RIO VISTA, CALIFORNIA

Period of Record General Climate Summary - Growing Degree Days

Station:(047446) RIO VISTA
From Year=1893 To Year=1977
Growing Degree Days for Selected Base Temperature (F)
Base	Jan.	Feb.	Mar.	Apr.	May	Jun.	Jul.	Aug.	Sep.	Oct.	Nov.	Dec.	Annual
40 M	175	303	412	548	723	918	1058	999	895	721	404	180	7336
40 S	175	478	889	1437	2160	3079	4137	5135	6031	6751	7156	7336	7336
45 M	69	175	260	398	568	768	903	844	745	566	259	71	5626
45 S	69	244	504	902	1470	2238	3141	3985	4730	5296	5555	5626	5626
50 M	19	76	131	252	413	618	748	689	595	411	129	16	4096
50 S	19	95	226	477	890	1508	2256	2945	3540	3951	4080	4096	4096
55 M	3	19	44	124	260	468	593	534	445	259	43	2	2794
55 S	3	22	66	190	450	918	1511	2045	2490	2749	2792	2794	2794
60 M	0	3	6	47	128	320	438	379	296	131	6	0	1754
60 S	0	4	10	56	184	504	942	1321	1617	1748	1754	1754	1754

Corn Growing Degree Days
50 M	65	144	209	308	428	574	662	634	565	433	211	71	4305
50 S	65	209	418	726	1155	1728	2390	3024	3590	4023	4234	4305	4305

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