CASTLE ROCK, COLORADO

Period of Record General Climate Summary - Heating Degree Days

Station:(051401) CASTLE ROCK
From Year=1893 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	1110	972	867	609	351	109	19	31	188	513	821	1116	6706
60	955	831	712	461	217	43	4	6	94	362	671	961	5315
57	862	746	620	375	152	21	1	2	58	279	581	868	4565
55	800	689	559	321	116	13	0	1	41	228	522	806	4097
50	646	549	412	200	54	3	0	0	17	127	380	652	3040

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