Would it be better to keep them closed to keep out rain or open to allow ventilation.
Open or closed attic.
Although air should circulate year round through the attic your house will probably be more comfortable if you cover the foundation vents in the winter.
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When the attic becomes part of the home to be heated and cooled open wall gable vents and roof vents are no longer feasible but the underside of the roof the sheathing and rafters can still.
After leaving the attic window open overnight it was amazing how cool it got in there.
To provide background the house has a hot unfinished attic with blown cellulose and fiberglass insulation beneath the floor and no insulation along.
Closed cell foam can also increase the racking strength of attic walls which.
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My home has a whole house fan installed in the upstairs hallway ceiling when its cool at night that thing can suck the heat out of the house in record time.
They need to be open in the summer.
It even rained and the sill got wet but not the floor.