The Lions have beaten the Barbarians, the Force, the Reds, Combined Country and the Waratahs so far in 2013 but tonight's game is all set to be their biggest test so far.
And that challenge will take place in vastly different conditions to their opening fixture against the Baa-Baas, with the Australian Bureau of Meteorology predicting temperatures of as low as -1 degrees centigrade at Canberra Stadium.
That temperature will be a far cry from the 30 plus degrees they experienced in Hong Kong on June 1, conditions in which humidity levels reached more than 60 per cent.
Heavy showers are also a possibility in the capital despite the tourists having trained in bright sunshine in Sydney yesterday morning.
The only other time the rains have fallen during the five fixtures to date was in the second-half of the hard-fought victory over the Reds in Brisbane a week-and-a-half ago.
The Australian Rugby Union are suggesting that everyone attending tonight's game wear warm clothing, with hats, gloves and scarves all advised.