SILVERTON, OREGON

Monthly Total Heating Degree Days

(357823)

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
1962 0.00 z 0.00 z 0.00 z 0.00 z 0.00 z 0.00 z 0.00 z 6.50 z 97.00 376.00 531.00 473.00 k 1004.00
1963 952.50 458.50 614.00 529.00 299.00 186.00 103.00 34.50 62.50 314.00 550.50 774.00 4877.50
1964 711.00 698.00 663.50 530.50 399.00 199.50 82.00 89.00 182.50 338.50 683.50 813.50 5390.50
1965 783.00 626.00 558.50 416.50 388.00 194.50 50.00 37.50 174.50 299.00 533.00 856.00 4916.50
1966 801.50 664.50 643.50 409.00 298.50 154.50 70.00 32.00 109.50 388.00 540.50 628.00 4739.50
1967 651.50 608.00 657.50 577.00 307.00 91.50 15.00 2.50 38.00 352.00 568.50 745.00 4613.50
1968 779.50 495.00 536.00 528.00 331.00 161.00 44.00 76.50 164.00 423.00 566.00 848.00 4952.00
1969 970.50 689.50 582.00 481.50 237.00 86.00 54.50 68.00 125.00 448.00 585.50 709.00 5036.50
1970 769.00 536.00 580.50 551.50 329.50 123.50 42.00 45.50 211.50 420.00 576.50 787.00 4972.50
1971 808.50 676.00 700.50 516.00 313.50 245.50 75.00 20.50 193.50 468.50 640.50 817.50 5475.50
1972 842.50 650.00 537.50 566.50 271.50 138.50 30.50 36.00 201.00 412.50 564.50 902.50 5153.50
1973 837.00 586.00 582.00 439.50 261.43 a 153.00 50.50 95.00 118.00 407.50 649.00 667.50 4846.43
1974 891.00 673.00 592.50 479.00 370.50 132.50 69.50 43.50 46.50 327.00 561.00 696.50 4882.50
1975 723.50 670.00 661.50 574.00 294.50 178.50 44.00 93.00 76.00 379.00 617.00 702.00 5013.00
1976 739.50 693.00 688.50 518.50 315.00 222.50 63.00 77.50 92.00 361.00 544.00 837.00 5151.50
1977 866.50 585.00 667.00 408.00 409.00 123.00 70.50 34.50 160.00 353.50 618.50 695.00 4990.50
1978 725.00 549.50 475.00 461.00 347.50 95.50 54.50 55.00 162.50 305.50 750.00 919.00 4900.00
1979 1072.00 649.00 499.00 437.00 259.50 116.50 41.50 29.50 63.50 266.50 672.00 650.50 4756.50
1980 898.50 618.50 614.00 394.50 304.50 211.00 37.50 75.50 119.50 340.00 539.50 695.00 4848.00
1981 738.00 621.00 523.00 420.00 299.50 188.50 62.00 26.50 118.00 394.50 536.50 699.00 4626.50
1982 825.50 653.50 615.00 562.00 309.00 130.50 61.50 45.50 135.50 336.50 660.50 731.50 5066.50
1983 718.00 523.00 496.00 445.00 250.50 170.50 94.50 16.00 164.00 392.00 519.50 901.50 4690.50
1984 705.00 571.00 503.50 516.00 356.50 215.00 54.00 31.50 140.50 447.50 601.50 877.50 5019.50
1985 960.00 0.00 z 641.00 392.00 285.50 138.00 10.50 63.00 179.00 375.00 823.00 981.00 4848.00
1986 658.50 584.00 419.00 470.50 309.00 75.00 78.50 8.50 211.50 316.50 549.50 800.50 4481.00
1987 785.50 0.00 z 525.50 338.00 234.00 108.00 57.00 28.50 90.00 234.50 510.50 817.50 3729.00
1988 805.00 633.00 566.50 404.00 320.50 163.00 54.00 48.50 124.00 246.00 525.50 791.53 a 4681.53
1989 721.00 813.50 591.00 301.00 279.50 101.00 62.00 46.50 78.00 368.00 540.50 819.00 4721.00
