FLAGSTAFF PULLIAM AP, ARIZONA

Period of Record General Climate Summary - Growing Degree Days

Station:(023010) FLAGSTAFF WSO AP
From Year=1893 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 2 7 37 141 351 596 817 757 532 246 46 6 3538
40 S 2 9 46 188 539 1134 1951 2708 3240 3486 3532 3538 3538
45 M 0 0 6 54 212 446 662 602 383 123 9 0 2498
45 S 0 1 6 61 273 719 1381 1983 2365 2489 2497 2498 2498
50 M 0 0 0 13 99 301 507 447 238 40 1 0 1645
50 S 0 0 0 13 112 413 919 1366 1604 1644 1645 1645 1645
55 M 0 0 0 2 30 169 352 293 111 6 0 0 962
55 S 0 0 0 2 31 200 552 845 956 962 962 962 962
60 M 0 0 0 0 5 72 199 144 28 0 0 0 449
60 S 0 0 0 0 5 77 276 420 448 449 449 449 449
Corn Growing Degree Days
50 M 13 24 64 148 282 421 522 475 357 215 77 23 2619
50 S 13 37 101 249 530 951 1473 1948 2305 2520 2597 2619 2619
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