Variations of Temperature, Precipitation, and Extreme Events in Heilongjiang River

Based on the daily data of temperature (T) and precipitation (P) of Heilongjiang River basin, Mann–Kendall test method, the linear least-squares regression model and hydrological statistical analysis methods were selected to analyze the variations of temperature, precipitation, and extreme events in Heilongjiang River. The results revealed that T had significant increasing trends, and annual P increased only in the lower reaches. The annual extreme low temperature (ELT) increased obviously. Both the annual extreme high temperature (EHT) had noticeable increasing trends. The outputs can provide a valuable theoretical basis for sustainable development and utilization of water resources in Heilongjiang River.