Climate Change Chart of Mumbai, India

Overview of climate changes

Temperature changes

Averaged across calendar months, monthly mean temperature shows a difference of +0.72 °C in the more recent period; this is an unweighted mean of monthly averages, not a day-weighted annual temperature or a measure of daytime highs. The largest monthly increase was in November, at +1.27 °C, while January had the largest decrease, -0.05 °C. These extrema describe differences between the reference-period averages for those months, not a continuous change over time.

Changes in rainfall

Averaged across calendar months, mean daily rainfall had a difference of -1.01 mm/day compared with the earlier reference period. This is an unweighted average of monthly mean daily amounts, not an annual total or a day-weighted measure. The largest monthly decrease was in July, at -7.28 mm/day, whereas September recorded the largest increase, +4.57 mm/day. These monthly differences describe averages between the periods and do not imply that rainfall changed by the same amount on every day.

Changes in sunshine duration

Mean daily sunshine duration averaged across calendar months had a difference of +0.01 hours/day between the reference periods, a near-zero change at the displayed precision. This unweighted average of monthly means does not describe every month individually. The largest increase occurred in August, at +1.24 hours/day, while the largest decrease was in September, at -0.88 hours/day. The contrasting monthly differences show why the small overall mean does not mean that sunshine duration was unchanged in each month.