SAINT HELENA, CALIFORNIA

Monthly Total Heating Degree Days

(047643)

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
1931 0.00 z 275.50 i 289.00 189.50 106.50 44.50 3.00 23.50 71.00 233.00 449.50 652.00 2061.50
1932 621.00 510.00 295.61 c 314.50 126.50 25.00 0.50 g 0.00 24.00 147.00 236.90 a 738.46 c 3038.97
1933 740.50 513.00 384.50 277.50 317.75 a 74.50 4.50 7.00 25.50 104.50 267.50 571.50 3288.25
1934 505.00 412.50 193.50 190.50 85.50 43.50 8.00 0.00 51.00 160.50 332.50 548.00 2530.50
1935 609.00 456.50 545.00 279.00 185.00 6.00 9.50 3.50 43.00 196.00 428.00 557.50 3318.00
1936 495.50 459.00 338.50 261.72 a 110.00 28.00 11.50 0.00 33.50 126.00 370.50 610.00 2844.22
1937 842.50 513.50 385.50 343.50 108.50 46.55 a 0.00 3.00 43.50 102.50 291.00 450.50 3130.55
1938 596.50 465.00 482.50 313.00 96.50 18.50 8.00 5.50 17.50 180.50 385.50 486.50 3055.50
1939 575.00 504.50 383.50 142.00 109.00 36.50 0.50 1.00 28.50 141.50 318.00 453.50 2693.50
1940 495.00 381.50 320.00 216.00 70.50 4.00 4.00 6.00 27.50 148.00 390.00 454.50 2517.00
1941 497.50 384.50 313.00 302.00 118.50 47.00 1.00 5.00 36.00 205.50 330.50 530.50 2771.00
1942 554.50 451.00 427.50 294.00 212.50 8.50 0.00 5.50 38.50 143.50 393.50 548.50 3077.50
1943 523.00 401.50 351.00 211.50 82.00 63.00 1.00 2.50 7.50 171.00 324.00 504.50 2642.50
1944 578.50 488.00 345.50 343.00 125.00 67.50 2.50 3.50 21.00 123.50 433.00 480.50 3011.50
1945 599.50 396.50 505.00 208.00 173.08 a 36.50 0.00 3.50 25.00 115.50 404.00 538.50 3005.08
1946 592.50 547.62 b 425.50 253.00 122.00 47.00 4.50 6.50 13.50 218.00 428.50 558.50 3217.12
1947 704.00 390.50 332.50 173.50 54.50 37.50 0.50 8.00 25.50 162.00 435.50 608.00 2932.00
1948 472.50 538.00 512.50 387.50 208.00 22.50 13.00 2.00 56.50 146.00 387.50 713.50 3459.50
1949 800.00 565.00 432.00 172.00 122.00 17.50 3.50 7.50 14.50 194.50 255.50 625.00 3209.00
1950 723.00 448.50 446.00 201.50 134.00 50.50 0.00 2.00 31.50 152.00 247.00 465.50 2901.50
1951 584.50 460.00 381.50 269.00 123.00 22.50 7.50 6.50 26.50 159.00 368.50 607.00 3015.50
1952 678.00 482.00 491.50 219.00 119.50 77.50 0.00 0.50 19.50 122.00 428.50 539.18 c 3177.18
1953 438.50 383.50 410.50 302.07 a 228.00 68.00 0.00 10.00 24.50 168.50 343.50 316.00 j 2377.07
1954 582.00 417.50 490.00 210.50 78.05 c 58.39 b 0.00 i 22.00 47.00 163.50 379.50 627.00 3075.45
1955 674.00 499.15 b 402.50 416.50 111.00 34.00 7.00 g 3.32 c 31.50 114.00 388.00 485.50 3159.48
1956 544.00 526.00 400.00 282.41 a 134.33 a 20.36 b 0.00 g 2.50 14.50 187.00 287.00 561.50 2959.60
