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Some of my bees were flying yesterday in a light mist at 43 degrees. I think that it depends on their perception of need, the number of bees required to keep brood warm and the quality of the source that they have found.
 

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I've seen my bees forage on a bright sunny day of 43 degrees.
Me too, I have one hive that will be busy at 43 degrees on a sunny day and one that it has to be a solid 50 before they get moving at all; same location two different bee sources. The colder working bees are from a swarm.

RKR
 

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55 degrees F.
The above temperature is written in many books.
However, wind and time of day works into the answer.
My Russians and Carniolans are the 1st to fly
Ernie
 

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One must remember that advertised temps (local TV station) are taken in the shade, a sunny day @ 43 degrees is not 43 degrees to the bees in full sun.:D
 

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I don't expect to see them flying until it's 50 F and sunny. But I have, on one occasion seen a steady stream of them bringing in something when it was 27 F, sunny and calm (a rarity in my part of the country). I thought they had lost their minds. But then they are dark Northern bred regressed bees...
 

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The wind plays into it somewhat. I've observed my Carnies fly on a sunny day, with little wind in the low 50's (~53-55 F) .

Regards,
Tucker1
 

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It really depends on what you mean by forage. Does one bee every 30 sec or so constitute foraging or does it mean 5-10 per second? When I think of foraging, I think more along the lines of the latter ratio. Therefore, with this criteria, I would say that the temp would have to be about 55-60 degrees Fahrenheit to observe "foraging."
 

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27 fahrenheit and also bringing something in.

That will take the cake no one is going to try to beat that.

What I have seen is that Italians are pretty religious about the 55o thing, and Carniolans will start work about 3o less than that which can be a significant amount of time on a slowly warming morning.
 
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