Dear Mr Suleiman
As regards the weather, we are in a temperate zone, (34° latitude South) and therefore we have no bad season to visit. However, for perventing too warm weather, do not come here from December to February, as we could have warm weather, (Mostly 30°C average), but you could visit the seashore and there are nice beaches to see. (Better those from Uruguay, which is about 40 miles from our coast).
All the other seasons are very temperate, inlcluding winter. Temperatures never goes beyond 9°C abd most of the days are sunny and clear.
Our city is windswept, therefore there is always clean air.
In winter the sun appears at 8:00 AM and goes down at 5:30 PM, so the day could be long, not as in the Northern parts of Europe.
Perhaps if you wife is allergic, do not come in September or October as we have many trees that provokes some allergy in particular people tat are sensitive of this.
Buenos Aires have a uge cultural life, Museums and Theaters are quite good and inexpensive compared with those of Europe.
Do not expect a typical Latin American city. We have received a lot of influences from western Europe, (therefore the architecture is quite similar to France, England, Spain or Italy.}
Also we have received many Ukrainan inmigrants which arrived before the Russian Revolution of 1917.
Our countryside is almost the same of Ukrania: Great and fertile plain lands, dedicated to agriculture and cattle. But also you have mountains inside the country, some small and others very tall as the Andean Mountains.
People speaks Spanish but cultured people could manage English and French with acceptable fluency. Of course, no people will understand the language of Taras Schevchenko, your national poet.
I will be glad if you contact me when you decide to come here. I will be pleased to meet you.
The very best regards
Carlos