HETCH HETCHY, CALIFORNIA

Monthly Total Heating Degree Days

(043939)

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 630.00 f 607.00 518.50 320.50 102.50 82.50 0.00 0.00 119.00 295.00 695.00 982.50 3722.50
1932 986.00 767.50 538.00 504.00 318.00 103.00 19.50 11.50 11.50 245.50 385.00 985.00 4874.50
1933 1012.50 836.00 672.50 475.50 518.50 128.50 0.50 1.00 47.00 108.00 428.50 729.50 4958.00
1934 680.50 570.50 275.50 227.00 183.50 150.50 0.50 0.00 92.50 259.00 545.50 744.00 3729.00
1935 962.00 660.50 821.50 483.00 270.00 34.00 27.00 0.00 3.50 349.50 675.00 738.50 5024.50
1936 780.00 795.00 500.50 386.00 205.50 140.00 18.00 0.00 69.00 229.00 461.00 777.50 4361.50
1937 1248.50 811.50 682.50 494.00 172.00 116.50 0.00 1.50 46.00 213.79 b 607.20 e 726.50 5119.99
1938 733.00 793.00 800.00 470.00 267.00 64.00 10.50 0.00 32.00 354.50 621.50 661.50 4807.00
1939 742.00 821.50 623.50 271.00 261.00 107.00 5.00 0.00 80.50 347.50 462.50 650.00 4371.50
1940 726.00 702.50 541.50 418.00 140.00 33.50 10.00 0.00 121.00 251.00 594.50 676.50 4214.50
1941 775.50 608.00 576.00 561.00 250.00 169.00 12.00 22.50 147.00 389.50 496.00 826.50 4833.00
1942 864.00 757.50 636.50 536.00 426.50 104.50 0.00 17.50 38.00 220.00 531.50 723.50 4855.50
1943 726.50 598.00 602.50 394.50 223.50 215.00 6.50 9.50 9.00 275.50 506.00 741.50 4308.00
1944 828.50 796.46 a 643.50 579.00 243.00 243.50 2.50 5.00 53.00 196.50 673.50 737.00 5001.46
1945 793.50 652.00 820.50 424.00 338.00 118.00 0.00 8.00 72.50 222.00 657.50 827.00 4933.00
1946 750.50 755.50 665.50 386.00 265.00 90.50 0.00 0.00 43.00 401.00 678.00 683.00 4718.00
1947 799.00 543.00 531.50 396.00 150.50 109.00 5.00 37.00 46.00 301.50 682.00 813.00 4413.50
1948 682.50 829.50 826.00 598.00 417.50 145.50 31.50 7.00 118.00 266.00 574.50 965.50 5461.50
1949 1128.00 899.50 773.00 300.50 289.50 62.50 0.52 a 10.00 45.50 283.50 327.50 855.50 4975.52
1950 1072.00 596.00 659.02 b 370.50 115.50 g 124.50 0.00 8.50 101.50 229.00 453.50 623.00 4237.52
1951 845.00 696.00 651.00 399.00 306.79 b 64.00 9.00 12.50 19.00 321.50 562.00 906.50 4792.29
1952 1027.00 768.50 865.50 398.50 188.50 193.00 6.50 0.00 71.50 131.50 599.00 888.00 5137.50
1953 726.50 589.56 a 668.50 482.00 490.00 207.00 3.50 31.50 37.50 303.50 547.00 719.00 4805.56
1954 838.00 527.00 744.00 303.50 177.00 183.50 1.50 g 34.50 69.00 219.50 465.00 836.50 4397.50
1955 994.00 734.00 644.00 618.75 b 315.00 119.00 46.00 0.00 81.50 179.00 607.50 808.50 5147.25
1956 625.50 g 788.50 584.50 502.50 321.07 c 100.50 14.00 15.50 45.50 271.00 i 511.00 748.50 3631.57
1957 1013.70 a 621.00 515.50 h 448.93 b 404.66 c 58.45 a 1.15 d 27.00 67.50 411.50 628.93 b 544.50 i 3682.81
