GRAND CANYON NATL PARK, ARIZONA

Monthly Total Heating Degree Days

(023595)

Base Temperature = 65 F

File last updated on Apr 3, 2013
*** Note *** Provisional Data *** After Year/Month 197707
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
1957 0.00 z 0.00 z 0.00 z 0.00 z 0.00 z 0.00 z 0.00 z 51.50 m 162.00 550.00 934.50 898.50 2545.00
1958 1050.50 803.00 992.00 669.50 251.50 46.00 g 8.00 1.50 161.00 425.50 803.50 855.00 6021.00
1959 1020.50 963.50 808.00 497.00 361.00 35.50 0.00 a 17.00 176.00 427.50 778.00 993.00 6077.00
1960 1225.50 1090.50 759.00 514.00 314.50 47.50 0.50 10.00 89.50 543.50 770.50 1058.50 6423.50
1961 995.50 815.00 840.50 580.00 345.50 66.50 4.50 30.50 239.00 509.50 857.00 1136.50 6420.00
1962 1058.50 863.50 980.00 437.59 a 404.00 130.00 9.50 4.50 95.50 410.00 658.50 985.00 6036.59
1963 1158.00 740.00 851.50 670.00 251.10 a 141.00 0.00 22.00 91.50 333.00 713.00 976.00 5947.10
1964 1146.50 1027.00 963.50 652.00 370.50 116.50 0.00 21.00 148.00 325.00 874.50 1016.50 6661.00
1965 955.00 902.50 904.50 692.00 465.50 240.50 18.00 40.50 274.00 383.50 736.00 1033.50 6645.50
1966 1161.98 a 1071.00 739.00 527.00 232.50 70.50 0.50 3.00 88.50 451.00 709.50 1043.50 6097.98
1967 1027.00 795.00 708.50 691.00 383.00 193.00 0.50 3.44 d 117.78 c 382.69 b 673.50 1209.50 6184.91
1968 1053.50 780.00 807.00 708.50 0.00 z 123.00 8.00 113.00 222.50 451.00 820.50 1134.50 6221.50
1969 967.50 976.00 1003.50 598.50 323.50 168.50 19.00 6.50 153.00 631.00 820.50 956.50 6624.00
1970 1060.00 782.50 927.00 769.50 350.00 149.00 33.50 11.50 201.50 546.50 675.50 1036.50 6543.00
1971 994.50 897.50 835.50 618.50 452.00 124.00 7.00 21.00 148.33 c 630.33 a 864.50 1168.00 6761.17
1972 1008.00 803.50 611.50 555.52 a 323.00 157.00 0.00 g 41.91 d 152.00 f 555.42 a 912.00 1144.50 6112.34
1973 1169.50 911.00 1014.00 699.83 a 315.17 a 122.00 2.21 c 21.00 i 151.03 a 454.67 a 777.93 a 927.00 6544.34
1974 1107.45 b 902.74 a 701.50 617.00 255.50 68.00 16.00 32.11 c 148.45 a 16.50 z 85.00 z 1105.50 4954.24
1975 1044.50 959.50 932.50 804.00 461.50 104.40 e 1.50 f 27.79 b 126.60 e 332.00 j 523.00 h 645.50 i 4460.79
1976 547.50 m 808.65 c 892.00 645.00 0.00 z 124.66 a 13.50 21.00 196.55 a 526.50 725.50 960.00 4913.36
1977 1092.50 782.50 904.34 b 523.97 a 507.00 80.00 8.50 0.00 z 0.00 z 0.00 z 0.00 z 0.00 z 3898.81
Period of Record Statistics
MEAN 1068.23 883.74 858.77 623.52 353.71 119.03 8.29 23.79 157.41 474.26 783.61 1033.58 6368.48
S.D. 75.51 103.65 113.03 94.79 80.90 51.24 8.99 25.58 52.02 92.12 83.45 96.74 285.65
SKEW 0.45 0.56 -0.46 -0.07 0.26 0.43 1.28 2.44 0.53 0.10 0.18 0.07 -0.14
MAX 1225.50 1090.50 1014.00 804.00 507.00 240.50 33.50 113.00 274.00 631.00 934.50 1209.50 6761.17
MIN 955.00 740.00 611.50 437.59 232.50 35.50 0.00 1.50 88.50 325.00 658.50 855.00 5947.10
NO YRS 19 20 20 20 18 19 18 18 19 18 18 19 12