490.50 2124.50
1960 552.50 390.50 306.50 229.00 109.50 5.00 2.50 2.50 23.50 103.00 376.50 534.00 2635.00
1961 611.00 323.00 380.50 192.50 162.50 19.00 0.50 1.00 13.50 120.00 341.50 580.00 2745.00
1962 528.00 445.00 413.00 115.00 117.00 21.00 0.50 0.00 21.00 117.00 244.50 508.00 2530.00
1963 611.00 194.00 380.50 345.50 134.00 19.50 8.50 1.50 2.50 75.50 335.00 651.00 2758.50
1964 571.50 383.50 363.00 217.50 154.00 35.50 2.50 0.50 13.50 67.00 394.50 446.50 2649.50
1965 536.50 375.50 322.00 255.00 94.50 62.50 0.00 0.00 28.50 43.50 276.00 647.50 2641.50
1966 512.00 428.00 333.50 124.50 77.50 26.50 4.00 3.00 11.50 63.50 301.50 492.00 2377.50
1967 477.00 364.00 403.00 460.50 105.00 48.50 1.00 0.00 0.50 27.00 217.50 522.50 2626.50
1968 576.00 257.00 267.50 154.00 113.50 4.00 0.00 3.50 6.00 77.50 325.00 578.50 2362.50
1969 593.00 491.00 331.50 230.00 54.00 17.00 0.00 0.00 10.50 92.00 262.00 404.50 2485.50
1970 435.00 301.50 243.00 236.00 69.50 0.00 z 0.00 1.50 10.00 157.00 256.00 547.00 2256.50
1971 496.50 374.00 349.50 260.00 122.50 26.00 0.00 0.50 39.00 177.50 323.00 597.50 2766.00
1972 603.50 352.50 198.00 197.50 86.00 22.00 0.50 4.50 18.00 120.50 395.00 662.00 2660.00
1973 544.00 325.00 392.00 124.50 43.50 6.00 0.00 2.50 8.00 79.50 358.00 463.50 2346.50
1974 509.50 395.50 335.00 205.00 101.50 15.00 10.50 0.00 3.00 87.50 321.50 510.00 2494.00
1975 553.50 396.50 366.00 331.00 88.00 16.50 6.00 3.00 11.50 146.00 378.00 459.50 2755.50
1976 483.00 400.50 375.50 255.50 43.00 30.00 0.00 13.50 15.00 65.50 210.00 490.50 2382.00
1977 566.50 297.50 358.00 110.00 180.50 18.50 0.00 0.00 17.00 78.50 246.00 400.00 2272.50
1978 414.50 322.00 180.50 245.00 40.00 1.50 0.00 1.00 2.00 52.50 349.50 586.00 2194.50
1979 542.00 396.50 282.50 173.28 a 60.50 0.00 0.00 0.00 3.00 71.50 332.00 440.50 2301.78
1980 449.50 277.00 284.50 151.50 90.00 33.00 1.00 4.00 7.00 95.50 246.00 457.50 2096.50
1981 463.50 293.50 281.00 152.00 37.00 1.00 0.00 0.00 5.50 117.50 241.50 394.50 1987.00
1982 603.50 320.00 377.00 241.50 58.00 24.50 0.00 0.00 8.50 70.50 382.00 521.50 2607.00
1983 534.00 323.00 337.00 263.50 88.50 0.00 0.50 0.00 5.50 19.00 326.50 429.00 2326.50
1984 455.50 392.00 184.00 192.00 29.50 5.00 1.50 0.00 0.00 126.00 380.00 568.00 2333.50
1985 610.00 311.50 406.50 130.50 127.00 16.50 1.00 5.50 52.00 125.50 411.50 639.50 2837.00
1986 411.50 282.50 224.00 198.50 99.00 4.50 8.50 2.00 95.50 92.00 247.50 517.00 2182.50
1987 519.00 333.50 340.50 112.00 77.50 22.00 14.50 9.50 9.00 53.50 313.50 503.00 2307.50
1988 503.50 302.50 226.00 205.00 125.50 59.50 0.00 12.50 29.00 117.00 323.00 503.00 2406.50
1989 575.00 490.50 322.00 158.00 102.50 42.00 0.00 2.00 34.50 132.50 287.50 566.00 2712.50
