Think more of temperatures at 50 oF or 10 oC when bee start to fly , they then carry on flying till about 10 min before official sunset or if the temperature drops below the magic 10 oC or 50 oF .
Bees will also fly in very strong reflected sunlight providing there is fairly still air round the hive .….. like a very on sunny day when there is snow on the ground .
The hive & strimming ..
I found that on very hot day's like today at 29 oC bees the were too busy cooling the hive and trying to obtain nectar to bother with the strimmer if I was more than 2 mtrs away. But do that on a cooler 14 oC day and the beggers would go crazy if I was within five metres of their hive or one of the apiary set ups . They were trying the sting the HT lead & the rubber spark plug shroud long before they had a go at me. Evidently it's not just the pulsating noise ofyour strimmer nor it's oily 2 stroke smell but usually it's the magnetic pulsing of the HT electricity in the HT circuit .
I solved my problem by weed spraying for 2 mtrs round the hives whether stand alone's or in a whole apiary .. It also prevented any fire hazard happening from the use of the smoker as there was nothing growing to burn .
Though one year that came back to bite me in the bum .. the dusty soil was light silt and it reflected the sun ( It was also in the 30 oC's ) which caused several hives to melt down & start liquid honey running out the entrance .
Curious as to what would happen …. I left them to it after putting some wooden posts in and cable tying a hessian wall along them on the sunny side of the hives.
Within a few days they had remade their wild comb on the frames & got going again , the queen egg laying like mad & the workers foraging or the hive bees storing stores etc.
My pal was not so lucky , he had 20 hives in the corner of a newly combine harvested wheat field which bounded by a very tall thick woodland mainly of holly , conifers & hawthorn hedging, full of brambles it was a fantastic midday to late after noon suntrap .. Every one of his hives was cooked to it's death .