PETALUMA AP, CALIFORNIA

Monthly Total Heating Degree Days

(046826)

Base Temperature = 65 F

File last updated on Apr 4, 2013
*** Note *** Provisional Data *** After Year/Month 201303
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 348.50 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 348.50
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 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
1900 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
1901 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
1902 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
1903 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
1904 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
1905 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
1906 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
1907 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
1908 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
1909 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
1910 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
1911 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
1912 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
1913 0.00 z 101.00 i 459.50 366.00 232.00 121.00 34.00 30.00 38.00 141.00 424.00 539.00 2384.50
1914 482.50 410.50 293.00 276.50 219.50 146.50 58.50 56.00 106.50 171.50 364.50 634.00 3219.50
1915 557.50 410.00 346.50 302.50 306.00 136.50 48.00 30.50 77.00 135.00 394.00 542.50 3286.00
1916 657.00 349.50 393.00 296.00 296.50 154.50 45.50 50.50 66.50 300.00 481.00 655.00 3745.00
1917 685.00 450.00 540.00 386.00 353.50 118.50 19.50 72.00 73.50 147.50 329.00 485.00 3659.50
1918 543.00 488.00 447.50 361.00 349.50 83.50 81.50 185.50 207.50 266.50 526.00 723.50 4263.00
1919 670.00 546.50 562.00 414.50 257.00 143.50 79.50 65.50 105.50 248.50 415.00 623.00 4130.50
1920 546.00 475.50 456.50 218.00 142.50 50.50 36.00 15.50 70.00 184.50 336.50 462.50 2994.00
1921 626.50 299.50 245.50 230.00 203.50 40.50 12.50 12.00 41.00 52.00 248.50 357.00 2368.50
1922 519.50 346.00 321.00 240.00 171.00 82.50 38.50 53.00 39.50 187.00 443.50 543.00 2984.50
1923 626.50 463.50 358.50 337.50 239.50 185.00 62.00 43.50 43.00 93.00 134.00 425.50 3011.50
1924 488.50 271.50 390.50 230.00 113.00 72.00 60.00 41.00 60.00 223.00 373.50 601.50 2924.50
1925 411.50 393.50 437.00 345.00 236.00 124.50 51.50 70.00 74.00 154.00 257.50 540.00 3094.50
1926 516.00 370.50 380.50 209.50 181.50 48.50 19.50 28.50 105.00 90.50 231.50 526.00 2707.50
1927 0.00 z 0.00 z 0.00 z 0.00 z 0.00 z 0.00 z 0.00 z 0.00 z 34.00 p 105.00 300.50 554.50 960.00
1928 526.00 384.50 285.00 150.00 c 139.50 56.50 32.00 33.00 40.00 197.00 352.00 554.00 2749.50
1929 622.00 467.00 403.00 399.50 280.00 121.00 29.50 6.50 105.50 8.00 269.00 194.00 2905.00
