Crop & Pest Report


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Weather Forecast (05/27/21)

The May 20 to May 26, 2021 Weather Summary and Outlook

This past week was by far the rainest week of the season.  There were several areas that recorded between 3 to 5 inches of rain in the last 7 days (Figure 1).  The rain did not fall evenly, it never does, but many locations got a very beneficial rain with a few spots recording too much of a good thing.  The southern one-third of North Dakota was expected to get rain overnight into this morning (Thursday) but beginning now through next week, it appears our dry pattern is coming back.


Northern North Dakota recorded several cloudy cool days in the past week, keeping temperature at or even well below average in the past week (Figure 2).  This period is also starting colder than average meaning few growing degree days for the next few days, but next week looks much warmer.


There was either a frost (36°) or a freeze (32°) yesterday (Wednesday) and it was expected in some locations again today (Thursday).  It appears there will another threat of a frost or freeze on Friday morning as well.  If the sky clears, the freezing temperatures may be much more widespread then the past couple of mornings.  After we get past Friday, a slow warm up will begin and hopefully no more freezing temperature potential for the rest of this forecasting period.  As hinted to already, it appears we will be heading back into a dry pattern.  There should be some hit and miss showers or thunderstorms on Saturday as a weak cool front moves across the northern plains.  I’m sure there will be a day or two with at least some spotty moisture, but another widespread event seems unlikely for the next 7 days.

The projected growing degree days (GDDs) base 50°, 44° and 32° for the period of May 27 through June 2, 2021 can be found in Figure 3.  Most of the growing degree days this period will come next week.


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 10 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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