Climate Change Chart of Dover, USA

Overview of climate changes

Temperature changes

Averaged across calendar months, monthly mean temperature shows a difference of +0.58 °C. This is an unweighted comparison of monthly means, not a day-weighted annual average, and it does not mean every month was warmer. The largest monthly increase was in December, with a difference of +1.96 °C; by contrast, November had the largest decrease, at -0.47 °C. These monthly means describe average temperatures, not daytime highs.

Changes in rainfall

For mean daily rainfall, averaged across calendar months, the difference was +0.53 mm/day. This unweighted mean of monthly values is not a day-weighted annual average, and it describes an overall comparison rather than a change in every month. The largest monthly increase occurred in October, with a difference of +1.55 mm/day, while November recorded the largest decrease, at -0.74 mm/day. These figures are daily means, not monthly rainfall totals.

Changes in snowfall

Mean daily snowfall averaged across calendar months had a difference of +0.32 mm/day. This unweighted mean summarizes the monthly comparisons; it is not a day-weighted annual average and does not imply that every month changed in the same direction. The largest monthly increase was in March, with a difference of +1.61 mm/day, while December had the largest decrease, at -0.39 mm/day. These are mean daily snowfall amounts, not monthly totals.

Changes in sunshine duration

Mean daily sunshine duration averaged across calendar months had a difference of -0.30 hours/day. This unweighted comparison of monthly means does not imply the same change in every month. The largest monthly increase was in July, with a difference of +0.61 hours/day, whereas February had the largest decrease, at -0.75 hours/day. The figures describe average daily sunshine hours, not a continuous change between the reference periods.