That is why these yoyo weather extremes hot one day, cold the next... are so hard/bad on our commercial food supply, organic or not, as well.
grz-
It is those stresses that cause the plants to produce more sugars and beneficial phytochemicals. If you want to make a sweeter watermelon you stress it by withholding water until it starts to wilt so it concentrates its sugar. If you want hotter peppers you use the same trick so the plants concentrate their oils in the fruits. This is also the reason I prefer wildcrafted herbs over cultivated herbs. The stresses of nature make for more medicinal plants, as well as healthier plants.