Weather maths needs loads of maths, like temperature, humidity, moon phase, time and pressure. This weather monitor uses two sensors one which I placed outside, and one inside. From looking at my weather monitor, I can see the temperature outside is 8.1 degrees and inside the temperature is 21.7 degrees. That means it is 13.6 degrees cooler outside. The humidity outside is 79% and inside is 49% and I can see there is a 30% difference.
