RITZVILLE 1 SSE, WASHINGTON

Period of Record General Climate Summary - Growing Degree Days

Station:(457059) RITZVILLE
From Year=1899 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	5	15	83	236	475	673	937	906	633	305	43	8	4320
40 S	5	21	104	340	815	1488	2425	3331	3964	4269	4312	4320	4320
45 M	1	3	26	124	326	523	782	751	484	177	11	1	3207
45 S	1	3	29	153	479	1002	1784	2535	3018	3196	3206	3207	3207
50 M	0	0	6	55	196	375	627	596	340	86	1	0	2284
50 S	0	0	6	62	258	633	1260	1856	2196	2282	2283	2284	2284
55 M	0	0	1	20	102	238	473	442	212	34	0	0	1522
55 S	0	0	1	20	123	361	833	1275	1488	1522	1522	1522	1522
60 M	0	0	0	5	44	130	324	295	113	10	0	0	921
60 S	0	0	0	5	49	180	503	798	911	921	921	921	921

Corn Growing Degree Days
50 M	1	7	57	167	311	423	580	564	402	202	21	2	2736
50 S	1	8	65	232	543	966	1546	2110	2512	2714	2735	2736	2736

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