NEEDLES AP, CALIFORNIA

Period of Record General Climate Summary - Growing Degree Days

Station:(046118) NEEDLES FAA AIRPORT
From Year=1948 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	407	499	722	936	1257	1503	1744	1684	1425	1080	646	405	12307
40 S	407	906	1627	2563	3821	5323	7067	8750	10175	11255	11902	12307	12307
45 M	261	360	567	786	1102	1353	1589	1529	1275	925	497	255	10497
45 S	261	620	1187	1973	3075	4428	6016	7545	8820	9745	10242	10497	10497
50 M	135	227	413	636	947	1203	1434	1374	1125	770	350	127	8739
50 S	135	361	774	1410	2357	3560	4993	6367	7492	8262	8612	8739	8739
55 M	48	114	268	487	792	1053	1279	1219	975	616	215	42	7107
55 S	48	163	431	917	1710	2762	4041	5259	6234	6850	7065	7107	7107
60 M	10	41	146	343	637	903	1124	1064	825	463	106	7	5668
60 S	10	51	197	540	1177	2080	3203	4267	5092	5555	5661	5668	5668

Corn Growing Degree Days
50 M	224	290	442	597	804	933	1095	1059	900	698	387	219	7649
50 S	224	514	956	1553	2357	3290	4385	5445	6345	7043	7429	7649	7649

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