PORTERVILLE, CALIFORNIA

Period of Record General Climate Summary - Growing Degree Days

Station:(047077) PORTERVILLE
From Year=1948 To Year=2004
Growing Degree Days for Selected Base Temperature (F)
Base	Jan.	Feb.	Mar.	Apr.	May	Jun.	Jul.	Aug.	Sep.	Oct.	Nov.	Dec.	Annual
40 M	226	346	514	661	904	1087	1294	1243	1056	815	448	229	8824
40 S	226	572	1086	1747	2651	3739	5033	6276	7332	8147	8595	8824	8824
45 M	110	212	360	511	749	937	1139	1088	906	660	301	109	7083
45 S	110	322	682	1193	1942	2880	4019	5106	6013	6673	6974	7083	7083
50 M	40	100	217	363	594	787	984	933	756	506	170	36	5486
50 S	40	140	357	720	1314	2102	3086	4019	4775	5280	5450	5486	5486
55 M	9	32	103	227	440	637	829	778	606	353	74	7	4097
55 S	9	42	144	372	812	1449	2278	3056	3662	4016	4090	4097	4097
60 M	1	6	34	119	295	488	674	623	457	213	22	1	2932
60 S	1	7	41	160	454	942	1616	2239	2696	2909	2931	2932	2932

Corn Growing Degree Days
50 M	123	199	305	404	563	675	793	765	657	511	273	130	5399
50 S	123	323	628	1032	1595	2270	3063	3828	4485	4996	5269	5399	5399

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 Jul 28, 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