SWAN FALLS POWER HOUSE, IDAHO

Monthly Total Growing Degree Days

(108928)

Base Temperature = 40 F

File last updated on Apr 4, 2013
*** Note *** Provisional Data *** After Year/Month 201303
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
1935 0.00 z 0.00 z 0.00 z 0.00 z 0.00 z 0.00 z 1216.75 a 1142.57 c 916.00 495.50 13.00 0.00 3783.82
1936 23.50 50.00 n 107.90 e 492.00 836.48 a 989.50 1328.57 c 1226.10 b 771.43 b 546.12 a 45.52 a 34.00 6401.12
1937 0.00 a 5.70 a 197.37 a 292.50 742.50 871.50 1315.50 1140.50 890.00 536.50 210.00 40.30 a 6242.37
1938 20.48 c 108.64 c 140.53 a 400.50 598.19 d 907.50 b 1215.95 b 1132.02 a 969.31 a 490.32 a 55.50 13.50 6052.43
1939 9.00 4.50 254.00 500.50 773.50 808.50 1253.00 1232.50 829.50 479.50 110.00 103.00 6357.50
1940 16.50 87.00 262.00 403.50 793.00 1083.50 1282.37 a 1241.50 816.00 520.50 55.50 42.00 6603.37
1941 8.50 62.74 a 262.98 a 388.50 696.50 820.00 1263.25 a 1103.50 695.50 443.50 174.64 b 71.00 5990.62
1942 3.00 14.00 86.80 a 457.50 524.50 746.00 1276.17 a 1168.00 836.00 525.00 102.50 8.00 5747.47
1943 26.00 34.00 136.50 529.50 584.72 b 738.00 1138.73 a 1116.50 905.00 508.50 68.00 15.00 5800.46
1944 0.00 16.50 95.00 342.50 704.50 700.86 a 1131.00 1103.50 813.50 616.50 79.00 1.03 a 5603.90
1945 5.17 d 35.78 a 121.93 a 277.50 635.50 759.31 a 1234.83 a 1165.60 a 704.00 572.00 135.50 46.50 5693.62
1946 19.00 28.50 219.50 501.11 c 720.75 c 918.50 1250.50 1157.50 726.00 292.00 59.50 82.50 5975.36
1947 10.85 a 67.50 270.50 421.00 824.50 768.50 1270.50 1134.00 784.00 535.78 a 89.00 7.00 6183.13
1948 0.00 z 0.00 z 0.00 z 0.00 z 0.00 z 0.00 z 0.00 z 1087.00 776.50 502.50 80.50 9.62 b 2456.12
1949 0.00 39.00 198.18 c 540.52 a 792.10 b 916.50 1242.00 1186.00 899.00 332.00 224.00 19.50 6388.80
1950 10.00 77.50 141.50 386.00 618.97 a 868.00 1221.00 1172.50 838.50 617.50 193.50 29.50 6174.47
1951 27.50 68.96 a 116.00 477.50 681.00 857.50 1287.00 1146.00 853.50 429.50 102.50 19.00 6065.96
1952 0.00 11.00 89.50 520.50 721.50 889.50 1221.50 1223.50 916.00 645.50 63.50 16.00 6318.00
1953 183.50 92.50 257.00 363.50 554.00 767.50 1291.50 1182.65 a 940.50 574.00 284.48 a 13.50 6504.63
1954 87.50 120.50 153.50 492.50 812.00 791.00 1279.27 a 1051.50 835.71 b 475.50 222.32 b 25.00 6346.30
1955 2.50 5.50 104.00 294.11 b 647.26 b 955.34 a 1155.00 1268.70 d 884.46 b 548.91 b 127.50 80.00 6073.29
1956 31.00 43.50 201.00 g 482.00 760.57 b 925.00 1253.00 1111.50 875.50 447.50 86.00 39.86 c 6055.43
1957 0.00 68.00 237.84 b 390.52 a 703.50 966.72 a 1233.50 1142.50 910.00 431.00 82.50 60.00 6226.09
1958 20.00 152.50 165.00 362.50 923.00 950.00 1224.50 1279.50 844.50 599.50 169.00 21.00 6711.00
1959 79.50 65.50 197.00 513.50 576.00 1055.00 1316.50 1142.50 738.50 497.50 106.00 2.50 6290.00
1960 0.00 17.50 269.50 461.50 655.00 1052.50 1400.50 1085.00 941.00 470.50 131.50 18.50 6503.00
