What is the percentage of rainy weather on iphone?

The weather percentage on iphone refers not to the local precipitation, but to the probability of rain in a certain area. In the predicted time and area, there may be the possibility of precipitation. In other words, there is such a great probability that it will rain in the selected time period and area.

If it rains or snows, the percentage number next to the raindrop or snowflake icon represents the probability of rain or snow. If it is sunny or cloudy, there is no such percentage. This probabilistic weather forecast has been used since 1966 in the United States, 1980 in Japan and 1995 in China.

Present situation of probability prediction

Probabilistic weather forecast is to express the possibility of forecasting quantity with probability value. What it provides is not the "yes" or "no" of a weather phenomenon or the "big" or "small" of a meteorological element value, but the possibility of weather phenomena.

Generally, it is sunny, and it is impossible to rain with a probability of 0%. Sunny to cloudy, precipitation probability 10%-20%, precipitation possibility is very small. Cloudy, sporadic or local precipitation, when the probability is between 30% and 50%, there is a chance of precipitation.