Hi pixils,
Your lights-on temps/humidity are fine if you're not into flowering stage. Temps could go another 5F but it's nothing to be too concerned about, just not ideal.
You need to get some heat or change your timing as suggested here already, or both to get the lights-off temps up. 50F will be detrimental for any length of time.
Lights off humidity at 70% is also a little high but not terrible or detrimental as long as you don't let it go much higher.
By increasing your lights-off temps, you'll drop humidity a bit and be good to go.
One thing which can bring your temps down (besides the environment that it's sitting in of course) during lights-off is having too much air intake from a cool room, reduce it or eliminate it during lights off if you're not using passive intake (e.g. assisted by a fan or the like).
I have a small tent I was using as a holding spot, in a temp area in my basement which was a bit cool at night, and initially had similar issues with low temps (mine got to 59 which I don't like) and high humidity lights-off like 80%.
A couple of reasons for it:
1) Too many plants or too large pots for the tent size
2) Initially had assisted intake with a booster fan, removed it, too cold. When it was on it would reduce temps below the ambient temp of the room it was in.
2) Insufficient exhaust to reduce the humidity
I bought a $10 4" fan, like those USB one's but with a power adapter. Placed it in my exhaust hole blowing out (poor man's exhaust in a small area) so in effect it acts as an exhaust. That brought the humidity down, but using passive intake the temps didn't drop.