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"The mud just boils out of the ground every spring," McKirryher said recently as he pondered how best to reach a mud-splattered mailbox 50 yards away. "It's like soup until the frost gets out, and then it starts stiffening up and gets sticky. It gets interesting."
The problem with mud season is not just that it exists, but that there is more of it.
New England winters have warmed on average more than 4 degrees Fahrenheit over the last 40 years, allowing spring melt to begin earlier and the ground to freeze later in the fall. Add to that an increase in winter thaws, mini-mud seasons that are a preview for the main spring event. It all adds up to more muddy days per year.
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http://www.boston.com/news/local/vermont/articles/2009/04/19/in_springtime_our_thoughts_turn_to_muck/