A Summer Cold

Okay, I've got my SECOND cold in three months.  This isn't supposed to happen.  I take vitamins.  I eat fresh fruits and veggies, and I wash my hands and use Purel. I always wipe down the grocery carts before I use them.

And I've got a SECOND cold in three months.

My throat is scratchy.  My nose is running.  I am MISERABLE.

Why does a cold feel worse when the weather is fine?