City Hall wants your best photos of New York City's sweater weather.

The de Blasio administration wants New Yorkers to serve as Instagram ambassadors by using their cameras to take the best snapshots of the fall weather for its #AutumnInNYC contest.

Like with the previous #SignsOfSpringNYC effort, shutterbugs and smartphone photogs alike can send their submissions online at nyc.gov/autumninnyc with a simple Web form by Nov. 1.

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"Fall is a glorious time to be in New York City," first lady Chirlane McCray said in a statement Monday. "The crisp air and changing leaves offer much to rouse the creativity that is the lifeblood of New York."

A panel of judges that includes McCray, former Brooklyn Borough President Marty Markowitz and a host of commissioners from across the administration will select the winners by Nov. 7.

Each borough will get its own ambassador, with their best photos to be showcased on the Instagram account on Nov. 14 and throughout the administration's social media network.

"I've no doubt that photographers across the five boroughs will capture this beautiful season through their own unique perspectives," McCray added, "bringing a variety of views to represent our multi-cultural city."

Not ready for fall? Look over some of the #SignsOfSpringNYC submissions from earlier this year.