The Iowa Environmental Mesonet (IEM) collects environmental data from cooperating members with observing networks. The data are stored and made available on this website.
Corn Yield Departures
Posted: 22 Mar 2023 05:30 AM, Views: 90
There is an entire industry and academic study built around attempting to correlate agricultural crop yields and environmental data. So today's featured chart contains nothing groundbreaking, but highlights a new autoplot tool on the IEM website that allows you to plot combinations of USDA NASS county yield estimates and IEM tracked long term climate sites weather summary variables over a date period of your choice. There's a lot going on with this plot! The upper left plot shows the raw yield estimates for Boone County with three different trend lines plotted. The lower right plot shows the yearly departures from a trailing ten year averaged trendline with the colors representing the magnitude of the departures. Genetics and management continues to improve over the years, so the trendline allows you to attempt to back out these changes and focus on the year to year variability from weather. These departures are then plotted against eight summary weather metrics over the inclusive 1 June through 31 August period for Ames with the top three and bottom three departure years highlighted by special icons. There are some intuitive relationships readily seen with the lack of precipitation and excess of precipitation clearly leading to negative yield departures. If this interests you, try out the "Generate this Chart on Website" link and see what relationships you can find :)
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Previous Years' Features
2019: High Temp Variability
2018: Chance of 4+ Inches
2017: Wet Bulb Effect
2016: Rapid Rise
2013: March Struggle
2012: Four sigma weather!
2011: Hail time
2010: Quick melt
2005: Variability is normal
2004: Spring has sprung
2002: A Cold Start
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Soil Temperatures

Data from the Iowa State Soil Moisture Network is found on this website and daily soil temperature averages are used to produce the highlighted analysis.