PORTOLA, CALIFORNIA

Monthly Total Heating Degree Days

(047085)

Base Temperature = 65 F

File last updated on Jul 24, 2006
*** Note *** Provisional Data *** After Year/Month 200603
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
1948 0.00 z 0.00 z 0.00 z 0.00 z 0.00 z 0.00 z 135.50 221.00 296.50 536.00 799.00 1250.50 3238.50
1949 1518.00 1128.50 879.00 520.50 380.50 212.50 113.00 150.35 a 195.00 433.50 g 655.00 1167.50 6919.85
1950 1296.50 831.50 856.50 595.50 467.00 278.50 86.50 155.00 347.00 529.50 611.00 806.50 6861.00
1951 1058.50 832.00 854.00 557.00 448.50 231.00 100.00 133.50 157.50 d 639.24 b 792.00 1143.00 6946.24
1952 1296.00 1033.50 1083.00 599.00 422.50 315.00 35.00 151.00 220.50 402.00 926.00 1055.00 7538.50
1953 883.00 833.78 a 860.00 686.00 626.50 374.00 83.00 193.50 129.00 558.00 713.00 939.00 6878.78
1954 1010.00 776.00 916.50 532.00 326.50 290.00 71.00 202.50 328.50 545.50 722.00 1066.50 6787.00
1955 1320.00 1019.00 927.42 a 823.00 451.00 251.00 155.00 80.00 288.00 490.50 790.50 942.00 7537.42
1956 1082.00 1206.00 859.00 635.00 444.00 262.00 100.50 164.00 240.00 562.13 a 799.00 1034.50 7388.13
1957 1327.50 844.50 785.00 649.00 476.00 163.00 94.00 213.50 202.00 609.50 840.50 995.00 7199.50
1958 1033.50 770.00 974.00 705.50 342.00 250.50 94.00 12.00 0.00 z 422.12 a 740.50 817.50 6161.62
1959 884.61 c 933.00 743.00 541.50 513.50 177.50 50.00 136.00 318.50 449.50 798.00 1124.00 6669.11
1960 1183.54 c 931.62 e 750.72 a 641.00 529.00 170.19 d 59.00 164.00 235.50 577.50 724.00 f 1036.00 6278.07
1961 970.00 828.50 887.50 707.50 616.50 147.50 f 123.50 92.43 d 325.50 479.50 f 845.69 a 1043.50 6440.62
1962 1139.00 986.50 1019.50 527.00 528.00 230.00 86.50 142.50 206.50 507.50 717.50 890.00 6980.50
1963 1044.00 611.50 887.00 816.50 385.50 268.50 186.00 180.50 175.50 463.50 773.00 945.00 6736.50
1964 1099.00 1058.50 920.00 691.50 522.50 308.50 103.50 0.00 z 336.50 418.00 903.00 917.50 7278.50
1965 1093.50 863.00 819.00 633.50 517.50 242.50 104.50 142.00 385.00 438.00 818.00 1168.00 7224.50
1966 1195.00 1018.00 793.50 544.50 314.00 239.00 149.00 62.50 221.50 482.00 789.50 1058.50 6867.00
1967 1050.00 815.50 903.00 912.00 442.00 255.50 53.50 22.22 a 147.00 464.00 682.00 1238.50 6985.22
1968 0.00 z 809.50 780.50 631.00 473.00 170.50 47.00 173.50 251.50 502.50 766.50 1133.00 5738.50
1969 1093.00 1036.50 982.00 648.00 308.50 198.50 59.50 73.50 189.50 637.00 751.50 934.50 6912.00
1970 937.50 755.50 783.00 718.50 416.00 189.00 45.50 99.00 304.80 e 488.50 i 754.00 0.00 z 5002.80
1971 362.50 u 919.50 420.50 r 733.80 e 611.06 e 0.00 z 40.82 a 91.81 e 355.00 408.50 l 386.00 q 693.50 m 2751.98
1972 1285.90 e 626.00 i 499.50 g 722.78 c 444.52 c 94.50 i 62.57 d 90.50 f 337.80 e 342.00 k 499.00 m 202.00 z 2853.57
1973 591.50 n 514.50 k 0.00 z 300.50 o 286.50 i 93.00 o 38.50 n 0.00 z 0.00 z 0.00 z 0.00 z 0.00 z 0.00
1974 0.00 z 645.50 h 831.00 726.11 c 502.31 d 247.00 156.50 143.00 199.50 0.00 z 0.00 z 338.00 w 2805.43
1975 1114.89 c 930.42 d 897.34 c 903.46 d 346.00 i 251.54 d 107.97 b 198.83 b 148.33 c 608.00 701.00 f 962.15 d 6122.92
1976 1021.85 d 904.44 e 909.91 d 560.50 g 342.50 h 351.96 b 122.93 b 222.50 f 216.00 510.97 b 713.04 b 1024.55 a 5775.64
1977 1163.57 b 784.00 c 614.00 j 560.56 c 665.35 d 71.50 g 65.88 c 72.52 c 316.20 e 308.50 k 784.80 e 199.50 w 4412.87
1978 534.00 n 829.92 c 634.35 d 686.90 a 448.98 a 234.44 c 65.50 150.02 c 299.44 c 411.27 a 863.89 c 711.00 m 4624.71
