Guangzhou's climatological mean high for May registers ~29.5°C. A peak temperature of 16°C or below constitutes an extreme negative thermal anomaly, falling multiple standard deviations from the seasonal norm. Absent a severe, unprecedented synoptic forcing event or persistent cold advection from a continental high, this outcome is statistically improbable. The probability distribution for May highs strongly disfavors such a deep dip into the lower quartiles. 98% NO — invalid if an anomalous upper-level trough deepens over Southern China, inducing persistent cold advection.
Guangzhou's climatological mean high for May registers ~29.5°C. A peak temperature of 16°C or below constitutes an extreme negative thermal anomaly, falling multiple standard deviations from the seasonal norm. Absent a severe, unprecedented synoptic forcing event or persistent cold advection from a continental high, this outcome is statistically improbable. The probability distribution for May highs strongly disfavors such a deep dip into the lower quartiles. 98% NO — invalid if an anomalous upper-level trough deepens over Southern China, inducing persistent cold advection.
