WINTHROP 1 WSW, WASHINGTON

Monthly Total Heating Degree Days

(459376)

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
1906 0.00 z 0.00 z 989.00 0.00 z 296.50 54.00 v 0.00 20.00 156.50 0.00 z 968.00 0.00 z 2430.00
1907 0.00 z 0.00 z 0.00 z 0.00 z 0.00 z 0.00 z 0.00 z 0.00 z 171.92 d 0.00 z 0.00 z 0.00 z 171.92
1908 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 0.00 z 0.00 z 0.00
1909 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 182.50 v 1124.00 j 0.00
1910 1433.75 a 1313.00 790.00 123.50 x 0.00 z 11.00 z 0.00 z 71.50 w 0.00 z 88.00 y 557.00 p 1294.00 4830.75
1911 1563.84 c 1252.74 a 843.50 519.00 330.00 20.50 z 0.00 z 0.00 z 273.50 h 583.46 c 1139.48 a 1378.00 7610.03
1912 1476.50 1017.50 980.00 521.50 267.12 a 72.50 23.54 d 109.57 b 286.50 660.00 914.00 1302.00 7630.72
1913 1586.17 a 1300.00 999.50 495.00 b 340.50 105.00 a 75.43 a 57.00 231.50 643.50 896.50 1254.50 7984.60
1914 1240.50 1208.00 912.50 433.00 264.00 154.50 10.00 14.00 289.50 472.50 879.50 1477.00 7355.00
1915 1455.00 962.50 736.50 393.00 341.00 134.00 43.00 0.00 206.00 507.50 1123.50 1351.00 7253.00
1916 1803.00 1230.00 986.00 533.00 410.48 b 152.00 80.50 31.50 206.00 539.00 1072.50 1598.50 8642.48
1917 1508.50 1195.00 1123.50 641.50 308.50 219.50 18.60 a 3.00 167.50 392.50 719.48 a 1098.43 a 7396.02
1918 1149.00 1197.50 0.00 z 0.00 z 0.00 z 0.00 z 0.00 z 0.00 z 27.50 362.50 859.00 1165.00 4760.50
1919 1287.50 1188.00 999.50 489.00 361.50 163.50 0.00 v 3.50 149.50 201.00 w 971.00 1470.20 d 7083.20
1920 536.00 r 763.50 f 802.50 0.00 z 0.00 z 0.00 z 0.00 z 0.00 z 0.00 z 0.00 z 253.50 r 911.06 d 1713.56
1921 0.00 z 0.00 z 0.00 z 0.00 z 283.00 111.00 26.00 25.00 350.00 480.50 967.00 1389.50 3632.00
1922 1682.00 1382.50 1090.00 603.00 376.50 33.50 0.00 29.00 158.00 447.50 994.50 1516.00 8312.50
1923 1371.50 1244.00 965.00 503.00 337.50 140.00 14.00 17.50 138.50 494.00 840.00 1326.00 7391.00
1924 1561.50 976.00 805.00 587.50 186.50 89.50 16.00 27.50 211.00 585.00 1038.50 1530.88 a 7614.88
1925 1406.50 927.50 770.50 473.50 235.00 135.50 0.00 75.00 185.50 584.00 921.50 1046.00 6760.50
1926 1322.50 859.50 644.00 390.50 332.50 64.00 4.50 16.50 364.50 521.00 807.50 1294.50 6621.50
1927 1414.50 1081.50 898.00 585.00 398.50 76.00 9.50 18.50 291.00 614.00 988.50 1521.00 7896.00
1928 1273.00 1006.50 812.50 625.00 227.00 133.00 11.50 22.00 226.50 626.50 918.50 1442.00 7324.00
1929 1740.00 1432.50 781.00 644.50 325.00 127.50 16.50 39.50 296.50 551.28 a 1023.50 1306.00 8283.78
1930 1949.50 1071.50 809.00 441.00 371.00 197.00 14.50 25.00 210.50 630.50 1037.00 1294.77 a 8051.27
1931 1227.50 1110.50 840.00 525.00 248.00 115.00 10.00 14.00 243.50 546.00 1052.50 1313.50 7245.50
1932 1506.50 1247.00 913.00 469.00 312.50 55.50 46.00 49.00 201.00 561.00 897.50 1362.00 7620.00
1933 1359.00 1310.50 912.00 524.00 440.00 163.50 21.00 27.50 327.00 580.00 842.50 1157.00 7664.00
