ICE HARBOR DAM, WA

Monthly Sum of Heating Degree Days (Degrees Fahrenheit)

(453883)

Base Temperature = 65 F

File last updated on May 24, 2015
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.
MAXIMUM ALLOWABLE NUMBER OF MISSING DAYS : 5
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)JANFEBMARAPRMAYJUNJULAUGSEPOCTNOVDECANN
1957-----z-----z172.50u285.17c66.50 8.50 2.00 1.00 47.00 405.00b727.50 725.00 2267.67c
1958842.50 531.00 648.00 386.50 74.50 2.00 0.00 0.00 77.50 332.50 687.00 858.00a4439.50
1959945.50 763.50 553.50 342.00 245.50 24.00 4.50 11.00 110.50 356.50 828.00 983.50 5168.00
19601274.50 762.50 613.00 333.50 208.50 25.00 0.00 21.00 57.00 291.00 636.00 1053.00 5275.00
1961901.50 513.00b532.50 344.38b164.50 14.00 0.50 0.00 112.50a400.50 881.00 912.50 4776.88
19621009.50a755.00 668.00a250.00a230.00 47.00 8.00 5.00 59.50 320.00a571.00a816.50 4739.50
19631151.00 748.00 565.50 410.00 165.50 34.50 0.50 1.50 30.00 229.00 573.00 997.50 4906.00
1964795.50 702.15c651.00 407.00 196.00 37.00 0.00 17.50 77.00 368.00 712.50 1045.00 5008.65
1965903.00 641.00 694.00 269.50 168.00a32.50 4.00a16.00 106.00 221.50 561.00 907.00 4523.50
1966858.50 708.00 562.50 321.50 128.00 54.00 12.50 2.50 20.50 310.50 563.50a750.00 4292.00
1967670.50 576.00 594.00 459.50 169.00 17.50 0.00 0.00 12.50 262.50 673.00 870.50a4305.00
1968819.00a651.00 485.50 410.50a130.00 27.50 0.00 3.50 57.50 384.50 635.50a970.50 4575.00
19691302.00 870.50 614.50 368.00 111.50 14.50 0.00 5.50 54.00 423.50 632.00 884.00 5280.00
1970967.50 648.00 616.00 471.00 158.00 44.50 0.00 0.00 142.50 411.50 690.50 897.50 5047.00
1971800.00 675.00 693.50 407.00 159.50 86.00 16.00 1.00 145.00 390.00 642.00 852.41b4867.41
1972912.00a781.50a512.00 489.50 155.00 31.00 0.50 -----z122.50a362.00 685.50 1095.00 5146.50a
19731054.50 746.50 536.00 368.50 169.00 57.00 3.50 7.00 71.50 332.50 690.00 757.50 4793.50
19741103.50 598.50 561.72b381.50 233.00 34.00 9.00 0.00 42.00 349.00a584.50 740.00 4636.72
1975901.00 810.00 665.50 509.00 205.50 61.50 0.00b5.50a62.66b325.00 651.50a849.50 5046.66
1976825.50a714.00a674.00 415.00a160.50 96.00 4.50 10.86b32.00 374.00 699.50 969.50 4975.36
19771168.50 657.00 616.00 263.00 266.50 22.00a9.50 7.00 128.50 411.00 726.00 857.00 5132.00
19781009.50 686.42b564.11c399.27b244.50 33.50 0.50 17.59b91.00a392.50 894.00 1023.50 5356.38
19791393.33d802.00 601.00 376.50a-----z43.00 -----z0.00 29.50 235.50 772.64b770.50a5023.98b
1980-----z-----z641.00 317.50 174.50 80.00a1.50a13.00 50.00a382.00a618.50 809.00 3087.00b
1981821.00 666.00a541.00 375.50 186.00a80.00a16.50 0.00 92.70b399.31b623.50 891.00 4692.51
19821015.96e717.58b607.50c471.00a185.17b47.50 7.50 0.00a83.50 388.00 727.15c887.59b5138.45
1983749.00a616.50 473.79b380.50 160.71c36.00a4.00a0.00 137.75b377.50 537.50 1196.38b4669.64
1984952.00 712.00 510.52b401.00 -----z82.00a2.00 2.00 140.00a428.50a708.50 1130.00 5068.52a
19851161.00 875.42b614.50a291.00a136.00a31.50a0.00 -----z169.00 387.50 -----z1273.50a4939.42b
1986914.50a719.50 483.00 395.50a220.50 8.00 19.00 0.00o99.50q318.50 581.00a967.00 4626.50b
