Four seasons changing (IMAGE) American Geophysical Union Caption Changes in average start dates and lengths of the four seasons in the Northern Hemisphere mid-latitudes for 1952, 2011 and 2100. Credit Wang et al 2020/Geophysical Research Letters/AGU. Usage Restrictions None License Licensed content Disclaimer: AAAS and EurekAlert! are not responsible for the accuracy of news releases posted to EurekAlert! by contributing institutions or for the use of any information through the EurekAlert system.