It is in fact not unusual. The SHOT Show in Vegas got flooded out a couple years ago, and a mid-winter thaw is so common there's a name for it. The soothsayers who predicted the West would have a colder but drier winter got it bass ackwards.
Edit to add: Just took the garbage can to the curb. My driveway is absolutely COVERED with earthworms. Not a single square foot without one. All the snowmelt and now rain has forced them up out of the ground, apparently.
Worms gotta breathe too - doesn't work underwater. I remember times when I was a teen that we collected literally gobs of worms in the bottomlands of NDak, just by brushing aside the leaf litter after a soaker. The garter snakes et. al. gorged at such times.
Robins working the lawn under the sprinklers or in the rain have figured this out too.
21 below this morning. Again. Forecast is that we get 1 above for a high tomorrow, for the first time in a week or so, and warming from there, with several inches of snow coming.
I don't expect I'll find worms on my sidewalk.......