FORT COLLINS, COLORADO

Period of Record General Climate Summary - Growing Degree Days

Station:(053005) FORT COLLINS
From Year=1900 To Year=2006
Growing Degree Days for Selected Base Temperature (F)
Base	Jan.	Feb.	Mar.	Apr.	May	Jun.	Jul.	Aug.	Sep.	Oct.	Nov.	Dec.	Annual
40 M	13	23	86	238	483	742	947	891	606	307	66	15	4415
40 S	13	36	121	359	842	1584	2531	3421	4027	4334	4400	4415	4415
45 M	3	6	33	131	336	592	792	736	459	180	21	3	3291
45 S	3	9	42	172	508	1100	1892	2628	3087	3267	3288	3291	3291
50 M	0	1	9	56	204	443	637	581	318	82	4	1	2335
50 S	0	2	10	66	270	713	1350	1931	2249	2331	2334	2335	2335
55 M	0	0	1	16	99	299	482	426	189	25	0	0	1539
55 S	0	0	2	17	116	416	897	1323	1513	1538	1539	1539	1539
60 M	0	0	0	2	33	170	328	273	86	4	0	0	897
60 S	0	0	0	2	35	205	533	806	893	897	897	897	897

Corn Growing Degree Days
50 M	25	37	91	178	301	459	606	569	391	234	81	29	3000
50 S	25	62	153	331	631	1090	1696	2265	2656	2890	2971	3000	3000

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 Jul 28, 2006
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