SNOQUALMIE PASS, WASHINGTON

Period of Record General Climate Summary - Growing Degree Days

Station:(457781) SNOQUALMIE PASS
From Year=1910 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	13	57	179	344	556	550	377	164	11	1	2254
40 S	1	2	15	72	251	595	1151	1701	2078	2242	2253	2254	2254
45 M	0	0	2	17	81	205	401	395	236	71	1	0	1410
45 S	0	0	2	19	100	305	706	1102	1338	1409	1410	1410	1410
50 M	0	0	0	3	28	100	251	245	124	22	0	0	775
50 S	0	0	0	3	31	131	383	628	752	775	775	775	775
55 M	0	0	0	1	7	39	127	121	52	5	0	0	351
55 S	0	0	0	1	7	47	174	294	346	351	351	351	351
60 M	0	0	0	0	1	12	49	43	15	0	0	0	120
60 S	0	0	0	0	1	13	61	105	120	120	120	120	120

Corn Growing Degree Days
50 M	0	1	14	47	122	198	320	313	214	91	5	0	1326
50 S	0	2	15	63	185	383	703	1016	1230	1321	1326	1326	1326

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