GREAT SAND DUNES NAT, COLORADO

Monthly Total Heating Degree Days

(053541)

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
1950 0.00 z 0.00 z 0.00 z 0.00 z 0.00 z 0.00 z 0.00 z 0.00 z 296.67 c 373.50 675.00 f 1065.50 1735.67
1951 1222.00 1039.50 966.00 735.50 416.00 192.00 4.00 53.50 209.50 578.50 1061.00 1266.87 a 7744.37
1952 1338.50 1195.50 1123.50 666.00 422.50 63.50 40.50 55.50 256.00 510.47 a 1122.00 1441.50 8235.47
1953 1126.50 1098.50 917.00 766.50 572.00 98.00 50.50 87.00 216.50 598.00 998.50 1417.00 7946.00
1954 1283.92 a 902.00 1031.00 530.00 399.00 130.34 a 19.63 a 78.50 193.45 a 482.50 851.00 1300.50 7201.84
1955 1389.50 1257.00 998.00 712.50 456.00 194.50 30.50 37.50 185.00 522.00 918.00 1130.50 7831.00
1956 1135.00 1224.50 955.00 733.00 349.50 75.00 52.00 166.50 198.00 630.50 1093.00 1229.50 7841.50
1957 1269.00 825.00 961.52 a 772.00 557.00 166.00 61.00 96.00 284.00 607.50 1139.50 1220.50 7959.02
1958 1336.50 983.00 1090.50 755.50 338.50 72.50 32.00 23.00 204.00 563.50 938.50 1069.00 7406.50
1959 1274.00 1087.00 1004.50 708.50 405.00 74.00 33.21 c 68.50 271.00 650.50 958.50 1146.50 7681.21
1960 1453.50 1326.50 947.00 629.50 442.50 111.50 44.00 25.00 193.50 593.50 879.00 1320.00 7965.50
1961 1347.50 1028.50 972.50 723.50 368.50 94.50 46.00 67.50 340.00 617.50 1061.50 1429.00 8096.50
1962 1383.00 1004.50 1124.50 582.50 410.00 182.50 66.50 63.50 278.50 546.50 845.00 1083.50 7570.50
1963 1420.50 997.00 964.50 607.50 281.50 134.00 8.00 73.48 d 192.00 458.00 953.50 1278.00 7367.98
1964 1386.00 1315.00 1165.00 746.50 389.50 171.50 13.00 116.00 265.00 524.00 997.24 a 1418.00 8506.74
1965 1279.50 1157.50 1158.50 700.50 482.50 240.00 39.50 130.50 381.50 524.50 832.00 1164.00 8090.50
1966 1442.00 1281.50 910.00 653.00 325.00 177.00 11.50 90.00 256.00 619.50 835.50 1227.50 7828.50
1967 1263.50 1050.00 784.50 631.00 455.00 230.36 b 71.50 204.50 311.50 571.50 901.50 1448.50 7923.36
1968 1466.50 1177.00 1020.00 810.50 500.65 a 135.50 54.00 163.50 316.67 c 560.07 a 1019.00 1350.00 8573.38
1969 1173.50 1112.74 a 1167.50 618.00 360.50 284.50 52.50 32.55 a 261.50 788.00 971.00 1243.62 a 8065.91
1970 1309.50 936.00 1068.50 824.50 389.50 215.00 14.50 40.50 331.00 739.50 910.00 1190.50 7969.00
1971 1235.50 1051.00 924.00 686.50 481.50 130.00 56.50 73.50 327.50 640.50 990.50 1323.50 7920.50
1972 1306.50 1009.00 766.50 592.00 433.50 137.00 56.50 72.00 258.50 557.50 1198.50 1417.00 7804.50
1973 1514.00 1194.50 1061.00 860.00 475.50 180.50 109.50 109.00 327.00 585.50 886.00 1258.50 8561.00
1974 1467.50 1205.50 830.28 a 685.50 338.00 166.50 0.00 z 148.00 297.50 508.29 b 983.79 a 1438.00 8068.87
1975 1439.50 1147.50 1003.00 763.50 485.50 192.50 39.00 75.50 294.00 526.00 1022.00 1307.00 8295.00
1976 1379.50 966.50 1021.40 b 683.79 a 441.50 164.50 22.22 a 92.00 262.22 c 669.50 961.50 1347.00 8011.63
1977 1427.00 1056.50 1042.00 610.50 385.50 54.00 42.22 b 55.50 209.00 525.50 855.00 1057.00 7319.72
1978 1203.32 a 1015.26 a 804.50 565.86 a 538.33 e 98.28 a 6.20 a 68.50 231.72 a 502.72 a 278.50 q 0.00 z 5034.68
1979 1552.07 a 1285.20 c 1063.09 b 690.58 d 443.96 c 168.62 a 36.50 108.00 208.00 0.00 z 1175.17 a 1176.50 7907.69
1980 1176.00 1019.00 1049.50 792.50 511.00 88.00 2.00 54.50 185.00 653.50 925.00 965.81 b 7421.81
1981 1111.35 a 990.50 1009.50 539.00 481.50 77.68 b 19.00 109.00 237.50 619.00 831.00 1222.95 a 7247.98
1982 1307.00 1119.00 959.00 729.00 479.00 175.50 32.50 53.50 282.00 693.00 964.00 1256.00 8049.50
1983 1249.00 1047.00 964.50 850.00 551.00 265.00 57.00 39.00 172.50 590.50 995.50 1416.00 8197.00
