Any tips on what type of clothing to bring to Florence, Italy?

Is there winter like New York winters? And does it get hot enough to bring summer clothing?

Early Spring – Temperate weather, moderate airfare and hotel prices, moderate crowds
Late Spring through Early Autumn – Highest heat, airfare, hotel and other prices, as well as biggest crowds
Late Autumn – Temperate weather, moderate airfare and hotel prices, moderate crowds
November through March – Most unpredictable/cold weather, lowest prices on basically everything, smallest crowds

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