Climate Report over Japan

Monthly Highlights

- Monthly precipitation amounts were significantly above normal on the sea of Japan side of northern Japan, which was repeatedly affected by low pressure systems and fronts, and on the Pacific side of eastern Japan, which was affected by troughs and moist air on some days.
- Monthly sunshine durations were significantly above normal on the Pacific side of western Japan and above normal on the Pacific side of northern Japan, the sea of Japan side of western Japan, and in Okinawa/Amami, and monthly precipitation amounts were below normal in western Japan and Okinawa/Amami because these regions were frequently covered with high pressure systems.
- Strong cold air inflow in late December resulted in heavy snowfall on the sea of Japan side of northern, eastern, and western Japan, and temperature fluctuations were significant over Japan.

Climate Anomaly Table Over Japan

• 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.