YREKA, CALIFORNIA

Period of Record General Climate Summary - Growing Degree Days

Station:(049866) YREKA
From Year=1948 To Year=2005
Growing Degree Days for Selected Base Temperature (F)
Base	Jan.	Feb.	Mar.	Apr.	May	Jun.	Jul.	Aug.	Sep.	Oct.	Nov.	Dec.	Annual
40 M	18	52	137	272	510	720	979	943	706	402	97	20	4856
40 S	18	70	206	478	988	1708	2688	3631	4337	4739	4836	4856	4856
45 M	3	11	53	154	360	570	824	788	556	259	34	4	3617
45 S	3	14	67	221	581	1151	1976	2764	3320	3579	3613	3617	3617
50 M	0	1	13	72	228	423	669	633	408	142	8	0	2598
50 S	0	1	15	87	315	738	1407	2041	2449	2590	2598	2598	2598
55 M	0	0	2	24	125	285	515	479	269	62	1	0	1762
55 S	0	0	2	26	151	436	951	1430	1700	1761	1762	1762	1762
60 M	0	0	0	5	56	168	364	328	151	19	0	0	1091
60 S	0	0	0	5	61	229	592	921	1072	1091	1091	1091	1091

Corn Growing Degree Days
50 M	13	48	116	203	345	454	592	570	459	303	77	11	3192
50 S	13	61	177	380	726	1180	1771	2341	2801	3104	3181	3192	3192

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 Apr 5, 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