MT SHASTA, CALIFORNIA

Period of Record General Climate Summary - Growing Degree Days

Station:(045983) MOUNT SHASTA
From Year=1948 To Year=2010
Growing Degree Days for Selected Base Temperature (F)
Base	Jan.	Feb.	Mar.	Apr.	May	Jun.	Jul.	Aug.	Sep.	Oct.	Nov.	Dec.	Annual
40 M	18	42	96	208	428	630	857	811	617	348	90	20	4166
40 S	18	60	156	364	792	1422	2279	3090	3707	4056	4145	4166	4166
45 M	2	9	33	108	285	481	702	656	468	212	31	3	2989
45 S	2	10	43	151	436	917	1620	2275	2743	2956	2986	2989	2989
50 M	0	1	7	43	165	337	548	501	323	105	6	0	2036
50 S	0	1	8	51	216	552	1100	1601	1924	2030	2036	2036	2036
55 M	0	0	1	11	78	206	394	348	194	39	1	0	1272
55 S	0	0	1	11	90	296	690	1038	1232	1271	1272	1272	1272
60 M	0	0	0	1	28	104	246	205	91	10	0	0	684
60 S	0	0	0	1	29	132	378	583	674	684	684	684	684

Corn Growing Degree Days
50 M	14	36	78	153	277	397	541	514	405	238	63	16	2732
50 S	14	50	128	281	558	955	1496	2010	2415	2653	2716	2732	2732

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