PLAIN, WASHINGTON

Monthly Total Heating Degree Days

(456534)

Base Temperature = 65 F

File last updated on Jul 25, 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
1948 0.00 z 0.00 z 0.00 z 0.00 z 0.00 z 0.00 z 138.00 189.50 317.00 650.50 897.50 1379.00 3571.50
1949 1684.00 1184.96 c 904.00 619.50 336.00 310.50 139.00 142.50 286.00 663.50 715.00 1154.50 8139.46
1950 1814.50 1093.00 958.00 718.00 489.36 c 227.00 45.00 35.00 239.00 693.50 447.50 p 1041.50 7353.86
1951 1246.00 1040.50 1059.50 0.00 z 0.00 z 204.00 75.00 122.50 280.00 690.00 0.00 z 0.00 z 4717.50
1952 1433.23 a 1059.00 912.50 593.00 390.82 c 282.00 91.00 97.00 186.00 425.00 975.50 1147.00 7592.05
1953 976.00 383.00 o 696.50 f 651.50 463.50 332.00 104.62 c 96.00 264.00 530.00 853.50 991.50 5262.62
1954 1342.50 946.50 1011.63 a 731.90 a 416.43 a 312.00 124.57 d 168.50 286.50 661.00 741.50 1160.00 7903.04
1955 1164.50 1012.50 1085.00 805.50 563.68 a 209.00 146.50 83.00 279.83 a 654.00 1170.50 1381.50 8555.51
1956 1283.00 1287.39 a 631.00 m 521.67 c 220.88 c 293.50 50.00 60.50 255.00 645.50 1006.00 1094.50 6717.93
1957 1616.50 1036.50 716.00 g 316.00 m 251.00 193.00 132.04 d 176.50 181.00 655.00 839.46 b 746.00 h 5081.00
1958 1086.50 796.00 885.00 638.00 237.00 108.50 24.00 0.00 z 0.00 z 0.00 z 978.00 1050.00 5803.00
1959 1189.00 968.50 853.50 595.34 a 478.00 248.50 106.50 127.50 318.10 a 579.50 968.79 a 810.00 g 6433.24
1960 815.50 j 907.06 b 581.50 i 0.00 z 404.66 c 0.00 z 28.50 0.00 z 336.50 537.00 931.03 a 1248.61 d 4393.36
1961 1191.90 b 844.08 d 853.05 c 382.50 k 0.00 z 0.00 z 0.00 z 0.00 z 0.00 z 0.00 z 0.00 z 0.00 z 2889.03
1962 1288.71 c 943.60 c 749.50 f 581.25 b 509.43 a 95.00 l 164.96 c 0.00 z 217.50 b 0.00 z 850.18 b 1034.48 d 5590.12
1963 1298.68 c 754.78 e 814.27 a 473.00 i 0.00 z 0.00 z 0.00 z 0.00 z 0.00 z 0.00 z 497.00 l 731.00 k 2867.73
1964 1104.12 a 930.07 a 711.00 f 679.29 b 446.29 b 224.42 d 39.50 g 157.07 a 247.00 h 590.72 d 923.57 b 988.50 g 5055.55
1965 1139.00 859.92 b 897.45 a 545.89 b 463.85 d 182.78 c 69.23 a 103.13 e 306.11 c 484.78 b 747.41 a 535.00 p 5799.56
1966 727.00 l 859.04 c 859.70 c 562.00 323.95 a 233.79 a 69.00 f 66.02 d 100.71 b 574.50 789.31 a 1010.27 c 5379.29
1967 985.91 c 769.46 b 826.15 a 690.00 389.50 105.00 a 35.43 c 7.20 c 81.00 i 360.50 h 0.00 z 0.00 z 3808.65
1968 0.00 z 0.00 z 0.00 z 0.00 z 408.00 223.50 63.00 158.00 238.00 687.50 894.00 1298.00 3970.00
1969 1542.50 498.50 o 892.00 657.00 300.00 96.50 100.50 114.50 261.00 626.50 842.00 1123.00 6555.50
1970 1233.00 854.00 874.00 715.50 402.50 125.50 56.50 67.00 369.50 658.00 951.50 668.50 n 6307.00
1971 1135.00 925.50 1008.50 696.50 355.00 296.00 124.00 38.50 386.50 636.00 866.00 1214.00 7681.50
1972 1276.00 1061.50 862.00 757.50 338.50 183.50 116.50 54.00 376.00 591.50 835.50 1298.00 7750.50
1973 1280.00 917.00 771.00 566.00 384.50 236.00 78.00 125.50 245.50 584.50 1006.50 1033.50 7228.00
1974 1294.00 844.00 883.50 622.50 505.00 166.50 97.50 69.50 188.50 540.00 843.50 1044.50 7099.00
1975 1197.50 1012.00 945.50 713.00 436.00 244.00 53.00 142.50 217.50 634.50 945.50 1081.50 7622.50
1976 1097.50 972.00 924.50 650.50 394.00 297.50 95.50 106.50 177.00 578.00 823.50 1044.00 7160.50
1977 1246.50 830.00 822.00 505.50 478.50 107.00 116.00 68.50 308.50 594.00 977.00 1151.50 7205.00
