The highest temperature recorded in the same city during the past year was 304.89 K. What was the temperature in degrees Celsius?

578.04 °C

Explanation:

The temperature is given in Kelvin which has value = 304.89 K

Kelvin and Celsius are both units of the temperature which can be incontrovertible.

The conversion of T (K) to T (°C) is shown below:

T (°C) = T (K) - 273.15

Given that = T (K) = 304.89

So,

T = (304.89 + 273.15) °C = 578.04 °C

The temperature in degrees Celsius is 578.04 °C.