In 2000 we visited Punta Tombo in Argentina where there is a colony of 1000s of Magellan penguins. I didn't notice that is was any colder than current UK weather.

That was quite a day - collected from hotel in Madryn at 6am, 2 hour drive to Punts Tombo (awesome) most of which was on unpaved roads, then 2 hour drive back to Madryn airport for flight to Rio de Gallegos, 7 hour drive accross Argentina to hotel by Perito Moreno Glacier - again awesome!!