I concede that I should have not been so confident with saying that more colds happen in winter due to the temperature drop, as the alternative theory from your source seems very plausible.
After a bit of research it's clear that my assumption about Andy was harsh - I shouldn't have used the word "probably". Although a lowered resistance can often be the factor that allows the cold to succeed in its attack, I understand that in many cases our resistance is futile.
Surprised to see no evidence that generally being cold makes you more susceptible to catching a cold... I can't remmeber a time where I have had a cold and it didn't immediately follow me being uncomfortably cold at some point on the previous day. I admit this could be a coincidence but every time I get a cold, it's almost always been a combination of being cold with higher sugar intake than usual and obviously being around someone with the cold
You don't catch a cold because you are cold
That's one of the biggest myths going. Cold viruses just thrive better in the lower temperatures.