Where have Spring and Fall Gone? Changes in Temperate Transition Season Days

Authors: Claire Iott*, Southern Illinois University Edwardsville, Alan Black, Southern Illinois University Edwardsville
Topics: Climatology and Meteorology
Keywords: thermal comfort, transition seasons, apparent temperature
Session Type: Virtual Poster
Day: 4/9/2021
Start / End Time: 11:10 AM / 12:25 PM
Room: Virtual 51
Presentation File: No File Uploaded

Anecdotal evidence suggests that temperate transition season days are less numerous in recent years, with abrupt shifts directly from winter to summer or summer to winter becoming more common. In this work we examine this change for St. Louis using two temperature-derived metrics. Evidence suggests that temperate transition season days are changing in two ways. First, the number of temperate transition season days are decreasing; secondly, these days are becoming more common in spring and decreasing modestly in fall. Diurnal shifts in apparent temperature show that the overnight period is warming more rapidly than the daytime, which may partially explain the seasonal shifts. Future work will expand this work to additional locations and using other thermal comfort indices.

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