You must return here before the fireworks finish, or you will melt in the heat of the summer eve.
10 seconds sound clip from the Rudolph and Frosty: Christmas in July movie soundboard.
You can hear this line at 00:26:38 in the Blu-ray version of the movie.
Quote context
[...]
- If Frosty, Crystal, Milly, and Chilly wear them about their necks, they cannot melt.
- Even though the temperature be hot enough to melt steel, still they will remain cool and icy.
- Wow! Our troubles are over forever!
- See. On each is a design. The letter F, four times entwined.
- Yeah! 'F', 'F', 'F', 'F'! What's that stand for?
- That means the amulet's magic only lasts until the final firework fades on the 4th.
- You must return here before the fireworks finish, or you will melt in the heat of the summer eve.
- Wow! He certainly does blow in and blow out.
[...]