Weather is never predictable but February is normally the coldest month to tour Spain. Apart from Switzerland, Spain is Europe's most mountainous country with huge swathes at altitude and low winter temperatures.

Have a look at today's forecast for Valladolid: https://weather.com/en-GB/weather/te...cb227a66bbc471 and focus not on the maximum temperature (6-11ºC) but on the overnight lows which get down to -5ºC. If it's been that cold overnight it could remain below zero until lunch time. And Valladolid is only 700m above sea level—we have a property at 1,000m in the Altiplano de Granada and that will be colder than Valladolid.

Places near the coast will generally have better weather, partly through closeness to the ocean/sea, but mainly through being at low altitude. The major river valleys are at lower altitude so hopefully warmer, for example the Ebro which runs 300km, south east from Miranda de Ebro past Logroño (lovely), Bárdenas Reales (pseudo desert) and Zaragoza to the Mediterranean.

I related on another thread about seven of us riding through Spain to follow the Dakar Rally in Morocco. Six of us had electrically heated jackets, able to dial in the temperature we wanted. The seventh guy was so cold he got his wife to buy a jacket and ship it to a hotel in Algeciras for the return journey. At that time of year I travel with handlebar muffs and sometimes gauchos to protect the lower body.

Generally forget camping, most camp sites will be closed and with 14 hours of darkness each night it's an awful long time to lie shivering in a tent waiting for dawn. Look for inexpensive hostels (€30-40) at truck stops at the side of main roads, they will have a welcoming bar downstairs with a great value menu del dia (€10-12) including wine or .

So that's the downside, but you might be fortunate and find warmer weather.

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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)