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Weather Forecast (06/24/21)


This past week had one main period of rain across the region that occurred on Saturday night into Sunday. The highest rain totals were between Highway 2 and Interstate 94 where some localized areas near one inch were recorded (Figure 1). Most other locations recorded at least some rain with the main exception in the southwest corner of North Dakota.

Map showing total rain at selected NDAWN for the 168 hours ending at 10:00 a.m. June 23, 2021

The rain was associated with an area of low pressure and a cold front. Temperatures were well below average for two or three days depending on your location. It was cold enough for frost to be reported in portions of western and southern North Dakota on June 21. Overall, this past week the temperatures were mostly in the 2° to 5° below average range (Figure 2).

Figure 2. Map: Departure from average temperature at selected NDAWN weather stations from June 17 through June 22, 2021

Yesterday (Wednesday) was likely the hottest day the region will experience in the short term. During this next week a ridge of high pressure aloft will build over the Pacific Northwest. This will mean North Dakota and northwestern Minnesota will continue to have the upper-level wind blow in from the northwest or even the north at times. This is expected to keep temperatures near seasonal averages for the next several days. The big question is will that “bubble” of heat push into the Northern Plains next week? If it does, it would probably be later next week into perhaps the Independence Day weekend period. There should be some rain Friday in especially southwestern North Dakota and some hit and miss activity over the weekend. Yet, the overall pattern does not look to be conducive anytime soon to a more widespread event like was recorded last weekend.

The projected growing degree days (GDDs) base 50°, 44° and 32° for the period of June 24 through June 30, 2021 can be found in Figure 3.

Figure 3. Map: Projected growing degree days, Base 32-, 44- and 50-degrees for the period of June 24 to June 30, 2021.

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:

Figure 4. Map: Accumulated Growing Degree Days for Wheat (Base 32 degrees) since May 1, 2021

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:

Figure 5. Map: Accumulated Growing Degree Days for Corn (Base 50 degrees) since May 10, 2021

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 (NDAWN)