PASADENA, CALIFORNIA

Monthly Total Heating Degree Days

(046719)

Base Temperature = 65 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
1893 265.50 315.78 a 423.50 239.00 138.00 25.00 0.00 z 0.00 71.50 171.00 315.50 336.50 2301.28
1894 506.50 416.50 0.00 z 0.00 z 0.00 z 0.00 z 0.00 0.00 20.50 64.50 152.00 401.50 1561.50
1895 469.00 0.00 z 322.50 196.00 0.00 z 0.00 z 0.00 8.50 11.00 0.00 z 0.00 z 0.00 z 1007.00
1896 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 0.00 z 0.00 z 0.00
1897 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 0.00 z 0.00 z 0.00
1898 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 0.00 z 0.00 z 0.00
1899 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 0.00 z 0.00 z 0.00
1900 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 0.00 z 0.00 z 0.00
1901 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 0.00 z 0.00 z 0.00
1902 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 0.00 z 0.00 z 0.00
1903 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 0.00 z 0.00 z 0.00
1904 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 0.00 z 0.00 z 0.00
1905 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 0.00 z 0.00 z 0.00
1906 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 0.00 z 0.00 z 0.00
1907 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 0.00 z 0.00 z 0.00
1908 0.00 z 0.00 z 0.00 z 0.00 z 126.98 e 53.00 0.00 0.00 15.00 115.50 231.00 385.00 926.48
1909 379.50 400.00 369.00 161.50 153.50 20.50 0.00 0.00 9.50 86.50 251.00 446.00 2277.00
1910 453.50 354.00 226.30 a 123.50 56.00 14.00 0.00 0.00 4.50 70.00 215.50 289.00 1806.30
1911 365.50 449.00 259.50 244.50 149.50 66.00 2.50 0.50 31.00 126.00 194.00 430.00 2318.00
1912 299.00 244.00 429.00 313.00 124.00 28.00 17.50 12.50 34.00 177.50 142.50 425.00 2246.00
1913 495.50 391.50 321.00 206.00 118.50 53.00 15.50 9.00 11.00 105.00 258.50 428.00 2412.50
1914 419.50 276.00 194.00 167.50 169.50 42.00 0.00 0.00 3.50 17.00 71.50 481.50 1842.00
1915 401.00 371.50 223.50 215.00 192.00 1.50 0.00 0.00 40.50 107.50 230.50 371.00 2154.00
1916 539.00 229.50 202.53 a 156.50 167.00 50.00 0.00 a 13.00 15.50 228.00 306.50 530.00 2437.53
1917 580.00 385.50 381.00 318.50 270.50 37.00 0.00 0.00 8.50 53.50 173.50 236.50 2444.50
1918 411.00 378.50 310.00 181.00 194.50 3.00 0.00 8.00 1.00 23.00 285.00 430.50 2225.50
1919 337.50 446.50 424.50 189.50 158.00 11.00 0.00 0.00 11.90 a 155.50 266.50 371.00 2371.90
1920 384.00 332.00 364.50 238.50 131.00 18.00 0.00 3.50 11.00 152.50 277.00 428.50 2340.50
1921 453.50 329.00 250.00 258.00 217.00 30.00 0.00 0.00 13.00 67.00 184.00 271.00 2072.50
1922 502.50 409.50 385.95 a 287.50 100.50 29.00 0.00 0.00 0.00 91.50 304.00 332.00 2442.45
1923 346.68 a 333.50 227.85 a 243.00 83.00 81.00 1.00 0.00 15.00 84.50 102.50 344.00 1862.03
