GRAND RAPIDS FRS LAB, MINNESOTA

Monthly Total Heating Degree Days

(213303)

Base Temperature = 65 F

File last updated on Apr 6, 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
1915 0.00 z 0.00 z 0.00 z 0.00 z 0.00 z 273.21 b 133.00 149.00 323.28 a 659.00 1139.00 1516.50 4192.99
1916 2136.50 1788.00 1476.00 806.50 470.17 a 198.00 7.50 108.00 353.00 752.50 1153.50 1942.00 11191.67
1917 2110.00 1927.00 1361.50 835.50 473.50 216.72 a 61.50 153.50 345.50 1053.00 994.50 2012.93 a 11545.16
1918 1625.50 g 1639.00 1105.00 896.00 505.00 144.50 72.00 71.50 538.97 a 690.00 1012.00 1395.50 8069.47
1919 1575.00 1528.00 1306.50 754.00 381.50 58.00 23.50 89.00 268.00 810.00 1373.00 1931.50 10098.00
1920 1988.50 1590.00 1240.50 1034.50 370.00 119.50 60.50 81.50 178.00 486.00 1168.00 1492.50 9809.50
1921 1595.00 1284.50 1223.00 617.00 335.00 89.00 4.00 59.50 230.50 582.00 1310.50 1615.50 8945.50
1922 1806.00 1665.50 1144.00 730.00 183.50 47.00 40.50 55.80 a 223.00 576.08 a 932.00 1714.50 9117.88
1923 1713.00 1689.50 1553.00 781.00 361.50 48.50 11.00 151.00 282.50 690.50 906.00 1328.00 9515.50
1924 2022.50 1376.50 1200.50 802.00 642.00 187.50 68.50 146.50 377.50 481.50 1177.00 1958.00 10440.00
1925 1811.50 1420.00 1104.00 537.00 437.00 148.00 69.00 37.50 252.50 976.00 1102.00 1666.50 9561.00
1926 1679.00 1338.50 1365.00 753.00 272.50 198.50 30.00 50.00 404.48 a 727.00 1333.00 1778.00 9928.98
1927 1829.50 1403.00 1100.50 709.50 489.00 164.50 65.00 156.03 a 258.75 b 584.00 1298.79 a 1947.00 10005.58
1928 1786.00 1518.50 1309.50 917.07 a 297.00 204.00 27.50 92.00 369.83 a 639.50 990.52 a 1395.00 9546.41
1929 2218.00 1696.00 1158.00 735.50 546.00 210.00 57.50 99.00 395.50 643.00 1245.50 1684.00 10688.00
1930 2070.50 1311.33 a 1262.45 b 725.69 a 389.00 104.48 a 45.00 57.00 302.00 710.00 1078.39 b 1482.32 a 9538.16
1931 1507.50 1164.07 a 1221.40 a 667.00 424.50 104.00 51.50 114.00 187.50 463.00 915.50 1267.79 b 8087.77
1932 1584.50 1540.00 1522.50 728.00 350.00 33.50 62.00 a 63.00 313.50 756.00 1218.00 1696.00 9867.00
1933 1592.00 1697.50 1321.50 782.07 a 338.50 45.50 16.02 a 88.87 a 178.00 806.00 1292.59 a 1824.00 9982.54
1934 1604.00 1567.50 1407.50 765.50 225.27 a 102.00 54.50 144.50 360.50 541.98 a 948.00 1777.50 9498.75
1935 1962.50 1286.50 1258.00 848.50 492.00 214.00 1.00 104.50 359.00 678.38 a 404.50 u 1616.65 a 8821.03
1936 2090.50 2065.00 1289.00 954.50 256.78 a 166.00 24.50 82.50 236.00 824.50 1282.50 1582.00 10853.78
1937 2093.00 1594.50 1412.00 841.03 a 340.00 143.00 42.37 a 24.50 295.50 778.62 a 1150.86 a 1690.50 10405.88
1938 1836.00 1374.00 983.00 390.50 u 444.00 126.50 36.50 33.00 279.50 511.50 1223.50 1609.00 8456.50
