IEM Daily Feature
Wednesday, 30 July 2014

GDD Scenarios

Posted: 30 Jul 2014 05:45 AM

What should be the warmest portion of the year has been chilly with temperatures running below average. The cool weather has put Growing Degree Day accumulations behind schedule which leads to worries that crops will not reach maturity prior to the first fall freeze. The featured chart attempts to provide the chances that a certain GDD threshold will be met by a certain date this fall given an initial planting date. For example, for a crop planted on May 1 and needing 2600 GDD units has reached that level by 15 September 50% of the time in the past. For this year, the same combination comes in around 15% given that our upcoming weather somewhat mimics historical data. You can generate more charts like this on the website under "Ag Weather" and then GDD "Probabilities and Scenarios" or directly here.

Voting:
Good = 16
Bad = 8
Abstain = 9