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 .