Boiler pressure more than 20 psi

I just checked the pressure of the boiler and I see that it exceeds 20psi, it is somewhere between 20 and 25 (not easy to see from an angle), I am wondering if this is normal;
My boiler is a gaz boiler heating water and it indicates 50psi Max;
Is it ok to have such high pressure during Cold weather? how can I reduce it if I have to? I am looking over the internet but nothing clear found.

Thank you,