1934 1269.00 994.50 762.50 333.62 a 271.50 89.50 28.50 18.00 292.50 537.00 799.00 1296.00 6691.62
1935 1405.00 1096.50 1010.50 614.00 334.50 120.50 53.50 64.00 175.00 608.00 1102.50 1314.50 7898.50
1936 1406.88 a 1705.00 1003.00 470.69 a 210.00 127.00 12.00 8.50 265.50 484.50 1073.00 1285.47 a 8051.54
1937 1894.10 a 1323.54 b 919.00 661.00 361.50 141.00 8.00 87.50 163.00 491.00 870.00 1258.08 a 8177.72
1938 0.00 z 404.00 q 0.00 z 0.00 z 323.00 76.50 8.50 41.50 86.00 510.50 1013.00 1355.22 a 3414.22
1939 1219.50 1172.89 a 949.08 e 456.43 b 285.50 178.00 22.50 22.50 170.50 533.50 872.50 1109.28 a 6992.18
1940 1299.42 a 1054.50 761.50 457.00 255.50 65.00 5.50 11.00 98.00 461.00 1041.00 1198.67 a 6708.08
1941 1275.00 983.00 687.00 396.00 329.50 120.50 3.50 75.00 329.00 560.00 829.50 1234.00 6822.00
1942 1431.17 a 1041.50 884.50 465.00 378.00 200.00 21.50 40.50 133.50 496.50 1066.50 1356.25 a 7514.92
1943 1644.00 1105.00 1057.00 467.00 423.09 d 206.00 38.50 37.50 h 137.00 516.00 879.50 1235.00 7708.09
1944 1391.79 b 1100.50 919.00 504.00 318.00 99.50 40.00 30.00 163.50 400.50 895.00 1408.00 7269.79
1945 1275.02 d 961.50 896.00 456.50 i 306.38 a 164.50 19.12 a 20.00 247.50 483.60 a 1069.00 1322.15 a 6764.77
1946 1319.50 1133.50 716.50 f 521.00 240.50 220.50 33.50 30.50 243.00 668.00 1113.10 a 1350.50 6873.60
1947 1493.50 1101.50 785.00 465.54 b 208.50 139.50 27.79 b 0.00 z 209.00 522.00 890.50 1189.50 7032.33
1948 1456.00 1203.50 1023.50 652.00 386.47 a 55.34 a 78.02 a 81.63 a 240.60 e 627.48 b 980.50 1626.00 8411.04
1949 1847.50 1280.50 889.70 a 481.50 213.00 149.00 39.78 a 44.00 181.50 657.00 769.14 a 1333.00 7885.62
1950 1985.00 1117.00 930.00 644.00 361.50 131.90 a 16.53 a 7.23 a 166.07 b 622.50 973.00 1113.93 a 8068.67
1951 1390.35 a 1161.50 1089.00 540.50 303.00 116.50 13.43 a 46.50 165.50 572.47 a 980.00 1543.00 7921.75
1952 1558.00 1186.00 934.50 474.00 293.00 142.00 31.50 58.50 127.50 409.00 999.50 1133.50 7347.00
1953 1146.00 1004.89 a 799.00 568.00 354.00 230.50 27.50 49.00 197.50 495.00 872.00 1174.00 6917.39
1954 1500.00 988.30 a 1005.20 d 664.00 322.92 a 268.45 a 57.00 84.00 258.00 651.00 a 752.50 1336.50 7887.86
1955 1409.00 1177.00 1180.00 710.00 440.00 139.00 90.86 b 37.00 235.50 634.00 1266.21 a 1541.73 a 8860.30
1956 1368.50 1469.50 1111.87 a 549.50 246.00 204.00 37.00 35.50 229.66 a 621.50 1107.50 1337.50 8318.02
1957 1770.00 1231.00 527.50 l 502.00 155.50 105.00 47.50 102.00 107.50 598.50 932.50 1208.50 6760.00
1958 1238.00 842.00 829.00 562.50 168.50 57.50 5.00 13.00 263.00 550.00 1140.00 1265.50 6934.00
1959 1412.00 1155.50 932.50 546.00 367.50 166.50 48.50 109.03 b 292.50 589.00 1051.00 1261.50 7931.53
1960 1460.00 1103.00 959.50 569.00 407.00 146.00 2.00 100.50 241.00 537.00 1052.00 1469.00 8046.00
1961 1339.50 931.50 871.00 558.50 323.00 72.50 22.00 4.50 289.50 678.50 1151.00 1402.50 7644.00
