Climate Change Chart of Indianapolis, USA

Overview of climate changes

Temperature changes

Averaged across calendar months, monthly mean temperature shows a difference of +1.24 °C compared with the earlier reference period; this unweighted mean summarizes monthly averages, not daytime highs or a change in every month. The largest monthly increase was in December, at +2.60 °C, so that month stands out in the comparison without implying a continuous trend.

Changes in rainfall

Mean daily rainfall averaged across calendar months was higher by +0.38 mm/day in the more recent period. The largest monthly increase occurred in July, with a difference of +1.56 mm/day, while November had the largest decrease, a difference of -0.60 mm/day. These are daily averages rather than monthly totals, and they do not establish how often rain fell.

Changes in sunshine duration

Mean daily sunshine duration averaged across calendar months was lower by -0.23 hours/day. The largest monthly decrease was in July, with a difference of -0.93 hours/day; by contrast, June recorded the largest increase, a difference of +0.42 hours/day. These monthly averages describe typical daily duration, not the conditions on any particular day.

Changes in snowfall

Mean daily snowfall averaged across calendar months was higher by +0.19 mm/day. The largest increase was in February, with a difference of +1.75 mm/day, while the largest decrease was in December, a difference of -1.01 mm/day; these daily averages are not monthly snowfall totals.