PORTOLA, CALIFORNIA

Monthly Total Heating Degree Days

(047085)

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
1915 1029.50 846.00 787.00 632.50 589.00 469.00 219.50 109.00 269.00 514.00 748.50 0.00 z 6213.00
1916 1161.50 941.00 833.50 470.50 573.50 461.50 191.00 343.50 465.50 618.50 744.00 1019.50 7823.50
1917 1188.50 908.50 989.50 539.50 467.00 293.00 15.50 0.00 404.50 0.00 z 717.50 889.50 6413.00
1918 872.50 825.00 890.50 616.50 612.00 303.50 24.50 149.00 262.00 363.00 633.50 1040.50 6592.50
1919 993.50 782.00 855.50 573.50 386.00 402.50 54.00 148.00 255.00 664.50 829.00 1042.50 6986.00
1920 840.00 674.00 702.50 661.50 616.00 347.50 276.00 141.00 313.50 675.50 0.00 z 1084.00 6331.50
1921 1050.00 0.00 z 541.47 a 649.50 0.00 z 125.50 214.93 a 274.00 0.00 z 450.50 655.50 749.50 4710.90
1922 1347.00 1080.50 1136.50 1092.50 816.50 384.50 59.50 319.50 392.00 598.50 838.50 917.50 8983.00
1923 1046.50 0.00 z 791.50 577.50 367.00 298.50 121.50 154.00 161.00 458.50 680.50 1060.00 5716.50
1924 1275.50 769.50 938.00 585.00 316.00 62.50 159.50 411.00 595.50 870.00 919.00 1101.50 8003.00
1925 1010.00 755.50 730.50 467.00 216.00 174.83 a 101.00 286.00 488.00 669.50 823.00 1060.50 6781.83
1926 1096.00 883.00 662.00 521.00 0.00 z 76.50 43.00 0.00 z 0.00 z 0.00 z 759.50 1094.00 5135.00
1927 1202.50 938.50 895.00 799.00 542.50 339.00 121.00 244.50 519.00 e 676.50 760.34 a 1230.18 a 8268.03
1928 1116.00 988.00 762.60 a 769.00 233.00 305.50 136.50 194.50 434.50 907.00 952.50 1257.50 8056.60
1929 728.50 m 508.50 l 895.00 760.00 451.50 280.50 88.50 0.00 z 348.00 539.50 733.00 898.50 4994.50
1930 1256.50 836.00 800.50 687.00 563.00 178.00 177.00 289.00 349.00 658.00 838.00 995.50 7627.50
1931 1081.50 870.50 676.00 484.50 271.25 a 236.50 11.00 95.50 436.50 660.00 874.50 1081.50 6779.25
1932 1171.00 953.00 731.50 733.00 534.00 163.00 0.00 z 163.27 a 274.50 658.50 0.00 z 1325.50 6707.27
1933 1387.00 1275.50 988.00 713.50 686.00 186.00 51.00 167.00 387.00 309.00 772.50 1084.00 8006.50
1934 943.50 802.50 652.50 578.50 478.50 372.50 194.50 0.00 z 0.00 z 497.00 788.00 941.50 6249.00
1935 0.00 z 873.00 1014.00 655.50 450.00 182.50 163.00 124.00 218.00 641.59 c 613.50 i 1111.00 5432.59
1936 963.07 a 742.50 f 789.50 542.00 356.50 f 242.50 100.50 182.50 0.00 z 549.50 820.50 1090.00 5280.07
1937 939.00 l 968.50 855.00 737.50 409.00 280.00 88.00 145.50 291.50 527.50 771.50 988.00 6062.00
1938 1013.00 1069.00 994.50 649.50 478.50 183.00 117.50 147.50 261.50 601.40 a 930.50 966.50 7412.40
1939 1059.50 1142.00 793.00 532.00 450.00 291.00 106.00 88.00 294.00 605.50 793.50 891.00 7045.50
1940 1013.50 887.50 770.00 611.50 353.00 100.50 140.50 90.50 352.50 522.00 889.00 977.53 a 6708.03
1941 994.00 806.50 803.50 746.50 459.50 332.50 88.00 187.50 406.03 a 646.50 780.50 1053.00 7304.03
1942 1173.00 1051.50 920.00 692.00 592.00 283.00 115.00 155.52 a 348.10 a 502.72 a 767.50 1004.50 7604.84
1943 1009.00 866.50 0.00 z 0.00 z 456.50 410.17 a 69.00 270.00 198.00 554.00 767.50 1018.00 5618.67
1944 0.00 z 936.00 938.50 724.50 470.50 357.50 147.00 191.17 a 250.50 491.50 944.00 922.00 6373.17
1945 1048.50 864.00 926.50 681.00 495.00 271.50 0.00 z 0.00 z 0.00 z 453.00 842.50 1051.00 6633.00
1946 1027.50 963.50 850.50 594.50 453.50 350.00 108.50 120.50 326.00 661.50 854.50 951.00 7261.50
1947 1089.50 724.50 767.50 578.50 314.50 259.00 218.50 200.00 231.50 523.50 894.00 1051.50 6852.50
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 1072.50 684.50 350.00 123.50 26.00 105.00 231.00 585.00 808.50 1032.00 6897.00
2007 1130.50 856.50 734.00 642.50 397.50 188.00 46.50 75.50 298.00 589.00 772.00 1154.00 6884.00
2008 1193.50 1065.50 877.00 696.00 453.00 221.50 48.00 35.50 189.00 521.50 716.50 1152.50 7169.50
2009 1023.50 896.00 898.50 666.50 325.00 263.50 63.50 81.50 131.38 a 632.00 774.50 1256.00 7011.88
2010 1019.00 855.50 856.00 779.00 654.50 238.50 44.50 149.50 234.50 474.19 d 877.50 985.50 7168.19
2011 1018.02 c 967.83 e 918.50 732.12 d 591.14 b 264.31 a 99.72 a 89.38 a 111.21 a 155.50 v 890.40 e 1058.59 d 6741.21
2012 956.98 d 901.59 a 875.75 e 594.44 c 273.50 j 112.00 p 59.00 41.85 a 125.00 517.00 732.41 a 1070.50 5874.53
2013 1305.00 917.50 759.00 45.50 z 0.00 z 0.00 z 0.00 z 0.00 z 0.00 z 0.00 z 0.00 z 52.50 z 2981.50
Period of Record Statistics
MEAN 1087.76 899.91 840.87 654.32 461.31 249.93 95.66 136.02 274.67 541.72 802.42 1039.79 7128.37
S.D. 133.19 117.06 105.48 103.92 109.49 79.63 54.39 72.86 94.60 100.76 84.37 113.24 482.84
SKEW 0.55 0.54 0.11 0.94 0.25 0.29 0.79 1.10 0.76 0.70 0.46 0.27 1.41
MAX 1518.00 1275.50 1136.50 1092.50 816.50 469.00 276.00 411.00 595.50 907.00 1077.00 1362.00 8983.00
MIN 791.50 611.50 541.47 467.00 216.00 62.50 11.00 0.00 111.21 309.00 611.00 749.50 6318.00
NO YRS 89 90 91 94 89 91 94 90 89 85 87 89 58