Climate Report over Japan

Seasonal Highlights

-Seasonal mean temperatures were significantly above normal nationwide, because warm air covered nationwide. Seasonal mean temperatures were the highest in eastern/western Japan and Okinawa/Amami on record for autumn since 1946. The seasonal anomaly of the average temperature over Japan was +1.97 ℃ , the warmest for the season since 1898, exceeding the previous record for autumn 2023.
-Seasonal precipitation amounts were significantly above normal on the Sea of Japan side of eastern Japan, and above normal on the Sea of Japan side of western Japan due to the low-pressure systems and fronts. In Okinawa/Amami, seasonal precipitation amounts were significantly above normal and seasonal sunshine durations were below normal, because the regions were well affected by typhoons and moist air inflow.
-On the other hand, high-pressure systems frequently covered from northern to western Japan. Seasonal precipitation amounts were significantly below normal on the Pacific side of northern Japan, and below normal on the Pacific side of eastern Japan. Monthly sunshine durations were significantly above normal on the Sea of Japan side of northern Japan and on the Pacific side of northern Japan, and above normal on the Sea of Japan side of eastern/western Japan.

Climate Anomaly Table Over Japan

• Climate Anomaly Table Over Japan

Seasonal Climate Anomaly over Japan

Monthly Mean 500hPa GeoPotential Height