Unexpected cool weather conditions were experienced during free practice for the Mexican Grand Prix on Friday, with the morning session starting in just 14 degrees centigrade ambient and the afternoon warming up to only 16 degrees centigrade.
Track temperatures were also cooler with a peak of just 27 degrees centigrade at the start of FP2, but then it fell slightly during the course of the afternoon session.
These cool conditions caused some degree of graining and put the emphasis on tyre warm-up. As a result, the low working range medium tyre was quickest in the coolest conditions of the morning; however Sebastian Vettel went fastest of all for Ferrari in the afternoon with a time of 1m19.790s on the supersoft, ahead of the two Mercedes.
Weather conditions are not expected to be greatly different for the remainder of the weekend, with the possibility of rain as well (a few drops were seen at the end of FP1).
This made the day’s work especially important: however, there was a very high degree of track evolution that means a full picture of relative performance is yet to emerge – which should be clearer following FP3 tomorrow with more rubber on the track.