I though March weather is unstable. But this year April, too, is as much as or worse than March. One day, it hailed a lot.
Golden-crowned Sparrows have been around here for a few weeks before moving into the woods in summer.
"I am tough. I don't mind the cold weather at all."
After a couple of weeks of the cold spell, it finally changed to rain.
Guess what. All of a sudden, right when the warm rainy days came. So did many Yellow-rumped Warblers come into my backyard (it used to be only 2-4 at max here ; now I counted close to a dozen).
Yellow-rumped #1: "It's been cold this spring, so I didn't make it into the woods yet."
Yellow-rumped #2: "Yeah, that's why we all come here to nibble the suet."
I hope that's the reason.