Climate Change Chart of Sofia, Bulgaria

Overview of climate changes

Temperature changes

Averaged across calendar months, monthly mean temperature shows a difference of +1.88 °C compared with the earlier reference period; this is an unweighted average of the monthly means, not a day-weighted annual figure or a measure of daytime highs. The largest monthly increase was in January, with a difference of +5.38 °C. This identifies the strongest monthly increase in the supplied comparison, rather than implying that every month changed by the same amount.

Changes in snowfall

Averaged across calendar months, mean daily snowfall had a difference of -0.57 mm/day in the more recent period. This unweighted mean describes daily amounts across monthly averages; it is not a snowfall total. The largest monthly decrease in mean daily snowfall was in December, with a difference of -4.45 mm/day. The largest monthly increase occurred in March, at a difference of +0.44 mm/day, so the monthly comparison includes movement in both directions.

Changes in sunshine duration

Averaged across calendar months, mean daily sunshine duration had a difference of -0.16 hours/day compared with the earlier reference period. This is an unweighted summary of monthly mean daily hours, not a day-weighted annual total. The largest monthly decrease was in March, with a difference of -1.06 hours/day. In November, the largest monthly increase was a difference of +0.35 hours/day, highlighting contrasting monthly changes rather than a uniform shift.

Changes in rainfall

Averaged across calendar months, mean daily rainfall had a difference of +0.38 mm/day in the more recent period. This unweighted average of monthly means describes daily amounts, not monthly rainfall totals. The largest monthly increase in mean daily rainfall occurred in March, with a difference of +0.94 mm/day. By contrast, July recorded the largest monthly decrease, a difference of -0.24 mm/day; these monthly extrema show that the changes were not uniform across the calendar.