SAN JON, NEW MEXICO

Period of Record General Climate Summary - Heating Degree Days

Station:(297867) SAN JON
From Year=1907 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	831	654	499	237	75	7	0	1	28	202	532	817	3881
60	676	513	356	135	30	2	0	0	10	108	389	663	2882
57	584	431	279	90	16	1	0	0	5	69	309	571	2354
55	524	379	232	67	10	0	0	0	3	50	260	511	2035
50	381	258	136	28	3	0	0	0	1	20	157	367	1351

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