105 is way to high for 62 , i was just in my attic its 74 out and maybe
78 in the attic. Of course you wont see high humidity , humidity goes
down as the temp rises. The concern is temperature Differential between
the attic and the outside. That is where conensation forms , at the
Coldest spot. Your roof deck. Just like windows condense water in the
winter the same is happening in your attic.
Ultimatly your attic should be no warmer in winter than the outside, or
condensation will form, than mold than rot. VENTILATE as others said
before. And bleach in a garden sprayer will kill the mold After you
ventilate.