Crop & Pest Report


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Weather Forecast (08/01/19)

The August 1 through August 7, 2019 Weather Summary and Outlook

The combination of more cloud cover than expected and the anticipated cooler weather from earlier this week being even cooler than projected made the past week colder than forecasted (Figure 1).  The warmer temperatures that moved into parts of the region yesterday will continue today through the weekend in all areas followed by a slight cooling early next week.


Most of the rain that fell in the past seven days occurred this past Saturday night into Sunday (Figure 2).  Many areas recorded little if any precipitation in the past week.  This means there are now locations, especially in northern North Dakota that have recorded little to no moisture in the past three weeks.  Like last week, there will be pockets of beneficial rain where the thunderstorms hit directly, but the odds favor most of North Dakota and northwestern Minnesota to record below average rainfall in the next seven days.


Much warmer air is anticipated today through the weekend.  Temperatures should be at or above average during this period with a slight cool down early next week.  With the increase in temperature, there will also come an increase in the dew point temperatures.  This will create conditions for higher relative humidity levels, especially in the overnight hours.  A cool front is expected to move through on Sunday that should not only lower the temperatures a bit for early next week, but also bring in drier air, meaning, lower dew points and more comfortable air for both cattle and humans.

My projected growing degree days (GDDs) for the next seven days for Base 50°, 44° and 32° is presented in Figure 3.   With warmer temperatures anticipated, most locations are expected to have more GDDs this week than what was recorded during the last seven days.


With higher dew points already discussed and the increase risk of high relative humidity (RH) during the overnight hours, most locations will probably record more high RH hours this week than last.  My projected hours with high RH through August 7 are presented in Figure 4.


Using May 5 as a planting date, accumulated growing degree days for wheat (base temperature 32°) is given in Figure 5.   You can calculate wheat growing degree days based on your exact planting date(s) here:


Using May 15 as a planting date, accumulated growing degree days for corn (base temperature 50°) is given in Figure 6.   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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