1957 694.83 b 387.00 370.50 226.55 a 156.07 b 3.75 b 0.00 13.00 17.00 192.72 a 409.00 550.50 3020.92
1958 545.00 332.00 508.50 239.00 73.50 29.00 2.00 0.00 a 7.00 82.15 a 284.00 380.00 2482.15
1959 483.00 230.50 o 287.30 c 118.50 95.50 k 4.66 a 0.00 6.95 b 32.00 40.50 f 323.00 526.00 1781.41
1960 586.50 412.96 d 322.00 259.00 138.00 1.50 0.00 1.15 d 24.64 b 129.96 e 411.50 558.50 2845.71
1961 591.38 e 376.00 313.50 g 248.00 186.50 11.00 j 6.09 c 3.00 18.00 144.09 d 383.00 600.00 2556.07
1962 571.00 469.50 473.50 153.00 155.00 29.50 0.50 3.00 27.50 124.50 316.00 539.00 2862.00
1963 667.50 254.50 457.50 392.00 147.50 21.00 15.00 2.50 7.50 119.50 397.50 650.00 3132.00
1964 625.00 419.00 444.00 269.50 193.00 56.00 5.00 3.00 31.50 75.50 427.00 459.50 3008.00
1965 565.00 423.50 389.00 283.50 133.00 52.50 4.00 0.00 58.00 69.50 338.00 705.00 3021.00
1966 575.50 496.50 373.50 129.50 94.00 34.50 11.00 4.50 17.50 92.50 345.50 545.50 2720.00
1967 526.00 397.00 466.00 527.50 144.00 59.50 1.50 0.00 0.00 57.00 261.00 569.00 3008.50
1968 633.00 307.50 341.00 203.50 158.00 14.50 0.00 12.00 18.00 140.00 375.50 642.50 2845.50
1969 655.50 534.00 407.50 305.00 73.00 22.00 0.00 0.00 18.50 157.00 331.00 467.00 2970.50
1970 482.00 351.00 322.50 332.00 91.50 26.50 0.50 6.50 18.50 205.00 308.00 597.50 2741.50
1971 555.50 442.00 447.00 322.00 186.00 47.50 0.00 5.50 58.00 245.50 392.50 656.00 3357.50
1972 667.50 418.50 260.00 265.00 119.00 28.00 0.00 12.00 41.50 178.00 465.50 708.50 3163.50
1973 617.00 391.00 474.50 209.50 86.00 18.50 0.50 6.50 18.00 124.00 410.50 503.00 2859.00
1974 566.00 468.50 379.00 296.50 128.50 20.50 14.00 0.50 13.50 116.50 380.50 573.50 2957.50
1975 609.50 436.50 430.50 414.00 107.50 34.50 21.50 1.00 15.00 199.50 454.00 524.00 3247.50
1976 538.00 441.50 434.50 307.00 58.50 69.50 0.00 19.50 25.00 102.00 251.50 527.00 2774.00
1977 625.50 372.00 457.50 168.50 234.50 26.50 0.50 0.00 34.50 105.00 324.50 430.00 2779.00
1978 472.00 397.00 250.50 318.00 67.50 7.50 3.00 11.50 25.50 100.00 412.00 653.00 2717.50
1979 588.50 481.92 b 352.00 285.00 112.00 0.00 z 0.00 z 0.00 z 0.00 z 0.00 z 0.00 z 0.00 z 1819.42
1980 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 282.00 465.00 c 747.00
1981 0.00 z 372.00 378.72 a 189.00 52.50 0.00 z 3.00 0.00 5.50 180.00 268.00 446.29 b 1895.01
1982 651.00 364.50 466.00 268.50 61.00 39.00 4.50 0.00 z 32.50 117.50 448.50 539.00 2992.00
1983 564.00 345.00 373.00 296.50 106.00 4.50 11.50 7.00 12.50 55.50 418.00 447.50 2641.00
1984 404.60 b 441.50 250.00 258.00 49.00 15.00 3.50 1.50 0.00 z 188.00 0.00 z 0.00 z 1611.10
