Can it be cold and humid? Yes, and here’s why

When most people think of humidity, they typically associate it with hot, sticky weather. However, humidity levels can actually vary greatly depending on the temperature. In fact, it is entirely possible for it to be cold and humid outside. In this article, we will dive into why and how it can be cold and humid, and what that means for different aspects of our lives.

The science behind humidity

Humidity is the amount of water vapor that is present in the air. It can be measured in absolute humidity, which is the actual amount of water vapor in the air, or relative humidity, which is the amount of water vapor the air can hold compared to the maximum amount it could hold at any given temperature.

When air is cooled, its capacity to hold water vapor decreases. This is because cooler air is denser, and denser air molecules cannot hold as much water vapor as warmer air molecules. Therefore, relative humidity increases as the temperature drops, even if the absolute humidity remains constant.

This is why it is possible for it to be cold and humid outside. As cold air has a lower capacity for holding moisture than warm air, it becomes saturated with water vapor more easily, resulting in a higher relative humidity.

The impact of cold and humidity on our health

Cold and humidity can have a significant impact on our physical health. When the air is both cold and humid, it can be difficult for the body to regulate its temperature. As a result, we may experience symptoms such as chills, goosebumps, and numbness. These symptoms are all indicators that the body is trying to warm itself up.

Cold and humid weather can also worsen respiratory conditions such as asthma and bronchitis. This is because cold air can cause the airways to narrow, making it more difficult to breathe. In addition, high humidity levels can create a damp environment that promotes the growth of mold and mildew, which can trigger allergies and asthma symptoms.

How cold and humidity affect our homes

Cold and humid weather can also have a significant impact on our homes. When the air is cold and humid, it can lead to the accumulation of moisture on windows, walls, and ceilings. This moisture can cause mold and mildew growth, which can damage paint, wallpaper, and other surfaces. It can also cause wood to rot and metal to rust, potentially leading to structural damage.

In addition, high humidity levels can make it more difficult to heat our homes. This is because humid air is denser than dry air, which means it takes longer to warm up. As a result, our heating systems may have to work harder and for longer periods to maintain a comfortable temperature, which can lead to higher energy bills.

How to manage cold and humidity in our homes

Managing cold and humidity levels in our homes is crucial for maintaining both our health and the integrity of our homes. Here are some tips for managing cold and humidity:

Use a dehumidifier

A dehumidifier can help to reduce moisture levels in the air, preventing the growth of mold and mildew. It can also help to reduce humidity levels, making it easier to heat your home.

Install proper ventilation

Proper ventilation is essential for removing excess moisture from your home. Make sure your bathroom and kitchen have proper exhaust fans, and consider installing a whole-house ventilation system if necessary.

Seal air leaks

Air leaks can allow cold, humid air to enter your home, making it more difficult to regulate temperature and humidity levels. Seal any air leaks around doors and windows to prevent outside air from entering.

Invest in insulation

Good insulation can help to prevent heat loss and reduce the amount of energy required to heat your home. Insulate your walls, attic, and basement to increase your home’s energy efficiency and to keep cold air from seeping into your home.

In conclusion

As we’ve seen, it is entirely possible for it to be cold and humid outside. Understanding how temperature and humidity levels are related is crucial for maintaining both our health and our homes. By managing humidity levels and taking steps to prevent moisture buildup, we can stay comfortable and healthy no matter the weather outside.

Common questions about cold and humidity

  • Can cold and humidity cause illness?
    • Cold and humidity can worsen symptoms for those with respiratory conditions such as asthma and bronchitis. However, it is typically not directly responsible for causing illness.
  • Why do my windows fog up when it’s cold and humid?
    • When warm, moist air comes into contact with a cold surface such as a window, it condenses into tiny droplets of water, creating foggy windows.
  • Is high humidity or low humidity worse for our health?
    • Both high and low humidity levels can have negative effects on our health. Low humidity can cause dry skin and nasal passages, while high humidity can lead to mold and mildew growth.


1. “Humidity,” National Oceanic and Atmospheric Administration, accessed August 5, 2021,

2. “Humidity and Your Health,” American Lung Association, accessed August 5, 2021,

3. “Indoor Air Quality,” United States Environmental Protection Agency, accessed August 5, 2021,

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