Ontario’s Serpent River Weather Station consists of a rock suspended by a cord. An accompanying sign explains:
If the rock is wet, it’s raining.
If the rock is swaying, it’s windy.
If the rock is hot, it’s sunny.
If the rock is cool it’s overcast.
If the rock is white, it’s snowing.
If the rock is blue, it’s cold.
If the rock is gone – Tornado!
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