Growing Degree Days (GDD)- are an attempt to quantify heat available for vine development during the growing season.
By convention grape degree days are tallied between Apr 1 & Oct 31, and a base temperature of 50°F is used.
Sum of (
(Daily Max Temp - Min Temp)2
) - 50)
Apr 1 - Oct 31
Raw Data is provided The Pacific Northwest Cooperative Agricultural Weather Network (AgriMet).
Accuracy of the data has not been verified by winebusiness.com. Winebusiness.com makes no warranties, expressed or implied,
concerning the accuracy and complete-ness of this data.
daily average ETo
N. Willamette Vly - Aurora (elev: 140 ft) 14 day ETo (daily avg.)
tip: mouse over line to read data for a specific date
Evapotranspiration (ET) is the loss of water to the atmosphere by the combined processes of evaporation (from soil and plant surfaces) and transpiration (from plant tissues).
It is an indicator of how much water your crops need for healthy growth and productivity. ET from a standardized grass surface is commonly denoted as ETo.