BRIGHT ANGEL RS, ARIZONA

Period of Record General Climate Summary - Growing Degree Days

Station:(021001) BRIGHT ANGEL RANGER STN
From Year=1925 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	6	16	89	268	502	692	629	431	171	30	5	2840
40 S	2	8	24	113	380	882	1574	2203	2634	2805	2835	2840	2840
45 M	0	1	2	30	145	355	537	474	284	71	6	1	1905
45 S	0	1	4	33	178	533	1070	1544	1828	1898	1904	1905	1905
50 M	0	0	0	7	56	216	382	319	150	18	1	0	1149
50 S	0	0	0	7	64	280	662	981	1131	1148	1149	1149	1149
55 M	0	0	0	1	13	104	229	170	51	2	0	0	570
55 S	0	0	0	1	14	119	347	517	568	570	570	570	570
60 M	0	0	0	0	2	33	95	52	9	0	0	0	191
60 S	0	0	0	0	2	35	130	182	191	191	191	191	191

Corn Growing Degree Days
50 M	4	5	17	74	201	351	441	389	285	139	30	5	1940
50 S	4	9	25	100	300	652	1092	1481	1766	1906	1935	1940	1940

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