The percentage of rain in a weather forecast, often called the Probability of Precipitation (PoP), represents the statistical likelihood that at least 0.01 inches of rain will fall at any given point in the forecast area during the specified time period. For example, a 30% chance of rain means there is a 30% probability that measurable rain will occur at a particular location within the forecast area during that time frame

. This percentage does not mean that it will rain for 30% of the time, nor that 30% of the area will definitely receive rain. Instead, it reflects the forecaster's confidence combined with the expected coverage of precipitation. For instance, a 40% chance could mean the forecaster is 80% sure it will rain but expects it to cover only 50% of the area, or that rain is expected to cover the whole area but the forecaster is only 40% confident it will happen

. In simpler terms, if weather conditions similar to today's were repeated many times, rain would occur in about 30% (or whatever the forecast percentage is) of those instances at that location

. So, a higher percentage indicates a greater likelihood of rain, helping people decide how to plan outdoor activities accordingly

. Summary:

• Percentage of rain = chance of measurable rain (≥0.01 inch) at a given point in the forecast area and time.
• Does not mean rain duration or area coverage directly.
• Calculated as forecaster confidence × expected area coverage.
• Reflects statistical likelihood based on similar past weather conditions