STOCKTON METRO AP, CALIFORNIA

Period of Record General Climate Summary - Growing Degree Days

Station:(048558) STOCKTON WSO
From Year=1948 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	187	298	442	582	816	980	1156	1122	980	753	399	191	7906
40 S	187	485	927	1509	2326	3306	4462	5584	6564	7316	7716	7906	7906
45 M	79	165	288	432	661	830	1001	967	830	598	254	81	6186
45 S	79	244	532	964	1625	2456	3456	4424	5254	5851	6105	6186	6186
50 M	22	63	148	286	506	680	846	812	680	443	129	24	4640
50 S	22	85	234	520	1026	1706	2552	3364	4044	4487	4616	4640	4640
55 M	4	13	52	155	353	530	691	657	530	290	45	4	3324
55 S	4	17	69	224	577	1107	1798	2455	2985	3276	3321	3324	3324
60 M	0	1	10	63	210	381	536	502	380	154	8	0	2246
60 S	0	1	11	74	284	665	1201	1703	2083	2237	2245	2246	2246

Corn Growing Degree Days
50 M	77	154	250	347	496	608	713	699	615	462	221	83	4726
50 S	77	232	482	828	1325	1933	2645	3344	3960	4421	4642	4726	4726

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