Crop & Pest Report


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Weather Forecast (06/11/20)

June 11 to June 17, 2020 Weather Summary and Outlook

Many parts of the region were looking for rain and although all North Dakota Agricultural Weather Stations recorded at least some precipitation, amounts varied greatly (Figure 1). The northern Red River Valley was situated near a stalled warm front where thunderstorms developed over and over the same area (training) and in turn 3 to 6 inches of rain was recorded. Before the rain, that area was mostly quite dry, but that changed quickly to overly saturated with overland and river flooding. These next 7 days it does not appear a strong low pressure system will move through, meaning, the rain that does fall through the middle of next week looks more hit and miss and outside of a localized area, significant rainfall seems unlikely, at least through early next week.


As was the case with rainfall, temperature anomalies varied significantly across the region. Far western North Dakota and eastern Montana recorded temperatures near to slightly below average, whereas, parts of eastern North Dakota and western Minnesota recorded temperatures 5 to 7 degrees above average for early June (Figure 2). These next 7 days will start off cool, in fact, some locations may record lows in the 30s the next couple of mornings, but much warmer temperatures will return this weekend into early next week.


The projected growing degree days (GDDs) base 32°, 44° and 50° for the period of June 11 through June 17, 2020 can be found in Figure 3. A high percentage of these growing degree days will occur Sunday through next Wednesday.


Using May 1 as a planting date, accumulated growing degree days for wheat (base temperature 32°) is given in Figure 4.  You can calculate wheat growing degree days based on your exact planting date(s) here:


Using May 20 as a planting date, accumulated growing degree days for corn (base temperature 50°) is given in Figure 5.  You can calculate corn growing degree days based on your exact planting date(s) here:


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

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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