Oh, Bother! Someone’s Grumpy

In Oh, Bother! Someone’s Grumpy (or Somebody's Grumpy) by Betty G. Birney, a snowy day in the Hundred Acre Wood causes the characters to become uncharacteristically grumpy. Christopher Robin helps his friends, including a particularly glum Eeyore, overcome the "Galloping Grumps" by spreading cheerfulness and rediscovering the fun in the cold weather.