Speed with cold engine?!

Hello, I have a Volvo V50 2.4i 170hp Bj: 2006 If the engine is cold and I start the engine the speed is 1500U/min for about 30sec. So if we had the winter now I would still understand it but not at the temperatures we have today. So I don’t know if that’s normal…..has jemad got a tip? MFG