I just moved into a brand new house in January, but the outside spigot water pressure is
Low. The water pressure in the house is fine. How can I solve this problem? Thank you.

In areas that can freeze, most outside faucets have an individual shut off to close them in the winter. Find if there is a valve and see if it is fully open. You also may have debris in that valve and may have to disassemble it to flush it out.