Historical Ranked Daily Data for May - Maximum Hourly Rain / mm
Weather Variable:
| Highest | ||
| Rank | Value | Date |
| 1 | 26.4 | 12 May 2025 |
| 2 | 13.1 | 01 May 2010 |
| 3 | 8.1 | 29 May 2018 |
| 4 | 8.1 | 11 May 2016 |
| 5 | 8.0 | 29 May 2017 |
| 6 | 7.5 | 06 May 2015 |
| 7 | 6.9 | 17 May 2017 |
| 8 | 6.6 | 21 May 2024 |
| 9 | 6.3 | 16 May 2010 |
| 10 | 6.1 | 02 May 2024 |
| 11 | 5.8 | 31 May 2016 |
| 12 | 5.6 | 16 May 2021 |
| 13 | 5.2 | 24 May 2025 |
| 14 | 5.2 | 26 May 2011 |
| 15 | 5.0 | 17 May 2021 |
| 16 | 4.9 | 28 May 2013 |
| 17 | 4.9 | 10 May 2012 |
| 18 | 4.9 | 02 May 2010 |
| 19 | 4.6 | 06 May 2024 |
| 20 | 4.6 | 01 May 2012 |
| 21 | 4.4 | 26 May 2009 |
| 22 | 4.3 | 09 May 2023 |
| 23 | 4.2 | 02 May 2019 |
| 24 | 3.9 | 26 May 2024 |
| 25 | 3.8 | 11 May 2023 |
| Lowest | ||
| Rank | Value | Date |
| 1 | 0.0 | 25 May 2021 |
| 2 | 0.0 | 29 May 2021 |
| 3 | 0.2 | 13 May 2013 |
| 4 | 0.2 | 23 May 2014 |
| 5 | 0.2 | 08 May 2015 |
| 6 | 0.2 | 02 May 2016 |
| 7 | 0.2 | 19 May 2016 |
| 8 | 0.2 | 22 May 2016 |
| 9 | 0.2 | 09 May 2019 |
| 10 | 0.2 | 11 May 2019 |
| 11 | 0.2 | 17 May 2019 |
| 12 | 0.2 | 28 May 2019 |
| 13 | 0.2 | 30 May 2019 |
| 14 | 0.2 | 23 May 2020 |
| 15 | 0.2 | 01 May 2022 |
| 16 | 0.2 | 16 May 2022 |
| 17 | 0.2 | 25 May 2022 |
| 18 | 0.2 | 05 May 2023 |
| 19 | 0.2 | 12 May 2023 |
| 20 | 0.2 | 13 May 2025 |
| 21 | 0.2 | 26 May 2025 |
| 22 | 0.2 | 28 May 2025 |
| 23 | 0.2 | 29 May 2025 |
| 24 | 0.2 | 18 May 2026 |
| 25 | 0.2 | 20 May 2026 |
Ranked daily data from 2009 to present for London, NW3. For Maximum Hourly Rain, there are 182 valid values in May.