Division 3.3 Atmospheric conditionsF1
United Kingdom
The wind conditions shall not interfere with wetting of the surface (wind-shields are allowed).
Both the wetted surface temperature and the ambient temperature shall be between 2 °C and 20 °C for snow tyres and 5 °C and 35 °C for normal tyres.
The wetted surface temperature shall not vary during the test by more than 10 °C.
The ambient temperature must remain close to the wetted surface temperature; the difference between the ambient and the wetted surface temperatures must be less than 10 °C.