By the middle of the century, the Northern Great Plains region is expected to experience between 5 and 45 more days per year with a maximum temperature exceeding 90 degrees Fahrenheit.

For an average of seven days per year, maximum temperatures reach about 95 degrees F in the Northern Plains. By mid-century, much of the region is expected to experience 20-40 more hot days (above 90 degrees F) each year. The southern parts of this region, particularly Nebraska and South Dakota, will experience the largest increase in number of days above 90 degrees F, while mountainous portions of Wyoming and Montana will experience the least. Similar increases are expected in the number of nights with minimum temperatures higher than 75 degrees F in the south (Nebraska), 60 degrees F in the north, and 40 degrees in the mountainous areas of Wyoming and Montana.