1939 1671.00 1771.54 b 1384.50 841.00 296.50 118.00 33.21 c 50.00 303.50 708.50 970.50 1276.00 9424.25
1940 1903.40 a 1450.00 1457.50 821.90 a 422.50 168.50 57.50 132.00 219.50 552.50 1262.50 1526.00 9973.80
1941 1705.00 1510.50 1341.78 a 529.00 248.00 131.00 36.50 114.38 b 261.00 606.50 1050.00 1419.00 8952.66
1942 1552.00 1472.00 1085.50 535.00 468.50 162.93 a 90.00 75.95 a 399.00 650.50 1186.00 1764.33 b 9441.71
1943 1974.50 1483.00 1521.50 782.50 465.50 135.50 14.50 62.52 a 378.00 629.00 1246.50 1523.50 10216.52
1944 1423.50 1568.50 1379.00 825.50 343.00 119.00 40.50 96.50 308.50 614.32 a 979.00 1611.00 9308.32
1945 1794.50 1497.00 1010.60 a 855.50 616.90 a 285.50 92.00 79.00 374.50 706.00 1194.00 1728.50 10234.00
1946 1752.50 1593.00 910.50 642.50 464.00 164.50 54.00 130.20 a 333.00 673.00 1136.50 1655.00 9508.70
1947 1629.50 1605.50 1363.00 860.00 538.50 198.00 52.00 36.50 352.00 373.55 a 1268.50 1630.00 9907.05
1948 1899.50 1640.50 1259.63 a 639.50 380.00 144.50 36.00 50.50 182.50 582.00 1066.00 1612.00 9492.63
1949 1690.50 1633.00 1347.00 636.00 340.50 81.50 34.50 53.22 a 346.00 600.00 996.00 1651.00 9409.22
1950 2052.00 1495.00 1448.00 1027.50 484.00 145.00 61.00 172.50 234.00 580.22 a 1247.00 1797.00 10743.22
1951 1872.00 1473.50 1411.50 813.50 253.50 176.50 54.77 a 134.52 c 381.00 684.50 1294.50 1708.50 10258.29
1952 1804.50 1286.50 1326.50 591.00 374.50 74.00 39.00 104.88 a 280.00 782.00 1026.00 1390.00 9078.88
1953 1690.50 1460.00 1194.50 824.50 428.00 117.00 64.00 39.00 319.66 a 444.50 929.00 1570.00 9080.66
1954 1966.00 1116.50 1358.00 802.00 539.00 113.00 42.50 85.50 312.50 673.50 949.50 1404.00 9362.00
1955 1744.00 1569.00 1500.00 522.50 266.00 102.50 13.50 33.07 a 329.00 604.00 1340.50 1824.87 a 9848.93
1956 1673.00 1618.50 1389.50 878.00 450.00 84.00 107.00 103.50 387.93 a 429.00 1026.50 1540.50 9687.43
1957 1986.00 1482.50 1294.50 746.00 373.50 135.50 9.00 84.00 353.00 643.00 1069.00 1468.00 9644.00
1958 1518.00 1504.00 1111.00 641.00 360.50 288.00 76.50 99.00 271.50 573.50 1057.50 1836.00 9336.50
1959 1955.58 a 1534.00 1188.00 718.50 334.50 107.50 45.50 41.50 282.00 761.00 1390.86 a 1295.00 9653.95
1960 1715.50 1497.00 1474.00 745.00 377.00 164.00 52.50 38.50 298.00 600.00 1018.00 1655.00 9634.50
1961 1799.00 1212.00 982.00 883.50 428.50 93.00 34.50 29.00 311.00 569.00 1085.00 1607.50 9034.00
1962 1911.00 1549.50 1168.50 808.50 313.00 141.00 83.00 66.00 333.00 534.50 942.50 1543.50 9394.00
1963 1998.50 1600.50 1095.00 657.00 429.00 96.50 19.50 74.00 199.50 301.50 923.50 1780.50 9175.00
1964 1526.00 1412.00 1348.00 697.50 263.00 164.00 24.00 174.50 343.00 626.00 1036.00 1777.50 9391.50
