A lovely song generally, but Heaven is not a moment.

A snowbird can't talk about flowers or anything else. (If it were a parrot, then maybe so!) It can't understand a human's command to spread its wings and fly away. If it does fly away in response to a human's voice, then the bird is likely startled or feeling intruded upon. A bird can't take snow anywhere, other than a very small amount that might be on its body. And a bird can't understand that a human would like to fly away with it.

This statement is ambiguous, and therefore without clear meaning. That is because pronouns normally take antecedents, but the pronoun "it" does not necessarily take any antecedent when referring to weather. One can say, for example, "it is cold", it is windy", "it is sunny", "it is snowing", etc., and "it", without any antecedent, is understood to refer to weather, generally. But occasionally ambiguity is possible when there is a reference that is a possible antecedent for "it". In the line above, "my hand" is a possible antecedent, so the ambiguity is as to whether "it was cold" refers to the singer's hand or to the weather. And nothing about the sentence structure itself can resolve that ambiguity.