Answer: Its soluble.
Explanation: You could do an experiment take 100mL of water cool the water to 5 degrees Celsius or heat it and see how much dissolves. You should find more dissolves in the warmer water. Sodium chloride is an ionic solvent and so it should be fairly soluble. At 20 C, 35.7g dissolves and at 100 C 39.1g should dissolve in 100 mL of water.