1930 446.50 185.00 194.50 164.50 345.50 117.50 57.50 30.50 85.00 155.00 392.00 610.50 2784.00
1931 517.50 323.00 345.50 251.50 94.50 70.50 12.00 28.50 63.50 152.50 396.00 617.00 2872.00
1932 598.50 483.00 299.00 371.50 234.50 89.00 46.50 39.00 35.50 204.50 256.50 679.00 3336.50
1933 683.00 525.50 390.50 329.00 312.00 106.00 27.00 35.50 75.00 86.00 322.50 569.50 3461.50
1934 479.00 360.00 217.00 193.50 133.50 73.00 63.50 22.50 53.50 136.00 273.00 452.00 2456.50
1935 584.00 412.50 492.50 251.00 188.00 32.50 32.50 45.50 53.50 195.00 440.00 546.50 3273.50
1936 462.00 437.00 314.50 243.00 105.50 49.50 21.00 47.50 45.50 96.50 348.00 573.00 2743.00
1937 770.00 496.00 360.50 344.50 165.00 77.00 13.50 11.50 65.00 85.50 328.00 488.00 3204.50
1938 542.50 425.00 424.00 320.50 172.50 54.50 22.50 33.50 24.00 137.00 409.00 442.00 3007.00
1939 514.50 449.50 395.00 225.50 171.50 55.00 32.00 29.00 28.50 121.50 296.00 432.00 2750.00
1940 484.00 336.50 294.50 217.00 156.00 41.90 a 30.50 9.50 20.50 124.00 373.50 410.50 2498.40
1941 424.50 326.00 277.50 304.50 121.00 62.00 8.00 18.50 38.00 169.00 309.00 466.00 2524.00
1942 521.00 404.50 386.50 291.00 216.00 81.00 3.00 7.50 47.50 108.50 339.00 491.00 2896.50
1943 523.38 a 370.50 317.50 259.66 a 127.62 a 111.00 23.77 a 18.08 a 13.00 135.50 284.00 463.00 2647.01
1944 524.50 442.50 320.50 340.50 172.00 80.00 16.00 14.50 19.00 73.00 400.00 486.00 2888.50
1945 585.00 374.00 479.50 249.50 245.50 69.64 b 13.50 22.50 28.00 110.00 370.00 537.50 3084.64
1946 563.00 519.50 400.50 315.50 223.50 98.00 20.00 41.00 53.50 221.28 b 424.50 549.50 3429.78
1947 678.50 373.15 b 334.28 a 117.00 o 127.88 c 44.00 46.00 14.43 b 44.44 c 148.00 420.50 564.00 2795.19
1948 526.50 530.12 d 478.50 375.00 264.53 a 96.00 34.00 9.00 58.50 136.50 351.50 646.50 3506.65
1949 721.00 464.50 335.50 228.00 159.50 35.00 27.79 b 27.26 b 12.00 172.50 234.50 583.00 3000.55
1950 643.00 416.50 413.00 230.00 207.50 85.00 9.50 12.00 36.00 102.50 204.00 396.50 2755.50
1951 524.00 422.50 368.00 319.00 184.00 86.50 43.00 14.00 38.50 114.00 311.50 560.50 2985.50
1952 613.50 430.00 436.50 258.00 162.50 112.50 13.50 27.50 14.50 114.00 413.50 481.50 3077.50
1953 402.50 379.50 394.00 331.50 250.50 116.00 9.00 23.50 14.50 116.00 224.50 h 476.33 e 2513.33
1954 515.08 e 412.00 483.50 258.00 186.50 102.50 20.00 34.50 48.00 129.00 322.00 593.00 3104.08
1955 630.50 466.50 444.50 438.50 185.50 120.00 40.00 30.00 58.50 128.65 a 354.50 449.50 3346.65
1956 507.00 502.50 421.50 326.00 204.00 74.00 41.00 21.00 18.50 194.00 348.00 608.00 3265.50
1957 656.50 366.50 362.00 255.50 178.50 44.00 6.00 24.00 8.00 142.50 400.00 552.50 2996.00
1958 535.50 313.50 480.00 261.50 126.50 20.50 7.50 0.00 a 11.50 63.50 284.00 396.50 2500.50
1959 447.00 438.00 316.20 a 218.33 c 178.00 47.50 5.00 28.00 28.50 75.95 a 313.00 528.50 2623.98
