Climate Report over Japan
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Monthly Highlights
- Monthly mean temperatures were significantly above normal nationwide with the highest April record since 1946 in northern/eastern Japan and Okinawa/Amami, because the regions were covered by warm-air and were affected by warm-air inflow. The monthly anomaly of the average temperature over Japan was +2.76°C (the warmest for April since 1898).
- Monthly precipitation amounts were significantly above normal in Okinawa/Amami and were above normal on the Pacific side of eastern/western Japan and on the Sea of Japan side of western Japan. Monthly sunshine durations were significantly below normal on the Sea of Japan side and the Pacific side of western Japan. They were below normal on the Pacific side of eastern Japan. These regions were well affected by low-pressure systems and fronts.
- Monthly precipitation amounts were below normal on the Sea of Japan side of northern Japan. Monthly sunshine durations were significantly above normal on the Sea of Japan side of northern Japan and were above normal on the Pacific side of northern Japan and the Sea of Japan side of eastern Japan. These regions were less affected by low-pressure systems and were frequently covered by high-pressure systems.
Climate Anomaly Table Over Japan
Monthly Climate Anomaly over Japan
Time Series of Temperature Anomaly
Time Series of 10days Precipitation Amount Ratio and Sunshine Duration Ratio
10-day Mean Sea Level Pressure
10-day Mean 850hPa Temperature
10-day Mean 500hPa GeoPotential Height
10-day Mean Outgoing Longwave Radiation
Note: Figures of outgoing longwave radiation (OLR) in Monthly Report over Japan are based on the NOAA CPC Blended OLR data from the September 2023 report, while they were based on the NOAA CPC AVHRR OLR data until the August 2023 report.