A thermometer initially at a steady temperature of $30\ ^\circ\text{C}$ is inserted in a water bath maintained at $90\ ^\circ\text{C}$. The initial rate of temperature rise of the thermometer is $2\ ^\circ\text{C s}^{-1}$. Assuming first order behavior, the thermometer reading (in $^\circ\text{C}$) after one minute is ______ (rounded off to one decimal place).