The <i>most</i> likely temperature low tonight <i>might</i> be 34ºF. There is a 50% chance that the temperature <i>could</i> fall between 33 and 35ºF. While the range of <i>possible</i> lows <i>could</i> span 31 to 38ºF, those extremes are less likely. It is also more likely to be cooler than warmer within that range.