The ambient temps were about 7-8C during the dyno runs. But I do believe that a few degrees diff in ambient temps does not really make a huge impact compared to not having a proper fan blowing on your IC.
Meanwhile, did some more 30-70 testing and achieved 6.2s avg with best runs about 6.15s (
http://www.mini2.com/forum/3270496-post294.html). Btw also checked that the max mph achieved on 3rd was 86mph just after the rev limited was reached at 6850rpms.
Ps. Warsaw is now -2 - -5C - very good for power, not so good for traction
