Climate Change Chart of Florence, Italy

Overview of climate changes

Temperature changes

Averaged across calendar months, monthly mean temperature shows a difference of +1.33 °C compared with the earlier reference period; this is an unweighted mean of the monthly means, not a day-weighted annual average or a measure of daytime highs. The largest monthly increase was in January, with a difference of +3.29 °C. By contrast, September had the largest monthly decrease, at -0.25 °C; these month-specific differences do not imply that every month followed the overall mean.

Changes in rainfall

Mean daily rainfall, averaged across calendar months, had a difference of +0.83 mm/day in the more recent period. This unweighted comparison of monthly means describes daily amounts, not monthly rainfall totals, and does not mean that rainfall increased in every month. September recorded the largest monthly increase in mean daily rainfall, with a difference of +1.93 mm/day. It identifies the strongest month-specific increase among the supplied facts, rather than a pattern that can be assumed for other months.

Changes in sunshine duration

Averaged across calendar months, mean daily sunshine duration had a difference of -0.23 hours/day compared with the earlier reference period. This is an unweighted mean of monthly daily-hour averages, not a statement that sunshine declined in each month. The largest monthly decrease was in September, where mean daily sunshine duration had a difference of -0.36 hours/day. This marks the strongest decrease in the supplied monthly comparison, not a continuous change between the reference periods.

Changes in snowfall

Mean daily snowfall, averaged across calendar months, had a difference of -0.35 mm/day in the more recent period. This unweighted mean describes daily amounts rather than monthly totals; it does not establish that snowfall decreased in every month. January had the largest monthly decrease in mean daily snowfall, with a difference of -2.30 mm/day. In April, the largest monthly increase was a difference of +0.01 mm/day; the differing directions show why the overall mean should not be read as applying uniformly across months.