Olathe/Johnson Cnty weather by month
Averages and records for each calendar month at Olathe/Johnson Cnty, United States, from 1996 to 2026. The warmest month is July, averaging 31.2°C; the coolest is January at 4.2°C.
| Month | Avg high | Avg low | Record high | Record low | Years |
|---|---|---|---|---|---|
| January | 4.2°C | −5.9°C | 23.3°C28 January 2015 | −23.3°C28 January 1997 | 30 / 30 |
| February | 6.9°C | −3.9°C | 26.1°C22 February 2017 | −24.9°C16 February 2021 | 30 / 30 |
| March | 13.6°C | 2.1°C | 33.3°C26 March 2026 | −19.4°C12 March 1998 | 30 / 30 |
| April | 18.9°C | 7.4°C | 33.3°C25 April 2012 | −8.2°C4 April 2018 | 30 / 30 |
| May | 23.7°C | 13.0°C | 34.4°C30 May 1998 | 0.0°C2 May 2013 | 29 / 30 |
| June | 29.0°C | 18.5°C | 39.4°C28 June 2012 | 7.8°C1 June 2001 | 30 / 30 |
| July | 31.2°C | 20.7°C | 41.7°C29 July 2012 | 10.6°C5 July 1997 | 31 / 31 |
| August | 30.7°C | 19.8°C | 43.3°C2 August 2011 | 10.6°C24 August 2015 | 31 / 31 |
| September | 26.6°C | 15.2°C | 40.6°C2 September 2000 | 3.3°C13 September 2014 | 30 / 31 |
| October | 19.8°C | 8.5°C | 33.9°C3 October 2006 | −4.9°C31 October 2019 | 30 / 30 |
| November | 12.6°C | 2.0°C | 27.2°C8 November 2006 | −13.8°C12 November 2019 | 30 / 30 |
| December | 6.4°C | −3.5°C | 23.3°C15 December 2021 | −22.1°C18 December 2016 | 30 / 30 |
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 29 to 31 years each.
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Climate at nearby stations
The closest stations with twelve months of archive of their own, nearest first.
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.