SAN RAFAEL RCH SP, ARIZONA

Period of Record General Climate Summary - Growing Degree Days

Station:(027555) SAN RAFAEL RANCH
From Year=1892 To Year=2009
Growing Degree Days for Selected Base Temperature (F)
Base Jan. Feb. Mar. Apr. May Jun. Jul. Aug. Sep. Oct. Nov. Dec. Annual
40 M 126 147 255 400 656 938 1054 1000 862 635 306 152 6530
40 S 126 273 528 928 1584 2521 3575 4575 5437 6072 6377 6530 6530
45 M 45 63 131 254 501 788 899 845 712 480 173 56 4946
45 S 45 108 239 492 994 1781 2680 3525 4237 4717 4889 4946 4946
50 M 6 16 42 127 350 638 744 690 562 327 72 9 3583
50 S 6 23 65 192 542 1179 1923 2613 3175 3502 3574 3583 3583
55 M 0 2 7 41 210 488 589 535 412 187 15 0 2486
55 S 0 2 9 50 260 748 1337 1872 2284 2471 2486 2486 2486
60 M 0 0 1 8 96 339 434 380 264 79 1 0 1603
60 S 0 0 1 9 105 445 878 1258 1522 1602 1603 1603 1603
Corn Growing Degree Days
50 M 179 186 267 344 493 588 678 657 546 458 290 209 4896
50 S 179 365 632 976 1469 2056 2735 3392 3938 4397 4687 4896 4896
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