Living creatures know about spring. Both animal and vegetable. When I was young, when I sensed Spring, I couldn't do anything useful for a week, I had to just play and grow.
Spring officially began last March 21, but it's been weird here in the Northeast USA. Cold. Cold. Even when the high temperature of the day was high forties, it was only near the high for a few hours. Cold! Also gray and wet.
Yesterday I looked out at the morning. It was gray, cold and wet. But: I could hear many kinds of birds chirping, twittering and buzzing in the background. And I could smell it – greenery, growth, Spring! “Today, Spring begins!” I said to my wife. That was yesterday. Today, it's warm, mild and sunny. I was right.