Willamette Valley Weather - What's Normal?

Josh Nelson
CPS Tangent

Current indications suggest an early harvest schedule for most of our Willamette Valley Crops this season.  As we all watch the weather and try to guess what will happen in the next four months, here are some interesting stats for what has transpired so far and what is generally considered normal.   CPS has several weather stations throughout the valley that vary a lot by location, so what follows here is data collected north of Corvallis at the OSU Hyslop weather station.

Corvallis averages 166 days of measurable rain or snow per year, and 42.7 inches of moisture per year
Salem averages 164 days of measurable rain or snow per year, and 39.7 inches of moisture per year
Eugene averages 144 days of measurable rain or snow per year, and 46.1 inches of moisture per year

Growing degree days in Corvallis from January 1 as of Monday May 13 was at 1067.  For the same time last year we were at 993

Mean Rainfall for Corvallis for the first five months looks like this:

Month                       Mean Average             2013
January                           6.82                           1.71
February                         5.04                           1.99
March                             4.55                           2.58
April                                2.56                          1.95
May                                1.95                           .82     (As of 5/23)

Rainfall since January 1   9.09 inches 
Normal for same period  21.46 inches

Rainfall for crop year September 1  31.73 inches       
Normal for same period 41.47