1962 1508.15 a 964.50 941.00 478.00 398.50 165.50 71.50 73.00 193.50 568.00 877.50 1168.00 7407.15
1963 1416.00 902.00 789.00 589.82 b 338.50 119.00 47.50 30.50 107.00 506.00 950.50 1309.50 7105.32
1964 1355.00 1199.36 a 962.50 585.00 369.00 145.00 0.00 z 48.00 t 282.50 575.00 979.50 1492.50 7945.36
1965 1299.50 1110.00 993.50 523.00 413.00 113.50 33.00 72.00 354.50 544.00 901.50 1330.50 7688.00
1966 1522.50 1050.50 982.00 598.00 299.00 222.50 74.50 i 46.00 h 94.00 622.00 866.00 1141.50 7398.00
1967 1207.50 891.00 868.50 683.00 365.50 84.50 27.50 11.00 110.00 595.50 924.00 1373.50 7141.50
1968 1321.00 1042.79 e 0.00 z 657.50 390.71 b 191.25 b 36.00 131.00 236.50 686.00 979.50 1430.81 b 7103.06
1969 1889.45 a 1225.00 995.32 c 593.50 254.00 57.00 65.10 a 74.00 238.27 d 656.88 b 969.11 b 1283.40 a 8301.03
1970 1492.00 1030.00 0.00 z 661.50 326.00 76.00 18.08 a 25.00 320.50 645.00 1035.50 1463.09 c 7092.67
1971 1364.50 1086.50 1080.87 a 630.00 241.50 0.00 z 64.21 c 21.70 a 380.19 d 659.30 c 986.90 a 1581.00 c 8096.67
1972 1537.00 941.50 f 908.50 692.00 281.00 0.00 z 89.56 d 43.83 b 395.17 a 615.23 e 893.28 a 0.00 z 5455.56
1973 1457.00 b 1020.00 788.50 0.00 z 0.00 z 0.00 z 27.00 60.50 185.00 606.57 a 1097.50 1210.00 6452.07
1974 1506.08 a 989.50 911.83 b 0.00 z 438.00 106.50 61.50 25.00 168.00 539.00 0.00 z 1228.00 5973.41
1975 1462.00 1208.00 994.50 632.00 343.00 166.50 10.50 66.00 183.50 601.50 1010.50 1245.00 7923.00
1976 1339.72 a 1110.00 991.50 564.50 326.00 228.50 40.50 77.50 144.50 561.50 939.50 1262.70 c 7586.41
1977 1472.50 b 883.00 801.50 464.50 394.00 65.50 49.50 43.50 272.50 606.50 990.00 b 1377.43 a 7420.43
1978 1284.00 967.50 813.00 541.00 363.50 97.00 15.00 79.00 277.00 588.50 1104.83 a 1532.50 7662.83
1979 1709.00 1131.50 843.95 b 616.00 299.00 104.00 41.00 7.00 g 166.00 482.10 b 1069.14 a 1136.09 d 7597.78
1980 1623.00 1058.50 890.50 488.00 298.78 b 203.50 57.50 81.00 228.00 558.50 939.00 1253.00 7679.28
1981 1065.50 992.00 723.50 596.00 362.50 253.00 73.00 20.00 226.00 625.50 879.00 1408.50 7224.50
1982 1412.50 1116.50 880.00 690.00 383.00 0.00 z 71.50 57.00 241.50 613.00 1096.00 1398.00 7959.00
1983 1158.00 956.50 768.00 566.00 302.50 158.00 102.00 21.00 329.50 598.50 889.50 1697.50 7547.00
1984 1353.50 1044.00 775.00 644.00 458.50 182.50 30.50 43.00 357.50 694.50 1046.00 1657.50 8286.50
1985 1428.50 1294.50 942.50 559.50 279.50 119.50 4.00 53.50 337.00 634.00 1347.00 1525.00 8524.50
1986 1249.00 1073.50 756.00 578.50 316.00 51.00 58.00 0.00 291.00 483.00 906.00 1280.00 7042.00
1987 1333.00 a 921.00 750.72 a 406.50 247.00 75.50 28.50 28.00 114.50 463.00 833.00 1382.50 6583.22
1988 1443.50 1085.50 780.50 455.00 306.50 154.00 46.00 21.00 206.00 424.00 938.00 1293.50 7153.50
1989 1315.00 1220.00 933.00 458.00 333.50 57.00 32.00 54.00 157.50 552.00 836.50 1156.50 7105.00
