• Friday

    Aug 14

    79°Lo 57°

    A thunderstorm in spots

    Very Unlikely for a snow day
    • Snow
      0%
    • Ice
      0%
    • Snow
      0 in
    more
  • Saturday

    Aug 15

    77°Lo 59°

    Afternoon thunderstorms

    Very Unlikely for a snow day
    • Snow
      0%
    • Ice
      0%
    • Snow
      0 in
    more
  • Sunday

    Aug 16

    78°Lo 60°

    An afternoon t-storm or two

    Very Unlikely for a snow day
    • Snow
      0%
    • Ice
      0%
    • Snow
      0 in
    more
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Londonderry Weather Report

PHOTOS: Severe Storms Slam Boston

August 5, 2015; 7:41 AM ET

A line of violent thunderstorms tore across Massachusetts, including the Boston area, Tuesday afternoon. more >

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The 540 Snow Line

Dec 20, 2012; 5:00 AM ET The 540 line is often used by meteorologists to determine the chances of rain vs. snow.