What will be the temperature around November 10 during day and night?
Approx rent for a car (innova) to pokhra from Kathmandu ?
I suggest checking wunderground and accuweather for historic data and forecasts nearer the time.
No idea on the car charge and as far as I'm aware it's not possible to rent a car without a driver in Nepal.
My Nepal Pages https://wanderingeric.org/category/nepal/