LAKE YELLOWSTONE, WYOMING

Monthly Total Heating Degree Days

(485345)

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 0.00 z 187.00 521.50 881.78 d 1438.50 1740.50 4769.28
1949 2053.50 1526.00 1367.00 978.50 741.00 546.50 338.00 328.00 565.18 b 1000.35 e 1006.50 1557.50 12008.02
1950 1758.00 1362.50 1474.50 1130.50 977.50 611.25 b 441.50 416.50 645.50 838.00 1217.50 1345.50 12218.75
1951 1745.00 1374.50 1541.50 1075.38 d 741.86 b 701.00 295.57 b 375.50 470.00 h 1007.00 1326.50 1643.00 11826.82
1952 1696.50 1580.50 1606.32 a 990.50 752.00 490.00 405.00 380.00 395.50 g 787.50 1378.00 1465.00 11531.32
1953 1324.50 1415.50 1367.50 1208.00 927.00 565.50 245.93 a 340.00 276.00 o 780.00 1078.50 1563.00 10815.43
1954 1494.50 1040.50 f 1513.50 1064.00 777.50 639.00 121.50 426.50 556.50 934.00 1078.00 1556.00 10161.00
1955 1780.00 1543.50 1653.00 1163.50 844.50 591.60 e 273.00 269.00 594.00 889.00 1408.50 1541.00 12550.60
1956 1613.50 1761.00 1528.00 1068.50 726.00 322.80 e 282.21 b 378.72 a 507.93 a 896.50 1344.00 1531.92 a 11961.07
1957 1915.00 1273.00 1438.50 1083.50 716.00 519.64 b 294.00 276.00 558.50 895.90 a 1369.50 1470.90 b 11810.44
1958 1665.00 1246.50 1472.50 a 1160.50 694.73 c 364.00 f 407.50 266.00 0.00 z 838.00 1247.59 a 1378.00 10376.32
1959 1600.00 1406.50 1449.50 1075.00 901.00 454.66 a 273.83 a 256.50 626.90 a 903.50 1303.50 1543.50 11794.38
1960 1661.00 1647.00 1317.50 1014.50 805.50 451.50 256.00 372.50 506.50 868.00 1233.00 1536.00 11669.00
1961 1677.00 1253.50 1335.00 1107.00 765.00 372.93 a 246.50 254.00 743.50 962.50 1289.00 1685.00 11690.93
1962 1861.00 1328.50 1462.50 1015.00 799.05 b 386.00 g 389.50 398.50 551.00 774.50 1132.50 1427.50 11139.55
1963 1826.00 1237.00 1419.50 1106.50 760.50 562.50 b 344.62 a 333.77 a 468.10 a 750.20 a 1186.00 1530.00 11524.69
1964 1737.50 1713.00 1595.00 1052.50 834.33 b 617.31 d 270.73 a 400.00 592.50 864.50 836.50 l 1591.50 11268.87
1965 1647.50 1550.00 1808.50 1041.50 897.97 a 593.04 b 330.50 0.00 z 777.93 a 799.00 1103.50 1483.50 12032.93
1966 1648.50 1550.50 1390.00 1123.50 721.30 c 553.85 d 234.00 342.66 c 432.60 e 953.85 e 1171.07 b 1532.50 11654.33
1967 1512.50 1426.50 1076.00 g 1151.00 894.23 e 559.82 b 275.90 a 307.00 516.72 a 910.88 a 1170.00 e 1710.50 10435.06
1968 1695.50 1358.00 1315.00 1186.50 581.50 k 329.50 k 318.02 b 426.00 0.00 z 0.00 z 1070.00 f 1238.50 f 6299.02
1969 1553.50 1454.50 1557.00 964.00 698.50 538.80 e 261.00 174.00 291.00 i 718.50 k 1201.50 1491.50 9894.30
1970 1553.50 1332.50 1463.00 1268.00 844.00 41.50 y 268.84 b 252.13 a 0.00 z 0.00 z 1230.50 1602.38 b 9814.86
1971 1570.00 1480.50 1491.50 1136.00 843.50 0.00 z 374.50 209.25 a 371.00 l 0.00 z 1302.50 1671.50 10079.25
1972 1698.00 1453.00 1285.00 1129.00 838.50 529.00 426.00 389.00 752.00 973.52 e 1299.50 1715.00 12487.52
1973 1833.00 1460.50 1451.50 1205.00 849.50 542.00 378.50 364.00 623.50 845.55 b 1305.00 1549.00 12407.05
1974 1707.00 1491.00 1420.50 0.00 z 972.50 485.00 257.50 415.00 597.50 864.68 c 1256.00 1641.00 11107.68
1975 1777.00 1521.00 1458.50 1314.00 976.00 667.50 299.00 495.50 652.50 958.00 1424.42 d 1468.50 13011.92
1976 1675.50 1506.00 1609.50 774.00 h 0.00 z 598.50 307.86 b 424.38 b 536.40 e 962.50 0.00 z 0.00 z 7620.64
1977 1851.50 1437.50 1174.50 h 0.00 z 475.50 o 0.00 z 355.00 0.00 z 0.00 z 0.00 z 0.00 z 0.00 z 3644.00
1978 0.00 z 0.00 z 0.00 z 0.00 z 0.00 z 0.00 z 0.00 z 437.50 613.27 d 858.91 b 1296.60 e 1885.00 5091.28
