Climate Change Chart of Hammerfest , Norway

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 maximum temperatures. The largest monthly increase was in February, with a difference of +3.63 °C. This identifies the strongest increase among the monthly means, rather than implying that every month warmed by the same amount.

Changes in sunshine duration

Averaged across calendar months, mean daily sunshine duration had a difference of -0.54 hours/day compared with the earlier period; this is an unweighted average of monthly means, not a day-weighted annual measure. The largest monthly decrease was in June, with a difference of -1.68 hours/day. By contrast, the largest increases were shared by January / February, each represented together in the supplied monthly comparison by a difference of +0.05 hours/day.

Changes in snowfall

Averaged across calendar months, mean daily snowfall had a difference of -0.93 mm/day in the more recent period. This unweighted comparison summarizes monthly means of daily amounts, not monthly snowfall totals, and does not describe the change in every month. The monthly pattern included the largest increase in March, a difference of +3.02 mm/day, and the largest decrease in October, a difference of -4.15 mm/day. These refer to mean daily snowfall in the named months, rather than monthly totals.

Changes in rainfall

Averaged across calendar months, mean daily rainfall had a difference of +0.10 mm/day in the more recent period. This unweighted summary concerns monthly means of daily amounts, not monthly rainfall totals, and does not mean that every month became wetter. Monthly differences varied: June had the largest increase, a difference of +0.73 mm/day, while January had the largest decrease, a difference of -0.34 mm/day. These are changes in mean daily rainfall for those months, not changes in their monthly totals.