ST MARY, MONTANA

Monthly Total Heating Degree Days

(247292)

Base Temperature = 65 F

File last updated on Apr 4, 2013
*** Note *** Provisional Data *** After Year/Month 201302
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
1981 0.00 z 0.00 z 0.00 z 0.00 z 520.50 388.50 163.27 a 38.20 c 314.00 703.00 836.50 1264.91 c 4228.87
1982 1814.65 d 1276.50 1168.00 910.00 560.07 a 285.00 141.50 98.50 393.50 658.50 1159.50 1249.00 9714.71
1983 1090.50 884.00 1003.76 b 781.00 508.50 273.50 141.00 48.50 430.00 587.50 995.17 a 1802.50 8545.93
1984 1179.50 889.00 1008.00 755.50 568.00 329.00 84.00 54.00 546.00 858.00 1063.33 c 1644.00 8978.33
1985 1342.30 a 1275.00 1057.50 718.00 420.00 297.00 39.50 200.50 653.79 a 769.50 1619.50 1236.00 9628.59
1986 940.50 1269.00 780.50 732.32 b 483.50 135.50 190.00 61.00 556.03 a 556.00 1147.50 1073.50 7925.36
1987 1163.50 917.50 1003.00 544.50 397.00 157.50 170.00 279.00 282.50 585.50 781.03 a 1195.50 7476.53
1988 1375.00 1089.50 976.00 651.50 412.50 159.00 108.00 92.00 324.00 509.00 974.00 1151.50 7822.00
1989 1242.00 1462.00 1132.00 745.00 537.50 262.50 76.50 211.00 347.50 674.00 987.50 1184.00 8861.50
1990 1207.00 1166.50 989.00 684.00 551.50 311.50 142.50 73.00 180.50 776.50 994.50 1584.00 8660.50
1991 1462.00 801.50 1100.50 744.00 541.00 242.50 j 64.50 58.00 305.00 726.50 1025.00 1032.30 a 7860.30
1992 1026.50 863.50 781.00 652.00 412.50 192.50 225.00 212.00 394.00 612.50 960.00 1556.50 7888.00
1993 1518.00 1215.50 917.08 a 672.50 346.00 302.50 328.00 225.50 400.50 437.50 k 1123.00 1043.00 8091.58
1994 1203.50 1345.00 875.00 677.50 401.50 251.50 94.00 109.61 c 188.00 688.50 1123.50 1194.50 8152.11
1995 1146.00 1032.50 1080.50 777.00 552.00 320.00 114.50 108.00 i 317.00 755.00 967.50 1241.00 8303.00
1996 1614.50 1120.00 1210.00 663.00 657.50 222.50 56.00 90.00 430.50 720.00 1338.00 1568.50 9690.50
1997 1429.00 991.00 1079.32 a 884.00 521.00 265.50 93.00 128.00 200.00 647.00 920.00 1096.50 8254.32
1998 1369.50 928.00 1070.50 665.50 410.00 0.00 z 23.50 126.58 a 208.97 a 582.00 976.50 1336.50 7697.55
1999 1220.62 c 956.67 d 892.69 d 749.46 b 539.06 d 336.21 a 204.17 b 38.20 c 391.07 b 652.72 d 762.41 a 1002.52 c 7745.80
2000 1290.63 a 1073.50 945.50 a 635.69 a 462.86 b 270.56 c 54.00 59.50 382.80 e 607.60 a 1106.79 b 1312.16 b 8201.58
2001 1068.50 1249.50 944.43 b 782.00 384.83 b 285.00 b 73.22 b 33.50 190.34 a 667.50 795.00 1198.67 a 7672.49
2002 1255.00 1026.00 1438.00 859.50 570.50 291.50 47.00 157.00 173.00 o 557.00 l 826.50 711.50 j 6471.00
2003 714.00 l 631.50 k 580.00 o 821.40 e 0.00 z 0.00 z 0.00 z 0.00 z 0.00 z 0.00 z 0.00 z 692.00 l 821.40
2004 1409.00 984.50 835.50 625.00 599.00 325.00 81.50 142.50 387.50 701.50 877.50 946.00 f 6968.50
2005 1438.00 1017.50 353.50 u 780.50 546.50 389.50 88.00 f 191.00 440.77 d 684.00 914.50 449.50 t 6402.27
2006 586.50 m 1110.08 d 560.50 p 338.00 o 164.50 u 185.00 g 0.00 z 77.00 k 0.00 z 327.50 o 408.00 q 340.00 v 1110.08
2007 775.50 l 942.50 f 353.00 s 474.50 m 289.50 l 183.00 f 19.00 133.00 179.00 l 556.00 f 810.00 g 787.00 l 152.00
2008 418.00 u 0.00 z 1059.37 e 414.00 p 580.06 e 371.00 0.00 z 0.00 z 0.00 z 637.80 d 833.00 1137.50 h 3481.22
2009 1179.00 f 389.00 r 935.50 g 905.00 445.00 f 293.50 g 82.50 i 164.50 f 125.00 n 758.00 f 901.00 1607.00 3413.00
2010 1292.00 1067.00 928.34 c 870.00 816.00 500.50 261.50 373.50 577.24 a 594.74 d 1140.00 g 1346.50 8627.32
2011 1440.95 c 0.00 z 1223.39 c 1064.48 a 707.32 a 382.20 e 171.03 b 134.33 a 304.00 730.57 a 1092.22 c 1206.93 a 8457.43
2012 1299.50 1240.50 1069.50 b 732.41 a 640.67 a 369.00 108.00 159.50 261.00 j 897.00 970.00 1341.00 8827.08
2013 1240.50 1047.00 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 2287.50
Period of Record Statistics
MEAN 1299.21 1085.12 1021.86 752.96 523.12 295.15 121.27 130.65 365.82 676.25 1002.53 1298.74 8451.14
S.D. 186.97 164.34 145.30 109.49 106.06 81.77 74.96 82.18 126.63 89.84 179.98 213.67 741.69
SKEW 0.57 0.35 0.66 0.73 0.60 0.08 0.92 1.07 0.42 0.54 1.50 0.73 0.58
MAX 1814.65 1462.00 1438.00 1064.48 816.00 500.50 328.00 373.50 653.79 897.00 1619.50 1802.50 9714.71
MIN 940.50 801.50 780.50 544.50 346.00 135.50 19.00 33.50 180.50 509.00 762.41 1002.52 7476.53
NO YRS 27 27 26 28 28 26 27 27 25 26 28 25 16