Year
Year of measurement (surrogate for variety improvements)
Rain0
Pre-season rainfall (in.)
Temp1
Mean temperature for the first growing month (deg. F)
Rain1
Rainfall for the first growing month (in.)
Temp2
Mean temperature for the second growing month (deg. F)
Rain2
Rainfall for the second growing month (in.)
Temp3
Mean temperature for the third growing month (deg. F)
Rain3
Rainfall for the third growing month (in.)
Temp4
Mean temperature for the harvest month (deg. F)
Yield
Yield of wheat in Iowa for the given year (bush./acre)