Just in an afternoon, we've gone from winter to practically spring. Certainly, the early March snow persists in shady patches, but it was in the mid-50's (°F) this afternoon, so it shouldn't last much longer. And the prediction is for temperatures in the mid-70's for Saturday and Sunday.
It's hard to know what plants will make of this. It will depend on their genetic heritage, for sure, whether sudden (exceptional) warmth will encourage bud expansion or not. Most of our native plants are still dormant, an adaptive strategy that's probably serving them well in a changeable climate.