premise: the temperature is below freezing sent2: precipitation is when water falls from the sky sent3: the freezing point of water is 32f / 0c / 273k sent4: freezing is usually used to refer the freezing point of water in real life sent5: snow is a kind of ice sent6: water is in the solid state , called ice , for temperatures between 0 / -459 / -273 and 273 / 32 / 0 k / f / c sent7: snow is a kind of precipitation.
hypothesis: a narrow tree-growth ring indicates a dry year