OLD FAITHFUL, WYOMING

Period of Record General Climate Summary - Growing Degree Days

Station:(486845) OLD FAITHFUL
From Year=1978 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	0	0	1	19	119	294	517	467	219	39	1	0	1678
40 S	0	0	1	21	140	434	951	1418	1637	1677	1678	1678	1678
45 M	0	0	0	3	46	170	365	315	108	8	0	0	1015
45 S	0	0	0	3	49	219	583	899	1007	1015	1015	1015	1015
50 M	0	0	0	0	9	77	219	175	37	0	0	0	518
50 S	0	0	0	0	9	87	305	480	517	518	518	518	518
55 M	0	0	0	0	1	22	96	65	8	0	0	0	192
55 S	0	0	0	0	1	23	119	185	192	192	192	192	192
60 M	0	0	0	0	0	4	27	13	1	0	0	0	44
60 S	0	0	0	0	0	4	31	44	44	44	44	44	44

Corn Growing Degree Days
50 M	0	2	6	37	113	227	378	365	220	75	5	0	1428
50 S	0	2	7	44	157	384	762	1127	1347	1423	1428	1428	1428

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