Climate Change Chart of Trenton, USA

Overview of climate changes

Temperature changes

Averaged across calendar months, the difference in monthly mean temperature was +0.73 °C compared with the earlier reference period. This is an unweighted summary of the monthly means, not a day-weighted annual average, and it does not imply that every month was warmer. The largest monthly increase was in December, with a difference of +2.18 °C. By contrast, November had the largest monthly decrease, a difference of -0.37 °C. These are monthly mean temperatures, not daytime maximum temperatures.

Changes in rainfall

Averaged across calendar months, mean daily rainfall had a difference of +0.32 mm/day. This unweighted summary describes the average of the monthly means; it is not a daily-total or monthly-total comparison, and it does not mean that rainfall increased in every month. The largest monthly increase in mean daily rainfall occurred in October, with a difference of +1.18 mm/day. The largest decrease was in November, at a difference of -0.55 mm/day. These figures describe daily means within those months, not monthly rainfall totals.

Changes in sunshine duration

Averaged across calendar months, mean daily sunshine duration had a difference of -0.14 hours/day compared with the earlier reference period. This is an unweighted average of monthly means, so it summarizes the calendar months rather than indicating the change in every month. The largest monthly increase in mean daily sunshine was in July, with a difference of +0.83 hours/day; the largest decrease was in February, at a difference of -0.80 hours/day. These monthly figures describe average daily sunshine duration, not total sunshine over each month.

Changes in snowfall

Averaged across calendar months, mean daily snowfall had a difference of +0.35 mm/day. This unweighted summary concerns monthly mean daily amounts, not monthly snowfall totals, and does not indicate an increase in every month. The largest monthly increase in mean daily snowfall was in March, with a difference of +2.80 mm/day. In December, the largest monthly decrease was a difference of -0.36 mm/day. Both describe mean daily snowfall in the named month, rather than a monthly total.