Why are citruses hibernal fruits?

 Dear brothers, there is  perfect wisdom in the fruits created by Allah, and only scientists could realize this wisdom as they explored their secrets. The question to be is: Why citrus fruits come in winter only?
 The benefits of the citrus fruits, why they ripen in winter and how, were mentioned in a very accurate scientific research.
 Some scientists said: In orange you find nutritional compounds and protective vitamins, among which is vitamin C known as a resistant element against weakened structure, skin bleeding, deconstruction of calcic substance in bones, dyspepsia, lack of appetite, and infections.
 One orange a day is enough to support man with all his needs of this vitamin. Moreover, giving orange juice to an infant, who is fed with formula milk, will make up for the lack of this vitamin.
 Dear believing brothers, this vitamin resists a lot of toxic materials, so lemon has unbelievable features in the first place. If you put 10 grams of it in one liter of water, the result would be a solution that is able to kill all kinds of bacteria. Thus, if we want to sterilize drinking water in any area where water can be polluted, all we have to do is to put a few drops of citric juice in it. This amount is enough to kill many kinds of germs and viruses such as cholera and typhoid. So a few drops of citrus juice will kill the germs immediately.

 This fruit, created by Allah All-Mighty, resists rheumatism and stomach diseases. In addition, it strengthens the heart and exterminates all toxic materials swallowed accidentally through food. This fruit (citrus) is created to be a cure before being a nutrient, it is a medicine in the full sense of the word.
 Dear brothers, These are Allah’s Signs in His creations, this what we think of as merely fruit is a drug store by itself; it protects, strengths, and energizes, and if man reflected upon his food, his heart would become submissive, break into tears, and prostrate himself to Allah.