1978 1082.00 861.00 778.00 606.00 428.00 126.00 39.78 a 118.83 a 296.50 529.50 991.00 1263.00 7119.62
1979 1523.00 1014.00 811.00 598.00 363.50 177.50 52.50 31.00 161.50 455.50 973.50 996.50 7157.50
1980 1407.50 960.00 832.50 497.50 340.50 235.50 61.50 129.00 238.00 528.50 859.00 1055.50 7145.00
1981 950.50 897.00 703.00 603.50 391.50 290.00 86.00 34.50 252.00 604.50 834.00 1141.50 6788.00
1982 1173.50 1001.00 863.50 707.00 419.00 129.50 89.50 85.50 252.50 593.50 1025.50 1203.50 7543.50
1983 1012.50 854.50 750.50 584.00 314.00 197.50 137.50 34.00 339.00 583.00 859.50 1430.50 7096.50
1984 1079.50 867.50 733.00 665.00 516.00 232.00 67.50 63.00 342.00 682.50 951.50 1358.50 7558.00
1985 1286.00 1032.50 863.00 598.50 332.00 162.50 4.50 67.00 358.00 637.00 1215.00 1385.50 7941.50
1986 1071.50 945.50 720.00 621.00 404.50 100.50 151.50 12.50 353.50 525.00 881.00 1151.00 6937.50
1987 1217.00 855.00 825.00 500.50 338.50 127.76 a 84.00 72.50 163.50 508.00 801.00 1220.50 6713.26
1988 1212.50 900.50 812.50 557.50 415.50 239.00 97.50 77.00 273.50 420.00 897.00 1153.00 7055.50
1989 1073.00 1169.50 917.50 524.50 420.50 141.50 96.00 97.50 230.00 577.00 789.00 1048.50 7084.50
1990 1040.00 980.50 793.00 496.00 451.00 219.50 38.00 75.00 128.00 692.00 817.50 1379.50 7110.00
1991 1226.00 793.00 873.00 637.50 454.50 282.50 60.50 65.00 161.00 610.50 936.00 1018.50 7118.00
1992 1065.00 858.00 643.50 546.00 278.50 104.50 69.50 83.50 309.00 575.50 915.00 1266.50 6714.50
1993 1342.00 1046.00 909.00 653.00 243.00 228.00 199.00 110.50 220.50 477.00 1012.00 1142.50 7582.50
1994 943.50 1023.00 768.00 502.50 328.50 238.50 42.00 69.00 137.50 616.50 1019.50 1198.50 6887.00
1995 1228.50 894.00 884.50 628.50 320.00 204.50 59.50 202.50 179.50 665.00 874.50 1147.00 7288.00
1996 1241.50 1128.00 857.50 624.00 539.00 239.00 83.00 86.00 314.50 654.00 966.00 1307.50 8040.00
1997 1170.00 921.50 895.50 705.00 362.00 255.50 94.50 47.00 219.00 633.50 856.00 1109.00 7268.50
1998 1163.50 865.50 793.50 585.50 336.00 171.50 15.00 47.00 118.00 610.00 843.50 1228.50 6777.50
1999 1021.97 a 930.50 915.50 643.00 501.50 274.50 97.50 49.50 290.50 629.50 800.00 1039.50 7193.47
2000 1178.00 968.00 840.00 528.50 434.00 198.00 97.00 102.00 302.00 620.50 1041.00 1246.00 7555.00
2001 1134.00 970.00 833.50 634.00 381.50 276.50 67.00 60.50 192.00 661.50 864.50 1105.50 7180.50
2002 1087.00 934.50 944.00 613.50 469.50 164.50 62.50 90.00 272.50 639.50 856.50 1041.50 7175.50
2003 1045.00 895.50 813.00 632.00 420.50 136.50 41.50 29.00 213.00 487.00 1013.00 1166.50 6892.50
2004 1185.50 932.00 748.00 505.50 367.50 149.00 44.50 52.50 295.00 545.50 881.00 1036.00 6742.00
2005 1160.50 889.50 731.50 560.00 302.50 246.50 36.00 37.50 286.00 545.50 978.00 1237.00 7010.50
2006 1011.50 987.00 889.50 620.00 384.50 185.36 b 16.00 l 0.00 z 0.00 z 0.00 z 0.00 z 0.00 z 4077.86
Period of Record Statistics
MEAN 1208.69 946.97 855.78 615.28 393.52 206.96 82.40 86.89 255.08 593.81 907.99 1164.45 7297.77
S.D. 178.59 105.35 86.94 73.10 78.40 63.69 40.66 45.53 70.11 69.40 98.16 120.20 426.33
SKEW 1.26 0.80 0.23 0.25 -0.12 -0.07 0.50 0.61 -0.22 -0.68 0.68 0.49 0.91
MAX 1814.50 1287.39 1085.00 805.50 563.68 332.00 199.00 202.50 386.50 693.50 1215.00 1430.50 8555.51
MIN 943.50 754.78 643.50 496.00 220.88 96.50 4.50 7.20 100.71 420.00 715.00 991.50 6713.26
NO YRS 55 55 51 52 55 54 54 53 53 53 53 49 39