Climate Change Chart of Annapolis, USA

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 mean of monthly means, not a day-weighted annual average or a measure of daytime highs. The change was not uniform across the highlighted months: April had the largest monthly increase, a difference of +1.60 °C, while November had the largest monthly decrease, a difference of -0.70 °C. These monthly contrasts describe the specified averages, rather than every individual day or a continuous change between periods.

Changes in rainfall

For mean daily rainfall, the unweighted average of monthly means shows a difference of +0.78 mm/day across calendar months in the more recent period; this is not a comparison of annual totals or a day-weighted annual average. Monthly differences varied: June had the largest increase, with a difference of +2.02 mm/day, whereas January had the largest decrease, with a difference of -0.55 mm/day. These values describe daily mean amounts for the indicated months, not monthly rainfall totals, and do not imply that every day or month changed in the same way.

Changes in snowfall

Mean daily snowfall also differed between the reference periods. Averaged across calendar months, the unweighted mean of monthly means shows a difference of +0.29 mm/day; this is not a day-weighted annual average or a snowfall total. Monthly changes were not uniform: March had the largest increase, a difference of +1.60 mm/day, while December had the largest decrease, a difference of -0.62 mm/day. These figures concern daily mean snowfall amounts in the named months, not monthly totals, and do not indicate the same difference on every day.

Changes in sunshine duration

Mean daily sunshine duration averaged across calendar months had a difference of -0.12 hours/day compared with the earlier reference period, using an unweighted average of monthly means rather than a day-weighted annual measure. The monthly pattern was mixed: July recorded the largest increase, a difference of +0.54 hours/day, while February recorded the largest decrease, a difference of -0.70 hours/day. These are differences in mean daily hours for the specified months; they do not describe every day or establish a continuous trend between the reference periods.