PALO ALTO, CALIFORNIA

Monthly Total Heating Degree Days

(046646)

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
1953 0.00 z 0.00 z 0.00 z 0.00 z 0.00 z 0.00 z 0.00 z 0.00 z 27.00 181.00 258.00 435.00 901.00
1954 478.00 350.50 429.00 179.00 154.00 81.00 14.50 52.00 65.50 159.00 315.00 532.50 2810.00
1955 597.00 433.00 349.00 366.50 139.00 94.00 47.50 72.50 68.00 145.00 336.50 373.00 3021.00
1956 429.00 482.00 372.50 258.50 123.50 49.50 21.00 16.00 25.00 158.00 327.00 525.00 2787.00
1957 615.50 326.50 298.50 205.50 130.00 28.50 7.50 27.50 19.50 119.50 335.00 503.50 2617.00
1958 479.50 255.00 420.50 225.56 c 101.50 22.00 6.00 0.50 20.50 114.50 320.00 410.00 2375.56
1959 417.50 413.50 300.50 176.50 164.00 63.50 12.00 27.00 33.00 94.50 327.50 515.00 2544.50
1960 535.50 412.50 295.00 261.00 187.50 33.00 22.22 a 39.50 65.50 187.00 378.50 537.85 a 2955.07
1961 574.50 339.00 382.50 251.50 232.50 48.00 23.50 19.00 81.35 d 165.00 378.00 562.00 3056.85
1962 590.00 404.50 447.50 212.07 a 206.00 75.50 45.50 26.00 92.50 180.00 343.97 a 516.50 3140.03
1963 670.50 249.50 413.50 328.33 c 120.00 j 54.00 e 39.50 33.50 18.50 159.00 380.00 650.00 2996.33
1964 588.00 465.00 427.50 321.50 284.50 129.50 45.43 b 26.00 95.00 131.50 463.50 465.57 d 3443.01
1965 539.50 431.00 410.00 265.18 b 217.50 128.50 58.38 a 9.30 a 103.50 116.25 a 308.79 a 676.04 e 3263.94
1966 328.50 m 274.00 m 267.50 k 138.00 j 92.50 l 78.89 c 59.00 20.50 63.00 166.50 333.50 502.89 d 1224.28
1967 528.50 401.33 d 353.73 c 445.00 c 132.50 g 42.00 m 2.50 p 2.00 l 0.00 o 47.00 m 146.00 j 543.50 2272.07
1968 576.00 270.50 292.00 234.50 160.00 34.00 9.50 9.50 25.00 158.00 329.50 547.50 2646.00
1969 591.50 456.50 377.50 264.50 114.00 32.50 8.50 13.50 25.50 158.00 321.00 426.00 2789.00
1970 440.00 334.50 298.00 325.50 118.00 54.00 18.00 53.50 50.50 220.50 293.00 546.50 2752.00
1971 523.50 426.00 388.50 309.83 a 180.00 77.00 23.50 1.00 39.00 264.50 402.00 621.00 3255.83
1972 612.00 377.00 252.00 245.00 134.50 42.50 11.00 4.00 66.50 162.00 412.00 643.50 2962.00
1973 572.50 372.00 450.00 207.00 119.00 45.00 14.50 37.20 a 42.00 180.00 356.00 485.15 a 2880.35
1974 541.50 474.50 355.00 293.28 a 171.50 53.50 14.47 a 12.40 a 60.50 123.50 381.50 529.14 b 3010.78
1975 569.37 a 402.23 b 359.27 c 358.50 142.27 c 63.62 a 33.00 19.63 a 56.50 176.50 338.50 463.50 2982.89
1976 511.00 414.80 a 387.50 312.00 133.00 93.50 13.50 8.00 33.00 114.50 263.00 541.47 a 2825.27
1977 572.50 307.50 235.50 o 241.50 272.50 46.00 29.50 26.00 64.50 0.00 z 309.50 395.00 2264.50
1978 401.50 331.69 b 229.00 283.97 a 73.50 l 47.00 26.00 9.50 37.50 127.74 b 421.50 653.50 2568.90
1979 566.27 a 451.50 326.02 a 191.50 g 106.20 d 63.62 a 8.00 17.64 b 8.04 b 117.00 364.00 493.00 2521.28
1980 442.55 b 327.00 373.50 232.76 a 207.91 b 121.50 44.43 a 39.27 a 44.50 h 159.59 d 348.62 a 493.00 2790.14
1981 464.00 331.00 379.50 262.24 a 120.00 14.00 29.45 a 26.00 44.50 214.70 d 226.03 a 409.50 2520.93
1982 639.50 356.50 399.50 281.50 168.00 125.00 74.50 29.50 42.00 168.00 441.00 540.50 3265.50
1983 383.00 j 364.50 354.00 293.00 185.00 46.50 33.50 8.50 6.50 63.50 j 200.50 r 0.00 z 1291.50
1984 492.00 408.00 255.50 281.00 102.00 59.50 4.50 19.00 8.50 179.50 386.50 572.00 2768.00
1985 590.50 0.00 z 436.00 175.00 176.00 25.00 9.50 36.50 71.00 207.50 430.00 587.00 2744.00
