YREKA, CALIFORNIA

Period of Record General Climate Summary - Growing Degree Days

Station:(049866) YREKA
From Year=1893 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	18	49	140	275	511	718	983	951	698	396	98	22	4860
40 S	18	67	207	483	994	1712	2696	3646	4344	4740	4838	4860	4860
45 M	2	10	56	156	361	569	828	796	548	252	34	4	3616
45 S	2	13	68	224	585	1153	1982	2778	3326	3578	3612	3616	3616
50 M	0	1	15	72	227	421	673	641	400	134	8	0	2593
50 S	0	1	16	88	315	736	1409	2050	2451	2585	2592	2593	2593
55 M	0	0	2	24	124	282	519	486	262	55	1	0	1755
55 S	0	0	2	26	149	431	950	1436	1699	1754	1755	1755	1755
60 M	0	0	0	5	56	163	367	335	145	17	0	0	1087
60 S	0	0	0	5	61	224	590	925	1071	1087	1087	1087	1087

Corn Growing Degree Days
50 M	13	46	120	209	350	457	593	576	458	301	80	12	3212
50 S	13	58	178	387	737	1193	1786	2362	2820	3120	3200	3212	3212

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