How do I know?
1. Buds on the daffodils in the front yard; actual flowers on the other daffodil plants.
2. Unearthed my sandals from the depths of the closet, as it is now too warm to wear slippers in the house.
3. Removed the fleece sheets & down comforter from the bed, replaced with regular sheets/light comforter.
4. Wearing only one layer of clothing (not counting underwears).
5. Did not shiver & shake between shower & closet. Outstanding.