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Transforming Climate Variability and
Change Information for Cereal Crop Producers

U2U Decision Support Tools - Corn GDD

Welcome to the Corn Growing Degree Day (GDD) decision support tool.

This tool puts current conditions into a 30-year historical perspective and offers trend projections through the end of the calendar year. GDD projections, combined with analysis of historical analog data, can help you make decisions about:
  • Climate Risks– Identify the likelihood of early and late frosts/freezes.
  • Activity Planning – Consider corn hybrid estimated physiological maturity requirements, along with GDD projections when making seed purchasing and other growing season decisions.
  • Marketing – Look at historical and projected GDD when considering forward pricing and crop insurance purchases.

While this tool is not meant to be a crystal ball, data and information derived from the tool can be used to make helpful inferences about current conditions, especially when combined with personal experience and localized knowledge. Please note that data is currently limited to states within the U2U project area plus Kentucky & Tennessee.

To get started, click on any location within the gray area of the map.
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Tool Tips:
  • Use white user location icon () in upper right hand corner of map to zoom to current location of computer being used.
  • Use the layer icon () in the upper right hand corner of the map to control your viewing options.
  • Tested with browsers: Internet Explorer 11 & later; FireFox 27.0 & later; Chrome 33.0 & later; Safari 6.1.6 & later.
This tab allows you to put corn (86/50) GDD progress into a 30-year historical perspective. Customize your data:
  • Choose your GDD start date, freeze temperature threshold and corn maturity rating
  • Add up to 3 years from 1981 to previous year for comparison
  • Adjust the variation of historical GDD and temperature data visible on the graph
  • Add or remove silking, black layer and freeze dates for a comprehensive growing cycle snapshot
GDD Start:
Comparison Years:
Corn Maturity Days:
Silking GDDs:
Freeze Temperature (°F):
Variation:
Current Day:
Black Layer GDDs:
Tool Tips:
  • Select the blue question mark icon in the top right corner of the tab section for instructions and other information.
  • Print this chart or export it in a variety of formats using the Chart Options feature.
  • Add or remove visual elements by clicking on their corresponding legend icons.
  • Zoom in by clicking above or below the plotted data and dragging your cursor diagonally in either direction to select the magnified region. Use "Reset zoom" button in upper right of graph to zoom out.
This tab provides a text-only view of current and historical Corn (86/50) GDD accumulations, silking and black layer dates, and first/last freeze dates.
GDD Start:
Corn Maturity Days:
Silking GDDs:
Freeze Temperature (°F):
Variation:
Current Day:
Black Layer GDDs:

User Input Summary

Location (lat, long): Tippecanoe Co., IN

Location (county, state): Tippecanoe Co., IN

GDD Start Date: Tippecanoe Co., IN

Today's Date: Tippecanoe Co., IN

Latest Data Available: September 30, 2014

Corn Maturity Days: Tippecanoe Co., IN

Growing Degree Days to Silking: Tippecanoe Co., IN

Growing Degree Days to Black Layer: Tippecanoe Co., IN

Corn Growing Degree Day (GDD) Results __________30-Year History (1981 - 2010)_________________

This Year (2014)AverageOccurs within 100% of the time

GDD Accumulation (September 30 - September 30)99710501020

V2 DateSeptember 30 - September 30 - September 30--

V4 DateSeptember 30 - September 30 - September 30--

V6 DateSeptember 30 - September 30 - September 30--

V8 DateSeptember 30 - September 30 - September 30--

V10 DateSeptember 30 - September 30 - September 30--

Silking Date (Estimated (Earliest - Latest))September 30 - September 30 - September 30September 30September 30

Black Layer Date (Estimated (Earliest - Latest))September 30 (Estimated)September 30September 30

Freeze Results

Last Spring FreezeSeptember 30September 30

Freeze Probability after May 1September 30

First Fall FreezeSeptember 30September 30

Freeze Probability before Black LayerSeptember 30

** = Not available since, GDD start date is after today’s date; use information under 30-year history
Accumulated GDD Details
DateAccumulated GDDsGDDs per DayVegetation StageForecast Range1981-2010 Range1981-2010 Average
Tool Tips:
  • Select the blue question mark icon in the top right corner of the tab section for instructions and other information.

U2U Corn Growing Degree Day Animations

The following time-lapse animations are visual representations of annual GDD accumulations.
Click the play button to start chosen animation.
Note that a plugin that displays quicktime movies is required for these animation files.

The following is an animation for 2013.

The following is an animation for 2012.

The following is an animation for 2002.

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