1. **State the problem:** The temperature in city A is two degrees below zero, which means $-2$ degrees. 2. **Identify the temperature in city B:** It is five times warmer than city A. 3. **Use the formula:** If temperature in city A is $T_A$, then temperature in city B, $T_B = 5 \times T_A$. 4. **Substitute the value:** $T_B = 5 \times (-2)$. 5. **Calculate:** $T_B = -10$. 6. **Interpretation:** The temperature in city B is $-10$ degrees, which means it is colder than city A, not warmer, because multiplying a negative number by a positive number results in a negative number. **Final answer:** The temperature in city B is $-10$ degrees.