Indianapolis Intl climate by month
Averages and records for each calendar month at Indianapolis Intl, United States, from 1948 to 2026. The warmest month is July, averaging 29.7°C; the coolest is January at 1.9°C.
| Month | Avg high | Avg low | Record high | Record low | Years |
|---|---|---|---|---|---|
| January | 1.9°C | −6.9°C | 21.7°C25 January 1950 | −32.8°C19 January 1994 | 79 / 79 |
| February | 4.5°C | −5.0°C | 25.0°C20 February 2018 | −29.4°C10 February 1982 | 79 / 79 |
| March | 10.7°C | 0.1°C | 31.1°C22 March 2026 | −21.7°C2 March 1980 | 79 / 79 |
| April | 17.5°C | 5.8°C | 31.7°C30 April 1970 | −7.8°C13 April 1950 | 79 / 79 |
| May | 23.1°C | 11.4°C | 35.0°C28 May 2018 | −2.7°C9 May 2020 | 79 / 79 |
| June | 28.0°C | 16.7°C | 40.0°C28 June 2012 | 2.8°C22 June 1992 | 79 / 79 |
| July | 29.7°C | 18.8°C | 40.6°C6 July 2012 | 8.9°C4 July 1968 | 79 / 79 |
| August | 28.9°C | 17.7°C | 38.9°C16 August 1988 | 5.0°C29 August 1965 | 79 / 79 |
| September | 25.6°C | 13.5°C | 37.8°C1 September 1953 | 0.0°C30 September 1993 | 78 / 79 |
| October | 18.9°C | 7.0°C | 33.3°C1 October 2019 | −6.7°C26 October 1962 | 78 / 78 |
| November | 10.9°C | 1.1°C | 27.2°C1 November 1950 | −18.9°C25 November 1950 | 78 / 78 |
| December | 4.4°C | −4.0°C | 23.3°C2 December 1982 | −30.6°C22 December 1989 | 78 / 78 |
Years shows the number behind the average high, then the number holding a record for that month. They differ because a year contributes an average only when the month has at least 25 days of readings, while a single reading is enough to set a record. The average low is withheld on the same 25-day rule and is counted separately again; it is shown as a dash where the archive cannot support it. Across the twelve months here the averages rest on 78 to 79 years each.
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Every figure on this page is computed from NOAA GHCN-Daily observations stored per station, per year, per month. Nothing is modelled, interpolated or estimated, and a month the archive never covered is left out rather than filled in. A station appears here only once all twelve months carry an average from at least 10 years. See how this is built.