Heuvelroute, stage 3: Halle → Tienen
On stage 3 (Halle → Tienen, 109 km) the best month is September: 77% of days were dry with highs of 10–30 °C, and riding Halle → Tienen meant an average tailwind of 3.5 km/h (ERA5 2006–2025, 9:00–18:00).
Weather by month
| Month | Good days | Rain days ≥ 1 mm | Rain, mm | Avg high | Days ≥ 30 °C | Days < 10 °C | Daylight, h |
|---|---|---|---|---|---|---|---|
| January | 8% | 27% | 71 | 6 °C | 0% | 85% | 8.4 † |
| February | 17% | 29% | 61 | 7 °C | 0% | 73% | 9.9 † |
| March | 46% | 25% | 58 | 11 °C | 0% | 45% | 11.7 |
| April | 68% | 23% | 43 | 15 °C | 0% | 16% | 13.8 |
| May | 72% | 27% | 68 | 18 °C | 0% | 2% | 15.5 |
| June | 72% | 26% | 75 | 21 °C | 3% | 0% | 16.5 |
| July | 67% | 27% | 74 | 23 °C | 6% | 0% | 16.1 |
| August | 65% | 29% | 80 | 23 °C | 7% | 0% | 14.5 |
| September | 77% | 22% | 58 | 20 °C | 1% | 0% | 12.5 |
| October | 72% | 23% | 68 | 15 °C | 0% | 7% | 10.6 † |
| November | 36% | 27% | 66 | 10 °C | 0% | 49% | 8.8 † |
| December | 13% | 25% | 75 | 7 °C | 0% | 77% | 8.0 † |
Best months are all months within 3 percentage points of the best one. † less than 11 hours of daylight — long stages get tight.
Wind by month
| Month | Wind Halle → Tienen, km/h | Headwind > 15 km/h, Halle → Tienen | Headwind > 15 km/h, Tienen → Halle | Better way |
|---|---|---|---|---|
| January | +6.0 | 3% | 23% | Halle → Tienen |
| February | +4.4 | 6% | 21% | Halle → Tienen |
| March | +3.2 | 7% | 19% | Halle → Tienen |
| April | +1.4 | 6% | 12% | either |
| May | +3.2 | 4% | 15% | Halle → Tienen |
| June | +4.0 | 2% | 14% | Halle → Tienen |
| July | +6.3 | 1% | 18% | Halle → Tienen |
| August | +5.8 | 1% | 16% | Halle → Tienen |
| September | +3.5 | 3% | 14% | Halle → Tienen |
| October | +3.7 | 3% | 16% | Halle → Tienen |
| November | +4.8 | 2% | 17% | Halle → Tienen |
| December | +6.0 | 2% | 22% | Halle → Tienen |
Along the route (sections of about 25 km)
| km | Heading | Tailwind in September, km/h |
|---|---|---|
| 228–253 | E | +3.9 |
| 253–278 | NE | +4.5 |
| 278–303 | E | +2.8 |
| 303–329 | SE | +2.4 |
| 329–337 | NE | +4.6 |
Other stages
- Poperinge → Anzegem 116 km
- Anzegem → Halle 112 km
- Halle → Tienen 109 km
- Tienen → Hombourg 114 km
How to read the numbers
Wind is the 10 m wind of a 25-km grid cell, daytime hours 9:00–18:00 local solar time; at saddle height in a sheltered valley it is weaker, on a coast or ridge stronger. A positive value is a tailwind. ERA5 slightly over-counts days with ≥ 1 mm of rain (by about 5–7 percentage points) and underestimates daily highs by 1–2 °C. Good day = less than 1 mm of rain between 9:00 and 18:00 (riding hours, local solar time) and a high between 10 and 30 °C; rain at night or in the evening does not spoil it.