1986 376.50 297.50 255.50 249.50 142.50 33.00 15.50 32.50 108.50 132.00 319.00 525.00 2487.00
1987 565.00 0.00 z 0.00 z 148.00 121.00 55.00 51.00 15.50 31.00 100.50 323.00 487.50 1897.50
1988 498.50 357.50 275.50 214.50 185.00 60.50 5.50 9.50 60.00 129.00 327.00 535.00 2657.50
1989 590.50 496.00 293.50 152.00 154.00 53.00 24.00 15.50 68.50 178.00 318.50 532.00 2875.50
1990 531.00 502.00 353.50 165.00 60.97 a 0.00 z 10.00 10.00 10.50 119.50 362.00 694.50 2818.97
1991 566.50 327.50 462.00 294.00 212.50 0.00 z 25.50 38.50 45.00 133.00 337.50 550.50 2992.50
1992 610.00 329.00 304.00 164.50 53.00 49.50 20.00 27.50 51.00 100.00 371.50 606.50 2686.50
1993 592.00 457.50 333.50 283.50 144.00 67.50 14.50 0.00 z 158.00 243.00 502.00 696.50 3492.00
1994 641.50 589.50 431.00 380.00 311.00 193.50 102.50 5.50 22.50 162.00 489.00 596.00 3924.00
1995 384.50 294.50 339.50 221.50 153.00 86.00 2.50 10.00 36.00 99.00 230.00 376.50 2233.00
1996 447.50 304.50 277.50 180.50 94.50 30.00 0.50 6.00 22.00 172.50 319.50 412.00 2267.00
1997 449.00 362.00 237.00 131.00 54.50 22.50 3.50 3.00 0.50 138.00 244.00 510.50 2155.50
1998 413.00 389.50 307.50 0.00 z 207.00 59.00 12.50 8.00 29.50 127.00 k 351.00 604.50 2381.50
1999 524.33 b 450.00 421.00 282.50 190.00 84.81 d 0.00 z 0.00 z 0.00 z 0.00 z 271.67 c 365.00 h 2224.30
2000 433.00 341.50 0.00 z 0.00 z 0.00 z 0.00 z 0.00 z 0.00 z 0.00 z 144.67 a 351.00 f 270.00 m 919.17
2001 156.00 v 542.89 a 395.77 a 415.50 91.85 d 19.82 b 9.00 g 14.98 a 11.50 f 68.00 f 258.46 d 496.52 a 2235.79
2002 578.50 359.50 356.00 218.50 167.50 26.50 1.00 i 0.00 z 25.00 148.00 310.50 456.50 2646.50
2003 373.50 391.50 237.00 f 220.00 i 132.50 16.50 l 6.00 f 1.50 17.50 66.77 e 273.00 j 483.50 1466.77
2004 500.77 e 294.00 j 128.00 j 0.00 z 65.50 l 25.50 19.93 c 6.50 38.00 187.00 383.00 509.50 1670.20
2005 566.00 344.00 275.50 270.50 119.00 38.50 0.00 e 20.50 75.50 146.00 316.00 430.00 2601.50
2006 498.00 389.00 351.50 f 272.00 112.00 24.50 16.50 29.28 d 50.00 177.00 355.50 577.50 2501.28
2007 625.00 381.50 291.50 256.00 129.00 58.20 e 2.00 16.50 h 58.50 208.00 338.50 593.81 b 2942.01
2008 579.00 456.00 341.00 285.60 e 164.00 33.50 l 12.52 e 13.50 g 29.42 d 94.50 i 288.50 607.48 e 2763.52
2009 405.00 f 410.87 e 277.00 g 250.00 91.85 d 40.00 12.00 i 1.00 f 12.00 j 76.00 l 288.00 h 354.50 k 792.72
2010 291.00 m 371.00 358.50 319.00 213.50 46.73 d 27.56 d 39.00 38.00 0.00 z 384.00 380.00 f 1797.29
2011 509.90 b 486.37 a 367.23 e 263.28 a 0.00 z 90.00 14.97 b 10.16 b 19.29 b 112.78 b 419.48 a 610.81 d 2904.25
2012 540.78 d 415.13 b 376.00 255.56 c 121.33 b 45.00 c 20.00 17.22 d 93.10 a 146.98 b 330.54 b 535.50 2897.13
2013 642.98 b 299.00 k 177.50 m 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 642.98
Period of Record Statistics
MEAN 530.66 389.37 350.29 259.80 153.37 59.22 23.24 20.80 47.15 153.96 345.07 529.52 2832.03
S.D. 75.51 70.75 60.88 65.78 54.21 34.05 20.04 15.03 30.36 38.94 58.97 78.73 363.97
SKEW -0.41 0.37 -0.13 0.42 0.68 1.59 1.72 1.08 1.12 0.43 0.42 0.07 0.59
MAX 670.50 589.50 462.00 445.00 311.00 193.50 102.50 72.50 158.00 264.50 502.00 696.50 3924.00
MIN 373.50 249.50 229.00 131.00 53.00 14.00 0.00 0.50 0.50 66.77 226.03 373.00 2155.50
NO YRS 55 55 51 53 52 53 52 51 54 51 55 55 33