A honeybee colony survives winter by clustering for warmth and slowly
consuming stored honey. If stores run low before spring, beekeepers add
emergency feed directly above the cluster so bees can reach it without
breaking formation in the cold. Each frame in the hive box is a store of
food; darker amber frames are fuller. The moving dot cloud is the bee
cluster — it tightens in the cold and spreads out to feed when food and
temperature allow.
stores(t+dt) = stores(t) + feed_rate·dt − consumption(T, colony_size)·dt
consumption ↑ as T ↓ (bees burn more honey to generate cluster heat)
- Feed method — syrup is taken up fastest in mild weather; fondant and candy boards work in cold weather because bees don't need to evaporate water from them.
- Feed rate — how much emergency feed is being supplied per day, topping up the honey store.
- Outside temperature — colder means the cluster burns honey faster to stay warm, and below ~10°C bees struggle to break cluster to reach syrup.
- Colony size — more bees means more mouths, but also a bigger, more efficient heat-generating cluster.