VACAVILLE, CALIFORNIA

Period of Record General Climate Summary - Growing Degree Days

Station:(049200) VACAVILLE
From Year=1948 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	191	303	450	570	791	953	1116	1082	955	749	406	208	7773
40 S	191	494	943	1514	2305	3258	4374	5456	6411	7160	7566	7773	7773
45 M	80	170	296	420	636	803	961	927	805	594	260	92	6044
45 S	80	250	546	966	1603	2406	3367	4294	5099	5693	5952	6044	6044
50 M	22	66	157	275	481	653	806	772	655	439	133	26	4485
50 S	22	88	245	519	1001	1654	2460	3232	3887	4326	4459	4485	4485
55 M	3	14	58	148	328	503	651	617	505	287	47	4	3167
55 S	3	17	75	224	552	1055	1706	2323	2828	3115	3163	3167	3167
60 M	0	1	15	61	190	354	496	462	355	153	10	0	2098
60 S	0	1	16	77	267	621	1117	1580	1935	2088	2098	2098	2098

Corn Growing Degree Days
50 M	87	165	263	354	488	580	658	643	582	469	232	98	4619
50 S	87	252	515	869	1357	1936	2595	3238	3820	4289	4521	4619	4619

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