VASHON ISLAND, WASHINGTON

Period of Record General Climate Summary - Cooling Degree Days

Station:(458802) VASHON ISLAND
From Year=1891 To Year=1955
Cooling Degree Days for Selected Base Temperature (F)
Base	Jan.	Feb.	Mar.	Apr.	May	Jun.	Jul.	Aug.	Sep.	Oct.	Nov.	Dec.	Annual
55	0	0	1	10	46	128	245	241	121	20	1	0	814
57	0	0	0	5	26	83	185	182	79	9	0	0	570
60	0	0	0	1	9	38	104	102	35	3	0	0	293
65	0	0	0	0	1	7	26	24	6	0	0	0	65
70	0	0	0	0	0	1	4	3	1	0	0	0	9

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