Historical Ranked Monthly Data for Sep - Maximum Rain Rate / mm/h
Weather Variable:
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| Top monthly mean | ||
| Rank | Value | Date |
| 1 | 46 | Sep 2014 |
| 2 | 37 | Sep 2016 |
| 3 | 30 | Sep 2015 |
| 4 | 29 | Sep 2023 |
| 5 | 26 | Sep 2024 |
| 6 | 21 | Sep 2019 |
| 7 | 20 | Sep 2011 |
| 8 | 19 | Sep 2010 |
| 9 | 19 | Sep 2012 |
| Bottom monthly mean | ||
| Rank | Value | Date |
| 1 | 8 | Sep 2018 |
| 2 | 8 | Sep 2013 |
| 3 | 11 | Sep 2020 |
| 4 | 15 | Sep 2017 |
| 5 | 17 | Sep 2022 |
| 6 | 17 | Sep 2021 |
| 7 | 18 | Sep 2009 |
| 8 | 18 | Sep 2025 |
| 9 | 19 | Sep 2012 |
Maximum Rain Rate monthly extremes: highest and lowest monthly means.
There are 17 valid months for the chosen period from 2009 to present for Sep in London, NW3.