OMAK AP, WASHINGTON

Period of Record General Climate Summary - Growing Degree Days

Station:(456123) OMAK 2 NW
From Year=1909 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	1	5	89	306	570	762	999	945	636	286	30	2	4631
40 S	1	6	95	401	971	1733	2731	3677	4313	4599	4629	4631	4631
45 M	0	1	29	175	415	612	844	790	486	162	5	0	3519
45 S	0	1	29	204	619	1231	2075	2865	3352	3513	3519	3519	3519
50 M	0	0	6	80	268	462	689	635	340	72	0	0	2554
50 S	0	0	6	87	355	817	1506	2141	2481	2553	2554	2554	2554
55 M	0	0	1	27	146	315	534	481	206	24	0	0	1733
55 S	0	0	1	27	173	488	1022	1503	1709	1733	1733	1733	1733
60 M	0	0	0	6	61	181	381	329	102	6	0	0	1066
60 S	0	0	0	6	68	249	630	959	1061	1066	1066	1066	1066

Corn Growing Degree Days
50 M	1	3	71	214	370	477	621	591	416	197	14	1	2975
50 S	1	4	75	289	659	1136	1757	2347	2763	2960	2974	2975	2975

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