To sign weather, form both hands into the ASL letter W sign as you make them face each other in front of you and shimmy them down a few inches in alternating directions.
Another sign for weather is to form both hands into the ASL letter W sign as you make them face forward, then wiggle them down in unison but as mirror images of each other.
Teach your toddler the weather sign when you begin to introduce the different temperatures to them, or when they become inquisitive about the different kinds of precipitation they have observed.
This is a useful flash card taught best in conjunction with the other flash cards pertaining to the weather elements and daily outside temperatures.
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