IRON MTN, CALIFORNIA

Period of Record General Climate Summary - Growing Degree Days

Station:(044297) IRON MOUNTAIN
From Year=1935 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	433	516	741	946	1249	1478	1702	1651	1410	1092	676	448	12340
40 S	433	949	1690	2636	3885	5362	7064	8715	10124	11216	11892	12340	12340
45 M	285	376	586	796	1094	1328	1547	1496	1260	937	526	297	10526
45 S	285	661	1247	2043	3137	4465	6012	7507	8767	9703	10229	10526	10526
50 M	154	242	432	646	939	1178	1392	1341	1110	782	378	160	8752
50 S	154	395	827	1473	2412	3590	4981	6322	7432	8213	8592	8752	8752
55 M	58	126	285	497	784	1028	1237	1186	960	627	240	61	7088
55 S	58	184	469	965	1749	2777	4014	5200	6159	6786	7026	7088	7088
60 M	13	49	159	352	629	878	1082	1031	810	474	126	13	5615
60 S	13	62	221	573	1202	2080	3161	4192	5002	5476	5602	5615	5615

Corn Growing Degree Days
50 M	237	296	452	607	803	921	1053	1025	885	703	407	244	7635
50 S	237	534	985	1592	2395	3316	4370	5395	6280	6984	7391	7635	7635

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