an hour ago
The weather plays a role in when and how we get sick—but not in the way you might think.
Humidity levels can help those droplets whiz through the air quicker: the lower the humidity, the more moisture evaporates from the droplet, shrinking it in size so it can stay airborne for larger distances. Cold weather is notoriously dry, which explains why we’re more likely to catch a cold while we huddle up inside when temperatures start sinking. This type of air can dry out the mucus lining in our nasal passages; without this protective barrier that traps microbes before they enter the body, we’re more vulnerable to infection.
So we’re weakened by the air we breathe in when it’s chilly out, not the chilly weather itself.