This can be a little bit confusing but in general, blues, greens and violets are cool colours and your reds, oranges and yellows are warm.
Cool Blue - Warm Blue
Where it gets confusing is that each primary colour can be warm or cool, a cool blue Pthalo Blue is cool as it leans towards green and a warm blue Ultramarine Blue is warm as it leans towards red, i.e.it is not a perfect primary but has a little red pigment within it.
Temperature = Mood
Depending on the overall colour scheme of your painting will define the mood.
The colours here produce a wonderful warm feeling, you can feel the weather through the painting.