The air in there is frigid cold
I don't know what the reasons are
The calendar says August 1
But it's still winter in my heart

from The Avett Brothers – Winter In My Heart Lyrics on Rap Genius

Meaning

Even though August is a traditionally hot month, it’s still extraordinarily chilly within his ticker. Because he’s sad.

Jokes aside, the second line cuts to the core of this admittedly repetitive song. He can’t adequately explain what it is that’s making him sad, so he’s essentially repeating the lines “I am very sad,” over and over again, which would probably make him sadder; a vicious cycle that too many of us are familiar with.

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