Climate Change Chart of Flatey, Iceland

Overview of climate changes

Temperature changes

Averaged across calendar months, monthly mean temperature shows a difference of +1.90 °C in the more recent period; this is an unweighted average of the monthly means, not a day-weighted annual average or a measure of daytime maximum temperatures. The largest monthly increase was in February, with a difference of +4.24 °C. By contrast, July had the largest decrease, a difference of -0.75 °C.

Changes in snowfall

Mean daily snowfall, averaged across calendar months, had a difference of +1.05 mm/day in the more recent period. This unweighted monthly-mean comparison concerns daily amounts, not monthly snowfall totals, and does not imply the same change in every month. The largest monthly increase was in December, with a difference of +8.66 mm/day; the largest decrease was in April, with a difference of -6.94 mm/day.

Changes in sunshine duration

Averaged across calendar months, mean daily sunshine duration had a difference of -0.60 hours/day in the more recent period. This is an unweighted average of monthly mean daily hours, rather than a day-weighted annual figure. The monthly pattern was not uniform: April recorded the largest increase, a difference of +0.33 hours/day, while July recorded the largest decrease, a difference of -1.88 hours/day.

Changes in rainfall

Mean daily rainfall, averaged across calendar months, had a difference of +0.66 mm/day in the more recent period. This unweighted comparison of monthly means describes daily amounts averaged by month, not monthly rainfall totals or a day-weighted annual average. The largest monthly increase occurred in October, where mean daily rainfall had a difference of +1.82 mm/day; that monthly result need not describe rainfall in every individual month.