My SPL meter shows ambient/background noise of about 41.x dB. Is that average, hi or low?

29 db using the DB Meter app on my iPhone 6S Plus

I was rather serious about noise control, both emanating from and entering the custom room I designed and built in my basement. Quietness was paramount. My measurements from three different phone apps:

Decibel Meter  30-32dB   (I presume this is weighted differently)

Noise Meter     16.8-17.2dB

Sound Meter    17-18dB  

Sound Meter compares the ambient noise in my room to a ticking watch. 
That is acceptable to me. The sensation of entering the room is not unlike entering a vault at a bank.  :) 

Great thread - lots of power conditioners get sold late at nite when it is just better acoustic signal to noise- kudos to this group who actually measure and have data ! Rare here on Audiogon 

Measuring our condo using A weight and slow response daytime numbers are mid twenties for background using a B and K mic into iPad running Studio Six Audio tools. My listening level is typically 60-90 db. Nights run low twenties