Crop & Pest Report


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Weather Forecast (06/21/18)

The June 21 through June 27, 2018 Weather Summary and Outlook

Every week we are reminded that rain never falls evenly across the area this time of year. One inch or more rain fell across far southeastern North Dakota and from southwestern to northcentral North Dakota into the northern Red River Valley in the past week. All North Dakota Agricultural Weather Network (NDAWN) stations recorded rain in the past seven days, but the range was from very little to over three inches (see Figure 1). The past three weeks have recorded widespread significant rains, but these next seven days look to be noticably drier for much of the region.


Temperatures were cooler than they have been during the week ending on Tuesday, June 19, yet temperatures in eastern North Dakota and northwestern Minnesota still finished above average. Central and western North Dakota into far eastern Montana recorded temperatures right at the average for the middle of June or slightly below (see Figure 2).


The main storm track for the next week, and perhaps even the rest of the month looks to be to the south of North Dakota. Much of South Dakota, Nebraska, southern Minnesota, and Iowa into Illinois should record above average precipitation over the next several days. Plus, with the frequent cloudiness associated with that extra rain and the corresponding wetter soils, temperatures in those areas probably being below normal. But to the north of that main storm track, temperatures should be at least near the average if not above. Western North Dakota and far southern North Dakota will get grazed by some of these storms moving to our west and south and therefore, those areas are expected to record the most precipitation in the next week or more. Other areas look to be recording very little rainfall outside of isolated areas that may get a direct hit from a thunderstorm. Therefore, at the moment it appears the rest of the month will be a drier than average period with the exceptions of those areas mentioned above. Temperatures will be near normal to slightly above in southern North Dakota and in the drier areas in north central and northeastern North Dakota and far northwestern Minnesota will be more likely to record temperatures above average during the next 6 to 10 days. The projected growing degree days (GDDs) base 50°, 44° and 32° for the period of June 21 through June 27, 2018 is presented below in Figure 3.


Using May 5 as a planting date, the accumulated wheat growing degree days (Based 32°) through June 19, 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 June 19, 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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