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    Online Corn Growing Degree Day Calculator          
                                 
Calculate the Cumulative Growing Degree Days starting from your planting date to any ending date within the growing season      
Range starting from 4/1/2003 --------------> 9/26/2003       Corn growth and development stages when yield components are determined      
Range starting from 4/1/2004 --------------> 9/26/2004       Stage GDU Potential Actual H2O (in.)      
Range starting from 4/1/2005 --------------> 9/26/2005       Wireworms          
                  125 Ears/area ----- 0.9      
      Growing Year         200 Black Cutworm          
                    Corn Rootworm       GDD = Ta - Tbase, if Ta is greater than Tbase  
Planting Date     End Date         400 CornBorer       GDD = 0, if Ta is less than or equal to Tbase  
Month Day     Month Day       470 Kernel rows/ear "Factory" 3   Where: Tbase = temperature base, usually 50F  
          500 Black Cutworm       Ta = average temperature  
                  600 CornBorer          
Cumulative GDD from planting date to end date         Corn Rootworm          
Cumulative rainfall from planting date to end date inches     700 CornBorer       Ta = (Tmax + Tmin) / 2  
Planting Date 4" Bare Soil Temperature @ 10:00 A.M. degrees F     700 Black Cutworm          
Planting Date + 1 day 4" Bare Soil Temperature @ 10:00 A.M. degrees F       Corn Rootworm          
Planting Date + 2 days 4" Bare Soil Temperature @ 10:00 A.M. degrees F       Corn Rootworm          
Planting Date + 3 days 4" Bare Soil Temperature @ 10:00 A.M. degrees F     815 ----- Kernel rows/ear 6.8      
Planting Date + 4 days 4" Bare Soil Temperature @ 10:00 A.M. degrees F     900 Black Cutworm          
Planting Date + 5 days 4" Bare Soil Temperature @ 10:00 A.M. degrees F       Corn Rootworm          
                  1000 Black Cutworm       Disclaimer Notice: Lange Weather Station and/or other affiliates will not be responsible for any management decision(s) solely implemented from calculated results. This tool is provided as an additional resource in your decision making processes. Thank you for cooperating and visiting.  
                  1160 Kernels/row ----- 10    
                    Corn Rootworm        
                  1250 Kernel weight Kernel number Ears/area 13.5    
                  1400 CornBorer        
                  1700 CornBorer        
                  1900 CornBorer          
                  2350 ----- Kernel weight 21.9      

Automatic recalculation