Flying Dodo
It'll soon be summer
Sadly, my hoped for warm spell before Christmas hasn't arrived! A lot depends upon exactly how cold it gets. For example overnight Gatwick dropped to -1, but it was above freezing to the south and west of there.
Once you get out into the countryside past Gatwick some of the roads are damp due to run-off from the fields, so if it is going to be several degrees below freezing, an option would be to stick to the main roads after Horsham, and so take the A264 and then the A29 and then drop down on the A284 into Arundel, and carry on as before.
Once you get out into the countryside past Gatwick some of the roads are damp due to run-off from the fields, so if it is going to be several degrees below freezing, an option would be to stick to the main roads after Horsham, and so take the A264 and then the A29 and then drop down on the A284 into Arundel, and carry on as before.