Andrea, it has been discussed here in forum, that in Spanish, there are two words for seasons. One is for the four seasons of the year and it is 'estación'. The other word for season is 'temporada' and is used as a period of time, such has the rainy season (La temporada de lluvias), or temporada de fútbol (football season), or temporada de ópera (opera season).
Therefore, 'The third of the season' is referring to an event which happened three times in a season, such as a touchdown by a certain player. There are many other examples where this statement could be used. I hope you get the idea. So we do say this in English.
Read here near the bottom for more examples: http://www.spanishdict.com/translate/temporada
Hope this helps.
It would be really helpful if we could also see a direct translation for these. If this app had that it would help a lot. I like that it shows you the translation that makes sense in english but if i could also see the direct translation it would help me to understand the actual words and how they literally construct a sentence. PLEASE add this i will love this app even more. Also a short explanation before a lesson such as "object pronouns" that explains what you are learning with examples in both languages and an explanation of how they are similar and how theyre different between languages. Just a few paragraphs before each major lesson would help immensely. Thanks for your fantastic work!! This app is amazing!