POWAY VALLEY, CALIFORNIA

Period of Record General Climate Summary - Growing Degree Days

Station:(047111) POWAY VALLEY
From Year=1893 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	421	421	482	606	721	856	1019	1064	937	768	522	403	8219
40 S	421	842	1324	1930	2651	3507	4526	5590	6526	7294	7816	8219	8219
45 M	271	281	327	456	566	706	864	909	787	613	374	251	6404
45 S	271	552	878	1335	1900	2607	3470	4380	5166	5779	6153	6404	6404
50 M	133	152	181	307	411	556	709	754	637	458	234	121	4652
50 S	133	285	466	773	1184	1740	2449	3203	3839	4297	4531	4652	4652
55 M	41	55	72	166	257	406	554	599	487	305	116	34	3091
55 S	41	96	169	335	591	997	1551	2150	2637	2942	3057	3091	3091
60 M	10	9	18	57	117	257	399	444	337	163	33	4	1847
60 S	10	18	36	94	210	467	866	1310	1647	1810	1843	1847	1847

Corn Growing Degree Days
50 M	262	240	278	357	427	548	676	716	617	492	337	275	5225
50 S	262	502	780	1137	1564	2113	2789	3504	4122	4614	4950	5225	5225

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