HILLSBORO, OREGON

Monthly Total Heating Degree Days

(353908)

Base Temperature = 65 F

File last updated on Apr 4, 2013
*** Note *** Provisional Data *** After Year/Month 200305
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
1929 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 586.50 f 687.00 687.00
1930 1230.91 b 588.00 a 531.50 360.50 385.50 216.50 95.58 a 68.41 b 174.50 466.55 a 638.89 c 651.50 f 4756.85
1931 698.61 c 662.85 b 564.72 a 364.50 175.50 140.69 a 17.57 a 51.50 205.00 418.50 721.00 826.00 4846.43
1932 863.00 723.00 588.00 425.00 304.50 109.00 83.50 52.00 80.00 c 196.00 k 565.18 b 907.61 d 4700.79
1933 804.50 452.00 k 633.00 431.00 403.57 d 158.00 38.00 50.50 254.50 281.00 f 506.00 g 622.58 a 3395.66
1934 213.50 t 561.12 c 383.76 b 195.60 e 293.43 b 184.14 a 38.50 26.50 185.00 334.50 528.00 743.50 3474.05
1935 847.50 626.37 a 736.00 451.50 336.00 203.50 90.50 49.50 123.50 514.00 756.00 832.50 5566.87
1936 734.18 a 908.00 683.03 a 361.07 b 187.00 73.50 15.00 23.00 157.00 344.62 a 748.00 743.00 4977.40
1937 1138.50 687.04 a 545.00 475.50 215.00 79.66 a 31.50 70.61 d 132.50 317.46 d 522.50 707.50 4922.77
1938 807.50 664.00 620.00 399.00 227.00 80.17 a 30.00 81.78 b 68.28 a 376.00 708.89 c 784.30 a 4846.91
1939 730.50 745.36 c 572.50 385.00 250.00 180.50 68.00 52.50 124.00 378.20 a 617.78 c 656.68 a 4761.02
1940 775.50 564.50 465.00 a 376.50 159.00 100.86 a 30.00 27.00 85.00 294.50 656.38 a 731.50 4265.74
1941 728.50 563.50 434.50 370.50 289.50 131.38 a 14.50 49.50 221.00 362.00 599.50 747.50 4511.88
1942 958.50 662.00 659.50 429.50 322.50 206.50 40.00 68.50 131.00 366.50 660.00 722.50 5227.00
1943 1015.00 627.41 a 650.50 341.50 340.50 169.00 43.50 70.00 57.50 353.50 640.50 829.00 5137.91
1944 832.00 690.20 d 633.50 445.00 284.00 161.50 58.50 64.67 b 113.00 259.50 650.50 859.50 5051.87
1945 745.50 597.50 644.50 465.00 222.50 165.00 46.50 50.00 199.50 405.00 618.00 778.50 4937.50
1946 800.00 666.50 580.00 439.50 186.50 180.00 52.00 64.50 137.00 455.50 675.00 735.00 4971.50
1947 914.50 564.50 480.00 316.50 192.00 150.50 62.00 84.50 113.00 339.50 591.00 749.00 4557.00
1948 0.00 z 0.00 z 0.00 z 0.00 z 0.00 z 0.00 z 55.80 a 62.00 166.00 415.40 a 671.25 b 897.45 a 2267.90
1949 1160.95 a 737.50 598.00 365.17 a 194.00 106.03 a 48.00 26.50 g 64.66 a 524.50 488.00 762.00 5048.81
1950 1125.82 a 708.50 645.12 b 497.50 320.85 a 111.50 30.48 a 27.50 103.00 432.00 602.00 577.63 a 5181.90
1951 819.90 b 627.00 743.00 340.50 241.00 78.00 15.50 45.50 86.00 353.92 a 599.48 a 853.50 4803.30
1952 901.00 702.50 641.50 363.00 245.00 149.44 c 12.40 a 33.07 a 76.61 b 192.72 a 772.50 b 752.78 a 4842.52
