$⟨\leftarrow ,-1⟩$ : decreasingly increasing
$⟨-1,0⟩$ : increasingly decreasing
$⟨0,1⟩$ : decreasingly decreasing
$⟨1,\to ⟩$ :increasingly increasing
max. $y(-1)\approx 4$ and min. $y\left(1\right)\approx -4$
In $(0,0)$ the rate of decrease is largest, the slope steepest.

$\langle \leftarrow ,-3\rangle$: decreasingly decreasing
$\langle -3,0\rangle$: increasingly increasing
$\langle 0,3\rangle$: decreasingly increasing
$\langle 3,\to \rangle$: increasingly decreasing
max. $y\left(3\right)=27$ and min. $y(-3)=-27$
In $(0,0)$ the increase is fastest, the slope steepest.

There is a maximum temperature at 2:30 pm, then the curve goes from increasing to decreasing.