Climate Change Chart of N'Djamena, Chad

Overview of climate changes

Temperature changes

Averaged across calendar months, monthly mean temperature shows a difference of +1.09 °C compared with the earlier reference period; this is an unweighted summary of monthly means, not a day-weighted annual average or a measure of daytime maximum temperatures. The largest monthly increase was in March, with a difference of +2.97 °C. By contrast, January had the largest monthly decrease, a difference of -0.11 °C. These monthly extremes show that the change in the overall mean did not occur uniformly across the calendar.

Changes in rainfall

Mean daily rainfall, averaged across calendar months, had a difference of -0.23 mm/day compared with the earlier period. This unweighted summary describes differences among monthly means; it is not a day-weighted annual average or a monthly rainfall total. The largest monthly decrease was in July, with a difference of -1.98 mm/day in mean daily rainfall. In October, the largest monthly increase was much more modest, at a difference of +0.12 mm/day. These are changes in monthly average daily amounts, not statements about rainfall on every day.

Changes in sunshine duration

Mean daily sunshine duration, averaged across calendar months, had a difference of -0.43 hours/day between the reference periods. This unweighted summary of monthly means is not a day-weighted annual figure. The largest monthly decrease occurred in June, with a difference of -0.90 hours/day in mean daily sunshine duration. That monthly result need not represent each day within the month, and the mean difference across calendar months does not describe a continuous change between the reference periods.