WEST YELLOWSTONE, MONTANA

Monthly Total Heating Degree Days

(248857)

Base Temperature = 65 F

File last updated on Jul 24, 2006
*** Note *** Provisional Data *** After Year/Month 199603
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
1924 1741.68 a 1342.50 1501.50 1015.00 713.50 494.50 293.00 362.00 540.58 d 884.05 c 1373.89 c 1879.24 b 12141.44
1925 1569.38 c 1211.58 d 995.50 f 500.00 l 510.50 f 107.50 p 194.00 336.00 514.66 a 962.00 1270.71 b 1369.34 b 7427.67
1926 1615.58 e 1204.58 d 1334.07 b 633.50 f 533.00 347.68 b 169.00 268.50 723.75 b 818.50 1065.00 1264.50 g 8079.66
1927 1609.02 e 969.00 i 1153.00 f 663.00 k 756.18 c 354.00 188.00 354.43 a 518.00 847.33 a 1079.00 1763.68 c 7469.64
1928 1127.00 g 930.00 l 1265.00 1157.31 d 537.50 516.21 a 205.24 b 392.50 525.00 b 861.59 b 1237.76 a 1716.50 8414.60
1929 1181.00 k 1610.00 c 1341.61 d 1052.78 c 822.65 d 448.50 227.00 168.50 553.50 g 971.16 b 1565.00 1504.50 9711.69
1930 2156.00 1040.50 f 1168.00 f 871.73 d 0.00 z 545.00 225.00 229.50 541.00 906.50 1416.00 1730.04 e 8620.77
1931 1572.70 c 1364.72 c 1026.50 j 938.50 372.00 o 0.00 z 202.02 a 259.00 293.50 n 882.97 b 1405.00 1648.00 8272.90
1932 1883.00 1459.00 1407.40 a 939.00 640.00 413.33 c 219.38 e 314.50 535.50 1009.57 a 1183.00 1876.00 11879.68
1933 1512.50 1692.50 1383.00 1036.00 792.00 304.82 b 102.09 b 274.87 a 520.00 721.02 b 1175.89 b 1292.00 10806.68
1934 1426.00 1135.50 1041.00 702.50 462.50 411.00 144.50 216.50 620.00 704.50 1059.00 1499.50 9422.50
1935 1500.00 1316.50 1312.50 1006.50 774.50 412.50 156.50 263.50 447.50 840.50 1321.50 1506.48 e 10858.48
1936 1601.00 1450.50 1029.50 h 864.50 524.50 265.50 49.50 191.50 524.48 a 848.00 1473.21 b 1602.59 c 9395.29
1937 1669.50 g 1088.50 g 1028.50 f 642.00 j 581.25 c 411.21 a 169.00 248.52 a 426.72 a 767.80 c 1130.19 d 1556.31 d 5291.01
1938 1260.50 g 987.50 f 980.50 f 936.72 a 707.00 348.50 221.00 257.00 370.00 788.00 1515.00 1537.50 6680.72
1939 1574.50 1578.50 1188.50 842.50 546.00 476.00 147.00 224.00 434.50 824.08 a 1117.00 1301.00 10253.58
1940 1567.00 1319.00 1194.00 872.50 550.00 323.50 158.00 183.00 414.00 770.00 1410.50 1498.00 10259.50
1941 1528.00 1241.00 1163.50 916.00 582.11 d 365.50 168.00 221.50 637.00 898.00 1212.00 1466.50 10399.11
1942 1701.50 1508.50 1339.50 840.50 758.00 466.00 139.50 193.00 508.00 862.50 1317.50 1478.00 11112.50
1943 1740.50 1392.00 1466.50 780.00 734.00 469.14 a 210.50 267.50 476.50 808.00 909.50 f 1589.00 9933.64
1944 1739.50 1373.36 a 1441.00 916.50 644.00 481.50 269.50 327.00 552.50 751.50 1299.50 1644.00 11439.86
1945 1491.00 1283.00 1239.00 1078.00 659.00 521.00 227.00 293.00 626.00 812.00 1246.00 1634.00 11109.00
1946 1667.50 1355.50 1149.00 803.50 732.00 396.50 157.00 252.50 559.50 1030.50 1241.79 b 1439.50 10784.79
1947 1724.50 1309.50 1188.85 a 601.00 l 0.00 z 308.50 l 187.00 292.50 484.00 751.50 1378.00 1549.00 8864.85
