Is spring getting longer? Lengthening ‘vernal window’

Source: Science Daily

When spring arrives, temperatures begin to rise, ice is melts, and the world around us starts to blossom. Scientists sometimes refer to this transition from winter to the growing season as the ‘vernal window,’ and a new study shows this window may be opening earlier and possibly for longer.

https://www.sciencedaily.com/releases/2017/03/170316125628.htm