Which methods are most accurate in making forecasts? Why do you think so?

I'd say the Barometer.

Explanation:

Because it determines what front is approaching resulting in the weather forecast.

usually using the barometer helps because it determines what front is approaching resulting in the weather forecast

Explanation:

Weather forecasts are often very accurate, but sometimes there might be an unexpected change in one of the variables, causing a mistaken prediction

not only is it colder, it also becomes darker, less salty, and more dense.