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Can Cold Weather Really Make You Sick?

January 21, 2026

As soon as the first sneeze of the season strikes, it’s easy to blame the cold weather.

But here’s the truth: it’s not the chill in the air that’s making you sick — though many people still wonder why they seem to get sick more often in cold weather.

“Understanding what’s really behind those sniffles can help you protect yourself all season long,” says Taylor Abelli, MD, with Hartford HealthCare Medical Group.

Here’s what’s really going on.

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Viruses are the real culprit

It’s not the cold sneaking into your system — it’s germs.

Colds are caused by viruses like rhinoviruses or coronaviruses. And winter happens to be the perfect time for them to spread.

“When people spend more time indoors — in classrooms, offices or holiday gatherings — viruses move more easily from person to person,” says Dr. Abelli.

So when coughs and sniffles start making the rounds, it’s not the thermometer to blame. It’s probably your environment.

> Related: Can Chicken Noodle Soup Really Cure My Cold? 

But cold weather sets the stage for illness

We get it — the timing looks suspicious.

But here’s the thing: cold weather itself doesn’t infect you, it just sets the stage. Dry, chilly air sucks moisture out of your nose and throat, making it harder for your body to trap and flush out germs.

“When your nasal passages are dry, viruses can attach and cause infection more easily,” says Dr. Abelli.

Add in the fact that your immune system may slow down slightly in colder temperatures, and suddenly the weather seems like the bad guy.

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These habits help germs spread

This one might sting: the real problem isn’t the weather — it’s your habits.

“Good hand hygiene and avoiding face-touching are some of the best defenses against colds,” says Dr. Abelli.

Even small steps matter. Cover your cough, sneeze into your elbow and wash your hands often.

> Related: What to Eat and Drink for a Cold

5 ways to stay healthy all winter long

Want to stack the odds in your favor? Try these simple habits:

  1. Wash your hands often. At least 20 seconds with soap and water.
  2. Avoid touching your face. Germs enter most easily through your eyes, nose and mouth.
  3. Disinfect high-touch surfaces. Phones, doorknobs, keyboards — give them a regular wipe-down.
  4. Get enough sleep. A rested immune system is your best defense.
  5. Stay active and eat well. Exercise and balanced nutrition keep your body resilient.

And remember — you don’t get sick because of cold weather, you get sick when viruses take advantage of it. A few smart habits can keep you healthy, no matter how chilly it gets outside.