If you want to compare pH values measured at different temperatures you need to use a function called solution temperature compensation. Solution temperature compensation converts the pH at the measurement temperature to the pH at a reference temperature. The reference temperature is almost always 25°C.
At 100°C, the pH of pure water is 6.14, which is "neutral" on the pH scale at this higher temperature. A solution with a pH of 7 at this temperature is slightly alkaline because its pH is a bit higher than the neutral value of 6.14.
Similarly, you can argue that a solution with a pH of 7 at 0°C is slightly acidic, because its pH is a bit lower than the neutral value of 7.47 at this temperature.