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Relative Humidity in London, England, Uk. 1  The average annual relative humidity is 79.6% and average monthly relative humidity ranges from 70% in June to 89% in December. The average annual relative humidity is 79.6% and average monthly relative humidity ranges from 70% in June to 89% in December.
What Is the Ideal Humidity Level? With all this talk of improving comfort, lowering energy bills and promoting cleaner indoor air, what humidity level should you aim for? In the summer, home humidity should remain between 30 and 45 percent. Measuring indoor humidity is easy with a hygrometer. This small, handheld instrument displays the relative humidity in the room. You can carry it around with you to different rooms and accurately measure the relative humidity throughout your home. Hygrometers are available at your local hardware store.