GRAND CANYON HQ, ARIZONA

Period of Record General Climate Summary - Growing Degree Days

Station:(023591) GRAND CANYON NATL PARK
From Year=1903 To Year=1957
Growing Degree Days for Selected Base Temperature (F)
Base Jan. Feb. Mar. Apr. May Jun. Jul. Aug. Sep. Oct. Nov. Dec. Annual
40 M 6 15 62 217 453 717 906 839 647 327 82 14 4286
40 S 6 21 84 301 753 1471 2377 3216 3863 4190 4272 4286 4286
45 M 1 2 15 112 308 567 751 684 497 195 25 1 3160
45 S 1 2 17 130 438 1005 1757 2441 2938 3133 3159 3160 3160
50 M 0 0 2 42 180 419 596 529 350 92 4 0 2215
50 S 0 0 2 44 224 643 1239 1768 2118 2210 2215 2215 2215
55 M 0 0 0 9 82 276 441 374 210 29 1 0 1422
55 S 0 0 0 9 91 367 808 1182 1392 1421 1422 1422 1422
60 M 0 0 0 1 22 153 288 223 92 4 0 0 783
60 S 0 0 0 1 22 175 464 686 779 783 783 783 783
Corn Growing Degree Days
50 M 9 19 64 170 311 474 580 533 407 230 78 21 2896
50 S 9 28 92 262 573 1047 1627 2160 2567 2797 2875 2896 2896
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