OLD FAITHFUL, WYOMING

Monthly Total Heating Degree Days

(486845)

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
1978 0.00 z 0.00 z 0.00 z 0.00 z 0.00 z 0.00 z 0.00 z 0.00 z 416.50 i 888.31 b 1311.50 1923.50 4123.31
1979 1949.50 1335.50 1324.50 1078.50 786.00 507.50 280.55 a 366.50 505.50 888.00 1488.50 1463.50 11974.05
1980 1683.00 1273.00 1405.85 a 1009.00 761.10 b 510.54 b 287.50 457.77 a 592.50 b 1001.54 e 1254.00 1401.50 11637.29
1981 1458.50 1350.00 1256.50 977.31 d 598.00 h 544.66 a 0.00 z 308.50 541.50 969.94 e 1141.03 a 1522.50 10070.44
1982 1670.90 a 1512.52 a 1318.02 a 779.00 j 0.00 z 521.90 a 315.54 c 318.35 e 298.50 q 1005.84 c 1442.50 1587.41 b 9692.97
1983 1475.50 1269.50 1222.50 0.00 z 653.50 f 550.00 348.50 261.78 d 601.00 0.00 z 0.00 z 0.00 z 5728.78
1984 0.00 z 0.00 z 1293.50 594.00 m 835.50 370.50 j 194.50 248.50 0.00 z 0.00 z 1356.00 1763.50 5691.50
1985 0.00 z 1667.04 a 1455.00 943.50 680.00 468.46 d 229.00 423.50 576.50 g 987.00 1441.50 1638.50 9933.50
1986 1484.00 1253.00 1126.50 957.50 818.50 371.25 b 364.50 296.00 695.89 b 909.00 1348.00 1640.50 11264.64
1987 1664.50 1291.00 1269.00 842.50 597.00 430.86 a 330.00 420.50 517.00 858.00 1133.50 1541.00 10894.86
1988 1646.00 1294.00 1268.50 915.00 687.00 277.00 169.39 c 296.50 559.50 702.50 1293.50 1614.50 10723.39
1989 1569.50 1429.00 1081.50 972.41 a 717.50 477.00 150.50 331.00 557.50 874.00 1191.00 1678.00 11028.91
1990 1520.50 1454.50 1262.00 861.00 801.50 463.50 230.00 268.50 399.00 984.50 1212.50 1961.50 11419.00
1991 1674.00 1157.50 1290.50 1014.00 769.50 433.00 255.00 207.50 541.50 963.50 1408.50 1629.00 11343.50
1992 1583.00 1190.00 1033.50 819.31 a 565.50 430.00 390.00 328.50 615.00 825.50 1413.50 1714.00 10907.81
1993 1669.50 1417.00 1153.50 991.50 629.00 531.50 468.00 397.00 594.00 917.60 a 1468.00 1595.50 11832.10
1994 1462.50 1394.50 1187.00 938.00 565.00 425.00 263.00 214.00 467.50 940.00 1549.50 1480.50 10886.50
1995 1526.50 1149.00 1245.50 996.50 780.50 497.00 275.00 294.00 549.50 961.50 1171.00 1551.00 10997.00
1996 1629.00 1465.50 1325.50 1045.50 819.00 385.00 252.00 329.50 659.00 0.00 z 1235.00 1533.50 10678.50
1997 1649.50 1489.50 1305.00 1166.50 723.50 373.00 302.50 297.00 495.00 920.00 1263.50 1679.68 a 11664.68
1998 1422.50 1306.50 1313.50 1003.00 699.50 594.00 159.00 241.50 406.00 892.50 1162.00 1595.98 a 10795.98
1999 1510.00 1360.00 1338.00 1086.00 822.50 505.50 303.00 231.00 644.00 858.00 1035.00 1544.50 11237.50
2000 1544.00 1257.50 1300.50 890.50 694.00 450.50 230.50 242.50 618.50 874.50 1526.00 1626.50 11255.50
2001 1643.50 1405.50 1210.00 988.50 671.31 b 445.00 208.98 b 0.00 z 476.90 a 0.00 z 1042.24 a 1610.50 9702.43
2002 1622.00 1523.50 1429.00 979.00 732.00 424.00 153.50 376.00 539.50 1058.50 1312.00 1524.50 11673.50
2003 1362.00 1471.62 b 1242.00 955.00 0.00 z 0.00 z 157.50 208.50 592.00 772.93 a 1448.33 c 1466.00 9675.88
2004 1569.00 1470.00 1123.50 856.50 751.50 467.00 259.00 367.50 590.50 882.35 d 1229.00 1447.00 11012.85
2005 1418.50 1400.00 1266.00 1008.00 0.00 z 521.00 226.50 321.00 581.50 818.00 1278.00 1600.00 10438.50
2006 1507.50 1470.50 1362.97 a 891.00 667.53 a 391.61 b 104.00 l 0.00 z 0.00 z 0.00 z 0.00 z 0.00 z 6291.11
Period of Record Statistics
MEAN 1573.65 1372.49 1264.62 967.42 720.63 461.38 261.67 309.73 555.82 906.40 1302.04 1604.97 11252.73
S.D. 120.16 122.69 99.12 81.25 80.77 69.01 78.74 69.53 73.14 80.32 142.48 128.72 378.05
SKEW 0.88 0.08 -0.37 0.23 -0.43 -0.49 0.59 0.35 -0.40 -0.46 -0.06 1.14 0.40
MAX 1949.50 1667.04 1455.00 1166.50 835.50 594.00 468.00 457.77 695.89 1058.50 1549.50 1961.50 11974.05
MIN 1362.00 1149.00 1033.50 819.31 565.00 277.00 150.50 207.50 399.00 702.50 1035.00 1401.50 9999.00
NO YRS 26 27 28 25 23 26 26 26 24 24 27 27 18