I am in MA and you are in NC but I will try to help.
Clover is anytime. I have used Momentum FX2 (gran) and worked very nice. A liquid will do better; That is all I use. Drive 75 works great, Confront (but new regs is a no-no), Dimension will, Elimanate will and many others.
Same with other weeds Momentim FX2 is nice and works very well. I would not use them in weather over 85 F though. Burns.
is a good site. Any 2-4-d will kill weeds etc. Clover is a pain but so far momentum FX killed 95% of it. Just some spot spraying now.