Boston Marathon 2023
Boston · April 17, 2023 · 26,623 finishers
- Where the field cracked
- 30 km
- Negative splits
- 10.9%
- Median finish
- 3:33:53
- Finishers
- 26,623
Largest drop in pace between two mats.
Share of the field that ran the second half faster.
Fade, by finish time
Fade tracks ability, so a single field-wide median would compare you against people running a different race. Each band below is the median for runners who finished near your time.
| Band | Median fade |
|---|---|
| <3:00 | 2.7% |
| 3:00-3:30 | 4.3% |
| 3:30-4:00 | 5.9% |
| 4:00-4:30 | 9.4% |
| 4:30-5:00 | 12.1% |
| >5:00 | 16.2% |
Race conditions
- Temp.
- 8.6°C – 16.3°C
- Humidity at peak
- 90%
- Wind
- 12 km/h – 18 km/h
Temperature ran from 8.6°C to 16.3°C. At its hottest, the air was at 90% humidity.
Hour by hour
| Hour | Temp. | Humidity | Wind |
|---|---|---|---|
| 09:00 | 8.6°C | 93% | 13 km/h |
| 10:00 | 9.4°C | 91% | 12 km/h |
| 11:00 | 9.6°C | 91% | 13 km/h |
| 12:00 | 10.9°C | 87% | 15 km/h |
| 13:00 | 11.8°C | 86% | 17 km/h |
| 14:00 | 11.9°C | 90% | 17 km/h |
| 15:00 | 13.5°C | 87% | 18 km/h |
| 16:00 | 14.6°C | 86% | 16 km/h |
| 17:00 | 15.8°C | 90% | 13 km/h |
| 18:00 | 16.3°C | 90% | 16 km/h |
Hourly data from open-meteo. Peak wind 18 km/h. Times in the race's own zone.