What is the southernmost capital city of a sovereign country?

Wellington is the southernmost capital city of a sovereign country, serving as the capital of New Zealand at about 41°17′ south.

The city sits at the southwestern tip of New Zealand’s North Island, beside Cook Strait and Wellington Harbour. Its latitude places it farther south than other national capitals, including Montevideo, Buenos Aires and Canberra. Wellington became New Zealand’s capital in 1865, replacing Auckland as the government’s seat.

Wellington’s position is tied to New Zealand’s geography: it lies near the centre of the two-island country and close to the route between the North and South Islands. Parliament, the executive government and the Supreme Court are based there, although the capital’s status is established by constitutional convention rather than a single formal statutory declaration.

A frequent qualification concerns dependent territories. Port Stanley in the Falkland Islands lies farther south, but the Falkland Islands are a British Overseas Territory rather than a sovereign country. With the question restricted to sovereign states, Wellington is the canonical answer.