1985 642.50 336.00 443.00 121.00 0.00 z 0.00 z 0.00 7.00 57.00 144.50 454.00 669.50 2874.50
1986 0.00 z 303.50 0.00 z 206.00 0.00 z 10.00 2.50 0.00 109.50 99.00 272.00 558.00 1560.50
1987 0.00 z 396.00 382.00 92.50 73.37 a 0.00 z 0.00 z 0.00 z 8.00 0.00 z 0.00 z 0.00 z 951.87
1988 0.00 z 0.00 z 0.00 z 203.50 128.50 62.00 0.00 z 1.50 20.50 105.50 374.50 517.00 1413.00
1989 589.00 542.00 375.00 146.00 101.50 22.50 0.00 0.00 49.00 163.50 322.00 593.00 2903.50
1990 573.50 515.00 336.00 111.50 0.00 z 6.50 0.00 2.00 0.50 53.00 336.00 682.50 2616.50
1991 536.50 296.50 478.50 252.50 137.00 32.50 0.00 z 5.50 8.28 a 108.00 268.00 553.00 2676.28
1992 631.50 324.50 317.00 120.50 9.50 18.00 0.00 0.00 z 4.50 60.50 299.50 654.00 2439.50
1993 590.00 456.00 246.50 227.59 a 94.50 30.50 0.00 3.00 15.00 68.00 362.00 595.50 2688.59
1994 496.50 491.50 281.50 180.50 95.00 21.50 3.50 0.00 9.00 128.00 519.50 630.00 2856.50
1995 445.50 294.00 384.50 224.50 139.50 45.50 0.00 0.00 0.00 64.50 200.00 436.50 2234.50
1996 516.50 357.00 301.50 200.50 95.50 14.00 0.00 2.50 9.50 137.50 270.50 441.00 2346.00
1997 478.50 334.50 244.50 135.50 31.00 0.00 0.00 0.00 3.00 102.00 304.50 511.50 2145.00
1998 490.50 454.50 329.00 278.50 0.00 z 33.00 0.00 z 0.50 32.50 134.50 412.50 594.50 2760.00
1999 554.00 470.50 457.50 268.97 a 139.50 45.50 1.50 3.10 a 7.50 91.40 b 277.50 0.00 z 2316.96
2000 454.67 a 371.00 284.68 a 152.22 c 104.22 b 12.00 2.58 a 3.00 13.97 a 132.00 432.50 448.00 2410.85
2001 534.00 431.50 232.50 273.10 a 12.92 a 6.21 a 2.50 0.50 4.14 a 55.00 267.50 478.50 2298.36
2002 539.00 327.00 334.00 197.00 112.00 4.50 0.00 2.50 25.00 116.00 254.50 469.00 2380.50
2003 349.00 368.00 254.00 345.00 109.00 5.00 0.00 0.00 0.50 38.23 a 428.00 493.00 2389.73
2004 503.50 289.50 h 135.50 163.50 59.50 9.50 g 0.00 0.00 16.80 e 165.50 349.50 505.50 1899.30
2005 0.00 z 335.00 269.00 237.50 99.50 33.50 0.00 1.50 21.50 96.50 266.50 447.00 1807.50
2006 464.50 336.00 500.50 269.00 62.00 0.00 z 0.00 z 0.00 z 0.00 z 0.00 z 0.00 z 0.00 z 1632.00
Period of Record Statistics
MEAN 572.11 420.66 374.82 246.18 116.80 30.50 3.12 4.19 24.87 133.09 352.67 549.36 2854.99
S.D. 87.96 71.61 86.28 80.31 52.66 20.19 4.57 5.00 18.73 46.39 69.17 81.03 308.25
SKEW 0.43 -0.04 -0.29 0.58 0.94 0.48 1.90 2.01 1.65 0.13 -0.03 0.30 -0.36
MAX 842.50 565.00 545.00 527.50 317.75 77.50 21.50 23.50 109.50 245.50 519.50 738.46 3459.50
MIN 349.00 254.50 135.50 92.50 9.50 0.00 0.00 0.00 0.00 38.23 200.00 380.00 2145.00
NO YRS 69 71 72 75 70 68 65 70 72 71 72 70 51