CASTLE ROCK, COLORADO

Period of Record General Climate Summary - Growing Degree Days

Station:(051401) CASTLE ROCK
From Year=1893 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	18	23	86	198	435	693	895	835	584	293	85	20	4166
40 S	18	41	127	325	760	1453	2348	3184	3768	4061	4146	4166	4166
45 M	4	6	34	103	294	544	740	680	439	171	34	5	3054
45 S	4	9	43	147	440	984	1724	2405	2844	3015	3049	3054	3054
50 M	0	1	10	42	172	396	585	526	299	80	9	1	2120
50 S	0	1	11	53	224	620	1205	1731	2030	2110	2119	2120	2120
55 M	0	0	2	12	79	256	431	371	173	26	1	0	1351
55 S	0	0	2	14	92	348	779	1150	1323	1349	1351	1351	1351
60 M	0	0	0	2	24	136	279	221	76	5	0	0	743
60 S	0	0	0	2	26	162	441	662	738	743	743	743	743

Corn Growing Degree Days
50 M	37	41	100	172	302	445	565	533	403	256	108	41	3003
50 S	37	78	177	349	651	1097	1661	2195	2598	2854	2962	3003	3003

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