Some use the old "RST" scale for reporting signal quality... of course "T" only applies to morse code, but "R and S" are useful indicators.
https://en.m.wikipedia.org/wiki/RST_code
You might find this site of day and night patterns for AM stations useful:
http://www.nf8m.com/patternmaps.html
Or for more technical detail on a given station, the FCC has it here:
https://www.fcc.gov/media/radio/am-query
Enhanced propagation can occur along the "grey line", around sunrise and sunset, so the gery line map is a useful tool:
http://dx.qsl.net/propagation/greyline.html
I agree with EM about finding a quiet spot or using an outside antenna, but a lot can be gained towards making your residence quieter, by using a small portable to track down the worst offenders and turing them off or installing ferrite line filters.
Radio jayallen has a wonderful site, and I tend to agree with his findings... it is interesting that some very vintage radios rate quite well, holding up favorably in comparison to the latest hot offerings from Sangean and others.
have fun!
jr