What does the percentage in the weather forecast mean?

1. If it is raining or snowing, the percentage number next to the raindrop or snowflake icon represents the probability of raining or snowing.

If the weather is sunny or cloudy, there is no such percentage.

Probabilistic weather forecast, such as the forecast of precipitation, the traditional weather forecast generally predicts rain or no rain, while the probability forecast gives the percentage of possible precipitation. The greater the percentage, the greater the possibility of precipitation.

Probabilistic weather forecast not only reflects the certainty of weather change, but also reflects the uncertainty and uncertainty degree of weather change. In many cases, this forecasting form can better meet the decision-making needs in economic activities and military activities.

Rainfall probability

1, the general situation of precipitation probability forecast is sunny, and the probability of 0% is impossible to precipitation; Sunny to cloudy, the probability of precipitation is between 10%-20%, and the possibility of precipitation is very small;

2, cloudy, with sporadic precipitation or local precipitation, when the probability is between 30% and 50%, there is a chance of precipitation;

3. The probability of precipitation is between 60% and 70%.

Extended data

Forecasters predict the percentage of precipitation opportunities in a certain area and a certain period of time through sorting, analysis, judgment and discussion based on various meteorological data. This is only the "probability" of forecasting precipitation, and it cannot guarantee 100%.

In the next 36 hours (every 12 hours 1 period), there will be precipitation opportunities above 0. 1 cm in three periods, regardless of precipitation time and region.

When arranging activities, it will not rain, and make proper preparations for rain; The probability of forecasting precipitation is 60%, and the activities are mainly rainy, supplemented by no rain; The probability of forecasting precipitation is 80%, so be prepared for rain.