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Weather Forecast (08/26/21)


If you live in eastern North Dakota or in Minnesota, the past week was either near or several degrees above average for temperatures. If you live in western North Dakota or in Montana this past week was quite chilly with temperatures between 5° to 10° below average (Figure 1).

weather 1.082621

It was this boundary between those two air masses that was partially responsible for the widespread and in many instances heavy rain that fell across the region in the past week (Figure 2). This pattern change, over what the region has been experiencing during most of the 2021 growing season, will continue for the next couple of weeks with several disturbances expected. With that rain in the forecast and the accompanied cloud cover, it is likely the region will experience more below average temperature days than above average temperature days.

weather 2.082621


The projected growing degree days (GDDs) base 32°, 44° and 50° for the period of August 26 through September 1, 2021 can be found in Figure 3. 

weather 3.082621

Using May 10 as a planting date, the accumulated growing degree days for corn (base temperature 50°) is given in Figure 4. You can calculate corn growing degree days based on your exact planting date(s) here:

weather 4.082621

Soybeans also use base 50° like corn, but NDAWN has a special tool for soybeans that, based on your planting date and cultivar, can estimate maturity dates based on average temperatures, as well as give you GDDs based on your planting date(s) you set. That tool can be found here:


Daryl Ritchison


Director of the North Dakota Agricultural Weather Network (NDAWN)