Possible Duplicate:
Is time of the year a factor on the risk of catching a common cold?
I've heard this from my father and I feel like I've experienced it personally, but I can't tell whether or not it's confirmation bias.
The idea is that when the weather starts to change (mid-fall or mid-spring), you're more likely to get a common cold. Is there any science to back this up?
Note - I'm not simply asking if cold weather makes you sick, the idea is that the fact that the weather is changing is what makes you sick.