HAYFIELD RESERVOIR, CALIFORNIA

Period of Record General Climate Summary - Growing Degree Days

Station:(043855) HAYFIELD RESERVOIR
From Year=1948 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	381	452	627	810	1077	1292	1540	1506	1279	981	603	395	10943
40 S	381	833	1461	2270	3348	4639	6179	7685	8964	9945	10548	10943	10943
45 M	237	314	473	660	922	1142	1385	1351	1129	826	453	248	9140
45 S	237	551	1024	1684	2606	3748	5133	6484	7613	8439	8892	9140	9140
50 M	118	186	323	510	767	992	1230	1196	979	671	308	124	7405
50 S	118	304	628	1138	1905	2897	4126	5322	6301	6972	7280	7405	7405
55 M	43	88	189	365	612	842	1075	1041	829	517	178	43	5822
55 S	43	131	320	685	1297	2139	3213	4255	5084	5601	5779	5822	5822
60 M	11	30	89	232	459	692	920	886	679	367	80	9	4453
60 S	11	40	129	361	820	1512	2432	3318	3997	4364	4444	4453	4453

Corn Growing Degree Days
50 M	246	285	392	508	677	789	946	932	791	615	385	260	6826
50 S	246	531	924	1431	2108	2897	3843	4775	5567	6182	6566	6826	6826

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