An author posted on Facebook recently that he was feeling a little panicked that his next novel idea wasn't coming. The season might have a lot to do with his feeling of being stalled.
Like the creek I walk by on my lunchtime constitutionals, this is a time of year for nature, as well as human endeavors, to feel blocked. Frozen. Eventually, the heat will return, and creativity as well as water will begin to flow again.
In the meantime, writers and other artists who are feeling locked up might consider working on more structural projects. Revise that manuscript. Submit that short story. Don't stop working. Just work on something requiring less inspiration. Lay down some groundwork that will pay off later, when you're in a fully creative zone again.