Climate Change Chart of Okinawa, Japan

Overview of climate changes

Temperature changes

Averaged across calendar months, monthly mean temperature shows a difference of +0.60 °C compared with the earlier reference period. This is a mean across the monthly averages, not a day-weighted annual figure, and it does not mean that every month was warmer. The largest monthly increase was in June, at +1.31 °C; by contrast, December had the largest decrease, a difference of -0.06 °C. These month-specific changes describe averages rather than daytime maximum temperatures.

Changes in rainfall

Mean daily rainfall, rather than monthly totals, had an average difference across calendar months of +2.07 mm/day compared with the earlier period. That aggregate does not imply an increase in every month. The largest monthly increase occurred in June, with a difference of +5.68 mm/day, while November recorded the largest decrease, a difference of -0.20 mm/day. These values summarize daily amounts within each month's average; they are not accumulated rainfall totals for the month.

Changes in sunshine duration

Mean daily sunshine duration averaged across calendar months had a difference of -0.40 hours/day relative to the earlier reference period. This broad average does not describe every month's direction. The clearest monthly gain was in February, with a difference of +0.39 hours/day, whereas the largest monthly decrease was in December, at -0.88 hours/day. These comparisons concern average daily hours within the specified months, not total sunshine accumulated over a month.