1953 555.93 a 600.00 608.24 b 474.50 322.50 217.00 37.00 42.22 b 89.00 322.50 509.50 703.91 b 4482.31
1954 833.50 612.37 a 647.56 d 469.82 b 237.00 218.79 a 80.08 a 76.98 a 157.00 393.38 b 488.00 765.00 4979.49
1955 829.00 698.50 739.50 575.50 376.00 168.50 106.50 68.50 153.50 365.00 716.00 806.00 5602.50
1956 762.50 850.50 648.00 351.00 206.50 215.00 36.50 47.00 110.50 417.97 b 669.00 769.00 5083.47
1957 1064.00 637.00 545.00 377.50 183.50 107.50 39.50 45.98 a 34.00 365.28 a 641.00 676.50 4716.77
1958 670.50 450.00 599.50 419.00 134.00 64.50 0.50 2.00 120.00 271.00 589.00 635.00 3955.00
1959 741.00 643.00 588.00 411.50 331.00 150.00 54.00 76.50 189.50 351.00 636.00 816.50 4988.00
1960 972.50 700.50 645.50 457.50 373.00 84.00 30.50 56.50 99.00 298.50 580.50 797.50 5095.50
1961 645.00 518.00 551.50 446.00 281.00 75.50 22.00 1.00 165.50 383.00 679.00 738.00 4505.50
1962 832.00 636.50 649.00 390.50 400.00 151.00 78.50 40.50 121.00 380.50 554.50 745.00 4979.00
1963 974.50 498.00 633.50 521.50 285.50 179.50 102.00 57.00 57.50 372.50 455.00 g 763.50 4445.00
1964 725.50 677.50 654.00 546.00 413.50 195.00 87.00 127.00 233.50 388.02 a 719.50 808.50 5575.02
1965 770.00 623.50 578.00 444.00 399.00 199.50 52.50 54.00 204.50 324.00 530.00 851.50 5030.50
1966 782.50 661.50 621.00 424.50 309.50 186.50 70.00 70.00 127.50 434.50 524.00 664.50 4876.00
1967 679.50 611.00 675.28 a 586.50 322.00 93.50 10.00 1.50 42.93 a 344.10 a 531.00 734.50 4631.81
1968 764.00 482.50 515.50 507.00 297.50 137.50 44.00 76.00 143.00 429.00 573.50 829.50 4799.00
1969 969.00 680.50 571.00 453.00 210.28 a 51.50 54.00 88.00 139.50 423.50 581.50 715.00 4936.78
1970 744.00 517.50 558.50 532.50 296.00 107.00 44.00 37.00 210.00 412.50 584.50 784.00 4827.50
1971 774.00 630.00 658.00 458.00 266.00 223.00 52.50 14.50 167.00 446.50 606.50 800.50 5096.50
1972 831.50 646.50 509.00 539.50 199.00 101.00 27.50 28.00 205.50 412.00 560.50 923.00 4983.00
1973 823.00 563.00 594.50 443.50 262.50 160.50 34.00 108.00 127.76 a 400.00 654.00 652.50 4823.26
1974 843.00 645.50 566.50 441.50 344.00 98.50 62.00 46.50 61.00 368.00 562.50 676.50 4715.50
1975 734.00 670.00 620.00 553.50 278.50 172.00 46.00 92.00 85.50 397.00 622.00 692.00 4962.50
1976 725.50 686.50 668.50 473.50 291.00 208.00 59.50 65.50 86.50 359.50 559.00 816.50 4999.50
1977 696.50 f 581.00 656.00 393.00 388.00 103.00 77.50 43.50 146.90 a 369.33 b 649.50 680.00 4087.72
1978 718.00 527.50 474.00 441.50 330.15 a 79.66 a 37.50 45.50 167.00 327.00 777.00 926.00 4850.81
1979 1061.50 649.50 503.50 428.00 252.00 113.00 49.60 a 33.00 83.28 a 298.50 635.00 648.00 4754.88
1980 905.00 654.50 604.50 384.50 299.00 219.50 43.00 98.50 154.50 368.00 543.00 684.50 4958.50
