> Except in very hot climates, honey bees do not forage early in the 
morning.
and
 > ...Most bee visits were between 10 a.m. and 4 p.m.

When it gets very hot, the bees stop foraging and stay home.  When 
pollinating canola in Southern Alberta, we noticed that if the day was 
very hot, they stopped work around 2 PM.

Around here, if the weather is right, the bees appear to be foraging 
until very near dusk.  That is one reason for large crops in the North 
-- very long days and short nights right around this time of year, and 
extending through July.

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