Climate Change Chart of Old Port of Talamanca, Costa Rica

Overview of climate changes

Temperature changes

Across calendar months, monthly mean temperature shows a difference of +0.16 °C averaged across calendar months. This is an unweighted mean of the monthly means, not a day-weighted annual average, and it describes the overall comparison rather than every month. The largest monthly increase was in February, with a difference of +0.48 °C compared with the earlier reference period. In contrast, July had the largest monthly decrease, a difference of -0.21 °C. These are changes in monthly mean temperatures, not daytime maximum temperatures.

Changes in rainfall

Mean daily rainfall had a difference of +1.05 mm/day averaged across calendar months. This unweighted mean of monthly means summarizes the periods; it is not a day-weighted annual average or a monthly rainfall total, and it does not imply the same change in every month. The largest monthly increase in mean daily rainfall occurred in November, with a difference of +5.15 mm/day. The largest monthly decrease was in September, at a difference of -2.37 mm/day. These daily-mean differences describe those months, rather than accumulated rainfall totals.

Changes in sunshine duration

Mean daily sunshine duration differed by -0.01 hours/day averaged across calendar months. This is an unweighted mean of the monthly means, not a day-weighted annual average; it summarizes the comparison and does not describe every month individually. The largest monthly increase in mean daily sunshine was in December, with a difference of +0.85 hours/day. By comparison, April recorded the largest monthly decrease, a difference of -0.77 hours/day. These values concern daily mean sunshine duration in the named months.