10 kg = 22 lbs
If you live in a cold climate with a large cluster of Italians, it's typical to leave them between 100 and 150 pounds of stores.
That cannot be true. Canadian aid says: "The total weight of two supers, lid, bottom, honey, pollen and bees should be at feast 125 pounds."http://www1.agric.gov.ab.ca/
Canada great plains: "Food consumption is low in winter until colonies begin to rear brood. Colonies can survive until early spring on less than 60 lbs."
In Finland if we get that much of honey it is a good yield. If we leave it into hive, what is the idea, and we even have not. In really cold climate honey yield is about 50-70 lbs.
I think that we have cold climate and long winter. 45 lbs sugar is enough for September to the end of May.
If you have uninsulated hives, consumption is 50% bigger = 68 lbs.
We are at the front of beekeeping. I suppose, it is cold here.
I have italians and they manage very well here. In my area temperature is normally over -4F.
If you have cold climate you need not much honey but
* insulated hives
* 1 or 2 deep for winter. No extra room.
* sugar instead of honey
* proper ventilation (no jars upp, or empty boxes or exluders)
* a bee stock that is able to over winter in that climate.
* not windy place
If you have really cold climate where temperature is for long period lower than -30F, we use some kind of shelter.