I live in the foothill country of the Cascades S.E. of Seattle. We are getting same same temps (after I converted). I leave my slider in the top slots year around. That lower slot isn’t for us. That lets in too much cooler air n causes the bees A.C. Issues…
Our bees keep the hive at appro. 94 dgs F for best laying n brood rearing. If the need it cooled you should see breeding (lots of bees hanging out on the front porch or front of the hive. This is very normal n a unique experience your first few times. Bees will bring water inside the hive n fan to create air circulation n the cooling they want. Be know BEST !
I have two Flow-hives n 7 other SBBoard hives. In our moderate climate it’s not good to lower ! All this has been discuss somewhat on here in the last few days as the Wx warms up across the Northern Hemisphere.
Sounds like your colony is doing well. Do you have a second deep super with frames ready to go one soon (not the Flow-super). In our northern climate you’ll need that second box to supply your girls with their winter needs of honey .
As you know we have a long gray damp, cool winter up here so 60 to 80 lbs of food us needed for the girls to safely survive. Are the large wild blackberries in full bloom up there yet. My local blackberries are at about 70 to 80% our here now. Hoping for a longer 3 week blackberry forage thus 2018 season.
Cheers n good luck ,