Historical Ranked Daily Data for May - Mean Rain Rate / mm/h
Weather Variable:
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| Highest | ||
| Rank | Value | Date |
| 1 | 19 | 12 May 2025 |
| 2 | 5 | 29 May 2017 |
| 3 | 5 | 01 May 2010 |
| 4 | 4.8 | 26 May 2011 |
| 5 | 4.1 | 29 May 2018 |
| 6 | 3.2 | 06 May 2015 |
| 7 | 3.0 | 02 May 2024 |
| 8 | 3.0 | 17 May 2021 |
| 9 | 3.0 | 18 May 2011 |
| 10 | 2.8 | 28 May 2018 |
| 11 | 2.6 | 01 May 2020 |
| 12 | 2.6 | 26 May 2019 |
| 13 | 2.6 | 24 May 2019 |
| 14 | 2.6 | 22 May 2014 |
| 15 | 2.5 | 17 May 2017 |
| 16 | 2.5 | 16 May 2010 |
| 17 | 2.5 | 03 May 2017 |
| 18 | 2.3 | 05 May 2015 |
| 19 | 2.2 | 11 May 2016 |
| 20 | 2.1 | 05 May 2021 |
| 21 | 2.1 | 24 May 2025 |
| 22 | 2.1 | 31 May 2016 |
| 23 | 2.0 | 11 May 2023 |
| 24 | 2.0 | 28 May 2017 |
| 25 | 2.0 | 01 May 2012 |
| Lowest | ||
| Rank | Value | Date |
| 1 | 0.2 | 17 May 2019 |
| 2 | 0.2 | 28 May 2025 |
| 3 | 0.2 | 15 May 2015 |
| 4 | 0.2 | 29 May 2013 |
| 5 | 0.2 | 11 May 2014 |
| 6 | 0.2 | 19 May 2016 |
| 7 | 0.2 | 10 May 2023 |
| 8 | 0.3 | 09 May 2019 |
| 9 | 0.3 | 12 May 2013 |
| 10 | 0.3 | 19 May 2017 |
| 11 | 0.3 | 10 May 2022 |
| 12 | 0.3 | 14 May 2012 |
| 13 | 0.3 | 29 May 2019 |
| 14 | 0.4 | 30 May 2011 |
| 15 | 0.4 | 09 May 2013 |
| 16 | 0.4 | 18 May 2015 |
| 17 | 0.4 | 27 May 2009 |
| 18 | 0.4 | 28 May 2024 |
| 19 | 0.4 | 26 May 2018 |
| 20 | 0.4 | 30 May 2018 |
| 21 | 0.4 | 10 May 2019 |
| 22 | 0.4 | 11 May 2019 |
| 23 | 0.4 | 25 May 2025 |
| 24 | 0.4 | 02 May 2026 |
| 25 | 0.4 | 17 May 2026 |
Ranked daily data from 2009 to present for London, NW3. For Mean Rain Rate, there are 160 valid values in May.