At noon on January 7, the temperature in Buffalo, New York, was 1 degree below 0°F, which means it was -1°F.
Since the temperature in Pittsburgh was 10 degrees warmer than in Buffalo, we can calculate it as follows:
\[ \text{Temperature in Pittsburgh} = \text{Temperature in Buffalo} + 10 \] \[ \text{Temperature in Pittsburgh} = -1°F + 10°F = 9°F \]
Thus, the temperature in Pittsburgh was 9 degrees Fahrenheit.