At least in here in La Palma the temperature never falls below 5C, and that figure only exceptionally. I have experienced 7C on this visit, but that is unusual too and the lowest I have ever encountered. “Here” is Tacande at an altitude of 760m. Up on El Roque it falls well below zero every winter.
I am also fortunate here in having a warm and lit control room, well-equipped with a kettle.
Having spent many hours below freezing outside in the UK, with only a cat on occasion to keep my hands warm (another long story), I know well what you mean.