GRAND CANYON NTL PRK, ARIZONA

Period of Record General Climate Summary - Heating Degree Days

Station:(023595) GRAND CANYON NATL PARK
From Year=1957 To Year=1977
Heating Degree Days for Selected Base Temperature (F)
Base	Jan.	Feb.	Mar.	Apr.	May	Jun.	Jul.	Aug.	Sep.	Oct.	Nov.	Dec.	Annual
65	1068	884	859	624	354	119	8	24	157	474	784	1034	6388
60	913	742	704	474	210	45	1	3	61	321	634	879	4986
57	820	658	611	384	141	21	0	1	30	237	544	786	4231
55	758	601	549	327	106	12	0	0	18	187	484	724	3765
50	603	460	395	195	46	2	0	0	4	93	336	569	2704

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