1990 512.50 455.00 318.00 136.00 144.00 12.00 2.00 4.00 0.50 50.00 306.00 645.50 2585.50
1991 501.50 259.00 442.50 244.00 154.00 56.00 5.00 10.00 7.50 77.50 244.00 518.50 2519.50
1992 579.00 290.50 273.50 116.00 27.50 21.00 4.50 0.00 0.00 56.50 310.00 590.00 2268.50
1993 579.00 428.50 225.50 198.00 52.50 22.50 0.00 0.00 14.00 76.00 396.00 579.50 2571.50
1994 503.00 440.50 267.00 160.00 60.50 6.00 0.00 0.00 2.00 126.00 519.50 586.00 2670.50
1995 395.50 311.00 356.50 228.50 105.50 25.50 0.00 0.50 1.00 93.00 215.00 408.00 2140.00
1996 467.50 329.50 281.00 161.00 64.00 4.50 0.00 1.00 16.50 138.00 288.50 407.00 2158.50
1997 429.50 317.50 231.00 140.50 15.00 2.00 0.00 0.50 3.00 135.50 293.00 490.00 2057.50
1998 413.50 408.50 330.50 252.50 168.50 11.50 0.00 0.00 33.50 145.00 373.00 574.50 2711.00
1999 0.00 z 434.50 434.50 215.17 a 80.00 24.00 0.00 9.82 a 8.57 b 101.02 b 267.41 a 480.00 2054.99
2000 447.50 339.00 294.50 139.66 a 76.35 d 7.78 c 0.52 a 0.00 z 21.00 155.00 424.29 b 490.32 a 2395.90
2001 601.00 423.50 262.00 247.00 2.50 0.00 a 0.00 a 0.00 5.17 a 59.00 306.72 a 467.50 2374.40
2002 563.00 378.50 373.50 173.00 67.50 0.00 0.00 0.50 21.50 145.00 279.50 476.00 2478.00
2003 395.00 388.50 279.50 300.00 62.50 4.50 0.00 0.00 2.00 0.00 z 416.50 498.50 2347.00
2004 506.00 411.50 152.50 144.50 11.50 0.00 0.00 0.00 13.00 151.00 365.50 499.00 2254.50
2005 557.50 322.50 270.00 188.00 61.00 15.50 0.00 0.00 19.00 97.13 a 278.50 439.68 a 2248.82
2006 459.00 392.50 484.00 216.50 55.50 10.50 0.00 b 0.00 a 11.50 146.00 318.00 542.00 2635.50
2007 582.50 407.00 222.50 144.00 55.00 10.00 0.00 0.50 24.50 171.50 294.50 576.00 2488.00
2008 583.00 431.78 b 336.50 205.00 47.50 4.00 1.00 0.50 17.00 65.50 268.50 624.00 2584.28
2009 491.00 416.50 328.50 201.50 52.00 15.52 a 1.55 a 0.00 5.50 117.50 347.50 566.50 2543.57
2010 495.00 363.50 0.00 z 275.50 163.00 1.03 a 6.00 4.50 9.00 133.00 359.50 459.50 2269.53
2011 0.00 z 497.58 d 394.96 d 179.50 i 135.92 e 44.50 g 10.33 d 0.50 f 5.19 d 107.31 e 409.44 c 576.94 d 2137.69
2012 529.77 c 385.59 b 448.93 d 231.72 a 63.60 b 45.00 1.00 6.00 0.00 z 0.00 z 0.00 z 0.00 z 1711.61
Period of Record Statistics
MEAN 541.98 386.96 336.41 221.27 109.44 27.27 6.13 6.87 23.49 114.92 328.25 528.12 2594.89
S.D. 77.09 69.18 78.91 66.84 51.56 20.54 9.40 9.28 20.81 44.95 62.54 70.60 297.59
SKEW 0.46 -0.07 -0.20 0.69 0.49 0.70 3.56 2.03 1.45 0.53 0.19 -0.06 0.17
MAX 761.00 547.00 484.00 460.50 282.50 88.00 71.00 52.00 108.00 257.54 519.50 662.00 3320.09
MIN 395.00 194.00 144.50 110.00 2.50 0.00 0.00 0.00 0.00 19.00 202.24 338.00 1987.00
NO YRS 103 110 109 109 109 108 110 108 107 107 105 109 82