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Weather Forecast (5/31/18)

The May 31 through June 6, 2018 Weather Summary/Outlook

These past seven days were quite warm with temperatuers 10° to 20° above average across much of the region. In fact, these past seven days may end up as the warmest period of the summer, or close too it. Granted, such a week in July would be closer to 10° above normal, yet in terms of actual temperatures it would not surprise me that although it occurred in late May, this past week ends up being the warmest stretch of 2018, or again, close to it.


With the warmth did come some rain with eastern Montana into western North Dakota recording the most. Northwestern North Dakota in particular recorded widespread 1” plus rainfall. Although there are nearly 100 North Dakota Agricultural Weather Network (NDAWN) stations, those stations do not always catch the heavier pockets of rain. Because thunderstorms drop widely varying totals there were several other localized areas where over an inch of rain fell in the past week scattered across the region that are not shown in the graphic (Figure 2).


June is expected to start off much cooler than May ended. Yes, there will be the occasional day, but many of the next 7 to 10 days look to be recording temperatures much closer to seasonal averages. These temperatures may seem cool based on the higher temperatures many parts of the area have recorded lately, but for early June they should be near or even slightly above the average for this time of year. Although every day in the past week some part of North Dakota or northwestern Minnesota recorded some rain, it was mostly hit and miss with more missing than hitting on many of the days. Besides some lingering rains this morning (Thursday), the next opportunity for precipitation looks to be Friday into Saturday. Then again next Tuesday into Wednesday. Both events will have a brief surge of warm air ahead of the rain/thunderstorms with noticeable cooling once the cold front that will trigger the rains moves through. Because of the much cooler conditions expected, the growing degree days (GDDs) base 50°, 44° and 32° will be approximately 25% lower than last week (see Figure 3).


Using May 5 as a planting date, the accumulated wheat frowing degree days (Based 32°) is presented in Figure 4 through May 29, 2018. You can find your exact GDDs for your planting date(s) at:


Using May 10 as a planting date, the corn accumulated growing degree days is presented in Figure 5 through May 29, 2018. You can find your exact GDDs for your planting date(s) at:



Daryl Ritchison


Interim 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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