1979 1154.48 b 925.17 d 777.77 c 658.50 363.45 b 223.97 a 99.72 a 138.50 129.83 a 456.70 c 829.82 b 954.05 b 6711.94
1980 978.00 766.35 b 880.40 a 581.50 475.13 e 356.25 b 100.46 d 119.35 a 216.11 c 475.00 488.50 j 902.44 d 5851.00
1981 895.12 c 833.50 781.31 d 571.61 b 0.00 z 138.62 a 75.43 a 58.42 e 0.00 z 0.00 z 525.50 h 824.37 d 4178.39
1982 1159.00 835.50 549.50 j 736.50 415.00 252.00 97.50 91.50 299.50 407.50 k 900.00 1037.00 5823.50
1983 970.00 799.50 841.00 786.00 431.00 271.00 205.00 112.00 241.50 464.50 861.50 915.53 a 6898.53
1984 1020.13 d 0.00 z 287.00 r 663.50 335.00 254.00 17.00 59.00 197.50 646.50 861.50 1134.50 5188.63
1985 1059.50 955.50 986.50 535.00 480.50 a 168.50 33.50 115.00 373.00 584.00 1015.50 1007.50 7314.00
1986 791.50 760.00 685.50 633.50 454.00 165.00 114.00 43.50 450.50 535.50 732.50 952.50 6318.00
1987 1166.00 856.00 841.00 502.50 377.00 171.50 190.50 73.00 200.00 393.00 768.50 1100.50 6639.50
1988 1138.50 854.50 784.00 587.50 536.50 241.00 46.50 57.50 263.00 363.00 817.50 1107.50 6797.00
1989 1251.50 1070.50 792.00 538.00 483.50 205.50 128.50 193.00 300.50 596.50 790.50 972.50 7322.50
1990 1053.00 1096.50 803.50 512.00 514.00 296.00 67.50 128.00 240.50 497.50 878.50 1362.00 7449.00
1991 1080.50 705.00 1003.00 688.50 584.00 315.00 48.50 74.50 147.50 435.50 769.50 1078.00 6929.50
1992 1068.00 807.00 739.50 543.00 244.50 197.00 110.50 68.50 215.50 463.50 822.93 a 1242.00 6521.93
1993 1352.50 1057.00 787.00 670.00 410.50 297.50 116.00 147.50 251.00 484.50 867.50 1095.50 7536.50
1994 964.50 988.50 734.50 616.50 427.00 244.50 26.00 97.00 250.50 622.50 1077.00 1130.00 7178.50
1995 1014.50 725.00 924.00 739.50 525.50 306.00 129.00 145.00 216.50 493.50 670.50 937.00 6826.00
1996 965.00 859.50 848.37 a 645.50 467.50 186.50 17.50 77.00 306.00 560.50 758.50 990.45 a 6682.32
1997 1060.00 859.50 703.50 659.00 336.00 229.00 83.50 109.50 245.50 606.00 743.00 1127.00 6761.50
1998 1010.50 941.00 833.00 715.50 666.00 295.50 55.50 89.00 222.50 642.50 840.50 1157.50 7469.00
1999 1008.57 b 941.50 875.48 b 756.50 481.00 255.00 e 0.00 z 134.33 a 190.34 a 460.87 a 701.38 a 1027.50 6832.48
2000 1024.07 b 862.75 a 812.00 579.31 a 434.50 156.50 132.00 86.50 289.00 577.50 965.00 961.50 6880.63
2001 1100.50 1000.74 a 724.00 764.50 247.50 187.50 88.00 61.50 46.00 s 413.00 763.00 1086.50 6436.74
2002 1135.50 856.00 893.00 613.00 495.00 168.50 27.00 118.50 216.00 573.50 791.50 1017.50 6905.00
2003 837.00 883.00 798.50 823.00 468.50 161.00 55.00 111.50 162.50 415.00 933.00 1017.50 6665.50
2004 1115.50 966.00 654.50 601.50 452.00 190.50 46.00 87.50 263.50 601.50 868.00 1053.50 6900.00
2005 1227.27 c 879.00 807.00 685.00 457.50 345.50 16.50 54.50 331.50 533.00 740.00 0.00 z 6076.77
2006 1004.00 875.00 1082.13 d 707.14 b 347.72 a 64.00 r 6.00 y 0.00 z 0.00 z 0.00 z 0.00 z 0.00 z 4015.99
Period of Record Statistics
MEAN 1088.77 893.52 844.77 656.47 454.31 239.25 87.21 116.14 251.73 513.74 802.32 1037.68 6977.66
S.D. 139.23 115.31 98.14 96.85 93.36 58.20 44.55 49.77 71.23 76.95 89.31 115.48 312.93
SKEW 0.56 0.36 0.32 0.55 0.07 0.35 0.55 0.17 0.39 0.06 0.67 0.31 0.35
MAX 1518.00 1206.00 1083.00 912.00 666.00 374.00 205.00 221.00 450.50 646.50 1077.00 1362.00 7538.50
MIN 791.50 611.50 634.35 502.50 244.50 138.62 16.50 12.00 129.00 363.00 611.00 806.50 6318.00
NO YRS 53 54 52 56 54 52 56 54 54 48 50 50 35