Climate Change Chart of Thessaloniki, Greece

Overview of climate changes

Temperature changes

Averaged across calendar months, monthly mean temperature had a difference of +0.51 °C compared with the earlier reference period; this is an unweighted comparison of monthly means, not a day-weighted annual average or a measure of daytime highs. The largest monthly increase was in January, at +2.01 °C, while October had the largest decrease, at -0.25 °C. These monthly contrasts show that the overall mean difference does not describe every month.

Changes in snowfall

Mean daily snowfall showed an unweighted difference across calendar-month means of -0.61 mm/day in the more recent period; this describes an aggregate of monthly means, not monthly totals or a uniform change through the year. The largest monthly decrease was in January, at -3.65 mm/day, while the largest increase was in April, at +0.12 mm/day. The opposing monthly differences underline why the across-month mean should not be read as a description of snowfall in every month.

Changes in rainfall

Mean daily rainfall, rather than monthly rainfall totals, had an unweighted across-month difference of +0.26 mm/day in the more recent period. The largest monthly increase occurred in March, with a difference of +1.03 mm/day; in December, the largest decrease was -0.74 mm/day. The mean summarizes differences across calendar months, so it does not imply that daily rainfall changed by the same amount in each month.

Changes in sunshine duration

Mean daily sunshine duration was unchanged at the displayed precision when its monthly means are averaged across calendar months: the difference was 0.00 hours/day. That rounded mean does not establish that every month was unchanged. The largest increase was in January, at +0.78 hours/day, whereas June recorded the largest decrease, at -0.36 hours/day. These are monthly mean daily hours, not total sunshine over a month.