TACOMA CITY HALL, WASHINGTON

Period of Record General Climate Summary - Growing Degree Days

Station:(458286) TACOMA WB CITY
From Year=1933 To Year=1981
Growing Degree Days for Selected Base Temperature (F)
Base	Jan.	Feb.	Mar.	Apr.	May	Jun.	Jul.	Aug.	Sep.	Oct.	Nov.	Dec.	Annual
40 M	80	118	179	302	494	621	763	768	613	409	192	114	4653
40 S	80	198	377	679	1173	1794	2557	3326	3938	4347	4539	4653	4653
45 M	22	38	67	161	339	471	608	613	463	257	82	36	3158
45 S	22	61	128	289	628	1099	1707	2320	2783	3041	3123	3158	3158
50 M	3	7	14	60	191	322	453	458	313	123	19	4	1968
50 S	3	9	23	83	274	596	1049	1507	1821	1944	1963	1968	1968
55 M	0	0	1	16	79	177	299	303	171	38	2	0	1088
55 S	0	1	2	18	97	274	573	876	1047	1086	1087	1088	1088
60 M	0	0	0	3	24	68	150	153	63	6	0	0	468
60 S	0	0	0	3	27	96	246	399	462	468	468	468	468

Corn Growing Degree Days
50 M	14	33	64	137	252	336	452	457	329	178	51	20	2322
50 S	14	47	111	248	499	835	1288	1744	2074	2251	2302	2322	2322

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