I have been noticing for awhile now my bees are clustering outside the hive on 2 of the openings. One opening has a good size ball clustering outside. I read that it could be heat, congestion or ventilation. The temp has been getting colder the last few weeks, it's probably around 10 degrees Celsius, no frost yet. The bottom board has been off all summer so I don't think it is too warm inside the hive or ventilation being the problem so I'm thinking congestion... Where should I put empty top bars if this is the case? I don't think there is much space left and I'm worried about opening it up because it is getting colder. Actually we have had a lot of rain and drizzle lately and it will be in the forecast for the next few days..
Also what should I be doing to the top bars to get them ready for the winter? There is honey on both sides. Do you shift all the honey to one side?