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To turn on or off a variable in the graph click on the black button on the right side.
To zoom in or out on the graph use to fingers and bring them together, or pull them apart.
To move on the graph hold your finger down and slide in the direction you want to go.

Trends

Notice that humidity and temperature are often opposite, this is because cooler air can hold less moisture. When does precipiation occur in relation to humidity and temperature?