Bubblewrap might be better than clingfilm?
A less chilly though much longer route through Spain would be to head south east down the Ebro Valley to the coast then follow the coast to Almeria and cross to Melilla, see map at Wild Nature of the Cantabrian Mountains (Spain): Geographic Location
In our cave in the Spanish mountains it is currently 8ºC in the middle of the day, minus 4ºC overnight. On the coast it's 17ºC day, 7ºC overnight.
You could also take a ferry from Barcelona to Tanger Med.
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"For sheer delight there is nothing like altitude; it gives one the thrill of adventure
and enlarges the world in which you live," Irving Mather (1892-1966)
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