To analyze the impact of high temperatures in Heilongjiang Province in 2025 on agriculture, based on the daily temperature data of 6-8 months at the ground meteorological observation stations in Heilongjiang Province from 1981 to 2025, the critical threshold of daily maximum temperature ≥ 35℃ was introduced to identify high temperatures. Using methods such as Pearson correlation analysis, the frequency, concentrated periods, number of days, and spatial distribution characteristics and evolution laws of high temperatures were analyzed. The study revealed the influence of high temperatures on the growth and development of spring corn. The results showed: (1) The extreme high-temperature weather processes in the study area in the summer of 2025 were divided into three periods, and the number of high-temperature days was 4 days more than the normal years. (2) The spatial variation of the daily average maximum temperature in the summer of 2025 characterized a distribution pattern of lower in the north and higher in the south. The number of high-temperature days showed a trend of gradually increasing from the central region to the north and south; only in July there was a near-abnormal warm temperature, and the stations were mainly distributed in the southeast of Heilongjiang Province, overlapping with the area where the spring corn growth period was shortened. (3) The number of growth periods showed a trend of decreasing with the increase in the highest temperature, which to some extent indicated that the high-temperature conditions had a promoting effect on the growth of spring corn; the overall meteorological conditions in 2025 were better, which was conducive to the growth and development of spring corn.