1990 1204.00 1147.00 767.00 415.00 347.00 154.50 0.00 z 40.00 74.00 647.00 872.00 1497.50 7165.00
1991 1366.50 769.00 835.00 539.00 323.50 190.50 16.50 23.00 97.00 590.00 972.00 1206.00 6928.00
1992 1206.00 856.00 614.50 494.00 225.50 43.50 26.00 66.50 269.50 525.50 906.50 1482.00 6715.50
1993 1508.50 1095.50 890.00 576.50 163.00 150.50 97.50 63.50 183.50 458.50 1097.00 1271.50 7555.50
1994 1179.50 1072.00 751.00 405.50 260.50 166.00 16.50 0.00 z 91.00 543.00 1201.50 1321.00 7007.50
1995 1318.50 969.00 907.00 560.00 223.50 121.50 14.50 129.50 128.50 615.00 946.00 1265.00 7198.00
1996 1410.00 1187.50 855.00 528.00 423.00 142.50 40.00 44.50 243.00 615.00 1008.50 1508.50 8005.50
1997 1346.00 1089.50 915.50 604.50 264.50 178.00 41.00 26.50 152.50 611.50 845.50 1231.50 7306.50
1998 1269.50 837.50 732.00 511.50 208.00 91.50 0.50 18.50 90.50 551.00 822.00 1319.50 6452.00
1999 1159.50 990.00 898.00 562.00 414.50 178.00 54.00 26.00 226.00 610.50 770.00 1104.50 6993.00
2000 1317.50 1042.50 792.00 460.50 335.50 120.50 53.00 59.00 224.00 563.50 1062.50 1335.50 7366.00
2001 1201.00 1070.00 755.50 575.00 292.50 179.50 23.00 24.00 121.50 611.50 829.50 1260.00 6943.00
2002 1228.00 1012.50 960.00 527.00 378.50 97.00 39.50 51.50 192.00 577.00 871.50 1076.50 7011.00
2003 1167.00 1011.00 781.00 533.00 349.50 68.00 12.00 4.50 148.50 417.50 1057.50 1384.00 6933.50
2004 1270.00 1033.00 699.50 437.00 314.00 105.00 10.00 0.00 z 230.00 516.00 896.50 1125.50 6636.50
2005 1298.00 952.00 699.00 491.00 243.50 139.00 16.50 22.50 223.50 495.00 0.00 z 1352.50 5932.50
2006 1117.50 1075.00 856.00 501.00 320.50 99.50 10.00 24.00 174.00 512.50 1041.50 1333.00 7064.50
2007 1478.00 952.50 787.50 543.00 273.00 136.50 3.50 30.50 192.50 602.50 992.50 1406.00 7398.00
2008 1514.00 1064.00 882.50 644.50 220.50 148.50 15.00 58.00 207.00 557.50 845.00 1445.50 7602.00
2009 1431.00 1065.50 956.50 543.50 310.50 62.50 15.00 23.50 123.00 623.00 891.00 1360.50 7405.50
2010 1082.50 820.00 742.50 543.00 422.50 152.50 38.50 52.00 207.00 462.50 1003.00 1224.00 6750.00
2011 1289.50 1100.00 871.00 680.50 398.50 165.50 55.00 6.50 144.50 570.40 a 1055.00 1327.32 a 7663.72
2012 1394.00 1045.50 909.50 532.00 354.00 210.00 23.50 31.50 145.50 567.50 897.93 a 1235.50 7346.43
2013 1479.50 966.00 803.00 12.50 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 3248.50
Period of Record Statistics
MEAN 1408.73 1089.34 878.75 540.91 317.73 133.38 32.30 41.76 208.72 560.45 965.82 1324.98 7498.25
S.D. 187.12 148.34 111.79 80.13 67.75 51.65 24.27 29.37 76.16 71.26 112.26 141.86 536.53
SKEW 0.94 0.86 0.19 -0.02 -0.21 0.25 0.88 0.97 0.27 -0.50 0.47 0.13 0.27
MAX 1985.00 1705.00 1180.00 710.00 458.50 268.45 102.00 131.00 395.17 694.50 1347.00 1697.50 8860.30
MIN 1065.50 769.00 614.50 333.62 155.50 33.50 0.00 0.00 27.50 362.50 719.48 911.06 6452.00
NO YRS 101 100 98 95 100 95 96 93 102 100 100 102 77