Liz and I took a long weekend holiday in Venice a few years ago – our first holiday abroad together.
We went in November for 4 days and there'd been flooding until a day or two before we arrived, though we had bright, crisp winter sunshine for our whole stay, until the afternoon we left when it started raining and the following week they had record floods.
In other words, we lucked out big time with the weather and it helped amplify an already lovely holiday. Going in November is great if you get good weather like we did: no tourist throngs or (from what I've read) smelly summer heat. One or two of the smaller places will be closed for winter and there may be fewer restaurants open, but the overall experience was so much more relaxed.
Today's photo is taken from one of the many bridges, Ponte dell'Accademia and you can see just how bright and sunny it was. Getting this level of sunshine in winter also comes with the added (colour) warmth of the sun being lower in the sky.