Crop & Pest Report


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Weather Forecast (06/18/20)

The June 18 to June 24, 2020 Weather Summary and Outlook

Many parts of the North Dakota Agricultural Weather Network (NDAWN) experienced little or no rain from June 10 through June 16, 2020 (Figure 1).  There were scattered thunderstorm in western North Dakota that hit some of the NDAWN stations in northwestern North Dakota and northeastern Montana Sunday night into Monday morning.  During that same period there were some storms in southwestern North Dakota, but the storms generally missed the NDAWN stations, but there was some localized one inch totals as well as large hail in western Adams and Hettinger Counties.


Although some NDAWN stations recorded rain yesterday (Wednesday and not included in Figure 1), a vast majority of the region has recorded around or less than 70% of normal rainfall since May 1, with many parts of western North Dakota recording less than 50% of normal in the past six weeks.  This next week continues to not look promising for rain in western North Dakota.  It only takes one thunderstorm for a particular area, but overall, most locations look to be continuing to record below average precipitation for the next week to ten days, especially in western North Dakota.


The end of last week was cool, but that changed with temperatures well above average for the past several days, especially in southeastern North Dakota where some locations recorded three straight 90° or warmer days. Temperatures from June 10 through June 16 were mostly above average overall with a few exceptions (Figure 3).  Today (Thursday) will be the start of a cooler period with highs mostly in the 70s for the next few days with some locations even staying in the 60s on at least one of the days.  In turn, there will be fewer Growing Degree Days (GDDs) this week than what was experienced these past seven days.


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 4.


Using May 1 as a planting date, accumulated growing degree days for wheat (base temperature 32°) are 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°) are 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:


You may notice that my graphics this week include stations that were on the NDAWN current page, but not available for historical, Growing Degree Days or crop disease analysis.  These additional features will be released to the public soon and may be available on our main website, as you’re reading this, or in the next few days.  We appreciate everyone’s patience as the NDAWN programmer slowly catches up from rapid growth of the Mesonet during the past couple of years.  More stations will be coming online through the summer.


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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