In the background of global warming, many observations have indicated an increasing trend of extreme precipitation. In this paper, we use global temperature and precipitation data from 1979 to 2021 to analyse the trends of temperature, information entropy and extreme precipitation in the global, northern and southern hemisphere, and discuss the correlation between information entropy and extreme precipitation. The results show that there is a significant warming trend in the global, northern and southern hemisphere. There is a decreasing trend in information entropy in global, northern and southern hemispheres. The most significant decreasing trend is −2.5 × 10–3/yr in the Northern Hemisphere. Extreme precipitation shows an increasing trend, with the northern hemisphere showing the most significant increase at 0.73 mm/yr. There is a significant negative correlation between information entropy and interannual changes in extreme precipitation in the global, northern and southern hemispheres. The correlation in the northern hemisphere is the most significant with −0.63, indicating that the decrease in information entropy could indicate the increase in extreme precipitation.