1981 689.50 619.50 545.00 442.00 303.00 175.50 71.00 36.50 129.50 408.00 537.50 695.50 4652.50
1982 851.00 650.50 625.00 548.50 310.50 122.50 67.50 61.50 155.00 393.00 670.34 a 764.50 5219.84
1983 701.50 530.50 490.50 420.00 238.00 163.50 77.50 33.00 182.00 431.00 509.50 930.50 4707.50
1984 737.00 620.00 499.50 496.50 373.00 184.00 53.00 50.00 169.50 471.50 612.50 895.00 5161.50
1985 928.50 726.00 670.00 397.50 296.50 142.00 10.50 63.50 218.00 439.50 856.50 968.00 5716.50
1986 697.50 610.00 439.50 470.50 325.00 86.50 89.50 2.00 206.50 324.00 564.50 792.50 4608.00
1987 777.00 573.50 538.50 366.00 226.00 108.00 62.50 32.50 106.50 279.00 533.50 844.00 4447.00
1988 826.50 627.12 a 581.00 410.50 335.50 148.50 36.00 71.50 162.50 255.00 564.00 780.50 4798.62
1989 747.00 847.00 629.50 317.00 270.00 104.00 76.00 63.50 79.00 383.50 553.50 799.50 4869.50
1990 707.50 691.00 521.50 351.50 320.50 129.50 28.50 33.00 54.00 432.50 593.50 990.50 4853.50
1991 824.00 483.00 642.50 453.50 366.50 199.00 39.00 32.50 81.00 351.50 565.00 748.00 4785.50
1992 700.50 493.00 425.00 332.50 178.00 82.00 20.50 32.50 160.50 315.00 594.00 824.00 4157.50
1993 911.50 711.50 520.50 418.50 174.50 147.50 101.50 46.00 102.50 287.50 788.50 780.50 4990.50
1994 682.50 703.00 483.00 381.00 218.50 153.50 28.50 15.00 60.50 437.00 746.50 721.50 4630.50
1995 663.50 535.11 a 558.00 465.50 190.50 129.00 14.50 62.50 51.50 389.00 450.50 722.00 4231.61
1996 740.50 697.50 545.00 375.50 330.50 113.00 24.50 35.00 163.50 391.50 627.00 741.50 4785.00
1997 750.00 617.00 569.50 432.50 136.00 98.50 14.00 4.50 75.00 368.50 364.00 730.50 4160.00
1998 657.50 512.00 455.00 337.50 238.50 34.50 2.00 11.00 34.00 305.00 444.50 751.00 3782.50
1999 693.00 552.50 571.50 405.00 315.88 b 148.00 31.50 q 0.00 z 0.00 z 171.50 s 444.50 544.00 3674.38
2000 768.50 601.50 502.50 199.00 0.00 z 0.00 z 0.00 z 0.00 z 0.00 z 0.00 z 0.00 z 0.00 z 2071.50
2001 0.00 z 0.00 z 0.00 z 0.00 z 178.50 212.59 a 59.00 55.00 151.50 488.00 456.50 f 475.50 m 1144.59
2002 811.50 644.00 717.00 419.00 313.50 113.33 c 11.00 k 16.50 p 49.50 o 388.00 565.00 689.00 4660.33
2003 625.50 582.50 518.50 446.00 267.50 0.00 z 0.00 z 0.00 z 0.00 z 0.00 z 0.00 z 0.00 z 2440.00
Period of Record Statistics
MEAN 812.20 631.79 582.83 422.62 277.35 140.99 47.58 50.10 129.75 374.85 607.11 765.10 4838.95
S.D. 134.17 84.84 78.20 73.06 70.31 47.90 25.84 25.63 53.45 61.80 90.32 87.34 362.32
SKEW 1.10 0.50 -0.23 -0.36 -0.07 -0.01 0.36 0.25 0.16 -0.17 0.21 0.25 -0.33
MAX 1230.91 908.00 743.00 586.50 413.50 223.00 106.50 127.00 254.50 524.50 856.50 990.50 5716.50
MIN 555.93 450.00 383.76 195.60 134.00 34.50 0.50 1.00 34.00 192.72 364.00 544.00 3782.50
NO YRS 70 71 72 72 72 71 70 69 70 69 69 71 61