HETCH HETCHY, CALIFORNIA

Period of Record General Climate Summary - Growing Degree Days

Station:(043939) HETCH HETCHY
From Year=1931 To Year=2006
Growing Degree Days for Selected Base Temperature (F)
Base	Jan.	Feb.	Mar.	Apr.	May	Jun.	Jul.	Aug.	Sep.	Oct.	Nov.	Dec.	Annual
40 M	55	95	183	313	515	713	965	949	771	525	205	68	5357
40 S	55	150	333	646	1162	1874	2840	3788	4559	5084	5289	5357	5357
45 M	12	35	89	193	369	563	810	794	621	376	102	14	3978
45 S	12	47	135	329	698	1261	2071	2865	3486	3862	3964	3978	3978
50 M	1	8	32	99	237	416	655	639	473	239	36	1	2837
50 S	1	9	41	140	378	794	1449	2088	2560	2800	2836	2837	2837
55 M	0	1	7	38	128	277	500	484	328	127	8	0	1899
55 S	0	1	8	47	175	451	952	1436	1764	1891	1899	1899	1899
60 M	0	0	1	9	53	156	346	331	196	50	1	0	1143
60 S	0	0	1	10	63	219	565	896	1092	1142	1143	1143	1143

Corn Growing Degree Days
50 M	37	72	130	204	317	443	622	609	486	336	136	42	3434
50 S	37	109	239	443	760	1203	1825	2434	2920	3256	3392	3434	3434

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