SPEARMAN, TEXAS

Period of Record General Climate Summary - Growing Degree Days

Station:(418523) SPEARMAN
From Year=1920 To Year=2003
Growing Degree Days for Selected Base Temperature (F)
Base	Jan.	Feb.	Mar.	Apr.	May	Jun.	Jul.	Aug.	Sep.	Oct.	Nov.	Dec.	Annual
40 M	69	116	272	518	799	1057	1244	1197	931	614	228	83	7129
40 S	69	186	458	976	1776	2833	4077	5273	6204	6818	7046	7129	7129
45 M	26	55	167	380	645	907	1089	1042	781	464	131	32	5719
45 S	26	82	249	628	1273	2180	3270	4311	5092	5556	5687	5719	5719
50 M	8	20	88	252	493	757	934	887	632	323	62	9	4465
50 S	8	28	116	368	860	1617	2552	3438	4071	4393	4456	4465	4465
55 M	1	5	38	145	347	607	779	732	485	199	22	2	3363
55 S	1	7	45	190	537	1145	1924	2655	3141	3339	3361	3363	3363
60 M	0	1	12	68	216	458	624	577	344	102	5	0	2408
60 S	0	1	13	81	297	755	1380	1957	2301	2403	2408	2408	2408

Corn Growing Degree Days
50 M	85	118	223	350	501	677	796	770	596	403	184	92	4796
50 S	85	203	426	776	1277	1954	2750	3520	4116	4519	4704	4796	4796

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