SAN JON, NEW MEXICO

Period of Record General Climate Summary - Growing Degree Days

Station:(297867) SAN JON
From Year=1907 To Year=2012
Growing Degree Days for Selected Base Temperature (F)
Base	Jan.	Feb.	Mar.	Apr.	May	Jun.	Jul.	Aug.	Sep.	Oct.	Nov.	Dec.	Annual
40 M	99	141	312	541	824	1081	1222	1167	930	612	258	100	7287
40 S	99	240	552	1093	1917	2998	4220	5387	6317	6929	7188	7287	7287
45 M	43	71	195	398	669	931	1067	1012	780	463	153	43	5826
45 S	43	114	309	707	1377	2308	3375	4387	5167	5630	5783	5826	5826
50 M	15	28	104	267	516	781	912	857	631	320	76	15	4523
50 S	15	43	148	414	930	1711	2623	3481	4112	4432	4508	4523	4523
55 M	3	8	45	155	368	631	757	702	483	195	30	3	3381
55 S	3	11	56	211	580	1211	1968	2670	3153	3348	3377	3381	3381
60 M	0	1	15	73	234	482	602	547	340	99	8	0	2401
60 S	0	1	16	89	323	806	1408	1955	2295	2393	2401	2401	2401

Corn Growing Degree Days
50 M	106	135	246	367	525	686	789	759	602	404	205	102	4928
50 S	106	242	488	854	1380	2066	2855	3614	4216	4621	4826	4928	4928

M = Monthly Data
S - Running sum of monthly data.
Growing Degree Day units are computed as the difference between the daily average temperature and the base temperature. (Daily Ave. Temp. - Base Temp.) One unit is accumulated for each degree Fahrenheit the average temperature is above the base temperature. Negative numbers are discarded. Example: If the days high temperature was 95 and the low temperature was 51, the base 60 heating degree day units is ((95 + 51) / 2) - 60 = 13. This is done for each day of the month and summed.
Corn Growing Degree Day units have the limitations that the maximum daily temperatures greater than 86 F are set to 86 F and minimums less than 50 F are set to 50 F.
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