... the seasons are off about 4 to 6 weeks, coming early.
http://www.weather.com/news/nasa-spring-advancing-faster-20120503
"The extreme warmth during March of 2012 launched 25 states east of the Rockies to their warmest March on record. Trees and plants responded accordingly and got off to an unusually fast start on their bud, leaf and flower production this spring. In some locations around the Great Lakes, this early emergence was 4 to 6 weeks ahead of schedule!"
This could be accounted for by several reasons, one of which could be the increasing tilt and consequent increase in solar reflectivity.
https://earthchanges.ning.com/forum/topics/idaho-issues-frost-advisory
