Climate Change Chart of Frankfurt, Germany

Overview of climate changes

Temperature changes

Across calendar months, the unweighted mean of monthly mean temperatures shows a difference of +1.60 °C compared with the earlier reference period; this describes an average across the months, not a day-weighted annual figure or a change in daytime highs. The largest monthly increase was in January, where the difference was +4.40 °C. That identifies the strongest increase among the supplied monthly facts, rather than indicating that every month warmed by the same amount.

Changes in rainfall

Averaged across calendar months, mean daily rainfall had a difference of +0.42 mm/day compared with the earlier reference period. This unweighted mean of monthly means is not a day-weighted annual average, and the figures describe daily amounts rather than monthly totals. The largest monthly increase occurred in October, with a difference of +0.78 mm/day. By contrast, November had the largest monthly decrease, with a difference of -0.12 mm/day. These month-specific differences show that the shifts varied by calendar month; they do not imply that rainfall changed by the same amount on every day.

Changes in sunshine duration

Mean daily sunshine duration, averaged across calendar months, had a difference of -0.19 hours/day; this is an unweighted average of monthly means, not a day-weighted annual figure. The largest monthly increase was in April, with a difference of +0.72 hours/day, while the largest decrease was in January, with a difference of -1.02 hours/day. The opposing monthly extremes put the overall mean in context: it summarises differences across calendar months and does not describe the change on every day.

Changes in snowfall

Across calendar months, the unweighted mean of mean daily snowfall had a difference of -0.30 mm/day compared with the earlier reference period. This is an average of monthly means, not a day-weighted annual figure or a monthly snowfall total. The largest monthly decrease was in February, with a difference of -1.42 mm/day; the largest increase was in April, with a difference of +0.27 mm/day. These contrasting monthly changes indicate that the period-average difference does not apply uniformly across months. They describe recorded mean daily amounts, not whether snowfall occurred on any particular day.