There should be also some kind of compensation calculated for rolling resistance. In EU R117 tire test there is a correction formula which correlateds to outside temperature. Rolling resistance part begins at annex 6
https://eur-lex.europa.eu/legal-cont...23(03)&from=EN
10 celsius diffenrence in temperature equals 8% change in rolling resistance on passenger tires. This has even bigger impact than the reduced drag has and basicly doubles the impact of temperature change.