what's buenos aires like in july? is it worth going during their winter?

ghahn: Argentina is a huge country and the climate is very varied! Buenos Aires is cold, but not too bad. Better in the Iguazu Falls and the NW of Argentina where it is always sunny. Specially Cafayate ( and the white torrontes wines!), Cachi, Purmamarca and the Salt Flats. Maybe it snows in the mountains, but it is very rare. Anyway you will enjoy it better than PAtagonia.
Argentina is a country which has all kind of climates...
Have a nice time.Just enjoy it!

If you ask a "porteño" about the weather in Buenos Aires in July he will say it is very cold. For the tourists coming from the Northern Hemisphere it is only chilly.

We have had mild winters lately with only 10 days in all really cold. In the city, only a coat and a jumper will do.

During the winter, travelling in the northern areas is recommendable;sunny days and pleasant temperature during the day becoming chilly during the night. That would be for the Northeastern (Iguazu) side and Northwestern side of Argentina (Salta and Jujuy)

(Iguazu is too hot in Summer.
Salta doesnt follow the same pattern. It has a better temperature in Summer than Bs.As does).

The ski season begins around the 20th June and July and August are the most convenient months for the practice of ski at the various winter resorts the country has. The rest of Patagonia is cold and windy.

If you come in July you will love to stay in Buenos Aires and for sure you will enjoy the north.

milla

Milla is right, ghahn, the NW is warm and nice. Why don`t you have a look to some TA`s review. They can help you to decide. I am sure you will fall in love with Salta and Jujuy, specially the Humahuaca Gorge! And the Salt Flats!
Cafayate is my favorite!
Have a nice time.

thanks, everyone! anyone have recommendations for travel agents?

There is a knowledgable local guide and her name is Angie.
Tripadvisor has an excellent report of Salta-Jujuy area written by somebody who used her services.
luck in your search.
milla