It's been 20+ years since I picked up a cold in the summer.  Being susceptible to germs in a new environment is normal.  New job, new city, new apartment, etc...

May I suggest a remedy?

I discovered Zicam years ago.  Zinc in any form works well.  The sooner you use, the better.  A downside of Zinc, it can upset the stomach.  In fact, I have an upset stomach right now.