we try to harvest our beans  at  14 or so  as to not get as much shatter loss.    (we put them in  a bin  with air)

some of ours  started  out   at 14  in the morning and by  5pm were  11%    it was  a  cold day too.   just sunny    

we  have not seen 70  here for  what  3wks ...  maybe 1 day  once it  was 69...

we hauled  3 loads off     one was 13.5  next 12.7  last  13.2 ....    not much chance of getting what  you want it to be  LOL!