1960 542.50 398.50 326.00 287.00 200.00 14.50 27.50 31.00 42.50 102.50 372.50 545.00 2889.50
1961 619.00 368.50 440.00 300.50 298.00 63.50 18.50 5.50 25.00 129.50 359.50 582.50 3210.00
1962 578.50 440.00 465.50 243.00 240.50 76.00 16.00 9.50 30.00 128.50 271.00 508.00 3006.50
1963 661.00 252.00 442.50 385.50 208.50 77.00 41.00 20.00 7.50 113.50 367.00 670.00 3245.50
1964 598.00 430.00 449.00 329.50 276.50 120.50 28.50 11.50 60.00 80.00 407.50 448.50 3239.50
1965 536.00 417.50 404.00 294.50 241.80 a 135.50 29.00 2.00 51.00 54.00 285.00 680.00 3130.30
1966 534.00 466.50 391.00 204.50 173.50 72.00 47.50 21.00 27.00 106.50 326.00 534.50 2904.00
1967 517.50 440.00 438.50 503.00 198.50 121.50 10.50 0.00 z 2.00 68.50 261.00 567.00 3128.00
1968 623.50 296.50 332.50 264.00 202.50 58.50 15.50 18.50 20.50 152.50 366.00 590.00 2940.50
1969 616.00 499.50 411.00 335.00 127.00 65.00 6.00 11.50 23.28 a 129.00 340.50 425.14 c 2988.92
1970 433.50 345.00 294.50 364.50 139.50 56.00 17.00 24.00 34.50 193.50 281.50 584.50 2768.00
1971 560.50 445.50 438.00 353.50 224.00 89.50 15.00 2.50 44.50 216.50 362.00 612.50 3364.00
1972 660.00 384.50 273.50 273.00 165.50 65.50 20.00 11.00 35.50 127.00 411.00 670.00 3096.50
1973 565.00 357.00 435.00 220.00 138.00 49.00 17.00 35.00 41.50 118.50 342.50 480.50 2799.00
1974 502.50 431.00 349.00 275.00 221.50 58.50 21.50 4.50 14.50 101.50 344.50 535.00 2859.00
1975 594.00 418.50 386.00 407.50 167.00 79.50 35.00 15.50 35.50 165.00 419.00 510.50 3233.00
1976 549.00 405.50 441.00 331.50 130.00 96.50 9.50 13.50 17.50 98.50 253.00 575.00 2920.50
1977 622.00 352.00 456.50 227.00 262.50 65.00 17.00 8.50 35.50 130.00 302.50 447.00 2925.50
1978 433.50 356.50 261.50 295.00 119.50 59.50 14.00 14.00 25.00 94.50 408.00 665.98 a 2746.98
1979 579.50 457.00 351.00 284.00 120.50 67.00 19.50 16.00 4.00 115.50 368.00 515.00 2897.00
1980 517.00 335.50 384.50 262.50 221.50 110.00 34.00 24.00 24.50 143.50 312.00 512.00 2881.00
1981 492.50 340.50 384.40 a 260.50 138.50 20.00 17.00 13.00 25.50 192.50 281.50 441.00 2606.90
1982 653.50 372.00 439.50 267.50 170.50 130.50 27.00 29.50 28.50 150.00 475.00 601.00 3344.50
1983 0.00 z 376.00 386.00 341.00 211.50 63.50 25.00 0.00 13.50 57.50 358.50 445.50 2278.00
1984 518.00 445.50 272.50 286.50 85.50 55.00 3.50 7.50 12.00 182.50 397.00 598.00 2863.50
1985 652.00 386.00 445.00 172.00 213.00 27.50 7.50 29.50 67.50 162.00 456.00 641.00 3259.00
1986 421.00 290.50 242.00 257.00 158.50 23.50 11.50 5.50 107.50 107.00 297.50 541.50 2463.00
1987 561.50 371.00 361.50 161.50 89.50 22.50 35.50 13.00 10.00 58.00 332.00 533.00 2549.00
1988 524.50 351.00 255.50 216.50 178.00 64.50 9.00 9.00 38.00 125.50 337.00 533.00 2641.50
1989 611.00 521.50 353.00 173.50 149.00 54.50 9.50 5.00 32.00 152.50 327.50 596.00 2985.00