1965 1901.50 1642.50 1537.00 750.50 326.00 135.00 63.50 112.00 506.00 592.50 1126.00 1338.50 10031.00
1966 2148.50 1532.50 1096.50 851.00 475.00 127.00 12.50 111.00 310.00 655.50 1208.00 1619.50 10147.00
1967 1734.00 1705.00 1241.00 775.00 546.50 128.50 66.00 120.50 240.50 688.00 1145.00 1542.50 9932.50
1968 1774.50 1608.00 1000.00 672.00 436.00 133.50 74.00 89.50 256.50 555.50 1070.00 1676.00 9345.50
1969 1859.50 1407.00 1324.50 642.50 374.00 285.00 52.00 19.00 265.00 773.00 1092.50 1465.00 9559.00
1970 1921.50 1501.50 1416.50 779.00 440.50 72.50 19.00 48.00 269.50 603.50 1138.50 1714.50 9924.50
1971 2033.00 1446.00 1269.50 705.50 426.00 55.50 86.00 101.00 283.50 504.50 1110.50 1600.00 9621.00
1972 2013.50 1701.50 1334.00 828.00 256.00 100.50 61.00 99.50 380.50 744.00 1169.50 1829.50 10517.50
1973 1649.50 1396.00 910.00 720.00 380.00 83.50 45.50 38.50 334.50 489.00 1098.00 1624.00 8768.50
1974 1825.00 1471.50 1326.50 703.00 486.50 110.00 10.00 109.50 395.00 589.00 1039.00 1384.50 9449.50
1975 1685.00 1432.00 1398.00 910.00 257.00 142.50 21.50 59.50 348.00 531.00 1027.50 1652.50 9464.50
1976 1839.50 1248.00 1268.00 539.00 330.50 49.00 19.00 64.00 276.50 806.00 1273.50 1887.00 9600.00
1977 2071.50 1342.00 967.00 508.50 113.00 74.00 22.00 155.50 292.00 592.00 1123.00 1696.00 8956.50
1978 1919.00 1593.50 1223.00 712.50 258.50 120.00 47.50 64.00 222.50 588.00 1180.50 1780.50 9709.50
1979 2077.50 1657.00 1237.50 837.00 486.00 139.50 25.00 108.00 237.50 688.50 1114.00 1364.00 9971.50
1980 1772.50 1546.50 1357.00 576.00 214.00 100.50 13.00 38.50 321.00 735.00 1011.00 1649.00 9334.00
1981 1624.00 1253.50 976.00 632.50 321.00 101.50 31.00 23.00 283.00 668.00 871.00 1577.50 8362.00
1982 2139.00 1497.50 1292.50 792.00 232.00 201.00 14.00 101.00 282.50 560.00 1165.50 1375.00 9652.00
1983 1630.50 1290.00 1105.00 780.50 475.50 138.00 17.50 8.00 303.50 655.00 1064.00 2062.00 9529.50
1984 1835.50 1201.50 1388.50 614.00 440.00 77.00 32.50 26.00 422.50 567.50 1129.50 1699.83 a 9434.33
1985 1887.00 1613.50 1046.50 626.00 255.00 231.00 32.50 133.00 343.00 698.50 1386.00 1970.50 10222.50
1986 1699.50 1541.56 a 1156.50 601.50 345.50 131.00 28.00 145.00 341.00 648.50 1257.50 1481.00 9376.56
1987 1581.00 1108.00 1028.00 490.50 306.50 76.50 26.50 95.00 249.00 775.00 973.50 1387.50 8097.00
1988 1941.50 1755.50 1241.00 724.00 190.50 67.00 18.00 70.50 261.50 770.50 1084.50 1660.00 9784.50
1989 1667.00 1792.00 1427.50 835.00 366.00 148.50 13.00 76.00 310.00 632.50 1251.50 1942.00 10461.00
1990 1479.50 1505.50 1177.00 743.50 440.50 89.50 34.00 58.00 258.00 734.00 1034.50 1704.00 9258.00
1991 1889.50 1320.00 1175.50 596.50 273.00 50.00 42.00 31.00 339.50 769.00 1296.00 1558.50 9340.50
