This study focuses on the Changchun area under the influence of the subtropical high and analyzes the relationships between power load and meteorological factors during the high-temperature period in the summer of 2025

including air temperature

relative humidity

wind speed

apparent temperature

and specific humidity. The results show that from July 4 to 12

2025

Changchun experiences a historically extreme high-temperature event under the influence of the subtropical high. The average temperature is 4.1 °C higher than the climatological normal

ranking first among historical anomalies for the same period

. The extreme maximum temperature ranks third for the same period since 1951

and the intensity and duration of the high-temperature event reach the extreme level. Air temperature shows a very strong positive correlation with power load

with

R

= 0.9. Apparent temperature shows a strong positive correlation

with

R

= 0.7. Relative humidity shows a moderate negative correlation

with

R

= −0.5. Wind speed and specific humidity show weak positive correlations

with

R

= 0.3. These results indicate significant differences in the correlations between different meteorological factors and power load. An air temperature of 31 °C and an apparent temperature of 42 °C can be used as high-load monitoring indicators. When the air temperature exceeds 33 °C and the apparent temperature exceeds 46 °C

these conditions can be used as indicators for initiating emergency dispatch. The proposed indicators provide a reference for power load forecasting under similar weather conditions.