ST HELENS RFD, OREGON

Monthly Total Heating Degree Days

(357466)

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
1976 0.00 z 0.00 z 0.00 z 0.00 z 0.00 z 0.00 z 0.00 z 51.48 c 94.00 337.00 515.00 765.50 1762.98
1977 902.21 b 536.50 616.50 359.50 351.50 81.50 60.00 24.00 141.50 347.00 625.50 690.50 4736.21
1978 724.00 0.00 z 462.00 401.50 303.80 a 57.50 27.38 a 36.50 129.00 268.50 728.00 894.50 4032.68
1979 1037.00 678.50 464.50 405.50 191.00 98.50 19.50 11.50 0.00 z 0.00 z 605.00 641.00 4152.00
1980 929.50 644.21 a 605.69 e 383.04 b 332.14 c 161.50 g 10.00 k 53.45 b 86.79 b 236.50 g 542.00 562.50 f 3576.82
1981 508.00 g 431.00 h 489.11 d 381.21 a 276.93 a 147.69 d 53.50 g 4.00 h 102.93 a 387.50 c 396.50 g 554.50 g 1785.37
1982 816.50 615.50 610.50 505.00 235.00 86.50 59.50 35.00 110.00 318.50 657.00 747.58 e 4796.58
1983 518.00 h 533.50 458.50 388.00 205.50 130.50 52.00 5.50 150.00 387.00 529.44 c 917.08 a 3757.03
1984 731.50 588.50 454.50 465.50 310.00 148.00 21.50 15.00 94.00 422.00 592.50 864.00 4707.00
1985 882.00 692.00 592.00 337.50 245.42 a 81.00 0.00 24.50 149.00 393.50 850.80 e 968.50 5216.22
1986 664.00 557.00 370.00 422.00 277.50 45.00 52.50 2.50 0.00 z 257.50 559.00 754.00 3961.00
1987 812.00 526.50 476.00 309.50 177.50 64.00 34.50 12.00 62.50 195.50 491.50 799.00 3960.50
1988 793.50 581.50 532.00 354.00 281.14 b 107.50 22.50 12.00 109.00 180.50 544.50 736.00 4254.14
1989 707.00 808.50 628.00 299.00 224.00 76.00 33.00 33.00 46.50 294.00 487.00 735.50 4371.50
1990 681.50 663.00 453.50 289.00 275.50 81.00 8.50 5.50 3.50 371.50 556.50 955.00 4344.00
1991 795.00 468.50 578.50 391.50 289.50 134.50 7.50 17.50 24.50 274.00 500.69 a 720.50 4202.19
1992 656.00 272.00 m 360.00 258.33 c 91.00 48.00 11.50 10.50 105.54 b 231.50 568.00 793.50 3133.87
1993 862.83 a 670.00 495.00 386.50 111.00 103.50 59.50 19.00 46.50 243.50 747.00 778.50 4522.83
1994 436.00 j 733.00 444.00 311.00 144.00 87.00 22.00 0.00 23.50 370.50 719.50 716.00 3570.50
1995 674.50 497.50 519.50 408.50 132.50 100.50 1.50 15.50 21.00 336.00 451.00 744.52 a 3902.52
1996 760.00 678.50 503.00 343.00 262.50 52.00 2.50 17.00 94.00 355.50 592.00 701.00 4361.00
1997 751.00 552.50 561.00 406.50 127.50 91.50 14.50 g 0.00 31.00 n 339.45 a 489.00 771.50 4089.95
1998 705.50 521.00 456.00 359.00 271.00 44.50 16.00 0.00 16.00 298.50 538.00 766.00 3991.50
1999 695.84 c 604.59 a 570.73 c 357.50 323.36 b 154.82 b 51.09 d 20.27 e 6.50 i 314.17 e 550.96 d 717.00 4360.34
2000 829.77 a 640.23 c 625.88 b 318.75 b 272.11 d 56.50 36.50 5.17 d 50.00 c 266.50 g 655.86 a 813.75 a 4304.52
2001 738.83 a 636.46 b 535.78 a 441.67 c 102.00 i 132.86 b 29.28 d 6.95 b 48.00 h 260.00 f 425.50 g 555.00 g 2521.83
2002 491.50 k 408.50 h 297.00 o 441.50 268.50 82.78 c 16.50 12.50 47.50 k 317.50 563.00 705.00 2407.28
2003 645.00 595.00 415.00 g 447.00 268.50 59.00 3.00 2.77 c 79.80 e 234.71 c 286.00 p 760.07 d 3094.86
2004 489.00 m 291.00 n 428.26 d 276.00 294.50 d 75.60 e 8.00 g 7.50 91.00 k 309.40 e 459.50 j 547.50 h 1391.26
2005 0.00 z 624.75 d 462.00 307.50 g 174.00 105.50 g 7.50 12.50 f 79.00 l 178.50 k 628.00 792.00 2688.25
2006 508.50 f 681.74 e 586.00 335.00 0.00 z 49.50 k 45.50 41.50 113.00 328.50 g 630.00 c 848.50 3281.24
2007 915.53 a 657.50 562.50 426.50 f 305.50 171.43 b 18.00 57.35 a 171.72 a 430.38 a 650.50 803.23 c 4743.65
2008 888.00 677.50 736.50 595.50 314.17 e 234.81 d 37.00 h 71.50 116.00 62.00 w 555.58 d 907.27 a 5096.82
2009 874.00 720.00 724.76 b 541.00 290.37 a 132.41 a 0.00 z 0.00 z 0.00 z 0.00 z 0.00 z 0.00 z 3282.54
2010 0.00 z 0.00 z 0.00 z 0.00 z 0.00 z 245.40 e 108.50 e 55.44 e 155.50 357.50 670.50 762.50 2355.34
2011 791.50 777.84 c 652.50 616.55 a 409.09 c 201.96 b 95.14 b 33.50 f 58.00 f 435.66 c 672.32 b 862.04 e 5514.60
2012 819.78 d 697.21 e 697.50 d 477.69 d 318.35 e 141.50 i 31.50 h 40.50 i 65.00 k 297.00 g 551.25 b 766.96 d 4328.74
2013 934.17 e 513.00 f 603.90 e 6.50 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 1538.08
Period of Record Statistics
MEAN 793.72 628.63 538.71 394.33 253.16 106.68 31.81 21.32 88.30 321.72 594.28 787.44 4412.78
S.D. 99.82 82.20 94.17 85.13 74.56 52.68 27.09 19.43 47.86 68.24 87.96 78.78 378.28
SKEW 0.40 0.06 0.22 0.84 -0.51 1.08 1.14 1.00 -0.16 -0.26 0.85 0.68 0.52
MAX 1037.00 808.50 736.50 616.55 409.09 245.40 108.50 71.50 171.72 435.66 850.80 968.50 5216.22
MIN 645.00 468.50 360.00 258.33 91.00 44.50 0.00 0.00 3.50 180.50 451.00 641.00 3902.52
NO YRS 29 30 34 33 33 32 29 32 26 28 32 32 13