Is 45% Relative Humidity Too High?
No, it is perfectly normal.
What does 45% humidity mean for your home?
A relative humidity of 45% is right in the ideal "Goldilocks" zone of 30% to 60%. This is the perfect balance for human comfort, immune system health, and home preservation.
How to fix it
You do not need to take any drastic action. Continue to monitor the humidity as the seasons change or if you notice condensation on your windows during sudden temperature drops.