1958 771.00 625.00 797.50 477.50 171.69 e 147.41 a 17.50 0.00 59.42 d 129.00 547.00 572.00 4315.03
1959 738.50 742.00 483.00 262.00 343.00 42.50 0.00 28.00 149.00 181.50 426.50 681.00 4077.00
1960 941.00 757.00 513.50 444.00 305.35 a 6.72 a 0.00 a 16.50 10.86 a 271.77 a 659.44 c 779.13 a 4705.28
1961 690.27 a 612.77 b 687.50 408.50 361.67 a 79.00 10.00 3.50 100.34 a 274.35 a 609.11 b 853.57 b 4690.57
1962 852.50 e 764.17 d 835.85 d 308.65 d 416.43 a 86.90 a 6.41 b 13.50 38.57 b 261.90 b 508.93 b 692.33 a 4786.15
1963 829.77 a 471.52 c 716.00 700.00 265.05 a 181.50 21.38 b 28.50 56.90 a 270.50 647.22 c 731.08 a 4919.42
1964 842.17 a 660.00 726.00 525.52 a 413.33 a 163.45 a 12.00 1.50 86.90 a 145.70 a 708.46 d 786.88 a 5071.91
1965 853.00 564.85 b 644.59 b 512.78 c 329.00 176.50 15.00 15.50 169.14 a 173.17 b 572.07 a 851.93 d 4877.52
1966 846.96 c 779.69 b 562.81 b 312.00 0.00 z 125.19 d 28.50 10.00 68.00 222.17 a 512.22 c 754.33 a 4221.88
1967 777.07 a 565.38 b 714.50 840.50 297.50 187.00 0.00 0.00 31.11 c 223.72 a 435.00 c 988.26 b 5060.04
1968 835.45 a 586.98 b 598.00 423.50 315.00 84.50 0.00 a 91.00 70.00 285.50 631.03 a 972.76 b 4893.72
1969 854.57 a 858.87 e 493.50 i 454.29 b 171.50 137.50 2.50 0.00 35.56 c 407.50 522.22 c 756.00 4200.50
1970 770.35 a 575.62 b 595.00 610.50 204.00 129.00 1.50 0.00 80.17 a 306.38 a 531.11 c 928.34 c 4731.97
1971 822.61 c 628.38 b 632.40 a 545.69 a 412.50 124.50 1.50 2.00 102.00 435.55 a 612.41 a 1024.66 c 5344.21
1972 887.12 a 602.87 c 415.50 487.50 224.00 58.00 4.50 17.00 117.50 369.93 a 682.78 c 965.43 c 4832.12
1973 0.00 z 686.00 b 789.93 d 413.00 175.00 72.00 4.50 32.03 a 67.24 a 311.72 d 712.50 b 762.37 d 4026.29
1974 829.77 a 658.00 b 621.00 524.00 243.00 35.00 27.00 2.00 4.50 250.50 601.15 d 790.50 c 4586.42
1975 755.88 a 739.85 b 734.70 a 718.00 262.50 0.00 z 16.50 f 20.00 4.66 a 404.72 d 639.64 b 765.18 a 5045.13
1976 555.50 g 698.15 b 701.50 568.50 174.00 121.00 8.27 a 103.00 101.25 b 257.30 a 416.54 d 719.20 a 3868.70
1977 837.52 a 523.70 a 764.50 326.50 531.50 52.50 4.13 a 10.00 131.79 b 190.13 a 519.31 a 675.59 b 4567.17
1978 755.00 661.23 b 521.50 592.00 258.50 103.00 22.73 a 32.00 122.50 f 0.00 z 690.54 b 0.00 z 3636.50
1979 0.00 z 795.31 b 649.00 483.00 220.62 a 58.50 27.90 a 32.00 21.96 b 270.22 a 615.56 c 724.88 a 3898.94
1980 741.42 a 612.35 c 706.00 446.50 394.73 a 182.00 26.50 13.43 a 66.43 b 273.32 a 460.71 b 659.02 b 4582.41
1981 675.80 a 618.15 b 692.00 376.50 268.31 b 33.00 0.00 0.00 37.76 a 413.85 a 534.11 b 720.75 a 4370.23
1982 968.00 604.00 756.00 523.00 242.50 139.00 46.50 4.50 159.50 375.00 700.18 b 843.50 5361.68
1983 755.50 667.85 a 714.00 627.00 309.50 95.00 71.30 a 28.50 64.50 275.50 675.50 801.50 5085.65