1992 1568.00 1292.00 1153.00 832.50 309.50 187.50 151.50 140.00 346.50 693.00 1154.50 1637.00 9465.00
1993 1797.50 1459.00 1170.50 777.50 397.00 193.00 42.50 50.50 448.50 770.00 1249.50 1582.55 a 9938.05
1994 2147.50 1676.00 1106.50 731.50 312.00 91.00 45.50 95.50 221.50 548.00 960.50 1377.00 9312.50
1995 1693.50 1563.00 1142.00 875.50 358.00 64.50 57.50 16.50 317.00 690.00 1387.00 1718.50 9883.00
1996 2099.00 1614.50 1472.00 901.00 425.00 120.50 57.00 25.00 278.00 666.50 1341.50 1735.50 10735.50
1997 1864.13 a 1399.00 1230.00 768.50 497.00 38.50 59.50 102.50 188.50 599.00 1179.50 1291.50 9217.63
1998 1532.00 980.50 1128.00 555.50 184.00 146.50 24.50 16.50 171.00 544.00 1022.50 1471.00 7776.00
1999 1729.50 1183.50 1050.00 606.50 285.50 107.50 19.50 51.50 311.50 665.50 870.50 1390.50 8271.50
2000 1725.00 1216.50 929.00 715.00 303.50 185.00 33.50 44.00 338.00 580.00 1093.00 1947.00 9109.50
2001 1473.50 1621.50 1206.50 660.50 299.50 98.00 40.50 32.50 273.50 669.50 781.50 1356.50 8513.50
2002 1498.50 1199.00 1445.50 768.00 504.50 61.50 7.00 31.50 205.00 916.50 1187.00 1380.00 9204.00
2003 1717.00 1544.00 1227.00 691.00 336.00 89.50 19.00 16.50 275.00 618.50 1172.50 1378.00 9084.00
2004 1928.00 1326.50 1088.00 710.50 499.50 171.50 57.50 158.50 148.00 608.00 974.50 1589.00 9259.50
2005 1822.00 1266.00 1218.50 566.50 413.00 78.00 36.00 78.00 185.00 592.00 1022.00 1429.50 8706.50
2006 1254.50 1471.50 0.00 z 0.00 z 0.00 z 0.00 z 0.00 z 0.00 z 0.00 z 734.00 991.00 1287.50 5738.50
2007 1582.00 1597.50 1043.50 723.00 249.00 59.00 31.00 65.00 257.50 517.50 1075.50 1644.00 8844.50
2008 0.00 z 1615.50 1277.00 777.00 459.50 126.00 27.50 34.50 254.00 610.50 1060.00 1874.00 8115.50
2009 1934.50 1389.50 1206.50 678.50 421.00 170.00 88.00 109.50 103.50 815.00 842.00 1651.00 9409.00
2010 1724.50 1386.50 849.00 490.00 329.00 125.50 2.50 34.50 359.50 532.50 1035.00 1662.00 8530.50
2011 1866.50 1439.50 1228.00 726.50 380.00 135.50 17.00 27.00 313.50 525.50 1010.50 1361.50 9031.00
2012 1517.50 1234.00 798.50 666.00 301.00 64.00 3.50 52.50 301.00 729.00 1081.50 1566.00 8314.50
2013 1712.50 1452.00 957.00 j 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 3164.50
Period of Record Statistics
MEAN 1797.97 1485.06 1235.03 733.81 374.96 129.24 42.04 78.95 299.31 644.49 1112.03 1613.14 9546.46
S.D. 196.95 181.69 166.10 116.33 101.32 56.47 27.35 42.20 73.05 117.78 135.73 189.77 664.08
SKEW -0.03 -0.01 -0.29 -0.03 0.05 0.72 1.19 0.38 0.24 0.35 0.10 0.17 0.10
MAX 2218.00 2065.00 1553.00 1034.50 642.00 288.00 151.50 174.50 538.97 1053.00 1390.86 2062.00 11545.16
MIN 1254.50 980.50 798.50 490.00 113.00 33.50 1.00 8.00 103.50 301.50 781.50 1267.79 7776.00
NO YRS 96 98 96 95 96 97 97 97 97 98 97 98 92