GRAND CANYON NATL PARK, ARIZONA

Period of Record General Climate Summary - Growing Degree Days

Station:(023595) GRAND CANYON NATL PARK
From Year=1957 To Year=1977
Growing Degree Days for Selected Base Temperature (F)
Base Jan. Feb. Mar. Apr. May Jun. Jul. Aug. Sep. Oct. Nov. Dec. Annual
40 M 8 18 61 168 425 681 898 832 604 316 69 8 4089
40 S 8 26 88 256 681 1362 2260 3092 3696 4012 4081 4089 4089
45 M 1 3 18 75 282 531 743 677 455 186 19 0 2991
45 S 1 4 22 98 380 910 1654 2331 2786 2972 2991 2991 2991
50 M 0 0 1 22 158 383 588 522 308 84 3 0 2069
50 S 0 0 2 23 182 564 1153 1675 1983 2067 2069 2069 2069
55 M 0 0 0 4 63 242 433 367 172 23 0 0 1304
55 S 0 0 0 4 67 309 742 1109 1281 1304 1304 1304 1304
60 M 0 0 0 0 13 125 279 215 65 2 0 0 699
60 S 0 0 0 0 13 138 417 632 696 699 699 699 699
Corn Growing Degree Days
50 M 12 24 66 153 311 450 576 531 383 219 64 18 2807
50 S 12 36 101 255 566 1015 1591 2122 2505 2724 2788 2807 2807
M = Monthly Data
S - Running sum of monthly data.
Growing Degree Day units are computed as the difference between the daily average temperature and the base temperature. (Daily Ave. Temp. - Base Temp.) One unit is accumulated for each degree Fahrenheit the average temperature is above the base temperature. Negative numbers are discarded. Example: If the days high temperature was 95 and the low temperature was 51, the base 60 heating degree day units is ((95 + 51) / 2) - 60 = 13. This is done for each day of the month and summed.
Corn Growing Degree Day units have the limitations that the maximum daily temperatures greater than 86 F are set to 86 F and minimums less than 50 F are set to 50 F.
Table updated on Oct 31, 2012
Months with 5 or more missing days are not considered
Years with 1 or more missing months are not considered

Western Regional Climate Center, wrcc@dri.edu