Native speaker of American English here. You could say "the amount of precipitation", although "rainfall" would be more common. Since the temperature was recorded in the past, you should say that the highest/lowest temperature "was recorded", rather than "is recorded". We also typically say "recorded to be X degrees" or "recorded at X degrees". Centigrade is also known as Celsius, and the former name is more commonly used in the UK while Celsius is the only term used in the USA. Still, educated Americans understand what centigrade means. I believe that Celsius is more formal than centigrade in the UK, but I would defer to a British English speaker. You should also say "30 degrees centigrade/Celsius", rather than just "30 centigrade/Celsius". I wouldn't say "however" in your second sentence. "However" implies contradiction, and it's perfectly normal for the high and low temperatures to be recorded in different months. Instead, I would say "...30 degrees centigrade, while the lowest temperature...". Similarly, "on the other hand" implies contradiction. I would leave out "On the other hand". Once again, the rain fell in the past, so you should not use the present tense "falls". I wouldn't use that verb at all, however. It would be more natural to say "The peak monthly precipitation was in February at 200mm, and the minimum was in August at 25mm. Saying that July and February had the highest precipitation and temperature implies that both months were hot and rainy. To say that July had the highest temperature, while February had the highest rainfall, use the word "respectively". I.e. "Overall, July and February had the highest temperature and rainfall, respectively, while December and August had the lowest, respectively." If you're unsure what "respectively" or any other word I used means, feel free to ask! Good luck in your English studies.