PETRIFIED FOREST NP, ARIZONA

Period of Record General Climate Summary - Growing Degree Days

Station:(026468) PETRIFIED FOREST N P
From Year=1931 To Year=2012
Growing Degree Days for Selected Base Temperature (F)
Base Jan. Feb. Mar. Apr. May Jun. Jul. Aug. Sep. Oct. Nov. Dec. Annual
40 M 27 71 198 394 664 926 1130 1069 840 511 156 33 6018
40 S 27 98 295 689 1353 2279 3409 4478 5318 5829 5985 6018 6018
45 M 5 20 94 256 510 776 975 914 690 362 69 7 4677
45 S 5 25 119 375 885 1661 2636 3549 4239 4601 4670 4677 4677
50 M 0 3 31 138 359 626 820 759 540 225 20 1 3522
50 S 0 4 34 172 532 1158 1977 2736 3276 3501 3521 3522 3522
55 M 0 0 6 55 219 476 665 604 391 111 3 0 2529
55 S 0 0 6 61 280 756 1421 2025 2415 2526 2529 2529 2529
60 M 0 0 0 13 104 328 510 449 246 37 0 0 1686
60 S 0 0 0 13 117 445 955 1404 1650 1686 1686 1686 1686
Corn Growing Degree Days
50 M 40 87 188 304 451 579 716 694 543 355 149 49 4154
50 S 40 126 314 618 1070 1648 2364 3058 3602 3956 4105 4154 4154
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