USGS Scientific Investigations Report 2010–5016 Development of an Environmental Flow Framework for the McKenzie River Basin, Oregon

Table 11. Airport median monthly precipitation totals, Eugene, Oregon, 1936–1962 and 1963–2008.

[p-value less than 0.05 indicate there is a significant difference in the monthly precipitation totals between the pre-dam and post-dam periods. Data from 1936–39 measured at Eugene station (352706) and from 1940–2009 measured at Eugene Airport station (352709)]

Months	Precipitation (inches)		p-value
Months	Pre-dam 1936–1962	Post-dam 1963–2008	p-value
January	5.04	7.53	0.20
February	5.29	4.53	.18
March	4.12	4.78	.29
April	2.33	2.69	.08
May	2.18	2.14	.90
June	1.18	1.03	.89
July	.12	.32	.13
August	.41	.44	.31
September	1.01	1.13	.75
October	2.90	2.95	.62
November	5.81	7.43	.04
December	4.94	7.68	.08