SAINT JOHNS, ARIZONA

Period of Record General Climate Summary - Heating Degree Days

Station:(027435) SAINT JOHNS
From Year=1901 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	991	758	648	395	175	23	0	1	51	335	684	978	5039
60	836	617	493	252	77	4	0	0	12	195	534	823	3843
57	743	532	401	176	42	1	0	0	4	127	444	730	3201
55	681	476	341	133	28	1	0	0	2	91	385	668	2805
50	526	337	204	57	8	0	0	0	0	34	244	513	1923

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