Climate Report over Japan
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Monthly Highlights
-Monthly mean temperatures were significantly above normal nationwide, because warm air covered Japan. Monthly mean temperatures were the highest in eastern/western Japan and tied with 2017 as the highest in Okinawa/Amami on record for September since 1946.
-High-pressure systems frequently covered from northern to western Japan. Monthly precipitation amounts were significantly below normal on the Pacific side of northern/western Japan and the Sea of Japan side of western Japan, and below normal on the Sea of Japan side of northern Japan and the Pacific side of eastern Japan. Monthly sunshine durations were significantly above normal on the Sea of Japan side of northern/western Japan and the Pacific side of western Japan, and above normal on the Pacific side of northern/eastern Japan and the Sea of Japan side of eastern Japan. Monthly sunshine durations were the highest on the Sea of Japan side and the Pacific side of western Japan on record for September since 1946.
-On the other hand, monthly precipitation amounts on the Sea of Japan side of eastern Japan were above normal, because the region was affected by fronts. Monthly sunshine durations in Okinawa/Amami were below normal, because the region was well affected by typhoons and tropical cyclones.
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.