1924 366.50 181.50 372.00 208.00 66.00 6.72 a 0.00 0.50 11.50 120.00 142.24 a 388.50 1863.47
1925 343.50 261.50 241.00 215.00 78.02 a 36.50 0.00 0.00 1.00 85.50 164.00 169.50 1595.52
1926 293.50 201.00 159.50 111.00 60.00 0.00 l 4.77 e 0.00 6.96 b 33.67 b 79.14 a 418.50 c 1368.04
1927 338.50 307.00 311.50 232.50 99.50 31.55 a 0.00 0.00 1.50 28.50 f 109.00 398.50 1829.55
1928 244.00 253.50 210.50 115.00 62.00 24.00 0.00 0.00 0.50 102.50 170.00 337.00 1519.00
1929 406.50 383.00 290.00 267.50 42.50 38.50 0.00 0.00 3.50 22.50 106.55 a 161.00 1721.55
1930 423.50 206.00 250.50 131.00 178.00 20.50 0.00 0.00 18.50 54.00 153.50 311.00 1746.50
1931 302.00 231.50 119.50 71.00 17.00 14.00 0.00 0.00 3.00 64.00 323.00 462.00 1607.00
1932 492.50 360.00 168.00 150.00 87.50 52.50 1.00 4.00 3.00 51.00 62.50 451.00 1883.00
1933 459.50 359.50 237.67 d 220.50 189.00 45.50 0.00 0.00 23.50 64.67 b 122.00 328.50 2050.34
1934 266.00 249.00 54.00 59.50 25.50 44.00 0.00 0.00 15.00 74.50 206.50 322.00 1316.00
1935 393.00 250.50 389.00 183.50 138.00 3.00 9.50 0.00 0.00 55.00 238.00 312.50 1972.00
1936 307.50 337.00 241.00 165.00 37.00 21.50 0.00 0.00 0.00 56.00 92.00 322.50 1579.50
1937 670.50 365.00 295.50 151.50 95.00 18.50 0.00 0.00 2.00 33.00 163.50 207.00 2001.50
1938 249.50 329.50 316.00 190.34 a 97.00 30.00 0.00 1.50 0.00 54.00 216.50 218.50 1702.84
1939 383.50 432.50 324.00 117.50 104.50 15.50 0.00 0.00 1.50 49.50 73.45 a 177.00 1678.95
1940 291.50 177.50 h 183.00 147.50 38.00 6.00 2.00 0.00 0.00 49.50 167.00 225.50 1110.00
1941 316.00 231.00 217.50 231.50 44.00 24.00 0.00 0.00 15.50 105.50 142.00 347.50 1674.50
1942 304.00 352.00 257.82 a 203.00 119.00 17.00 0.00 3.50 7.50 60.00 164.50 284.00 1772.32
1943 324.50 227.50 253.00 147.50 60.00 59.50 0.00 0.00 0.00 68.00 108.50 329.50 1578.00
1944 347.50 405.50 258.00 220.00 61.50 j 82.00 4.00 0.00 7.50 45.00 253.00 252.00 1874.50
1945 341.50 296.50 386.00 207.00 118.00 53.50 0.00 0.00 9.50 31.00 191.50 312.00 1946.50
1946 310.00 349.00 266.50 121.00 142.50 0.00 0.00 0.00 i 0.00 87.50 239.50 258.00 f 1516.00
1947 350.00 174.00 181.41 d 139.50 81.00 11.00 0.00 0.00 1.00 24.00 261.50 329.50 1552.91
1948 283.50 365.00 373.50 188.00 121.00 30.00 0.00 0.00 13.50 64.50 174.50 439.00 2052.50
1949 637.10 b 419.44 c 351.00 125.00 112.50 4.50 0.00 0.00 f 0.00 86.00 66.50 340.00 2142.04
1950 510.00 264.00 243.00 134.00 149.50 35.00 0.00 0.00 8.50 14.50 145.50 144.00 1648.00
1951 356.00 312.50 253.50 196.00 111.50 27.00 0.00 3.50 0.00 43.00 195.00 406.50 1904.50
1952 467.50 296.50 421.00 195.50 31.00 59.50 0.00 0.00 4.50 30.50 282.50 379.00 2167.50
1953 226.00 249.50 264.50 249.50 134.00 56.00 0.00 0.50 5.50 49.50 135.50 282.00 1652.50
1954 379.00 132.50 315.00 160.50 68.50 30.00 0.00 0.00 1.00 61.00 113.50 326.50 1587.50
