Climate Change Chart of Yerevan, Armenia

Overview of climate changes

Temperature changes

Averaged across calendar months, monthly mean temperature shows a difference of +2.47 °C in the more recent period; this is an unweighted mean of monthly means, not a day-weighted annual average or a measure of daytime highs. The largest monthly increase was in March, with a difference of +4.61 °C. This identifies the strongest increase among the monthly mean-temperature differences, rather than describing every month or a continuous change between the reference periods.

Changes in rainfall

Mean daily rainfall averaged across calendar months shows a difference of -0.11 mm/day compared with the earlier reference period. This unweighted mean summarizes monthly mean differences; it is not a day-weighted annual average or a monthly rainfall total. The largest monthly decrease was in June, with a difference of -0.86 mm/day, while the largest increase was in March, with a difference of +0.26 mm/day. These two monthly contrasts show that the direction and size of the differences varied by calendar month, not that rainfall followed a continuous course between the periods.

Changes in snowfall

Mean daily snowfall averaged across calendar months shows a difference of -0.89 mm/day compared with the earlier reference period. This unweighted average of monthly means describes the aggregate difference, not a day-weighted annual amount or monthly total. The largest monthly decrease occurred in January, with a difference of -3.95 mm/day. These figures describe recorded snowfall differences; they do not imply that snowfall was absent in other months or that the change was continuous between the reference periods.

Changes in sunshine duration

Mean daily sunshine duration, averaged across calendar months, had a difference of -0.28 hours/day in the more recent period. This is an unweighted mean across calendar-month means, rather than a day-weighted annual figure. Monthly differences were not uniform: the largest decrease occurred in March, with a difference of -0.84 hours/day, while the largest increase was in January, with a difference of +0.18 hours/day. These extrema describe monthly mean daily sunshine, not the conditions of every day or a continuous trend between the reference periods.