Round Rock weather by month
Measured at Lago Vista/Allen Arpt
Averages and records for each calendar month at Lago Vista/Allen Arpt, United States, from 2014 to 2026. The warmest month is August, averaging 36.2°C; the coolest is January at 15.8°C.
| Month | Avg high | Avg low | Record high | Record low | Years |
|---|---|---|---|---|---|
| January | 15.8°C | 4.8°C | 28.9°C2 January 2026 | −9.9°C17 January 2018 | 12 / 12 |
| February | 18.4°C | 7.1°C | 32.2°C23 February 2017 | −15.5°C15 February 2021 | 12 / 12 |
| March | 23.8°C | 12.0°C | 33.9°C14 March 2025 | −4.3°C5 March 2019 | 11 / 12 |
| April | 26.1°C | 14.9°C | 36.7°C5 April 2022 | 3.3°C7 April 2018 | 12 / 12 |
| May | 29.7°C | 18.7°C | 38.3°C7 May 2022 | 8.9°C2 May 2026 | 12 / 12 |
| June | 33.5°C | 22.5°C | 40.6°C11 June 2022 | 15.6°C2 June 2021 | 12 / 12 |
| July | 35.4°C | 23.6°C | 42.8°C23 July 2018 | 17.8°C25 July 2019 | 12 / 12 |
| August | 36.2°C | 23.8°C | 41.7°C17 August 2023 | 18.3°C22 August 2020 | 10 / 11 |
| September | 32.8°C | 21.4°C | 40.6°C8 September 2023 | 11.7°C29 September 2020 | 11 / 12 |
| October | 27.6°C | 16.2°C | 36.7°C12 October 2015 | −1.0°C31 October 2019 | 10 / 11 |
| November | 20.6°C | 10.7°C | 31.7°C1 November 2016 | −4.3°C12 November 2019 | 10 / 12 |
| December | 18.1°C | 8.1°C | 30.6°C30 December 2024 | −11.6°C23 December 2022 | 11 / 12 |
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 10 to 12 years each.
See what Lago Vista/Allen Arpt is doing right now
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.