SNOQUALMIE PASS, WASHINGTON

Period of Record General Climate Summary - Growing Degree Days

Station:(457781) SNOQUALMIE PASS
From Year=1931 To Year=1972
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	2	15	61	195	353	564	555	396	175	10	1	2327
40 S	1	3	18	79	274	627	1191	1746	2142	2316	2326	2327	2327
45 M	0	0	2	18	92	212	409	400	254	80	1	0	1469
45 S	0	0	3	21	113	325	734	1135	1388	1468	1469	1469	1469
50 M	0	0	0	4	33	106	260	251	138	26	0	0	819
50 S	0	0	0	4	37	143	404	655	792	819	819	819	819
55 M	0	0	0	1	9	43	137	129	60	5	0	0	384
55 S	0	0	0	1	9	53	190	318	379	384	384	384	384
60 M	0	0	0	0	1	13	56	51	19	1	0	0	140
60 S	0	0	0	0	1	14	70	121	140	140	140	140	140

Corn Growing Degree Days
50 M	0	2	15	49	131	200	321	310	222	93	3	0	1348
50 S	0	2	17	67	198	398	719	1029	1251	1345	1348	1348	1348

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