USB stick miners if that is what you are talking about I suggest for learning but not ROI. OP would be better off buying BTC or a bigger miner then stick miners. They are fun but not cost efficient with so many parts for one chip in most cases. I don't know if with USB miners I would guarentee meaningful profits.
I think he would be better off with a S3 with cheap electricity. Or if higher electricity obviously a newer miner.
June would probably mark the start of the rainy season here in our country. It will be cold for sure.
What I'm saying is, those usb stick miners could probably be used to insta-mine promising altcoins just before they hit the exchanges. If you picked a pretty good coin, you will meet ROI and profit. Mining bitcoins directly with these cutesy little miners is a dumb move; mining altcoins with these hardware, however, could be a good thing to do.
The chances of picking a good coin are slim though. Most are pump/dump. And when a new coin comes out you would be competing against a lot bigger miner's. People even rent hash at launches. Nicehash/Westhash on a new coin that is half way decent will pay way over normal. Difficulty will skyrocket on the new coin.
USB sticks are for learning at this point. Just not enough hash even with "new" stick miners such as Avalon Nano. I have one get's over 4 GHs but it is for run I would never ROI on it. In my opinion.