MOUNT SPOKANE SUMMIT, WASHINGTON

Monthly Total Heating Degree Days

(455674)

Base Temperature = 65 F

File last updated on Jul 25, 2006
*** Note *** Provisional Data *** After Year/Month 197212
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
1953 0.00 z 0.00 z 0.00 z 0.00 z 0.00 z 0.00 z 208.00 264.50 417.50 693.00 1021.00 1287.50 3891.50
1954 1473.50 319.50 r 1310.50 748.00 i 274.50 s 624.00 315.50 385.50 576.50 881.50 944.00 1297.00 7808.00
1955 1440.97 b 1368.35 e 1497.30 a 675.50 l 922.50 500.50 378.50 236.50 500.17 a 876.02 b 789.00 o 1149.00 g 7720.80
1956 1037.00 f 889.00 k 1275.65 a 816.72 a 582.50 566.00 174.50 f 323.36 b 455.19 d 999.15 e 1107.50 955.00 h 6126.08
1957 1651.02 b 1235.77 b 1164.64 b 881.50 391.00 g 404.50 163.50 245.50 f 347.59 a 929.00 1144.82 b 1242.14 b 9164.47
1958 1235.02 c 633.00 j 482.50 t 787.00 f 427.00 400.20 e 110.16 c 110.00 475.18 b 704.98 b 832.00 i 1194.65 d 4657.19
1959 1393.21 e 1221.23 b 1223.50 907.24 a 850.00 461.50 206.00 g 400.00 662.78 c 861.00 1242.41 a 1272.55 a 10495.42
1960 1469.50 1271.50 1137.00 980.00 855.50 480.00 b 77.00 429.00 435.00 a 816.50 1148.79 a 1261.00 10360.79
1961 1196.00 1080.07 a 1171.50 1010.00 727.50 244.66 a 133.50 132.02 b 624.50 889.00 1241.00 1444.50 9894.25
1962 1476.00 1214.50 1266.00 469.00 n 851.43 b 488.28 a 336.87 a 375.00 460.86 a 790.50 1042.76 a 1252.40 a 9554.59
1963 1651.50 984.67 a 1187.00 1014.00 666.50 496.80 e 353.50 224.50 283.00 749.00 1136.38 a 1333.50 10080.35
1964 1411.00 1254.50 1290.12 a 1034.50 735.06 e 511.50 237.00 261.50 j 416.00 i 532.00 i 686.50 m 1034.50 i 6473.67
1965 1244.28 b 1185.50 1312.00 897.50 765.50 491.00 185.50 0.00 z 0.00 z 453.50 j 1064.50 0.00 z 7145.78
1966 0.00 z 1195.00 1150.50 954.00 596.50 587.14 b 330.31 b 308.40 b 290.40 e 887.50 1121.00 1256.50 8677.25
1967 992.50 g 1143.50 885.50 j 1129.29 b 744.50 395.77 d 113.00 i 86.69 d 208.85 d 877.30 a 1115.17 a 1437.50 7138.56
1968 1449.77 a 1059.50 1087.00 1085.50 760.50 526.50 209.00 403.50 545.50 988.00 1217.00 1211.00 h 9331.77
1969 1618.72 a 1292.00 1235.50 944.50 618.50 379.00 309.00 292.00 521.00 981.00 1046.50 1299.93 a 10537.65
1970 1462.00 1082.50 1284.00 1189.00 722.50 346.00 231.00 127.00 672.50 910.50 1170.00 1480.50 10677.50
1971 1427.50 1220.00 1404.00 1002.50 647.50 618.00 274.50 127.50 683.00 971.50 1198.50 1527.50 11102.00
1972 1652.00 1285.00 1164.00 1143.50 701.00 531.50 278.48 a 167.00 716.50 839.50 1167.00 1592.50 11237.98
Period of Record Statistics
MEAN 1453.25 1193.35 1244.72 999.32 716.15 476.47 243.02 258.38 493.11 869.16 1125.20 1345.31 10555.79
S.D. 143.82 100.49 103.24 104.94 121.62 96.66 89.53 117.18 148.29 91.59 81.61 119.84 496.77
SKEW -0.21 -0.44 0.78 0.18 -0.47 -0.54 -0.26 -0.03 -0.24 -0.44 -0.46 0.77 0.11
MAX 1652.00 1368.35 1497.30 1189.00 922.50 624.00 378.50 429.00 716.50 999.15 1242.41 1592.50 11237.98
MIN 1196.00 984.67 1087.00 816.72 427.00 244.66 77.00 86.69 208.85 693.00 944.00 1194.65 9894.25
NO YRS 16 16 17 15 17 19 17 17 18 18 17 15 7