19871007.50a667.00a517.00a254.50 95.50 30.50 6.00a0.00 44.00 341.00 593.50 940.00 4496.50
1988979.50 712.50 568.50 324.50 176.50a76.50 4.50 0.00 91.66b206.00 535.00 958.00 4633.16
1989791.00a1064.00 634.66b291.55b172.00a12.00a0.00a3.00a27.50f346.50 568.00 923.00 4805.71a
1990736.07c738.35b344.00l251.33c179.50 53.86b5.00 0.00 4.00 379.50 513.50a1171.50 4032.61a
19911029.83b577.00 654.00 366.00 211.00 82.50 0.00 0.00 -----z338.00a637.00a802.50 4697.83a
1992792.50 635.00 -----z266.00a110.69b20.50 6.00a22.00a124.00 324.00 658.50a929.50a3888.69a
19931241.79c925.00a368.00n354.50 101.00 -----z1.50a14.50 79.00 279.00a834.00 849.50 4679.79b
1994769.00 794.50 506.50a257.50a-----z40.00 0.50 0.00b6.50a344.50 692.50 857.00 4268.50a
1995939.44d589.50a590.50a382.50 144.00a61.00 0.50 5.50 44.50 392.59b553.50 873.50a4577.03
1996970.00 946.50 622.50 332.50 240.50 31.00 1.00 0.00a110.50 339.00a676.00a1011.50 5281.00
1997944.00 702.00 545.50 413.50 132.00 30.55b0.00a0.00 46.50a355.50 640.00 846.00 4655.55
1998862.00 594.00a512.50a374.00 169.50 9.50 0.00 1.00 19.00 372.00a505.95b893.50 4312.95
1999738.00 610.00 584.00 439.50 259.00a61.50 11.00a0.00 92.50 381.50a508.00a721.00a4406.00
2000853.50 712.50a562.50a272.00a155.00 51.79b3.50a4.66b106.50a390.50 834.00 994.00 4940.44
2001928.50a786.50 563.00 412.00 157.00a73.00 1.03b1.00a33.50a362.07b588.80b767.22d4673.63
2002774.44d700.00a659.00a359.39b244.82c47.50a4.50 4.00 77.50 427.50 676.50 756.50 4731.66
2003738.10b669.00a439.00a354.00 189.00 17.50 0.00a0.00 36.00 220.50a762.00 835.50a4260.60
20041049.50a754.96b450.00d291.50 123.00 53.50 0.00 0.00a50.50a276.21b642.50a819.00 4510.67
2005989.00 741.38d478.00 -----z105.52b34.50 0.00 0.00b67.50 270.56d679.50 1050.56d4416.50a
2006462.00j788.50 581.50a358.00 182.50 9.50 0.00a0.00 67.50 354.00 616.50a960.00a3918.00a
20071028.00 725.00 524.00 376.50 120.50 43.50b0.00a3.50 92.50 381.50 662.50 826.00a4783.50
20081031.50 676.50 629.50 495.50 160.71c66.00a0.00a4.50a71.50 404.50 596.50 1078.50 5215.21
2009927.00 770.00a695.00 378.55b183.00 12.43b0.00c0.00 41.50 448.00 626.00 1128.00 5209.48
2010765.00b647.00 547.50 419.00 252.00 49.00a5.36c9.00a48.00 319.50a696.00 889.00a4646.36
2011889.50 768.98b595.50 487.82b238.39c59.00a4.00 0.00 43.50b291.21b667.50 971.50 5016.90
2012905.50 730.07b576.00 343.00 191.50a68.00a3.50 4.50 -----z346.00 -----z495.50m3168.07c
20131010.00 -----z585.00 -----z-----z-----z-----z0.00 57.00 -----z717.00 1098.50 3467.50f
2014902.50 -----z559.50 -----z127.24b21.00 0.00 0.00 48.50a185.50a723.50 833.00 3400.74b
2015884.00 608.50 447.00 -----z-----z-----z-----z-----z-----z-----z-----z-----z1939.50i
Period of Record Statistics
MEAN941.04 714.21 576.74 366.45 172.10 41.56 3.28 4.10 71.58 344.67 659.24 921.47 4799.88
S.D.152.66 101.24 65.90 67.80 48.13 23.48 4.60 5.95 39.09 60.98 89.24 125.93 312.05
SKEW0.82 0.83 -0.15 0.07 0.03 0.39 1.75 1.58 0.47 -0.82 0.59 0.63 0.07
MAX1393.33 1064.00 695.00 509.00 266.50 96.00 19.00 22.00 169.00 448.00 894.00 1273.50 5356.38
MIN670.50 513.00 439.00 250.00 66.50 2.00 0.00 0.00 4.00 185.50 505.95 721.00 4260.60
YRS56.00 55.00 55.00 55.00 54.00 56.00 56.00 55.00 54.00 57.00 56.00 57.00 40.00