RIFLE, COLORADO

Period of Record General Climate Summary - Growing Degree Days

Station:(057031) RIFLE
From Year=1910 To Year=2004
Growing Degree Days for Selected Base Temperature (F)
Base	Jan.	Feb.	Mar.	Apr.	May	Jun.	Jul.	Aug.	Sep.	Oct.	Nov.	Dec.	Annual
40 M	0	7	72	250	507	738	963	899	613	294	39	2	4385
40 S	0	8	80	329	837	1575	2538	3437	4050	4344	4383	4385	4385
45 M	0	1	21	134	357	588	808	744	464	163	9	0	3288
45 S	0	1	22	156	512	1101	1909	2653	3116	3279	3288	3288	3288
50 M	0	0	4	53	218	439	653	589	318	66	1	0	2340
50 S	0	0	4	57	274	713	1366	1955	2273	2339	2340	2340	2340
55 M	0	0	0	13	103	294	498	434	183	15	0	0	1541
55 S	0	0	0	13	117	410	908	1342	1526	1541	1541	1541	1541
60 M	0	0	0	1	31	162	343	280	76	1	0	0	894
60 S	0	0	0	1	32	194	537	817	893	894	894	894	894

Corn Growing Degree Days
50 M	2	18	94	218	371	492	598	571	438	271	72	7	3153
50 S	2	20	113	332	703	1195	1793	2364	2803	3074	3146	3153	3153

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