I'm not picturing a large temp difference, maybe 10 degrees? Just enough to get above the indoor dewpoint.
Condensation in bathroom after woodstove install
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But it won't decrease the absolute humidity, which is what determines the dew/condensation point.
True, that remains the same but typically, absolute humidity is lower in winter. Cold air holds less moisture, right?
I'm going on the assumption that this was not an issue until the woodstove was put in. That seems to be what the OP implied. If so, this sounds like the central heating system is no longer kicking in and thus the far reaches of the house are colder. If this wasn't an problem before the woodstove was put in, then raising the bathroom temp up to where it was when the central heating was heating the house in winter, may be all it takes. It's easy to test for a week or so in winter. Just put a 100watt lamp in there or a small 500w space heater on a thermostat.
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What I got from the OP is that with the central heat kicking on less often, the *basement* is now colder, leading to a colder supply water temp which is causing the toilet to sweat.
Same impression, thus my post #5 comment. A side benefit is that the bathroom will be more comfortable too and less likely to have mold developing.
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