Crop & Pest Report


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Weather Forecast (08/02/18)

The August 2 through August 8, 2018 Weather Summary and Outlook

Temperatures were well below average at most of the North Dakota Agricultural Weather Network (NDAWN) stations during the period of July 25 through July 31, 2018 (Figure 1). With the second half of July mostly on the cool side, the month as a whole finished near or slightly below normal for temperatures. That was a noticable departure from what was recorded during both May and June as both of those months finished with above average temperatures.


There were some widely scattered thunderstorms in the region this past week on a few days with most of the NDAWN station not recording much precipitation (Figure 2). In fact, several NDAWN recorded little or no precipitation from July 25 through July 31, 2018. South central and southeastern North Dakota into west central Minnesota recorded above average rainfall in July, but most of the rest of the area recorded below average rainfall during July.


The past couple of weeks the temperatures have mostly been below average. The next couple of weeks will see temperatures recover back to average or even above average. There will be several cold fronts moving through with a day or two of cooler air, similar to what we experienced yesterday and what eastern North Dakota and western Minnesota are experiencing today (Thursday). Yet, overall a warmer period is expected for the first 10 days of August. The transitional periods from warmer to cooler will of course be our main thunderstorm opportunities.
This weekend and toward the middle of next week looks to be the best time periods for rainfall. This time of year, widespread rain events are less likely, meaning most of the rain we get in the near term will come from scattered or isolated thunderstorms. Therefore, typical of August, a trend toward drier conditions in many areas will be the trend for the first part of this month. The projected growing degree days (GDDs) Base 50°, 44° and 32° for the period of August 2 through August 8 is presented in Figure 3.


Using May 5 as a planting date, the accumulated wheat growing degree days (Based 32°) through July 31, 2018 is presented in Figure 4. You can find your exact GDDs for your planting date(s) at:


Using May 10 as a planting date, the corn accumulated growing degree days (Base 50°) through July 31, 2018 is presented in Figure 5. You can find your exact GDDs for your planting date(s) at:



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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