Climate Change Chart of Nantes, France

Overview of climate changes

Temperature changes

Averaged across calendar months, monthly mean temperature shows a difference of +1.19 °C in the more recent period. 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 December, with a difference of +2.94 °C; that monthly result sits within, rather than replacing, the across-month average.

Changes in rainfall

Mean daily rainfall, rather than monthly rainfall totals, was higher on average across calendar months, with a difference of +0.60 mm/day. This unweighted comparison summarizes the monthly means and does not imply that rainfall increased in every month. The largest monthly increase occurred in October, a difference of +1.47 mm/day, while April had a small decrease, with a difference of -0.04 mm/day.

Changes in sunshine duration

Mean daily sunshine duration averaged across calendar months was lower in the more recent period, with a difference of -0.28 hours/day. This is an unweighted mean of monthly averages, so it does not describe a uniform change across all months. The largest monthly decrease was in January, with a difference of -1.23 hours/day; by contrast, February recorded the largest increase, a difference of +0.32 hours/day.

Changes in snowfall

Mean daily snowfall averaged across calendar months shows a difference of -0.10 mm/day. This unweighted monthly comparison is not a monthly total, and a rounded mean difference should not be taken to mean snowfall was absent. The largest monthly decrease occurred in January, with a difference of -0.55 mm/day. In April / October, the largest increase was a difference of +0.02 mm/day.