Western Research and Demonstration Farm
The 2009 growing season resulted in mean monthly temperatures that varied from -8o F to +7o F from the 30-year average (Table 1). This year there were a total of four days above 90o F, down from 10 days in 2007 and up from 2 in 2008. Overall, 2009 was a cooler year than normal. In western Iowa, this growing season will be remembered for the combination of cooler and wetter weather conditions during the growing season.
Iowa State University
Licht, Mark A., "Weather and Growing Season Summary" (2010). Iowa State Research Farm Progress Reports. 448.