Follow this link to see internal hive temperatures in a Minnesota hive. I don't know if this hive was wrapped or not. Also carefully read the comments. The thermocouple measuring the hive temperature was initially above the cluster and internal hive temperatures were close to the outside air temperature. For the last few temperature readings the cluster has moved up and is now surrounding the thermocouple and it appears the hive temperature has increased. But in reality it is now measuring the cluster internal temperature not the hive temperature.