TRACY PUMPING PLANT, CALIFORNIA

Period of Record General Climate Summary - Growing Degree Days

Station:(049001) TRACY PUMPING PLANT
From Year=1955 To Year=2005
Growing Degree Days for Selected Base Temperature (F)
Base	Jan.	Feb.	Mar.	Apr.	May	Jun.	Jul.	Aug.	Sep.	Oct.	Nov.	Dec.	Annual
40 M	207	324	483	598	827	971	1131	1118	985	787	429	222	8080
40 S	207	531	1014	1612	2439	3409	4540	5658	6643	7430	7858	8080	8080
45 M	92	187	328	448	672	821	976	963	835	632	281	104	6338
45 S	92	279	607	1055	1727	2548	3524	4487	5322	5953	6234	6338	6338
50 M	28	74	182	300	517	671	821	808	685	477	150	33	4746
50 S	28	103	284	585	1102	1772	2593	3401	4086	4563	4713	4746	4746
55 M	5	16	70	168	363	521	666	653	535	323	57	6	3382
55 S	5	20	91	258	621	1142	1808	2461	2996	3319	3376	3382	3382
60 M	0	1	16	71	221	372	511	498	385	181	12	0	2269
60 S	0	1	18	89	310	682	1193	1691	2076	2257	2269	2269	2269

Corn Growing Degree Days
50 M	87	162	262	346	501	604	703	704	629	484	228	96	4805
50 S	87	248	510	856	1357	1961	2665	3368	3997	4481	4709	4805	4805

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 Apr 5, 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