GROTTO, WASHINGTON

Period of Record General Climate Summary - Heating Degree Days

Station:(453386) GROTTO
From Year=1955 To Year=1969
Heating Degree Days for Selected Base Temperature (F)
Base	Jan.	Feb.	Mar.	Apr.	May	Jun.	Jul.	Aug.	Sep.	Oct.	Nov.	Dec.	Annual
65	926	720	708	516	333	183	91	100	202	437	703	864	5781
60	771	578	553	367	196	76	22	24	88	287	553	709	4224
57	678	494	460	280	128	34	5	6	42	205	463	616	3409
55	616	437	398	225	91	18	1	2	23	155	403	554	2922
50	461	298	251	101	26	2	0	0	3	64	258	399	1863

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