https://youtu.be/QORPe_g0FOA
So 1 celsius change in outside temperature on my test route effects the engergy consumption of the car 0,6% on average. Due notice that at some points even your outside temps stay stabil the tarmac temperatures can still increase which effects (usually linear, but may depend on your tire) your cars tires rolling resistance
How I know the temperature is affecting the results?
On previous tests on summer conditions when temperature stayed constant the results stayed constant.