Growing Degree Days, Battleground WA

This information is from Western Regional Climate Center.

Trinity SE Sweetcorn need 1,190 heat units  Based on the info below, if I understand correctly, adding to May (now) 559 growing degree days, +1,190 = 1759 which occurs in August.  But I don't know that I understand this table correctly.

Pawpaws require 150 frost free days and 2200 growing degree days, which I am thinking we get here in Sept or Oct. Might be OK.

Station:(450482) BATTLE GROUND
From Year=1928 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	62	96	168	275	456	584	747	756	607	375	153	69	4348
40 S	62	159	326	602	1057	1641	2388	3144	3751	4126	4279	4348	4348
45 M	16	27	63	142	302	434	592	601	457	226	59	18	2938
45 S	16	43	106	249	551	985	1577	2178	2635	2861	2920	2938	2938
50 M	2	4	16	57	165	285	437	446	308	105	13	2	1840
50 S	2	6	22	78	243	528	965	1411	1719	1824	1837	1840	1840
55 M	0	0	2	17	72	150	284	292	171	33	1	0	1023
55 S	0	0	2	19	91	241	525	817	988	1021	1023	1023	1023
60 M	0	0	0	3	26	62	148	152	71	6	0	0	468
60 S	0	0	0	3	29	91	239	391	462	468	468	468	468
Corn Growing Degree Days
50 M	16	44	88	153	258	334	456	465	373	215	61	16	2479
50 S	16	60	148	300	559	892	1349	1814	2187	2402	2463	2479	2479

I bolded the bottom line.   That seems the most relevant.

Interpretation of the table:

"M = Monthly Data
S - Running sum of monthly data. 

Growing Degree Day units =  (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. "