The Dew Point

And Everything You Need To Know About Dehumidification

Operating a grow? Then knowing how the dew point impacts your grow's environment is essential to keeping your plants healthy and becoming a master grower.

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This guide will explain what the dew point is, how to calculate it, and how to dehumidify a room. With this knowledge, you’ll become better equipped to maintain your grow room environment effectively.


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The dew point is an absolute measure of water vapor in the air.

As temperature changes, the amount of water the air can hold changes. Hotter air holds more water while colder air holds less. As the temperature goes up, the relative humidity decreases — and you effectively reduce the risk of condensation. 

By controlling the moisture levels and temperature of your grow room, you'll keep your crops safe from serious problems like bud rod, mold and mildew, as well as equipment failure.

In this guide, we'll cover: 

  • Dew Point vs. Humidity
  • Daytime Environment vs. Nighttime Environment
  • Preventing Condensation 
  • Temperature, Humidity, and Dew Point
  • Dehumidification 
  • Calculating the Dew Point
  • Dew Point at Every Stage of Growth
  • Mold and the Importance of Dehumidification 
  • Monitoring Dew Point & Humidity