Answer
If it snows, then it is not August.
Work Step by Step
RECALL:
The contrapositive of $p \longrightarrow q$ is $\neg q \longrightarrow \neg p$.
The given statement has:
$p$: It is August.
$q$: It does not snow.
Thus, the contrapositive of the given statement is:
If it snows, then it is not August.