Crop & Pest Report


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Weather Forecast (06/06/19)

The June 6 through June 12, 2019 Weather Summary and Outlook

2019 has been persistently cold.  There have been few periods with above average temperatures since the middle of January.  This past week was finally an exception to that overall rule.  Temperatures were mostly 3 to 6 degrees above average during the period from May 30 through June 4 (Figure 1).  This warmer than average temperature pattern will continue for a couple of more days before cooler air moves back into the region this weekend and into early next week.


With the warmer temperatures came some hit and miss thunderstorms, especially on June 3 and June 4.  Most of the NDAWN (North Dakota Agricultural Weather Network) stations recorded little if any precipitation, although there were some localized exceptions (Figure 2).


The upper-level wind flow, as mentioned in last week’s Crop and Pest Report, has shifted from the persistent southwest flow to a more west to east flow across the lower 48 states.  This west to east flow is generally referred to as a zonal flow.  This should keep the upper-Midwest from recording any widespread heavy rain events that were so common from late April through much of the month of May.  With all thunderstorms, localized 1 inch or greater rainfalls are always possible, but the pattern as we start June is not conducive for widespread areas to record heavy precipitation.  There will be two or three disturbances in the next week that will bring scattered thunderstorms to the area.  The most likely days for rain look to be Friday/Saturday and next Tuesday.  The Friday/Saturday disturbances will also bring with it cooler air with temperatures expected to drop to around or below average starting on Saturday in western North Dakota and Sunday for eastern North Dakota into Minnesota. That trend toward average or below average temperatures looks to be sticking around for a few days once that change occurs this weekend.

My projected growing degree days (GDDs) for the next seven days for Base 50°, 44° and 32° is presented in Figure 3.


Using May 5 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 15 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:


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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