Climate Change Chart of Ischia, Italy

Overview of climate changes

Temperature changes

Monthly mean temperature shows a mean difference of +2.07 °C averaged across calendar months; this is an unweighted comparison of monthly means, not a day-weighted annual average or a measure of daytime maximum temperatures. The largest monthly increase was in January, with a difference of +3.48 °C compared with the earlier reference period. That identifies the strongest increase among the supplied monthly differences, rather than describing every month's change.

Changes in rainfall

Mean daily rainfall averaged across calendar months had a difference of -0.19 mm/day. This is an unweighted mean of monthly comparisons, not a day-weighted annual average, and it does not imply the same change in every month. The largest monthly increase was in March, at +1.37 mm/day; the largest monthly decrease was in October, at -1.86 mm/day. These are differences in mean daily rainfall, not monthly rainfall totals, and show how changes varied between the two months.

Changes in sunshine duration

Mean daily sunshine duration had a mean difference of -0.05 hours/day averaged across calendar months. The figure is an unweighted comparison of monthly means, not a day-weighted annual average, and does not mean that sunshine declined in every month. Monthly differences were mixed: the largest increase was in December, at +0.48 hours/day, while the largest decrease was in March, at -0.61 hours/day. These describe changes in mean daily hours for those months, rather than total sunshine over a month.

Changes in snowfall

Mean daily snowfall averaged across calendar months had a difference of -0.13 mm/day. This is an unweighted mean of monthly comparisons, not a day-weighted annual average; the rounded difference describes the displayed precision and does not establish that snowfall was absent. The largest monthly decrease was in January, with a difference of -1.16 mm/day. This refers to mean daily snowfall in that month, not a monthly snowfall total.