CONCORD WWTP, CALIFORNIA

Period of Record General Climate Summary - Heating Degree Days

Station:(041967) CONCORD WASTEWATER PLAN
From Year=1991 To Year=2012
Heating Degree Days for Selected Base Temperature (F)
Base	Jan.	Feb.	Mar.	Apr.	May	Jun.	Jul.	Aug.	Sep.	Oct.	Nov.	Dec.	Annual
65	485	343	259	171	61	13	1	0	4	60	279	481	2156
60	330	203	123	66	10	1	0	0	0	10	146	326	1215
57	239	126	64	29	1	0	0	0	0	2	83	238	781
55	181	82	36	14	0	0	0	0	0	0	52	182	547
50	65	17	4	1	0	0	0	0	0	0	11	67	164

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