MOUNT HAMILTON, CALIFORNIA

Period of Record General Climate Summary - Growing Degree Days

Station:(045933) MOUNT HAMILTON
From Year=1948 To Year=2006
Growing Degree Days for Selected Base Temperature (F)
Base	Jan.	Feb.	Mar.	Apr.	May	Jun.	Jul.	Aug.	Sep.	Oct.	Nov.	Dec.	Annual
40 M	147	140	165	259	460	689	958	933	784	565	274	163	5537
40 S	147	287	452	711	1171	1860	2818	3751	4535	5100	5373	5537	5537
45 M	74	70	86	160	324	542	803	778	635	419	165	82	4136
45 S	74	144	229	389	713	1254	2057	2835	3469	3888	4053	4136	4136
50 M	32	29	38	86	209	401	648	623	488	288	87	34	2963
50 S	32	61	99	185	394	795	1443	2066	2555	2843	2930	2963	2963
55 M	11	9	13	39	120	276	494	472	350	179	37	10	2011
55 S	11	20	33	72	192	468	963	1434	1785	1963	2001	2011	2011
60 M	2	2	3	13	60	170	347	328	229	96	11	2	1263
60 S	2	4	7	20	80	250	598	925	1154	1250	1261	1263	1263

Corn Growing Degree Days
50 M	51	52	65	125	252	426	645	623	498	313	115	57	3224
50 S	51	103	168	294	546	971	1617	2240	2738	3051	3167	3224	3224

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 Jul 28, 2006
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