Western Research and Demonstration Farm
Precipitation for 2011 was less than the longterm climate average. Early in the year, precipitation lagged behind normal, but then tracked close to the normal accumulation rate from mid-April through mid-August. After that time, precipitation amounts greatly lagged behind normal, and the year ended almost 7 in. behind the long-term average. (Figure 1). Overall, 2011 will be remembered for good moisture early, but ending the season with almost no rainfall.
Iowa State University
DeJong, Joel L. and Roush, Wayne B., "Weather and Growing Season Summary" (2012). Iowa State Research Farm Progress Reports. 128.