Climate Change Chart of Liverpool, Great Britain

Overview of climate changes

Temperature changes

Averaged across calendar months, monthly mean temperature shows a difference of +0.62 °C compared with the earlier reference period; this is an unweighted average of monthly means, not a day-weighted annual figure or a measure of daytime maximum temperatures. The largest monthly increase was in January, at +1.18 °C, while April had the largest decrease, at -0.14 °C. These identify the strongest month-specific differences in the supplied data, rather than a change shared by every month.

Changes in rainfall

Averaged across calendar months, mean daily rainfall had a difference of +0.25 mm/day. This unweighted mean of monthly means describes daily averages across the calendar months; it is not a monthly rainfall total or a day-weighted annual average. The largest monthly increase occurred in March, with a difference of +0.75 mm/day, whereas the largest decrease was in September, at -0.54 mm/day. Those monthly contrasts show that the overall mean difference does not describe the direction or size of change in every month.

Changes in sunshine duration

Mean daily sunshine duration averaged across calendar months had a difference of -0.51 hours/day. This is an unweighted average of monthly means, not a day-weighted annual figure, and it does not imply the same change in every month. The largest monthly decrease was in June, with a difference of -1.16 hours/day in mean daily sunshine duration. This identifies the strongest monthly decrease in the supplied comparison, rather than a uniform change across the calendar.

Changes in snowfall

Averaged across calendar months, mean daily snowfall had a difference of -0.17 mm/day. This unweighted average of monthly means is not a monthly snowfall total or a day-weighted annual average; its rounded difference does not establish that snowfall was absent. The largest monthly decrease was in January, at -2.02 mm/day, while the largest increase was in March, at +0.25 mm/day. These are differences in mean daily snowfall for the specified months, not monthly totals, and they need not reflect the pattern in every other month.