Projected Increases in the Number of Days over 90 Degrees

The data used to create this figure comes from Figure 16.2 in the Third National Climate Assessment report. It shows the average of projections of the number of days over 90 degrees Fahrenheit in the northeast from several climate models. On the global scale, climate model simulations show consistent projections of future temperature conditions under a range of emissions scenarios. All models show warming by late this century that is much larger than historical variations nearly everywhere globally. For the U.S., models unequivocally project large and historically unprecedented future warming in every region of the U.S. under all of the scenarios used in this assessment. The amount of warming varies substantially between higher versus lower scenarios, and moder- ately from model to model, but the amount of projected warming is much larger than historical variations. Likewise, the models project unequivocal increases in the number of days over 90 degrees Fahrenheit that are larger than historical variations.

Citation: Melillo, Jerry M., Terese (T.C.) Richmond, and Gary W. Yohe, Eds., 2014: Climate Change Impacts in the United States: The Third National Climate Assessment. U.S. Global Change Research Program, 841 pp. doi:10.7930/J0Z31WJ2