Enviro-weather tip: GDD accumulations

Editor’s note: This article is from the archives of the MSU Crop Advisory Team Alerts. Check the label of any pesticide referenced to ensure your use is included.

Use weather summaries at www.enviroweather.msu.edu that include growing degree-days (GDD) to get GDD accumulations for the entire year-to-date. The summary automatically generates a report showing data from April 1 first through the current date. Even though the report begins April 1, the GDDs are calculated from January 1. To get a report that includes all dates or any number of consecutive days between January 1 and the current date, use the “Change date range” option near the top of the page. Remember, all GDDs on these reports are calculated from January 1.

To get a report that calculates GDD accumulations after a certain date, click on “More data from MAWN for this station.” Near the bottom of the MAWN page is a drop down menu for “Select Data Type”, click on the arrow and select “Growing degree-day data”. Options for methods and dates will appear on the screen. Enviro-weather generally uses the Baskerville-Emin (BE) method for calculating GDD. You can select one or all four methods for your report. Then select the starting date and ending date of your interest. When you click on “generate report,” you will get a report that begins accumulating GDDs at your start date and continues accumulation through your end date.

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