Climate Report over Japan
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Monthly Highlights
-Monthly 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 northern Japan, because the regions were well affected by the winter monsoon. And monthly sunshine durations were also significantly below normal on the Sea of Japan side of eastern Japan and below normal on the Sea of Japan side of northern Japan and in Okinawa/Amami.
-Monthly snowfall amounts were above normal on the Sea of Japan side of northern Japan, because the region was affected by the strong winter monsoon in the middle and late of the month.
-Monthly precipitation amounts were significantly below normal on the Pacific side of northern/eastern/western Japan and on the Sea of Japan side of western Japan and below normal in Okinawa/Amami, because the regions were less affected by low-pressure systems. Monthly precipitation amounts were the lowest on the Pacific side of western Japan and tied with 1973 as the lowest on the Pacific side of eastern Japan on record for December since 1946. And monthly sunshine durations were also significantly above normal on the Pacific side of northern/eastern Japan and above normal the Sea of Japan side of western Japan and on the Pacific side of western Japan. Monthly sunshine durations were the highest on the Pacific side of northern Japan on record for December since 1946.
-Monthly mean temperatures were below normal in northern Japan, because the region was affected by cold-air inflow.
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.