Climate Change Chart of Sandnes, Norway

Overview of climate changes

Temperature changes

Averaged across calendar months, monthly mean temperature shows a difference of +0.89 °C compared with the earlier reference period. This is an unweighted mean of monthly means, not a day-weighted annual average, and it describes average conditions rather than daytime maximum temperatures. The largest monthly increase was in January, with a difference of +2.45 °C; that month-specific result does not imply the same change in every month.

Changes in rainfall

Mean daily rainfall, averaged across calendar months, had a difference of +0.43 mm/day compared with the earlier reference period. This is an unweighted average of monthly means, not a day-weighted annual average, and the measure refers to daily amounts rather than monthly totals. The monthly contrasts were not uniform: January had the largest increase, a difference of +1.59 mm/day, while September had the largest decrease, a difference of -1.80 mm/day. These identify the strongest month-specific changes, not the pattern in every month.

Changes in snowfall

Mean daily snowfall averaged across calendar months had a difference of -0.34 mm/day compared with the earlier reference period. This is an unweighted average of monthly means, not a day-weighted annual average; it summarizes recorded daily amounts and does not establish that snowfall was absent in any month. The largest monthly increase was in December, with a difference of +1.09 mm/day, while the largest decrease was in March, with a difference of -2.38 mm/day. Those contrasts show that month-specific differences varied, rather than describing a uniform change through the year.

Changes in sunshine duration

Mean daily sunshine duration averaged across calendar months shows a difference of -0.24 hours/day. This unweighted average summarizes monthly means, rather than a day-weighted annual total, and does not mean every month changed by the same amount. The largest monthly increase occurred in April, with a difference of +1.08 hours/day; the largest decrease was in May, with a difference of -1.28 hours/day. These daily-hour differences describe particular monthly averages, not sunshine on every day.