An American FIA official has questioned the scheduled date for the inaugural US Grand Prix in Austin.
The World Motor Sport Council announced after its Barcelona meeting last week that the Circuit of the Americas, under construction in the Texan capital, will host its first Formula One race in 2012 in mid June.
For logistical reasons, the event is paired on consecutive weekends with F1's only other North American venue in Canada.
But the local American Statesman newspaper has pointed out that in 2009, for example, the temperature in Austin on 17 June was a sweltering 100 degrees (38C).
"This is the proposed date. The date won't be final until the September or December meeting," American Nick Craw, president of the FIA senate, said.
"A fall (autumn) date is, therefore, possible, which would possibly offer cooler weather," he added.
Craw said the later race date would have to be proposed by US GP promoter Tavo Hellmund as well as Bernie Ecclestone.
The Circuit of the Americas said in a statement that excavation work continues at the site, with construction "on schedule".