1955 456.50 312.00 208.50 190.00 140.00 35.50 1.00 0.00 11.00 75.00 203.50 355.00 1988.00
1956 339.00 421.50 195.00 228.00 110.00 1.50 0.50 1.50 0.00 63.50 79.00 227.00 1666.50
1957 406.00 192.50 181.50 156.00 79.00 2.50 0.00 0.00 0.00 52.50 224.00 204.50 1498.50
1958 275.90 a 201.00 324.50 137.50 36.50 1.00 0.00 0.00 c 0.00 9.00 123.00 161.50 1269.90
1959 211.12 b 312.67 a 69.00 f 43.50 56.00 0.00 0.00 0.00 0.00 14.00 45.50 213.50 896.29
1960 365.00 g 283.00 143.50 93.50 48.00 0.50 f 0.00 0.00 0.00 42.00 202.50 249.50 1062.00
1961 170.00 156.00 208.00 107.50 93.50 17.00 0.00 0.00 3.50 59.50 175.96 d 312.00 1302.96
1962 292.00 344.00 347.00 54.00 116.50 45.00 0.00 0.00 0.00 31.50 155.00 262.50 1647.50
1963 348.00 124.00 259.00 209.00 66.00 36.50 0.00 0.00 0.00 10.50 145.50 222.50 1421.00
1964 342.50 240.50 262.00 194.00 115.50 31.50 0.00 0.00 0.00 9.00 227.00 323.50 1745.50
1965 254.50 234.50 242.50 214.50 93.50 48.50 0.00 0.00 8.00 5.00 169.50 322.50 1593.00
1966 344.00 300.00 163.50 68.50 45.00 7.50 0.00 0.00 0.00 4.00 161.00 255.50 1349.00
1967 272.00 130.50 210.00 342.50 84.00 61.00 0.00 0.00 0.00 0.00 76.50 360.50 1537.00
1968 287.50 135.00 147.50 107.50 86.50 21.00 0.00 0.00 1.50 23.00 129.00 370.00 1308.50
1969 310.50 370.50 257.00 132.00 47.50 28.00 0.00 0.00 0.00 40.00 88.00 239.50 1513.00
1970 309.50 147.50 186.00 168.50 53.50 12.00 0.00 0.00 0.00 33.50 130.50 342.50 1383.50
1971 299.50 245.50 203.50 178.00 122.00 42.00 0.00 0.00 1.50 97.50 181.00 423.50 1794.00
1972 325.50 185.50 88.50 85.00 68.00 2.00 0.00 0.00 0.00 47.00 181.00 313.50 1296.00
1973 364.00 230.50 314.50 118.00 31.00 14.00 0.00 0.00 0.00 14.00 0.00 z 235.60 a 1321.60
1974 346.50 181.00 231.43 b 77.50 71.50 5.00 0.00 0.00 0.00 50.00 125.69 a 325.50 1414.12
1975 266.00 296.59 a 277.00 267.50 84.50 35.00 0.00 0.00 0.00 64.07 a 163.00 262.50 1716.16
1976 206.50 264.50 224.50 222.50 45.50 16.50 0.00 0.00 0.00 10.00 81.00 211.00 1282.00
1977 287.50 114.00 294.00 87.50 156.00 5.00 0.00 0.00 0.50 20.50 70.00 179.00 1214.00
1978 279.50 226.00 171.00 0.00 z 38.00 1.50 0.00 0.00 0.00 5.50 229.00 374.00 1324.50
1979 412.00 297.50 0.00 z 101.00 72.00 14.00 0.00 0.00 0.00 25.00 157.50 193.50 1272.50
1980 257.00 137.50 179.50 99.50 116.00 22.00 0.00 0.00 0.50 24.50 115.00 162.50 1114.00
1981 204.50 151.00 216.00 93.50 30.50 0.00 0.00 0.00 0.00 56.00 123.00 214.00 1088.50
1982 355.50 185.50 272.00 129.50 53.50 29.50 0.00 0.00 1.50 11.00 211.50 337.50 1587.00
1983 247.50 227.50 234.50 210.50 57.00 17.50 0.00 0.00 2.50 8.00 187.00 281.50 1473.50
1984 209.50 153.50 90.00 104.50 14.00 1.50 0.00 0.00 0.00 31.50 224.00 395.50 1224.00
1985 354.50 242.50 248.50 61.50 49.00 8.00 0.00 0.00 0.50 13.50 242.50 224.00 1444.50
1986 133.00 208.00 139.50 86.50 31.00 0.00 0.00 0.00 25.00 16.50 56.50 250.50 946.50
1987 324.50 205.50 199.50 32.50 42.50 0.00 0.00 0.00 0.00 6.00 133.50 392.00 1336.00
