They need to be open in the summer.
Open or closed attic.
My parents house has two small windows in the attic that open.
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It even rained and the sill got wet but not the floor.
Closed cell foam can also increase the racking strength of attic walls which.
Open cell foam has an r value of about 3 5 to 3 7 per inch while closed cell foam has an r value of about 6 per inch.
Would it be better to keep them closed to keep out rain or open to allow ventilation.
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.
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.
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After leaving the attic window open overnight it was amazing how cool it got in there.