1961 18.00 121.50 251.00 414.00 749.50 1160.00 1326.50 1310.50 683.00 446.92 a 95.00 33.50 6609.42
1962 18.50 44.00 134.50 561.50 645.50 927.00 1168.00 1126.50 885.00 503.00 193.50 38.50 6245.50
1963 3.00 178.50 237.50 341.50 778.50 842.00 1168.50 1191.50 973.50 633.50 166.50 0.00 6514.50
1964 9.50 1.00 93.00 358.97 a 673.00 830.00 1272.00 1110.00 772.00 560.50 122.50 95.00 5897.47
1965 43.50 98.50 165.50 473.50 634.00 896.00 1187.00 1075.00 664.00 602.50 246.50 23.00 6109.00
1966 55.50 39.50 265.50 461.50 843.00 907.00 1234.00 1189.00 953.50 461.00 209.00 33.00 6651.50
1967 88.50 104.50 220.50 261.50 706.00 906.00 1352.50 1319.00 993.62 a 489.00 170.50 20.00 6631.62
1968 2.00 150.00 322.50 373.50 701.00 985.50 1291.50 1002.50 815.00 492.00 103.00 45.00 6283.50
1969 28.50 5.50 182.00 486.50 850.50 932.00 1239.50 1221.00 879.50 340.50 138.50 29.00 6333.00
1970 96.50 114.50 168.00 260.00 698.00 977.50 967.00 g 1259.00 685.50 372.00 170.00 34.50 4835.50
1971 62.00 92.50 170.00 391.50 741.50 868.50 1216.50 1320.00 700.50 425.00 74.50 11.50 6074.00
1972 34.00 86.50 287.50 364.50 754.00 961.50 1190.00 1201.50 681.00 480.00 96.50 37.50 6174.50
1973 9.00 58.00 202.00 403.97 a 801.50 975.50 1264.00 1187.00 791.00 502.00 172.00 43.50 6409.47
1974 72.00 42.00 a 205.50 406.50 661.50 1101.72 a 1203.00 1153.50 919.62 d 502.50 141.00 f 20.50 6288.34
1975 12.50 56.50 180.00 237.50 645.00 874.50 1314.50 1079.50 882.50 507.50 145.50 44.00 5979.50
1976 8.50 78.50 140.50 388.00 813.00 885.50 1252.00 1008.50 847.50 478.00 172.00 0.00 6072.00
1977 0.00 70.50 161.50 599.00 592.00 1086.00 1197.50 1191.00 804.00 491.00 133.00 53.22 a 6378.72
1978 59.50 82.00 374.00 390.58 d 618.00 927.50 1195.00 1149.50 788.00 546.00 97.50 15.00 6242.58
1979 0.00 51.00 260.00 398.00 751.50 999.00 1269.50 1147.00 952.50 571.00 64.00 30.00 j 6463.50
1980 49.00 113.50 200.00 548.00 679.50 839.00 1215.00 1085.50 811.00 486.00 148.00 53.00 6227.50
1981 19.00 79.00 253.00 442.00 630.00 887.00 1198.50 1264.50 889.00 392.50 227.50 81.00 6363.00
1982 8.50 68.50 178.00 302.00 670.50 952.50 1098.50 1182.00 0.00 z 451.00 63.00 38.00 5012.50
1983 23.00 143.00 258.00 311.00 670.00 893.50 1112.00 1222.50 816.50 505.00 194.50 10.00 6159.00
1984 0.50 6.00 199.50 353.50 625.00 763.00 1243.50 1255.00 744.00 350.50 111.50 0.00 c 5652.00
1985 0.00 7.00 100.00 565.00 790.50 735.50 i 1385.50 1109.00 646.50 408.50 79.50 4.00 5095.50
1986 26.50 169.50 390.50 408.50 733.00 1126.00 1127.50 1291.00 683.00 502.00 152.78 c 3.00 6613.28
1987 14.50 45.00 264.50 0.00 z 856.00 1048.50 1119.00 1114.00 877.00 573.00 155.50 68.50 6135.50
1988 9.00 114.00 263.00 534.50 710.00 1048.50 1259.50 1071.50 785.50 750.50 154.50 0.50 6701.00
1989 0.00 17.00 276.00 553.50 688.50 1033.00 1309.00 1088.00 858.00 471.50 107.50 5.50 6407.50
