How do monthly temperatures on a climograph allow you to determine whether an area is in the northern or southern hemisphere?

In theory, if the temperatures are at their lowest in December-January-February, the country will be in the northern hemisphere and if they are at their lowest in June-July-August the country will be in the Southern Hemisphere.

It is natural to expect a country to have their lowest temperatures in their winter months and their highest temperatures in the summer months, and this will normally be the case if the country is a reasonable distance from the equator. However this is not always true if the country is near or on the equator.