1984 1597.50 1303.00 1093.00 798.50 316.50 177.00 9.00 67.00 225.00 779.00 943.00 1231.00 8539.50
1985 1366.00 1227.50 922.50 636.00 398.50 127.50 53.50 41.00 336.50 598.50 957.50 1234.00 7899.00
1986 1094.00 942.15 a 803.00 640.50 456.22 a 170.00 72.00 51.50 315.50 706.00 986.50 1299.00 7536.36
1987 1399.50 1063.50 1061.50 730.50 464.00 91.50 37.00 0.00 z 0.00 z 496.00 0.00 z 1405.50 6749.00
1988 1562.50 0.00 z 0.00 z 0.00 z 0.00 z 131.00 21.00 57.87 a 314.50 489.50 987.50 1349.50 4913.37
1989 1393.00 1184.00 777.00 538.50 305.00 161.90 a 30.00 73.00 205.00 600.50 887.50 1253.50 7408.90
1990 1357.50 1029.50 853.50 607.00 461.50 76.50 64.50 94.00 177.50 603.50 915.00 1409.50 7649.50
1991 1440.00 952.00 947.50 704.00 400.50 147.50 52.50 71.00 279.50 552.50 1120.00 1514.00 8181.00
1992 1573.50 1249.50 1011.63 a 563.50 384.00 187.50 93.50 116.50 245.50 495.00 1173.50 1493.50 8587.13
1993 1378.50 1151.50 926.50 707.50 449.50 152.00 23.00 131.75 a 322.00 706.00 1082.50 1276.00 8306.75
1994 1239.00 1138.00 902.00 683.00 398.50 44.00 25.50 34.00 264.50 649.50 1045.00 1187.00 7610.00
1995 1254.50 811.50 894.00 787.00 575.50 208.00 115.50 24.00 308.50 593.50 847.00 1140.00 7559.00
1996 1285.50 963.50 936.50 684.50 239.00 85.00 17.50 55.50 317.50 660.50 901.50 1284.50 7431.00
1997 1313.00 1082.00 830.00 803.00 446.00 134.50 37.00 74.50 177.00 620.00 1027.00 1450.00 7994.00
1998 1321.00 1139.00 987.00 812.00 367.00 165.50 60.50 176.00 116.50 587.00 854.50 1176.50 7762.50
1999 1128.50 948.50 768.80 a 759.00 488.50 175.00 27.38 a 69.50 284.00 553.50 761.00 1261.50 7225.18
2000 1128.92 a 939.00 889.00 574.14 a 305.50 99.00 7.00 24.00 195.00 603.00 1156.00 1193.50 7114.05
2001 1345.00 1023.50 956.00 570.50 361.50 80.00 27.00 80.50 181.03 a 534.50 861.00 1300.00 7320.53
2002 1311.00 1134.00 973.50 487.50 357.50 29.00 9.00 46.50 234.00 629.50 953.00 1287.00 7451.50
2003 1034.50 1051.50 970.00 636.50 376.50 165.00 10.50 48.00 273.50 456.00 926.50 1221.00 7169.50
2004 1304.50 1275.00 759.00 682.50 343.50 113.50 72.50 87.00 252.50 622.00 931.00 1259.00 7702.00
2005 1143.50 1028.00 984.00 683.50 363.00 157.00 7.00 106.50 210.50 571.50 887.00 1268.00 7409.50
2006 1255.50 1040.00 931.00 582.00 320.00 56.00 41.50 68.50 0.00 z 665.00 901.00 1269.50 7130.00
2007 1475.00 1050.50 844.00 712.00 436.00 134.00 35.00 22.00 196.50 579.00 887.00 1453.00 7824.00
2008 1576.50 1199.00 1005.50 712.00 453.00 113.00 23.00 86.00 256.00 579.00 904.50 1304.50 8212.00
2009 1279.50 1000.00 894.50 751.00 337.00 232.50 21.00 65.50 278.50 733.00 879.00 1436.00 7907.50
2010 1312.50 1170.00 1015.50 656.00 436.50 65.50 28.50 46.50 139.50 542.50 992.00 1055.00 7460.00
2011 1321.00 1160.00 815.50 655.50 500.50 69.00 1.50 7.00 251.00 603.00 972.50 1429.50 7786.00
2012 1229.50 1158.00 769.50 527.00 353.00 22.50 19.00 32.00 209.50 565.00 869.00 1385.50 7139.50
2013 1589.50 1179.50 954.28 a 37.00 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 3723.28
Period of Record Statistics
MEAN 1328.22 1091.90 956.51 682.62 417.38 137.27 37.14 75.22 250.82 588.78 961.36 1281.48 7800.35
S.D. 132.02 119.66 104.79 87.91 74.04 58.44 25.17 40.58 56.03 78.17 98.83 122.66 398.65
SKEW 0.10 0.00 -0.10 -0.11 0.06 0.19 0.94 1.04 -0.03 0.22 0.61 -0.24 0.18
MAX 1597.50 1326.50 1167.50 860.00 575.50 284.50 115.50 204.50 381.50 788.00 1198.50 1514.00 8587.13
MIN 1034.50 811.50 759.00 487.50 239.00 22.50 1.50 7.00 116.50 373.50 761.00 965.81 7114.05
NO YRS 63 62 62 61 61 62 61 61 61 62 60 62 56