Boulogne-Billancourt Half Marathon: race-day weather at past editions
Boulogne-Billancourt Half Marathon: at 9:00 on race day the temperature averaged 6 °C over 19 editions with known dates from 2002 to 2025 (from −1 °C to 13 °C); rain fell during race hours (08:00–14:00) in 6 editions (32%). Source: ERA5 reanalysis (Copernicus), data to 2025.
6 °Caverage at 9:00 on race day
6 / 19editions with rain 08–14 h
0 / 19editions with ≥ 20 °C by 14:00
15 °C (2005)warmest race morning–midday
Climate, not a forecast: these are statistics of past weather, not a forecast for the next edition.
Climate of the usual dates
Weather around the usual race date (17 November, ± 3 days) in 1991–2025:
- 6 °C — average temperature at 9:00
- 22% — share of mornings with rain 08–14 h
- 10 °C — average daily maximum
Average daily maximum on these dates: 8.9 °C in 1991–2005, 10.8 °C in 2011–2025.
Weather at past editions
| Year | Date | 9:00 | Max 08–14 | Rain 08–14 |
|---|---|---|---|---|
| 2025 | 16 November | 8 °C | 11 °C | 0.0 mm |
| 2024 | 17 November | 6 °C | 9 °C | 0.1 mm |
| 2023 | 26 November | 0 °C | 7 °C | 0.0 mm |
| 2022 | 27 November | 6 °C | 9 °C | 2.5 mm |
| 2021 | 21 November | 6 °C | 8 °C | 1.8 mm |
| 2019 | 17 November | 4 °C | 8 °C | 0.0 mm |
| 2018 | 18 November | 2 °C | 8 °C | 0.0 mm |
| 2017 | 19 November | 7 °C | 9 °C | 0.0 mm |
| 2016 | 20 November | 12 °C | 13 °C | 1.3 mm |
| 2011 | 20 November | 3 °C | 11 °C | 0.0 mm |
| 2010 | 14 November | 13 °C | 14 °C | 1.8 mm |
| 2009 | 15 November | 11 °C | 15 °C | 0.0 mm |
| 2008 | 16 November | 11 °C | 12 °C | 0.1 mm |
| 2007 | 18 November | −1 °C | 3 °C | 0.0 mm |
| 2006 | 19 November | 8 °C | 10 °C | 0.8 mm |
| 2005 | 6 November | 8 °C | 15 °C | 0.0 mm |
| 2004 | 14 November | 4 °C | 9 °C | 0.0 mm |
| 2003 | 16 November | 7 °C | 7 °C | 3.7 mm |
| 2002 | 17 November | 7 °C | 11 °C | 0.0 mm |
How to read these numbers
- ERA5 gives daytime highs about 1–2.5 °C below nearby weather stations, so on warm race days runners felt more heat than the numbers here show; we do not correct for this.
- Edition window: the race day; 9:00 local time is taken as the typical start.
- No dates found for 2012, 2013, 2014, 2015: these editions are not counted.
- Dates of past editions: Wikidata and Wikipedia (de, en, fr); cancelled editions (e.g. 2020–21) are not counted.
Dates and sources
Coordinates: 48.835, 2.241; ERA5 cell centred at 48.75, 2.25 (average ground height of the cell 104 m).