On warm sunny winter days where the heat is able to penetrate into the hibernaria of snakes and lizards, they will come out and bask. They will also sometimes drink. As soon as the sunny weather disappears, so do the reptiles. It will do it no harm whatsoever to put it outside now. I assume you have an appropriate spot for it to brumate in the pit. So long as it is lively enough to crawl into it, I don’t see a problem.
To my mind, if the animal wants to brumate, then irrespective of where it is kept, the temperatures should be reduced accordingly. This ensures that the body chemistry (metabolism) slows down and the animal uses minmial stored internal resources to see it through the winter period. In other words, if it goes into brumation in good condition, it will come out of brumation in good condition.
It seems likely that for some animals changing day length is a stronger stimulus than temperature in inducing brumation. Whatever the cause, it is not unusual. Antaresia pythons are well known for going into brumation despite maintaining normal temperatures day and night.
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