How often does weather delay flights at Toulouse-Blagnac?
From January 2018 to September 2026, EUROCONTROL recorded arrival restrictions for weather (regulation reason W) at Toulouse-Blagnac (TLS) on 124 of 3,195 days (3.9%). The worst month is December: 12% of days and 0.2 minutes of weather delay per arriving flight on average. Calmest: July–September (0% of days). Weather caused 28% of all arrival-regulation delay minutes at this airport. Source: EUROCONTROL.
Month by month
| Month | Days with weather restrictions | Days with ≥ 1 min per arrival | Minutes per arriving flight |
|---|---|---|---|
| January | 12% | 4% | 0.14 |
| February | 7% | 2% | 0.06 |
| March | 1% | 0% | 0.00 |
| April | 1% | 1% | 0.07 |
| May | 1% | 0% | 0.00 |
| June | 1% | 1% | 0.02 |
| July | 0% | 0% | 0.00 |
| August | 0% | 0% | 0.00 |
| September | 0% | 0% | 0.02 |
| October | 6% | 3% | 0.18 |
| November | 7% | 3% | 0.13 |
| December | 12% | 6% | 0.25 |
Share of days on which EUROCONTROL's network manager limited arrivals because of weather at or around the airport (regulation reason W), 2018–2026. Minutes per arriving flight = weather-regulation delay ÷ all arrivals that month. Worst weeks of the year: week 1 (22%), week 2 (13%), week 4 (13%).
Year by year
| Year | Days with weather restrictions | Minutes per arriving flight | Arrivals |
|---|---|---|---|
| 2018 | 25 of 365 | 0.08 | 48,356 |
| 2019 | 11 of 365 | 0.04 | 47,621 |
| 2020 | 10 of 366 | 0.06 | 20,469 |
| 2021 | 12 of 365 | 0.24 | 23,794 |
| 2022 | 14 of 365 | 0.02 | 34,893 |
| 2023 | 13 of 365 | 0.05 | 36,795 |
| 2024 | 23 of 366 | 0.08 | 36,293 |
| 2025 | 7 of 365 | 0.08 | 34,658 |
| 2026 (Jan–Sep) | 9 of 273 | 0.03 | 25,700 |
2020–2021: far fewer flights during the pandemic.
Weather among all causes
| Cause of arrival regulation | Share of delay minutes |
|---|---|
| Atc staffing | 29% |
| Weather | 28% |
| Atc equipment | 15% |
| Special event | 10% |
| Air traffic control capacity | 7% |
| Aerodrome capacity | 6% |
| Other | 3% |
Causes with at least 2% of all arrival-regulation delay minutes, 2018–2026.
What the weather was like on those days
| In the airport's weather reports (METAR, 05–21 UTC) | Days with weather restrictions | Other days | Ratio |
|---|---|---|---|
| Thunderstorm reported | 2.4% | 5.9% | 0.4× |
| Fog or visibility under 800 m | 77% | 2.2% | 35.0× |
| Cloud base at or below 200 ft | 26% | 0.5% | — |
| Gusts of 30 knots or more | 0.8% | 7.8% | — |
| Crosswind of 20 knots or more on the best runway | 0.8% | 0.9% | — |
| Snow | 0.0% | 0.7% | — |
| Freezing rain or drizzle | 0.0% | 0.0% | — |
On 14% of the restriction days none of these showed up in the airport's own reports: restrictions are also set on forecasts, for weather on the approach or elsewhere in the area, and when the wind direction forces a less efficient runway layout. The weather is what came with the delays, not proof of their cause. Based on 3,195 days with full METAR coverage.
The heaviest days
| Date and reported weather | Weather delay, minutes | Arrivals | Minutes per arrival |
|---|---|---|---|
| 27 October 2021 Fog or visibility under 800 m | 2,130 | 85 | 25.1 |
| 28 April 2025 Fog or visibility under 800 m | 1,279 | 111 | 11.5 |
| 11 December 2018 Fog or visibility under 800 m | 1,035 | 130 | 8.0 |
| 23 October 2021 Fog or visibility under 800 m | 955 | 62 | 15.4 |
| 8 December 2025 Fog or visibility under 800 m | 941 | 111 | 8.5 |
What these numbers cover
- Only delays from air traffic flow management (ATFM) regulations on arrivals are counted — not all delays, not departures, and not cancellations or diversions. A day with restrictions does not mean every flight was late.
- Airport ICAO code LFBO, IATA TLS. Ranking by share of restriction days: 40 of 94 airports on this site.