1988 272.00 112.50 114.00 100.00 39.50 9.00 0.00 0.00 2.50 6.00 168.50 339.00 1163.00
1989 357.50 297.00 129.50 43.50 51.50 20.50 0.00 0.00 2.00 38.00 104.50 228.50 1272.50
1990 281.00 296.50 200.50 86.00 64.50 9.00 0.00 0.00 0.00 3.00 94.00 336.50 1371.00
1991 254.50 63.00 296.50 83.00 56.50 0.00 0.00 0.00 0.00 32.50 69.00 241.50 1096.50
1992 224.00 160.00 190.00 13.00 0.00 1.50 0.00 0.00 0.00 7.00 119.50 381.50 1096.50
1993 370.50 262.00 101.00 29.00 5.00 11.00 0.00 0.00 0.00 2.00 115.00 281.00 1176.50
1994 206.00 261.00 128.50 94.50 71.50 0.00 0.00 0.00 0.00 13.50 281.00 300.00 1356.00
1995 357.50 134.50 185.50 123.50 104.00 30.50 0.00 0.00 0.00 3.50 49.50 251.50 1240.00
1996 248.00 183.50 132.50 46.50 12.00 1.50 0.00 0.00 0.00 66.00 144.50 278.50 1113.00
1997 281.50 151.50 82.50 83.00 0.00 1.50 0.00 0.00 0.00 6.50 129.50 308.00 1044.00
1998 280.00 294.50 161.00 170.00 87.00 21.50 0.00 0.00 0.50 21.50 155.00 301.50 1492.50
1999 252.00 203.00 259.00 209.00 54.00 25.00 0.00 0.00 a 0.00 a 0.00 109.50 210.59 b 1322.09
2000 210.50 220.61 a 148.28 a 34.00 10.50 0.00 0.00 a 0.00 0.00 40.30 a 206.38 a 161.64 c 1032.21
2001 336.50 334.96 a 146.00 158.79 a 1.55 a 0.00 e 0.00 a 0.00 0.00 10.69 b 112.50 b 315.34 b 1416.34
2002 293.00 147.50 167.50 110.00 45.50 0.00 0.00 0.00 1.50 56.00 53.00 285.41 b 1159.41
2003 72.50 213.50 116.50 172.00 61.00 20.00 0.00 0.00 0.00 7.50 173.00 264.00 1100.00
2004 239.50 270.50 63.00 66.50 5.50 0.00 0.00 0.00 1.00 65.50 191.50 235.50 1138.50
2005 249.50 197.00 140.10 e 74.50 0.00 j 0.00 0.00 0.00 0.00 g 27.50 72.00 210.50 971.10
2006 222.50 156.50 301.50 159.00 18.00 0.00 0.00 0.00 0.00 17.50 80.00 214.50 f 955.00
2007 307.50 190.50 96.62 a 88.20 e 18.50 0.50 0.00 0.00 5.50 14.00 87.50 322.00 1130.82
2008 321.50 226.00 104.50 97.00 66.50 0.00 0.00 0.00 0.00 6.50 40.50 292.00 1154.50
2009 143.00 219.50 140.00 94.50 0.00 11.50 0.00 0.00 0.00 25.50 61.00 280.50 975.50
2010 202.50 181.00 117.50 114.00 41.00 0.50 0.00 0.00 0.50 30.00 165.00 224.50 1076.50
2011 174.12 a 282.50 170.00 75.50 59.00 5.00 0.00 0.00 0.00 15.50 135.00 a 265.50 1182.12
2012 147.50 184.50 159.00 68.00 21.50 0.00 0.00 0.00 0.00 7.50 84.00 277.50 949.50
2013 263.50 219.00 86.50 5.50 z 0.00 z 0.00 z 0.00 z 0.00 z 0.00 z 0.00 z 0.00 z 16.50 z 569.00
Period of Record Statistics
MEAN 327.60 261.93 230.25 150.36 81.76 21.06 0.55 0.66 5.26 48.41 158.88 305.80 1585.05
S.D. 102.70 88.76 89.99 70.41 53.39 19.90 2.49 2.30 10.12 42.64 68.84 82.44 404.83
SKEW 0.66 0.18 0.28 0.33 0.77 0.92 5.56 4.01 3.60 1.52 0.38 0.20 0.49
MAX 670.50 449.00 429.00 342.50 270.50 82.00 17.50 13.00 71.50 228.00 323.00 530.00 2444.50
MIN 72.50 63.00 54.00 13.00 0.00 0.00 0.00 0.00 0.00 0.00 40.50 144.00 946.50
NO YRS 107 106 105 105 104 104 107 106 107 106 106 105 91