Western Research and Demonstration Farm
The 2010 growing season resulted in mean monthly temperatures that varied from -9 o F to +6 o F of the 30-yr average (Table 1). This year there were a total of 14 days above 90 o F, up from four in 2009 and up from two in 2008. Overall, 2010 was a cooler year than typically experienced through the winter months and nearly typical for the summer months.
Iowa State University
Licht, Mark A.; DeJong, Joel L.; and Roush, Wayne B., "Weather and Growing Season Summary" (2011). Iowa State Research Farm Progress Reports. 289.