Climate Change Chart of Valletta, Malta

Overview of climate changes

Temperature changes

The mean difference in monthly mean temperature, averaged across calendar months, was a difference of +1.08 °C compared with the earlier reference period. This is an unweighted comparison of monthly means, not a day-weighted annual average, and it describes average conditions rather than daytime maximum temperatures. The largest monthly increase occurred in July, with a difference of +2.13 °C. This identifies the strongest monthly increase among the supplied temperature differences; it does not imply that every month warmed by the same amount.

Changes in rainfall

Averaged across calendar months, mean daily rainfall showed a difference of 0.00 mm/day between the reference periods at the displayed precision. This unweighted comparison of monthly means is not a day-weighted annual average, and daily amounts should not be read as monthly rainfall totals. The largest monthly increase in mean daily rainfall was in November, at a difference of +0.58 mm/day. By contrast, December had the largest monthly decrease, with a difference of -1.41 mm/day. These distinct monthly changes show why an unchanged mean at the displayed precision does not mean rainfall was unchanged in every month.

Changes in sunshine duration

Mean daily sunshine duration, averaged across calendar months, had a difference of -0.20 hours/day compared with the earlier reference period. This is an unweighted mean of monthly averages, not a day-weighted annual figure. The largest monthly decrease was in April, with a difference of -0.55 hours/day, while December recorded the largest monthly increase, a difference of +0.11 hours/day. These are changes in mean daily hours for the named months, not descriptions of every day's sunshine.

Changes in snowfall

Averaged across calendar months, mean daily snowfall had a difference of +0.01 mm/day between the reference periods. This unweighted comparison describes monthly averages; the small difference should be interpreted at the displayed precision and does not establish that snowfall was absent. The largest monthly increase in mean daily snowfall was in February, with a difference of +0.06 mm/day. This monthly comparison concerns daily mean amounts, not monthly snowfall totals.