RIO VISTA, CALIFORNIA

Period of Record General Climate Summary - Heating Degree Days

Station:(047446) RIO VISTA
From Year=1893 To Year=1977
Heating Degree Days for Selected Base Temperature (F)
Base	Jan.	Feb.	Mar.	Apr.	May	Jun.	Jul.	Aug.	Sep.	Oct.	Nov.	Dec.	Annual
65	608	402	364	214	102	18	2	2	15	102	347	602	2777
60	453	265	215	98	25	1	0	0	1	30	203	447	1738
57	361	187	138	48	7	0	0	0	0	10	129	355	1235
55	300	140	98	26	2	0	0	0	0	3	89	294	953
50	162	55	30	3	0	0	0	0	0	0	25	153	429

Heating Degree Day units are computed as the difference between the base temperature and the daily average temperature. (Base Temp. - Daily Ave. Temp.) One unit is accumulated for each degree Fahrenheit the average temperature is below the base temperature. Negative numbers are discarded. Example: If the days high temperature was 65 and the low temperature was 31, the base 50 heating degree day units is 50 - ((65 + 31) / 2) = 2. 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