Climate Chart of Indianapolis, USA

Monthly data: Temperature °C, Rain (mm), Sunshine (h) · 2013–2023

Climate overview

Temperature

The monthly mean temperature is lowest at -1.5 °C in January and reaches its high at 24.1 °C in July. These figures describe average temperatures across each month, not daytime maximums, so they should not be read as a forecast of what any particular afternoon will feel like. Across the calendar-month means, the unweighted mean temperature is 12.1 °C. It provides a broad summary, rather than a day-weighted annual average or a description of the conditions in any single month.

Rain

Mean daily rainfall is highest at 3.83 mm/day in May and lowest at 2.19 mm/day in January. These are average daily amounts, not monthly accumulations; the lower figure does not mean that every day is dry or show how often rain occurs. The unweighted mean of the monthly daily-rainfall means is 2.93 mm/day. It offers a useful overall reference, but cannot specify rainfall on a particular date.

Snow

Mean daily snowfall is highest at 5.02 mm/day in February. This is an average amount, not a monthly total, and it does not establish how many days have snow, snow depth or snow cover. The unweighted mean of the monthly daily-snowfall means is 1.36 mm/day.

Sunshine

Mean daily sunshine reaches 11.30 hours/day in July, while the lowest monthly mean is 4.79 hours/day in December. These figures can help with broad outdoor-planning expectations, but sunshine duration is not the same as daylight length and does not guarantee clear skies on a given day. The unweighted mean across the monthly sunshine means is 8.17 hours/day per day. It is a summary across calendar months, not a promise of that amount on each day.

Best Travel Time Guide for Indianapolis, USA: Ideal Seasons and Weather Insights

For visitors prioritising cooler monthly averages, January is the relevant reference point, with a mean temperature of -1.5 °C. Pack for variable day-to-day conditions rather than treating that monthly mean as a daytime high or a guarantee about the weather during a visit. If lower average rainfall is the priority, January is the conditional option, with mean daily rainfall of 2.19 mm/day. It does not guarantee dry days or indicate rain frequency; for preparation, note that the highest monthly mean daily rainfall is 3.83 mm/day in May. For outdoor sightseeing planned around typical sunshine, July has the highest mean daily sunshine at 11.30 hours/day, while December has the lowest at 4.79 hours/day. Sunshine duration is not day length, and these averages cannot promise the conditions on a particular day.

Snowfall averages also merit consideration in winter travel planning: the highest mean daily amount is 5.02 mm/day in February. This measure alone cannot tell you whether snow will fall during your visit, how deep it may be or whether snow cover will persist, so it should not be used to assume skiing or other snow conditions.

Climate Data Overview for Indianapolis, USA

Explore the comprehensive climate data for Indianapolis, USA. This detailed table provides valuable insights into temperature variations, precipitation levels, and seasonal changes, helping you understand the unique weather patterns of this region.

• See also climate change in Indianapolis
• Explore the climate in USA