We took a couple of friends to the airport in Alicante this evening. When we left our house in el Culebrón, it was 5ºC. When we got to our pals in Crevillente, which is close to the coast, it was 10ºC and it was 11ºC at the airport in El Altet. By the time we got home it was 0ºC in Culebrón.
Culebron is 600m above sea level (1968ft), Crevillente at 131m (429ft) and El Altet at 30m (98ft). It just shows what a gentle gradient can do!
The snow on our palm tree is from last January. No settled snow yet this year.