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The original was posted on /r/homeassistant by /u/Minechris_LP on 2025-06-10 12:58:44+00:00.
Above you can see my humidity sensors at home, but I always found it difficult to extract usful event from such noisy data, because the outside humidity affects it so much. Because I have some knowledge in data analysis, I have experimented a bit and found something very useful, I would like to share for the community.
Humidity average of all sensors
At first I created a helper to calculate the average humidity from all sensors. Then I made another Template-helper that took the difference (humiditiy - average humidity):
{{(states('sensor.sensor_bathroom_humidity')|float)- (states('sensor.appartment_humidity_average')|float)}}
This resulted in every room having relative humidity sensors:
Humidity sensors with substracted humidity average
This way I can now easily see spikes in humidity in the kitchen (blue) and the bathroom (yellow). This worked so well, I can detect water boiling for a tea from 2 meters away from my sensor location.
Final sensors of kitchen (blue) and bathroom (yellow) humidity only
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