1990 536.50 491.50 353.50 143.50 156.50 37.00 0.00 0.00 z 3.00 0.00 z 0.00 z 0.00 z 1721.50
1991 513.00 271.50 436.50 273.50 199.50 90.50 1.50 r 0.00 z 0.00 z 0.00 z 0.00 z 0.00 z 1784.50
1992 590.00 326.50 299.50 211.03 a 81.00 50.50 11.50 11.00 31.50 67.50 304.50 594.00 2578.53
1993 587.50 437.00 293.00 287.00 156.50 62.50 9.50 19.00 39.00 98.50 393.00 599.00 2981.50
1994 508.50 477.50 330.00 296.50 204.50 88.50 41.00 23.50 38.00 158.50 508.00 613.50 3288.00
1995 408.00 313.00 396.00 326.50 248.50 114.50 29.50 25.50 36.00 102.50 210.50 432.50 2643.00
1996 497.50 317.00 311.00 235.00 171.50 64.50 20.50 29.00 33.50 155.50 295.50 425.00 2555.50
1997 473.50 380.50 300.50 218.50 93.50 31.50 2.50 1.50 4.50 111.00 247.50 479.00 2344.00
1998 408.00 387.00 387.50 409.50 135.50 n 88.00 18.00 5.50 28.00 m 122.50 352.50 584.50 2763.00
1999 539.63 d 435.00 455.50 290.00 246.00 0.00 z 51.50 23.50 22.50 72.00 273.50 478.00 2887.13
2000 458.50 350.50 0.00 z 220.50 155.00 g 71.50 53.50 18.00 32.50 155.00 a 411.50 475.00 2246.50
2001 551.50 0.00 z 296.00 355.50 68.50 41.00 23.00 21.59 c 12.41 a 76.50 299.50 485.00 2230.50
2002 574.50 378.50 408.00 254.50 195.00 42.50 5.50 22.00 31.50 151.50 279.00 469.50 2812.00
2003 402.50 410.50 320.50 375.50 171.50 60.00 10.00 3.50 19.00 57.50 423.00 483.00 2736.50
2004 520.00 453.00 196.00 200.50 124.00 45.00 4.50 2.50 25.00 178.00 382.00 502.00 2632.50
2005 590.50 356.50 296.00 307.00 148.50 69.50 4.00 f 19.00 63.50 130.50 308.00 454.50 2743.50
2006 479.50 410.50 500.00 282.50 149.50 32.50 15.00 19.00 40.18 b 159.00 351.00 560.50 2999.18
2007 604.00 421.00 287.27 a 268.50 165.50 60.50 13.50 13.50 46.50 185.00 354.50 584.00 3003.77
2008 590.55 a 453.50 415.50 311.50 170.00 64.00 26.50 12.50 43.00 89.00 291.00 635.00 3102.05
2009 523.50 440.00 380.00 325.50 153.50 82.50 37.00 21.50 13.00 154.48 a 391.50 591.50 3113.98
2010 516.00 386.50 389.50 359.00 265.50 60.50 30.50 n 57.50 29.00 135.00 370.50 466.50 3035.50
2011 558.00 a 488.92 b 409.95 b 307.78 c 260.83 b 99.23 d 31.53 b 13.43 a 19.14 a 140.61 c 438.00 534.50 3301.92
2012 526.50 411.00 436.00 270.50 171.50 80.50 23.50 11.00 59.50 110.50 295.50 538.00 2934.00
2013 619.00 91.50 v 28.50 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 619.00
Period of Record Statistics
MEAN 550.55 402.67 374.26 286.12 189.60 75.86 25.89 23.93 40.93 132.84 344.33 532.47 2986.59
S.D. 75.84 66.89 74.50 67.65 60.96 33.69 17.36 22.73 29.85 48.90 68.75 82.62 346.08
SKEW 0.18 -0.32 -0.14 0.34 0.53 0.62 0.97 4.05 2.25 0.55 -0.03 -0.56 0.95
MAX 770.00 546.50 562.00 503.00 353.50 185.00 81.50 185.50 207.50 300.00 526.00 723.50 4263.00
MIN 402.50 185.00 194.50 143.50 68.50 14.50 0.00 0.00 2.00 8.00 134.00 194.00 2344.00
NO YRS 98 97 99 98 97 98 96 96 97 98 97 98 86