Ok, this is what I would consider an indication that it is cold outside.
If that doesn’t convince you, look at the (cold) hard facts.
The dogs think it is cold too and they both insist on sharing the same chair. I think this is the warmest spot in the bus for them. It is quite funny to see them argue over who gets to sit here and for how long. They usually end up sharing.
When not on the chair, they have been found sleeping in various other places.