GRAND CANYON NTL PRK, ARIZONA

Period of Record General Climate Summary - Growing Degree Days

Station:(023595) GRAND CANYON NATL PARK
From Year=1957 To Year=1977
Growing Degree Days for Selected Base Temperature (F)
Base	Jan.	Feb.	Mar.	Apr.	May	Jun.	Jul.	Aug.	Sep.	Oct.	Nov.	Dec.	Annual
40 M	8	18	61	168	425	681	898	832	604	316	69	8	4089
40 S	8	26	88	256	681	1362	2260	3092	3696	4012	4081	4089	4089
45 M	1	3	18	75	282	531	743	677	455	186	19	0	2991
45 S	1	4	22	98	380	910	1654	2331	2786	2972	2991	2991	2991
50 M	0	0	1	22	158	383	588	522	308	84	3	0	2069
50 S	0	0	2	23	182	564	1153	1675	1983	2067	2069	2069	2069
55 M	0	0	0	4	63	242	433	367	172	23	0	0	1304
55 S	0	0	0	4	67	309	742	1109	1281	1304	1304	1304	1304
60 M	0	0	0	0	13	125	279	215	65	2	0	0	699
60 S	0	0	0	0	13	138	417	632	696	699	699	699	699

Corn Growing Degree Days
50 M	12	24	66	153	311	450	576	531	383	219	64	18	2807
50 S	12	36	101	255	566	1015	1591	2122	2505	2724	2788	2807	2807

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