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Period of Record General Climate Summary - Heating Degree Days

Station:(440385) BACK BAY WILDLIFE REFUG
From Year=1953 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	767	652	497	245	72	4	0	0	5	103	331	626	3303
60	612	512	352	138	22	0	0	0	0	39	203	473	2354
57	521	430	273	88	9	0	0	0	0	19	140	386	1867
55	462	377	223	62	4	0	0	0	0	11	105	330	1576
50	322	254	121	19	0	0	0	0	0	2	44	207	970

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