ST HELENS RFD, OREGON

Period of Record General Climate Summary - Cooling Degree Days

Station:(357466) ST HELENS RFD
From Year=1976 To Year=2012
Cooling Degree Days for Selected Base Temperature (F)
Base	Jan.	Feb.	Mar.	Apr.	May	Jun.	Jul.	Aug.	Sep.	Oct.	Nov.	Dec.	Annual
55	0	1	5	39	126	250	416	429	272	67	2	0	1607
57	0	0	2	24	92	197	355	367	218	42	1	0	1297
60	0	0	0	10	55	129	265	275	146	18	0	0	898
65	0	0	0	1	19	52	138	140	58	3	0	0	410
70	0	0	0	0	4	16	56	53	16	0	0	0	145

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