Do they tend to eat less when it's real hot?
I have not observed any slow down in feeding activity in hot weather.
Our HSB and CNBG are in a feeding frenzy mode in hot weather - I set the timers for coolest past of day - early morning and late evening.
I have read so much on the forum about risks in overfeeding in expreme heat and cold that I turn the feeders off when I'm not able to observe.