1990 692.00 690.00 0.00 z 343.00 299.00 127.50 22.50 21.00 41.00 399.00 516.00 958.00 4109.00
1991 791.00 460.50 617.50 457.50 360.50 218.50 32.00 25.50 77.00 314.50 544.00 764.00 4662.50
1992 665.50 518.00 419.50 341.50 133.50 65.00 18.00 27.50 136.00 285.00 585.50 803.50 3998.50
1993 910.50 719.50 507.50 421.50 191.00 148.50 89.00 47.50 89.00 265.00 777.50 819.50 4986.00
1994 696.00 673.50 487.00 387.00 230.00 158.50 28.50 11.50 58.00 401.50 734.00 726.00 4591.50
1995 663.00 509.50 554.50 469.00 222.00 145.50 22.50 64.50 50.50 373.50 426.00 728.50 4229.00
1996 724.50 698.50 547.00 381.50 365.00 149.50 35.00 43.00 168.50 388.00 584.50 728.50 4813.50
1997 754.50 629.50 571.50 469.00 154.00 135.50 37.50 9.00 94.00 416.00 492.00 797.00 4559.50
1998 662.00 545.50 544.00 433.50 330.00 133.00 25.00 30.50 86.00 382.00 526.50 803.93 a 4501.93
1999 730.50 617.00 638.50 480.00 378.00 201.50 72.00 32.00 107.50 344.50 483.50 720.23 a 4805.23
2000 803.93 a 632.50 641.00 397.00 300.00 121.50 55.50 62.50 129.50 370.50 729.50 770.50 5013.93
2001 772.00 648.50 561.00 496.00 262.00 192.93 a 46.50 32.03 a 101.50 384.92 a 511.00 755.50 4763.88
2002 750.00 604.50 671.50 434.50 350.50 120.50 30.00 33.50 92.50 376.00 535.50 677.00 4676.00
2003 627.00 596.00 509.50 485.00 309.50 106.50 13.00 12.00 87.00 253.50 676.00 734.50 4409.50
2004 811.50 607.50 483.50 353.50 234.00 107.50 15.00 19.50 133.50 318.00 638.50 715.00 4437.00
2005 740.00 654.50 490.00 418.50 232.00 179.50 16.00 16.50 145.00 328.00 672.00 815.00 4707.00
2006 647.50 672.50 637.50 411.00 0.00 z 100.50 28.00 42.00 97.50 399.00 565.00 803.50 4404.00
2007 864.00 598.50 506.50 462.50 290.50 156.00 10.50 23.00 148.00 434.50 663.50 780.00 4937.50
2008 895.50 649.00 676.50 570.00 311.00 227.00 33.00 44.00 125.50 399.50 527.50 862.50 5321.00
2009 820.00 675.50 669.50 472.00 277.50 88.50 27.00 36.50 78.00 395.00 555.50 907.00 5002.00
2010 608.00 539.50 567.50 484.00 374.00 193.00 68.00 58.00 107.50 338.50 606.50 682.00 4626.50
2011 756.00 706.00 611.50 566.50 411.00 185.50 73.00 22.00 77.00 361.00 651.50 867.50 5288.50
2012 763.50 652.00 687.50 406.00 320.50 196.50 47.50 19.50 88.50 328.00 534.50 729.50 4773.50
2013 922.00 618.00 562.50 3.00 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 2102.50
Period of Record Statistics
MEAN 780.58 621.23 577.92 456.11 300.31 151.22 47.52 39.86 116.78 359.71 590.08 782.21 4824.05
S.D. 98.38 70.59 71.90 69.15 60.70 44.27 23.31 22.60 45.31 53.98 80.92 81.13 288.68
SKEW 0.65 -0.27 -0.19 0.00 -0.46 0.11 0.28 0.75 0.33 -0.40 0.85 0.38 -0.21
MAX 1072.00 813.50 700.50 577.00 411.00 245.50 103.00 95.00 211.50 468.50 823.00 981.00 5475.50
MIN 608.00 458.50 419.00 301.00 133.50 65.00 10.50 2.50 38.00 234.50 426.00 628.00 3998.50
NO YRS 51 49 50 50 49 50 50 50 51 51 51 50 46