1948 1696.50 1468.50 0.00 z 625.50 i 617.93 a 324.31 a 214.93 a 256.50 493.00 843.00 1403.00 1711.00 9028.68
1949 2070.50 1425.41 a 1210.03 a 835.00 584.50 390.50 180.50 207.50 508.45 a 1000.50 1030.71 b 1310.50 f 9443.60
1950 1730.12 b 1284.00 1336.00 1018.00 799.00 429.50 275.00 298.00 530.50 762.50 1182.00 1356.50 11001.12
1951 1736.50 1276.50 1417.50 948.00 617.42 a 572.00 227.50 323.50 563.79 a 953.50 1360.00 1678.50 11674.71
1952 1637.00 1530.00 1430.00 853.50 634.50 386.50 252.50 228.50 407.50 751.00 1473.62 a 1492.98 c 11077.60
1953 1269.50 1379.50 1250.33 a 1074.50 814.00 443.50 100.50 197.00 401.90 a 753.82 a 1069.50 1606.50 10360.55
1954 1457.50 1187.50 1390.98 d 885.00 618.00 503.00 119.50 283.00 496.00 917.50 1060.00 1705.00 10622.98
1955 1735.00 1542.00 1572.50 1044.50 699.50 444.50 168.00 156.50 511.50 850.36 b 1428.50 1506.00 11658.86
1956 1473.50 1640.00 1355.50 890.00 531.50 317.50 164.00 310.50 458.00 849.00 1459.00 1537.50 10986.00
1957 1942.50 1207.50 1278.50 957.00 590.00 392.50 144.00 208.00 500.50 842.00 1401.50 1463.50 10927.50
1958 1587.50 1124.50 1295.50 972.00 441.00 338.00 265.50 156.50 539.00 799.50 1289.00 1417.50 10225.50
1959 1603.50 1341.00 1331.00 929.00 781.50 281.50 171.50 236.00 526.50 869.50 1360.00 1627.00 11058.00
1960 1674.00 1573.00 1225.50 890.00 693.50 338.50 86.50 297.50 445.00 876.00 1293.50 1686.50 11079.50
1961 1730.00 1222.00 1220.00 991.50 640.00 226.00 116.00 139.50 683.00 923.50 1375.50 1706.00 10973.00
1962 1865.50 1328.50 1336.50 912.50 639.50 358.00 240.50 295.00 486.50 707.50 1132.00 1490.50 10792.50
1963 1928.00 1127.00 1279.00 982.50 605.50 439.50 183.50 175.00 338.50 688.50 1156.50 1651.50 10555.00
1964 1722.50 1644.00 1489.00 995.00 661.50 443.00 102.00 326.50 571.50 817.50 1244.50 1600.00 11617.00
1965 1545.00 1437.00 1569.50 877.50 760.00 439.00 197.00 293.00 753.50 739.50 1067.50 1536.00 11214.50
1966 1634.00 1439.50 1311.00 983.50 562.00 400.00 76.00 255.50 403.50 942.00 1175.50 1609.50 10792.00
1967 1487.00 1370.50 1287.00 1052.00 719.50 416.00 126.00 142.00 396.50 856.00 1233.50 1803.50 10889.50
1968 1689.50 1264.00 1137.50 1040.50 711.50 412.50 97.00 343.00 550.50 871.00 1317.00 1669.50 11103.50
1969 1510.50 1333.00 1420.50 850.50 510.00 449.00 160.50 134.33 a 434.00 1040.00 1276.00 1562.00 10680.33
1970 1558.50 1249.50 1374.00 1159.50 687.00 328.00 132.00 113.00 651.50 1016.50 1234.50 1599.50 11103.50
1971 1586.00 1393.50 1421.50 993.00 672.00 368.00 198.50 91.00 672.00 946.50 1285.00 1658.00 11285.00
1972 1652.00 1372.00 1144.00 967.50 629.00 339.00 244.00 211.00 641.50 879.50 1257.00 1795.50 11132.00
1973 1769.50 1330.00 1312.00 1052.78 c 678.00 415.00 164.50 197.50 551.00 820.50 1192.50 1496.00 10979.28
1974 1610.00 439.00 s 1238.34 c 930.00 739.50 265.00 104.00 288.50 484.50 778.50 1195.86 a 1698.00 9332.20
