Climate Change Chart of Patna, India

Overview of climate changes

Temperature changes

Averaged across calendar months, the difference in monthly mean temperature was +0.08 °C. This is an unweighted comparison of the month-by-month means, not a day-weighted annual average, and these temperatures are not daytime maximums. The largest monthly increase was in November, at a difference of +1.23 °C; the largest monthly decrease was in January, at a difference of -1.87 °C. These contrasting monthly changes show why the small mean difference should not be taken to describe every month.

Changes in rainfall

Averaged across calendar months, mean daily rainfall had a difference of +0.22 mm/day. This is an unweighted mean of monthly averages, not a day-weighted annual figure; rainfall values describe daily means rather than monthly totals. The largest monthly increase occurred in June, with a difference of +2.15 mm/day, while April had the largest decrease, at a difference of -0.85 mm/day. These are changes in mean daily rainfall for those months, not changes in their accumulated monthly totals.

Changes in sunshine duration

Averaged across calendar months, mean daily sunshine duration had a difference of -0.18 hours/day. This unweighted mean describes the aggregate of the calendar-month averages, rather than a day-weighted annual average. The largest monthly decrease was in June, at a difference of -0.79 hours/day; by contrast, the largest increase was in August, at a difference of +0.31 hours/day. These month-specific differences show that the overall mean does not describe the change in every month.