Crop & Pest Report


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Weather Forecast: (07/13/17)

The July 13 through July 19, 2017 Weather Summary/Outlook

There were several rain events in the past week, but they generally produced light and spotty precipitation totals with one notable exception and that was some localized one to two inch or more rains that fell on Tuesday, July 11, 2017.  Much of the rain that day came from a couple of strong thunderstorms, one in northeastern North Dakota and the other from a very strong thunderstorm that produced a large tornado that moved from north of Mayville, ND into west central Minnesota.  The higher rain totals were in eastern North Dakota and northwestern Minnesota with western North Dakota once again recording little or no rain.  It appears that these next 7 days will once again produce little rainfall in the parched western portion of the state and even eastern areas look to be dry as well.


Western North Dakota not only was dry, but also quite warm with temperatures 7° to 10° above normal.  Several North Dakota Agricultural Weather Network (NDAWN) stations recorded a maximum of 100° or greater on one or more days during the past week in that part of the state.   An additional day or two near or above 100° looks to be occurring during the next seven days as well, in those same locations that recorded triple digit heat last week.  


North Dakota will be on the boundary of some very warm temperatures through the middle of next week.  This boundary will shift slightly north and south bringing with it some noticeable changes in daily temperatures with one day hot and the next day not so hot.  This boundary will also mean temperatures in northern North Dakota and far northwestern Minnesota will be significantly cooler than southern areas on some days.  Overall, there will be more above normal days than below normal days meaning another period with above average temperatures, yet, even with that boundary occasionally shifting back and forth through the region, very little rain is expected.

The projected growing degree days (GDDs), base 32°, 44° and 50  for the period July 13 through July 19 is presented below.   Most of North Dakota and northwestern Minnesota will record about the same number of GDDs as last week.


With an expectation of mostly dry and warm conditions through the middle of next week, another period of  lower than normal relative humidity hours above 85% is expected during this forecast period.  The projected hours for the period July 13 through July 19, 2017 is presented in the graphic below.


Using May 10, 2017 as an average planting date, the number of corn growing degree days (Base 50°) accumulated through July 11 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 July 11 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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