RIO VISTA, CALIFORNIA

Period of Record General Climate Summary - Cooling Degree Days

Station:(047446) RIO VISTA
From Year=1893 To Year=1977
Cooling Degree Days for Selected Base Temperature (F)
Base	Jan.	Feb.	Mar.	Apr.	May	Jun.	Jul.	Aug.	Sep.	Oct.	Nov.	Dec.	Annual
55	3	19	44	124	260	468	593	534	445	259	43	2	2794
57	1	10	22	86	203	409	531	472	386	203	23	1	2347
60	0	3	6	47	128	320	438	379	296	131	6	0	1754
65	0	1	0	12	50	186	285	226	160	48	0	0	968
70	0	0	0	2	15	93	154	100	65	10	0	0	438

Cooling 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.
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