Climate Change Chart of Bregenz, Austria

Overview of climate changes

Temperature changes

Averaged across calendar months, monthly mean temperature shows a difference of +1.78 °C compared with the earlier reference period; this is an unweighted mean of monthly means, not a day-weighted annual average or a measure of daytime maximum temperatures. The change was not uniform across the selected months: January had the largest monthly increase, a difference of +4.81 °C, while May had the largest monthly decrease, a difference of -0.11 °C. These extrema describe the largest changes in their respective directions, not every month's experience.

Changes in rainfall

Mean daily rainfall averaged across calendar months had a difference of +1.42 mm/day in the more recent period. This is an unweighted average of monthly means, rather than a day-weighted annual average, and describes daily amounts rather than monthly totals. The largest monthly increase occurred in August, with a difference of +2.93 mm/day; that monthly result is distinct from the overall mean difference and does not imply that rainfall increased in every month.

Changes in sunshine duration

Mean daily sunshine duration, averaged across calendar months, had a difference of -0.32 hours/day compared with the earlier period; this is an unweighted mean of monthly means. Monthly changes varied: May recorded the largest decrease, a difference of -0.52 hours/day, while the largest increase was in February, with a difference of +0.04 hours/day. These daily-hour measures describe monthly mean conditions and do not establish that sunshine shifted in the same direction in every month.

Changes in snowfall

Mean daily snowfall averaged across calendar months had a difference of -0.34 mm/day in the more recent period. This unweighted mean of monthly means describes daily amounts, not monthly totals, and does not mean that snowfall was absent where rounded values may appear unchanged. The largest monthly increase was in January, a difference of +1.07 mm/day, whereas February had the largest monthly decrease, a difference of -1.72 mm/day. These month-specific changes show why the overall mean difference should not be read as a uniform change throughout the year.