1984 685.00 669.00 525.00 534.50 171.00 121.50 0.00 0.00 27.00 456.50 717.00 865.50 4772.00
1985 816.50 668.50 762.50 303.00 261.00 70.50 4.00 14.00 201.00 318.00 727.50 773.50 4920.00
1986 633.00 636.00 487.00 474.00 291.50 34.00 9.00 0.00 253.50 261.50 469.50 742.50 4291.50
1987 850.50 644.00 663.00 258.50 238.00 27.00 32.00 4.50 24.00 148.50 600.00 885.50 4375.50
1988 832.00 515.50 531.00 422.00 326.00 129.50 0.00 0.00 41.00 74.00 587.00 847.00 4305.00
1989 958.00 767.00 572.00 279.50 307.50 48.00 3.50 11.00 84.50 345.50 527.14 b 719.50 4623.14
1990 872.50 837.00 551.50 345.50 298.50 103.00 0.00 27.00 66.50 161.00 557.50 986.50 4806.50
1991 792.50 456.00 849.50 518.50 420.00 123.00 2.50 6.50 16.50 185.00 513.10 a 759.00 4642.10
1992 802.50 629.00 584.50 284.00 77.50 78.50 15.00 6.00 17.50 185.50 573.00 933.50 4186.50
1993 891.50 641.50 450.00 406.50 211.00 162.00 13.50 14.00 62.00 246.50 547.50 829.50 4475.50
1994 725.00 740.50 507.50 407.00 276.50 59.50 0.00 0.00 53.00 336.50 850.00 0.00 z 3955.50
1995 839.00 448.50 658.00 486.21 a 383.50 175.00 13.50 6.00 35.50 153.50 355.00 725.50 4279.21
1996 759.50 632.00 588.50 369.50 250.00 73.00 0.00 0.00 65.00 312.50 543.00 743.00 4336.00
1997 800.00 591.50 394.00 405.00 106.50 61.00 0.00 z 0.00 17.00 285.00 527.50 844.00 4031.50
1998 807.00 780.50 624.00 580.00 527.50 182.50 4.00 19.00 149.50 380.50 658.50 889.00 5602.00
1999 739.50 742.50 703.00 562.00 285.00 126.50 f 17.50 82.00 18.00 113.50 464.00 706.00 4433.00
2000 668.50 648.88 a 537.50 301.00 171.00 42.00 6.00 1.50 91.50 315.00 658.00 649.00 4089.88
2001 790.00 736.96 c 477.00 509.50 41.50 19.00 0.00 0.00 a 7.50 120.00 499.00 878.50 4078.96
2002 795.00 566.50 626.50 361.50 254.50 18.50 0.00 0.00 39.00 245.50 421.00 773.50 4101.50
2003 566.50 596.50 526.00 613.50 263.00 23.00 0.00 2.00 7.50 58.00 657.00 795.00 4108.00
2004 772.50 746.00 310.50 324.00 185.00 35.00 0.00 0.00 53.50 340.00 655.00 786.00 4207.50
2005 878.00 648.00 603.00 524.50 306.50 151.00 0.00 2.50 133.00 283.50 504.00 733.00 4767.00
2006 852.00 563.00 811.00 512.50 143.50 0.00 z 0.00 z 0.00 z 0.00 z 0.00 z 0.00 z 0.00 z 2882.00
Period of Record Statistics
MEAN 823.84 672.23 632.17 453.17 275.01 104.44 9.85 12.81 67.37 264.52 570.12 792.20 4677.81
S.D. 115.94 100.94 124.07 117.99 103.08 55.22 13.33 19.58 49.29 89.49 99.56 100.00 390.72
SKEW 1.02 0.03 -0.35 0.44 0.41 0.27 2.13 2.81 1.22 -0.08 -0.05 0.45 -0.02
MAX 1248.50 899.50 865.50 840.50 531.50 243.50 71.30 103.00 253.50 456.50 850.00 1024.66 5602.00
MIN 566.50 448.50 275.50 227.00 41.50 6.72 0.00 0.00 3.50 58.00 327.50 572.00 3729.00
NO YRS 71 76 74 76 74 73 72 75 74 73 75 72 60