HALEAKALA SUMMIT 338, HAWAII

Period of Record General Climate Summary - Heating Degree Days

Station:(511008) HALEAKALA SUMMIT 338
From Year=1957 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	673	640	667	603	558	443	480	457	445	494	552	647	6660
60	518	499	512	453	403	293	325	302	295	339	402	492	4834
57	425	414	419	363	310	204	232	210	205	247	312	399	3740
55	364	357	357	303	248	147	172	150	147	186	252	337	3021
50	215	221	206	159	104	38	49	35	36	58	113	186	1417

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