John Harlow wrote:

...Right now it vents
into the attic; when it warms up outside I will put a soffet vent in,
although my last house (much smaller attic) had one vented into the attic
with no ill effects.

....

Be careful to not wait too long for warm weather...cold weather
condensation can soak your insulation in a real hurry...as for no ill
effects previously, I'd consider that a real miracle or your previous
attic was extremely drafty.