1975 1693.00 1436.50 1317.00 1158.50 808.00 466.50 100.50 339.50 500.50 863.50 1358.50 1492.50 11534.50
1976 1541.00 1368.00 1439.50 943.00 604.50 415.00 119.00 285.00 460.00 909.00 582.50 q 1693.50 9777.50
1977 1774.50 1315.50 1409.35 d 814.66 a 702.00 204.50 162.00 262.50 533.50 841.43 c 1250.00 1449.50 10719.44
1978 1461.50 1250.50 1114.50 899.00 705.00 383.00 190.50 305.00 538.00 823.64 b 725.00 n 1219.00 l 7670.64
1979 1290.50 j 985.50 h 0.00 z 162.50 x 660.00 373.00 124.00 226.50 407.50 805.50 1481.00 1434.00 5511.50
1980 1694.15 a 0.00 z 605.00 p 220.50 x 638.00 418.50 180.00 369.50 501.50 880.00 1172.00 1362.50 7216.15
1981 1447.50 1272.00 1150.62 a 875.50 654.00 388.50 201.50 191.50 435.50 918.00 1134.50 1493.00 10162.12
1982 1670.00 1456.00 1236.00 1143.50 755.50 424.50 231.50 182.00 517.00 953.00 1459.50 1653.00 11681.50
1983 1479.00 1217.00 1159.50 1050.50 730.50 450.00 263.50 134.00 528.50 806.00 1202.50 1824.00 10845.00
1984 1656.50 1484.50 1244.00 1060.00 698.50 449.50 155.00 209.00 615.00 1024.55 a 1298.00 1749.50 11644.05
1985 1812.00 1573.00 1431.50 872.50 607.00 378.00 148.00 366.00 686.50 934.50 979.00 l 1637.00 10446.00
1986 1420.50 1207.00 1018.00 932.50 680.50 263.00 287.50 183.00 0.00 z 862.00 1265.69 a 1677.00 9796.69
1987 1667.50 1247.00 1176.50 778.50 530.00 328.50 252.00 328.50 446.50 834.50 1217.00 1601.50 10408.00
1988 1716.50 1375.00 1349.00 868.50 597.50 204.50 102.00 205.50 505.00 652.50 1243.50 1646.00 10465.50
1989 1636.00 1518.00 1162.00 699.00 i 669.00 372.00 75.00 253.00 521.00 830.00 1173.50 1619.00 9828.50
1990 1495.50 1394.50 1204.50 791.50 700.50 383.50 136.50 187.50 319.50 914.00 1239.00 1901.16 b 10667.66
1991 1662.78 b 0.00 z 0.00 z 0.00 z 0.00 z 0.00 z 0.00 z 135.00 464.00 928.50 1413.50 1696.00 6299.78
1992 1630.50 1225.50 1015.00 746.00 454.00 301.50 287.00 188.50 l 528.00 801.00 1412.50 1702.50 10103.50
1993 1043.50 m 717.00 o 1177.50 925.00 540.50 448.00 409.50 324.50 530.50 874.20 a 1474.50 1134.50 i 6704.20
1994 1461.13 a 1377.50 1191.00 851.00 482.00 140.50 o 144.50 132.00 365.50 896.50 1524.31 a 1514.35 a 9939.79
1995 1600.50 1224.50 1254.50 951.50 696.00 423.00 209.50 233.00 92.50 z 981.50 1113.00 1613.50 10300.50
1996 1721.50 1554.00 1324.50 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 4600.00
Period of Record Statistics
MEAN 1642.75 1367.20 1289.74 940.59 650.75 392.64 179.14 245.17 513.27 857.65 1277.62 1595.65 10941.87
S.D. 151.71 136.34 125.74 103.05 93.32 77.30 63.54 70.66 88.32 86.01 132.82 134.54 520.61
SKEW 0.76 0.38 0.04 0.17 -0.24 -0.32 0.63 -0.04 0.40 0.05 0.12 0.01 -0.16
MAX 2156.00 1692.50 1572.50 1159.50 822.65 572.00 409.50 392.50 753.50 1040.00 1565.00 1901.16 12141.44
MIN 1269.50 1124.50 1015.00 702.50 441.00 204.50 49.50 91.00 319.50 652.50 1030.71 1292.00 9422.50
NO YRS 67 63 62 62 67 67 71 71 68 72 68 68 45