Crop & Pest Report


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Weather Forecast (08/31/17)

The August 31 through September 6, 2017 Weather Summary/Outlook

The past few days have been an exception, but much of the month of August has been on the cool side. Most of the North Dakota Agricultural Weather Network (NDAWN) stations have recorded temperatures 3° to 6° below normal this month. Our current stretch of above average temperatures is expected to last through Sunday, then much cooler temperatures are projected for several days next week.


August has been cool, but also the wettest month of the growing season in many parts of the state. August average rainfall is around 1.5 inches along the North Dakota / Montana border and near 2.5 inches in the Red River Valley. The central and northern Red River Valley, into northwestern Minnesota and parts of northwestern and southwestern North Dakota, were the main locations to record below average rainfall this month.


The above average temperatures currently in place will be replaced by cooler air next week. Next Tuesday through Friday look to be well below average for temperatures. Below average temperatures this time of year can bring the threat for frost. As of this writing, temperatures dropping into the 30s in some parts of the region next week clearly look like a possibility, but as is always the case this time of year - the sky needs to be clear and the wind light. We have experienced lows in the 30s already on August 23 and 24 at some NDAWN stations and 30s this time of year are very unwelcome, yet not uncommon. Rain possibilities in the near term will come on Friday and again on Monday. The Labor Day rain chance will be associated with a cold front that will bring in that expected colder air that will linger much of next week.

The projected growing degree days (GDDs), base 50°, 44° and 32  for the period August 31 through September 6 is presented below.


The projected number of hours with relative humidity (RH) above 85% for the period of August 31 through September 6 is presented below. The dry conditions in the past week, plus with only scattered precipitation anticipated, the number of high RH hours this week should be near the average for this time of year.

Using May 10, 2017 as an average planting date, the number of corn growing degree days (Base 50°) accumulated through August 29 is depicted below. The exact numbers based on your actual planting date(s) can be found here:


Using a planting date of May 1, 2017, the number of wheat growing degree days (Base 32°) accumulated through August 29 is presented below. The exact numbers based on your actual planting date(s) can be found here:



Daryl Ritchison


Interim Director of the North Dakota Agricultural Weather Network

This site is supported in part by the Crop Protection and Pest Management Program [grant no. 2017-70006-27144/accession 1013592] from the USDA National Institute of Food and Agriculture. Any opinions, findings, conclusions, or recommendations expressed are those of the website author(s) and do not necessarily reflect the view of the U.S. Department of Agriculture.

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