Climate Change Chart of Geneva, Switzerland

Overview of climate changes

Changes in snowfall

Mean daily snowfall averaged across calendar months had a difference of -1.61 mm/day in the more recent period. This is an unweighted comparison of monthly daily means, not monthly snowfall totals, and it does not imply the same change in each month. The largest decrease occurred in January, a difference of -5.67 mm/day, while March had the largest increase, a difference of +1.14 mm/day. The contrast between these month-specific differences and the overall mean summarizes variation between the reference periods without indicating a continuous trend.

Temperature changes

Averaged across calendar months, monthly mean temperature shows a difference of +1.52 °C compared with the earlier reference period; this unweighted comparison describes the average of the monthly means, not a day-weighted annual temperature or daytime highs. The month-level differences are not uniform: January had the largest increase, a difference of +4.16 °C, while May had the largest decrease, a difference of -0.44 °C. These extrema identify the largest monthly changes, not a continuous pattern between the periods.

Changes in rainfall

Across calendar months, mean daily rainfall averaged a difference of +0.35 mm/day in the more recent period. This is an unweighted mean of monthly daily averages, not a monthly rainfall total or a day-weighted annual average. The largest monthly increase was in December, with a difference of +1.72 mm/day; the largest decrease was in August, with a difference of -1.13 mm/day. These month-specific changes show why the overall mean should not be read as applying to every month.

Changes in sunshine duration

Mean daily sunshine duration averaged across calendar months had a difference of -0.21 hours/day compared with the earlier reference period. This unweighted summary of monthly daily means is not a day-weighted annual measure. Month-level differences varied: December recorded the largest decrease, a difference of -0.58 hours/day, whereas February had the largest increase, a difference of +0.07 hours/day. The small increase in that month does not offset the fact that the mean across calendar months was lower; neither result describes every month.