SEATTLE JACKSON PARK, WASHINGTON

Period of Record General Climate Summary - Growing Degree Days

Station:(457459) SEATTLE JACKSON PARK
From Year=1961 To Year=1986
Growing Degree Days for Selected Base Temperature (F)
Base	Jan.	Feb.	Mar.	Apr.	May	Jun.	Jul.	Aug.	Sep.	Oct.	Nov.	Dec.	Annual
40 M	73	111	169	264	463	600	744	755	590	374	160	79	4382
40 S	73	183	352	616	1079	1680	2424	3179	3768	4142	4302	4382	4382
45 M	18	36	60	125	308	450	589	600	440	224	62	20	2932
45 S	18	54	113	239	547	998	1587	2186	2626	2850	2912	2932	2932
50 M	2	6	11	41	163	301	434	445	291	98	13	2	1807
50 S	2	8	20	61	224	524	959	1403	1694	1792	1805	1807	1807
55 M	0	1	1	10	65	159	280	290	152	28	1	0	986
55 S	0	1	1	11	77	235	515	805	956	984	985	986	986
60 M	0	0	0	2	21	58	136	143	53	4	0	0	417
60 S	0	0	0	2	23	81	217	360	413	417	417	417	417

Corn Growing Degree Days
50 M	15	36	72	131	246	332	444	451	327	177	47	12	2289
50 S	15	51	123	254	500	832	1276	1727	2053	2230	2277	2289	2289

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 Jul 28, 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