Y LIGHTNING RCH, ARIZONA

Period of Record General Climate Summary - Heating Degree Days

Station:(029562) Y LIGHTNING RANCH
From Year=1939 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	424	419	247	81	23	0	0	0	3	53	321	646	2218
60	269	276	129	36	7	0	0	0	0	16	192	493	1416
57	177	192	84	25	1	0	0	0	0	5	123	405	1011
55	124	144	60	19	0	0	0	0	0	1	86	347	780
50	39	59	24	8	0	0	0	0	0	0	29	216	374

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