DONNER MEM SP, CALIFORNIA

Period of Record General Climate Summary - Growing Degree Days

Station:(042467) DONNER MEMORIAL ST PK
From Year=1953 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	1	2	18	76	246	444	658	629	431	197	32	2	2736
40 S	1	3	21	96	343	786	1444	2073	2504	2701	2734	2736	2736
45 M	0	0	2	24	131	300	503	474	288	89	5	0	1816
45 S	0	0	2	26	156	457	960	1434	1722	1811	1816	1816	1816
50 M	0	0	0	4	53	173	350	322	160	27	0	0	1088
50 S	0	0	0	4	57	230	580	902	1061	1088	1088	1088	1088
55 M	0	0	0	0	13	76	204	179	62	4	0	0	539
55 S	0	0	0	0	14	90	294	473	535	539	539	539	539
60 M	0	0	0	0	2	22	87	68	13	0	0	0	191
60 S	0	0	0	0	2	24	110	179	191	191	191	191	191

Corn Growing Degree Days
50 M	6	16	39	95	217	338	476	466	361	214	59	8	2294
50 S	6	21	60	155	372	710	1186	1652	2013	2227	2286	2294	2294

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