1979 2103.57 c 1410.50 d 1386.00 810.00 g 837.00 b 559.29 b 288.50 333.50 509.50 868.00 1430.00 1478.50 11204.36
1980 1756.00 1369.00 1444.50 1073.00 750.00 493.97 a 262.98 a 384.50 562.76 a 912.50 1184.50 1331.50 11525.21
1981 1447.50 1380.50 1289.00 1038.50 774.00 571.50 315.50 275.00 506.50 989.00 1137.00 1525.50 11249.50
1982 1698.00 1541.00 1364.50 1277.00 897.50 589.50 358.00 256.78 a 599.50 992.50 1368.00 1579.50 12521.78
1983 1605.50 1382.50 1357.36 c 1151.50 883.00 597.00 380.00 248.00 a 619.00 879.50 1262.00 1833.50 12198.86
1984 0.00 z 1575.00 1384.50 1151.50 925.50 627.50 321.50 341.50 749.00 1141.00 1314.50 1818.50 11350.00
1985 1913.00 1748.00 1583.50 1063.50 772.50 565.00 327.50 511.00 806.50 1074.50 1475.00 1615.00 13455.00
1986 1511.50 1249.00 616.00 m 1052.59 a 932.50 0.00 z 405.00 332.22 a 723.00 927.00 1314.50 1585.50 10032.80
1987 1738.00 1338.50 1285.50 892.50 599.00 421.50 304.50 404.00 508.00 860.00 1188.50 857.50 n 9540.00
1988 1835.50 1500.50 1487.00 1028.50 723.00 333.00 219.50 336.00 670.00 759.00 1340.00 1656.50 11888.50
1989 1757.00 1614.50 1351.00 1072.50 475.50 l 504.50 221.00 387.00 629.00 928.40 b 1236.50 1581.50 11282.90
1990 1630.00 1500.00 1346.50 938.50 879.00 535.50 305.50 322.00 430.00 1008.00 1224.00 1913.50 12032.50
1991 1826.00 1306.50 1447.50 1113.00 890.50 523.00 286.50 275.50 584.50 966.00 1369.50 1649.50 12238.00
1992 1768.50 1352.50 1229.00 935.00 648.00 513.50 469.00 369.00 675.50 853.50 1382.50 1685.50 11881.50
1993 1769.50 1567.50 1325.00 1112.00 779.00 633.00 570.50 481.50 651.00 930.00 1454.00 1601.50 12874.50
1994 1550.50 1548.00 1346.50 1060.00 710.00 501.50 349.00 244.50 499.50 947.50 1520.50 1493.00 11770.50
1995 1717.00 1282.00 1402.00 1119.00 872.00 602.00 400.00 346.50 555.00 1036.00 1179.00 1566.50 12077.00
1996 1728.00 1565.50 1417.00 1095.50 932.00 491.50 292.90 b 364.00 670.00 940.50 1206.00 0.00 z 10702.90
1997 1146.00 j 1556.00 1399.50 1196.50 833.50 454.00 372.50 311.00 491.50 965.00 1264.00 1531.50 10375.00
1998 1455.00 1306.00 1329.00 1012.50 765.18 a 492.50 i 214.50 289.50 424.00 913.50 1219.00 1665.00 10593.18
1999 1535.50 1421.00 1375.00 1160.50 932.30 d 444.50 h 247.00 j 169.00 n 412.50 j 442.00 n 776.00 g 1538.00 7962.30
2000 1581.00 1330.00 1348.00 792.50 g 431.50 o 263.50 n 102.00 o 258.33 d 584.40 e 746.00 f 1495.50 1574.00 8171.23
2001 1713.00 1483.00 1284.00 1097.50 612.00 f 0.00 z 191.00 j 168.00 h 476.25 b 738.50 g 1125.54 b 1579.97 a 8759.25
2002 1703.50 1584.00 1488.50 1059.50 867.00 515.50 194.00 391.50 573.50 1066.00 917.50 i 1476.00 10919.00
2003 1419.00 1511.50 1312.50 1025.00 801.50 433.00 f 160.50 204.50 596.50 668.00 f 1047.50 h 1062.00 j 7031.00
2004 1645.50 1498.50 1222.50 584.50 k 708.00 f 570.00 268.50 i 428.50 628.20 e 929.00 701.00 k 1543.91 c 8466.11
2005 1490.00 0.00 z 715.50 n 1062.93 a 859.06 e 604.50 272.00 370.00 612.50 663.00 h 998.50 g 1611.50 6882.49
2006 0.00 z 1543.50 1393.34 c 960.52 a 800.04 e 436.07 b 144.50 j 0.00 z 0.00 z 0.00 z 0.00 z 0.00 z 5133.47
Period of Record Statistics
MEAN 1685.71 1457.35 1422.45 1089.43 819.25 536.81 312.75 340.01 589.07 914.26 1275.26 1582.52 12100.06
S.D. 149.88 126.68 112.72 87.15 88.05 80.67 79.70 77.80 91.13 83.57 117.27 119.85 511.68
SKEW 0.23 0.23 0.88 0.23 -0.17 -0.68 0.49 -0.08 0.38 0.22 0.04 0.62 0.83
MAX 2103.57 1761.00 1808.50 1314.00 977.50 701.00 570.50 511.00 806.50 1141.00 1520.50 1913.50 13455.00
MIN 1324.50 1237.00 1222.50 892.50 599.00 322.80 121.50 174.00 424.00 750.20 1006.50 1331.50 9999.00
NO YRS 54 55 53 51 50 45 52 54 48 48 49 52 25