What if the weather is really terrible on that day?
What do we do in case of pouring rain or very low temperatures?
If rain is expected I advice bringing a colorful umbrella (not black!) or a raincoat. Sparkling pavements and reflections in the puddles will help us create fun photos. Rain is not a problem unless it's pouring rain with thunderstorm.
For temperatures lower than -15'c you'll need to dress in multiple layers, plus scarf, gloves or mittens, warm hat/bonnet and 2 pairs of socks (lifehack from someone who hates cold feet).
If it's really REALLY cold we can either change our program a bit (less outside time, more museums, shops and cafes). I often do little lectures/discussions about the city while sitting in a café waiting for the rain to stop.
If you are not ready for such challenges we can either hire a car with a driver to take us anywhere we want or we cancel/move the tour to another day.