Getting Wet in the Cold Won't Give You a Cold — Viruses Will, and They Don't Care About the Weather
Getting Wet in the Cold Won't Give You a Cold — Viruses Will, and They Don't Care About the Weather
Somewhere in America right now, a parent is telling a kid to put on a coat before going outside or they'll catch a cold. Another one is scolding a teenager for leaving the house with wet hair in January. These warnings feel like basic common sense — the kind of practical knowledge that gets handed down through families like a family recipe or a piece of furniture.
The only problem is that none of it is how colds actually work.
The link between cold temperatures and the common cold has been scientifically discredited for over sixty years. And yet the belief is so deeply embedded in American households that it shows no sign of going anywhere.
What Actually Causes a Cold
The common cold is caused by a virus — most often one from the rhinovirus family, which accounts for roughly half of all cold infections. There are more than 200 viruses capable of producing cold symptoms, but rhinoviruses are the main event. They spread through respiratory droplets when an infected person coughs, sneezes, or breathes near you, and through contact with contaminated surfaces followed by touching your eyes, nose, or mouth.
That's it. That's the mechanism. A virus has to enter your body. Temperature is not a variable in that equation.
Researchers confirmed this through direct testing as far back as the 1950s and 1960s. In studies conducted at the Common Cold Unit in Salisbury, England, volunteers were exposed to cold viruses under various conditions — some chilled, some wet, some both — and the results were consistent: exposure to cold temperatures or wet conditions alone did not cause infection. The people who got colds were the ones exposed to the virus, regardless of whether they were warm and dry or cold and drenched.
Photo: Common Cold Unit in Salisbury, England, via salisburyhealthcarehistory.uk
More recent research has continued to support this. A 2005 study from Cardiff University dunked one group of participants' feet in cold water and left a control group dry, then monitored both groups over the following days. The cold-water group reported more cold symptoms — but researchers noted this was likely due to pre-existing viral exposure becoming symptomatic rather than the cold itself triggering infection. Even that study's findings have been debated, and no credible mechanism has been identified by which cold exposure alone generates a viral illness.
Photo: Cardiff University, via www.studentworldonline.com
So Why Does It Feel Like Winter Makes You Sick?
This is the part of the story that actually makes sense of the confusion. Cold weather doesn't cause colds, but it is genuinely correlated with more of them — and that correlation is real enough to keep the myth feeling true.
The reason is behavioral, not biological. When temperatures drop, people move indoors. They spend more time in enclosed spaces with recycled air, closer to other people, for longer stretches of time. Schools, offices, shopping malls, public transit — all of these become environments where respiratory viruses circulate more easily. The virus is still doing the work. The cold weather just herds everyone into the same room.
There's also a separate factor related to the virus itself. Rhinoviruses actually replicate more efficiently at temperatures slightly below core body temperature — around 91 to 95 degrees Fahrenheit — which happens to match the temperature inside the nasal passages during cold weather when you're breathing cold air. Some researchers have explored whether this gives the virus a mild replication advantage in winter conditions, though this remains an area of ongoing study rather than settled science. Importantly, even if that mechanism plays some role, it still has nothing to do with getting wet or going outside without a hat.
Low winter humidity may also play a role. Dry indoor air can dry out the mucous membranes in the nose and throat, potentially making it slightly easier for viruses to establish a foothold. Again — not the cold itself, but a consequence of the conditions that come with winter.
How Folk Wisdom Outlasts Medical Evidence
So if researchers have understood the viral cause of colds since at least the mid-twentieth century, why does the cold-weather myth remain so alive in everyday American life?
Part of the answer is that the correlation between winter and colds is real, even if the causal explanation is wrong. When something reliably follows something else — cold weather arrives, cold season begins — the human brain is wired to connect them causally. That's not a flaw; it's usually a useful cognitive shortcut. But it doesn't always lead to accurate conclusions.
There's also the role of parental transmission. Cold-weather warnings are taught early, repeated often, and reinforced by the fact that kids do seem to get more colds in winter. Children are in school, sharing close quarters with dozens of other children, all of whom are touching the same surfaces and breathing the same air. Of course they get sick more in winter. But the lesson that gets passed down is 'you went out without your coat,' not 'you spent six hours in a classroom with a kid who had a rhinovirus.'
Medical professionals have been pushing back on this myth for decades, but public health messaging rarely travels as fast or as memorably as a parent's warning delivered with authority on a cold morning.
The Takeaway
Dress warmly in winter because it keeps you comfortable and helps prevent hypothermia. Dry your hair before going out if you prefer. But do it for your own reasons — not because of any risk of catching a cold. The virus that causes your next cold is already out there, hitching rides on doorknobs and elevator buttons and the hands of people who forgot to wash up. The temperature outside is not involved in the transaction.