Well, Farley IS involved and Elly is pissed but other than that, it's another 'children are an intolerable burden' strip.
Panel 1: We see Mike, Farley and Lizzie coming in from a walk outside tracking in dirt because, guess what, they don't know any better. Mike's cheery "Hi, Mom!! Don't you just love spring?" is greeted by the Bug-Eyed Glare of Existential Terror because (gasp) the three of them are making a mess that would take a normal person five minutes to tidy up. The fact that Mike doesn't pick up on his mom's being filled with despair means he's either dim or so used to her acting like the world is coming to an end, it no longer registers.
Summary: Elly, as we've seen, is anything but normal; this mildly upsetting phenomenon will leave her paralyzed with fear, doubt and self-hatred for hours if not days. As for the offsprings, they'll eventually learn to hate spring too; if Elly can't enjoy something, you can bet your shirt she won't let anyone else do so.