![]() Dew point map of the United States, 4 Oct. But there’s an even better number to look at, and fortunately, weather apps show this number. You also need to know what the indoor and outdoor temperatures are. They see the outdoor relative humidity at 70% and say, “Oh, I should keep the house closed up now because that’s too humid.” There’s a better metricĪnd that’s wrong! Well, it might happen to be right accidentally, but you can’t look at the relative humidity by itself. In a humid climate, you don’t want to do that when the outdoor air is more humid than indoor air, right? But the trap many people fall into is looking only at the relative humidity. Opening the windows means letting outdoor air into your house. And the outdoor relative humidity at the time was about 90%. Gorgeous fall weather! About a week ago I opened one of my basement windows and put a fan in it to blow outdoor air into my house. Low temperatures in the low to mid 50s Fahrenheit (10-13° C), highs in the 70s Fahrenheit (25ish Celsius), and sunny. It’s humid and warm here now, but a week ago we had some nice cool weather. We still have humid days, though, so many people have the question: When is the humidity low enough to open the windows? I opened the windows to 90% relative humidity The weather is cooling off here in Georgia, so we don’t have to run our air conditioners all the time now. (See the related articles below for more.) But here’s an angle that I haven’t covered before. I’ve been hammering on this point for a decade in this blog, covering it in several different ways. Relative humidity is such a confusing way to talk about moisture in the air.
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