Climate Change Chart of Annecy, France

Overview of climate changes

Changes in snowfall

Averaged across calendar months, mean daily snowfall had a difference of -1.23 mm/day compared with the earlier reference period. This unweighted mean of monthly means describes daily amounts, not monthly snowfall totals. The largest monthly decrease in mean daily snowfall was in January, with a difference of -4.68 mm/day. In March, the largest monthly increase was a difference of +1.40 mm/day; these month-level contrasts show that the overall mean does not characterize every month.

Temperature changes

Averaged across calendar months, the monthly mean temperature difference was +1.43 °C compared with the earlier reference period; this unweighted comparison of monthly means is not a day-weighted annual average, and it does not describe daytime maximum temperatures. The largest monthly mean temperature increase was in January, with a difference of +4.16 °C. By contrast, May had the largest decrease, a difference of -0.41 °C; these month-specific differences do not imply that every month followed the same pattern.

Changes in sunshine duration

Mean daily sunshine duration, averaged across calendar months, showed a difference of -0.34 hours/day compared with the earlier reference period. This is an unweighted mean of monthly means, not a day-weighted annual figure. The largest monthly decrease in mean daily sunshine occurred in December, with a difference of -0.64 hours/day. The largest increase was in September, at a difference of +0.02 hours/day; the two monthly contrasts do not mean that daily sunshine changed in the same way throughout the year.

Changes in rainfall

Averaged across calendar months, mean daily rainfall had a difference of +0.50 mm/day compared with the earlier reference period. This is an unweighted comparison of monthly means, not an annual total or a day-weighted average. The strongest monthly increase in mean daily rainfall was in December, at a difference of +1.65 mm/day; the largest decrease was in August, at a difference of -0.46 mm/day. These figures describe daily means for the named months rather than monthly rainfall totals.