1990 44.50 60.00 298.00 614.50 634.00 946.00 1254.00 1167.00 1002.00 483.50 114.00 3.00 6620.50
1991 6.00 136.00 250.00 382.50 609.50 851.00 1263.50 1274.50 876.50 497.00 44.00 10.00 6200.50
1992 39.00 133.00 361.50 563.50 885.05 a 978.50 1063.50 1233.00 840.50 582.50 63.50 2.00 6745.55
1993 4.00 17.00 198.00 385.00 837.00 807.50 932.50 1020.00 846.50 516.50 41.00 32.00 5637.00
1994 7.00 62.50 351.50 496.50 811.50 996.00 1311.50 1253.50 925.00 463.00 33.00 12.00 6723.00
1995 59.00 171.00 233.50 394.00 662.50 839.50 1185.00 1079.00 884.00 243.00 l 224.00 61.50 5793.00
1996 8.00 79.00 231.50 383.00 597.00 918.00 1225.50 1123.50 733.00 468.00 133.50 77.00 5977.00
1997 25.50 40.00 0.00 z 349.50 775.50 881.00 1129.00 1172.00 889.66 a 446.50 124.50 4.50 5837.66
1998 74.50 78.00 227.50 366.50 606.00 0.00 z 0.00 z 1232.00 951.00 461.00 164.00 40.00 4200.50
1999 12.50 39.00 183.00 325.50 570.83 b 880.50 1135.12 a 1172.50 794.50 501.88 b 253.00 13.00 5881.32
2000 35.50 97.50 205.00 541.50 714.50 970.50 1213.28 b 1197.12 a 744.44 c 0.00 z 401.00 1.07 b 6121.41
2001 0.00 29.50 306.50 347.50 804.97 a 957.12 d 1156.96 c 1266.50 928.89 c 479.43 b 207.50 13.00 6497.87
2002 11.50 27.50 170.00 449.50 716.00 1008.62 a 1321.00 863.00 f 819.50 399.38 a 125.00 55.00 5103.00
2003 56.00 59.50 297.50 387.50 722.00 1000.50 1352.00 1225.50 843.00 622.50 80.00 56.00 6702.00
2004 2.50 39.00 372.50 497.00 678.00 948.50 1250.00 1165.08 a 767.00 488.50 52.76 a 41.50 6302.34
2005 7.00 50.00 283.00 391.00 680.50 796.50 1242.50 1212.88 c 740.50 478.00 69.50 18.50 5969.88
2006 34.00 50.00 169.00 436.50 723.00 1018.50 1350.50 1120.00 785.00 436.50 164.00 37.00 6324.00
2007 6.00 90.50 0.00 z 401.50 776.00 946.67 c 1388.50 1174.38 a 760.00 382.50 113.00 25.00 6064.05
2008 7.00 33.00 102.50 261.00 661.50 896.79 b 1215.50 1157.00 787.00 443.00 170.00 25.50 5759.79
2009 8.50 29.04 a 158.00 355.71 b 727.98 a 865.50 1208.00 1091.00 960.00 314.65 a 104.00 0.00 5822.38
2010 20.00 59.50 175.00 301.55 a 475.33 a 818.00 1166.12 a 760.00 j 620.00 g 553.50 147.00 9.00 3725.00
2011 16.02 a 23.52 c 163.30 c 269.46 b 512.53 a 791.38 a 1135.63 a 1192.98 a 927.41 a 478.00 76.03 a 21.18 a 5607.47
2012 19.93 c 55.21 c 229.40 a 495.00 c 630.85 a 853.50 1287.50 1228.38 c 858.50 435.03 a 165.50 58.90 a 6317.70
2013 4.50 16.50 180.66 b 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 201.66
Period of Record Statistics
MEAN 24.19 65.00 211.28 417.02 702.65 915.00 1233.32 1168.75 833.63 491.56 131.23 29.54 6224.09
S.D. 30.34 44.33 73.31 89.81 91.25 97.87 79.60 72.41 86.93 79.20 66.45 25.04 313.05
SKEW 2.50 0.68 0.35 0.12 0.00 0.17 -0.62 -0.01 -0.19 0.16 1.04 0.91 -0.24
MAX 183.50 178.50 390.50 614.50 923.00 1160.00 1400.50 1320.00 1002.00 750.50 401.00 103.00 6745.55
MIN 0.00 1.00 86.80 237.50 475.33 700.86 932.50 1002.50 646.50 292.00 13.00 0.00 5603.90
NO YRS 77 76 74 75 76 74 75 76 76 76 77 77 61