Why have there been more rainy days in recent years?

The increase in rainy days in recent years may be related to the following factors:

1. Climate change: Global climate change is an important factor. Climate change has led to changes in atmospheric circulation systems that may increase the frequency and intensity of rainfall. Particularly in some areas, global warming may be causing more water vapor to evaporate and increasing atmospheric humidity, which in turn increases the likelihood of rainfall.

2. Natural climate change cycles: There are many cyclical changes in the earth's climate system, such as the El Niño-Southern Oscillation (ENSO). These natural changes can cause more rainfall at certain times or in certain areas.

3. Urbanization and land use changes: Urbanization and land use changes may affect the surface energy balance and water cycle. Large amounts of cement and building structures can increase the heat island effect in urban areas, causing local temperatures to rise. At the same time, urbanization will also destroy natural ecosystems, affect vegetation coverage and land water retention capacity, and then affect surface runoff and rainfall distribution.

4. Cyclic changes in meteorological systems: In addition to global climate change, some atmospheric circulation patterns and weather systems also experience cyclic changes, such as sea temperatures and ocean eddies in the Pacific and Atlantic. These changes may lead to more rainy weather in a given year or period of time. It should be noted that the relative contribution of the above factors may vary by geography and specific circumstances. If you need a more detailed and specific explanation, it is recommended to consult a meteorological expert or local meteorological agency to understand the specific reasons for the change in local rainy weather.