Climate Change Chart of Budapest, Hungary

Overview of climate changes

Temperature changes

Averaged across calendar months, monthly mean temperature shows a difference of +1.67 °C compared with the earlier reference period. This unweighted mean summarizes the monthly averages; it is not a day-weighted annual figure or a measure of daytime maximum temperatures. The largest monthly increase was in January, with a difference of +4.74 °C. By contrast, September had the largest monthly decrease, a difference of -0.59 °C. These selected months show that the comparison varies by month rather than describing an identical change throughout the year.

Changes in snowfall

Mean daily snowfall, not monthly snowfall totals, averaged across calendar months, shows a difference of -0.44 mm/day in the more recent reference period. This is an unweighted mean of calendar-month averages; it should not be read as a day-weighted annual average or as evidence that snowfall was absent. The largest monthly decrease occurred in February, with a difference of -2.98 mm/day. Conversely, November had the largest monthly increase, at a difference of +0.10 mm/day. The aggregate decrease and these contrasting monthly differences describe the comparison at different levels, rather than a uniform change in snowfall across all months.

Changes in sunshine duration

Mean daily sunshine duration averaged across calendar months shows a difference of -0.37 hours/day compared with the earlier period; this is an unweighted summary of monthly means, not a day-weighted annual average. The largest monthly decrease was in September, with a difference of -0.99 hours/day. In June, the largest monthly increase was much more limited in direction and scale, at a difference of +0.07 hours/day. The monthly differences therefore vary, and the mean does not describe the change in every individual month.

Changes in rainfall

Mean daily rainfall, rather than monthly totals, averaged across calendar months, shows a difference of +0.56 mm/day in the more recent period. This unweighted mean describes the aggregate of the calendar-month means, not a day-weighted annual average. The largest monthly increase occurred in September, at a difference of +1.54 mm/day, while April recorded the largest monthly decrease, a difference of -0.28 mm/day. These monthly contrasts qualify the overall mean: it does not imply that rainfall increased in every month.