EuroVelo 1 - Atlantic Coast Route - part Ireland, stage 21: Cookstown → Belfast
On stage 21 (Cookstown → Belfast, 96 km) the best month is September: 72% of days were dry with highs of 10–30 °C, and riding Cookstown → Belfast meant an average tailwind of 4.0 km/h (ERA5 2006–2025, 9:00–18:00).
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Weather by month
| Month | Good days | Rain days ≥ 1 mm | Rain, mm | Avg high | Days ≥ 30 °C | Days < 10 °C | Daylight, h |
|---|---|---|---|---|---|---|---|
| January | 14% | 23% | 69 | 7 °C | 0% | 80% | 7.8 † |
| February | 18% | 24% | 63 | 8 °C | 0% | 75% | 9.6 † |
| March | 31% | 30% | 66 | 9 °C | 0% | 57% | 11.7 |
| April | 61% | 28% | 56 | 12 °C | 0% | 22% | 14.0 |
| May | 66% | 33% | 67 | 15 °C | 0% | 4% | 16.0 |
| June | 67% | 33% | 78 | 17 °C | 0% | 0% | 17.2 |
| July | 64% | 36% | 86 | 19 °C | 0% | 0% | 16.7 |
| August | 65% | 35% | 90 | 18 °C | 0% | 0% | 14.9 |
| September | 72% | 28% | 71 | 16 °C | 0% | 0% | 12.6 |
| October | 69% | 26% | 82 | 13 °C | 0% | 5% | 10.4 † |
| November | 35% | 23% | 79 | 10 °C | 0% | 50% | 8.3 † |
| December | 17% | 25% | 79 | 8 °C | 0% | 70% | 7.3 † |
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 Cookstown → Belfast, km/h | Headwind > 15 km/h, Cookstown → Belfast | Headwind > 15 km/h, Belfast → Cookstown | Better way |
|---|---|---|---|---|
| January | +5.5 | 5% | 21% | Cookstown → Belfast |
| February | +4.0 | 8% | 21% | Cookstown → Belfast |
| March | +2.8 | 9% | 19% | Cookstown → Belfast |
| April | +0.7 | 10% | 13% | either |
| May | +1.8 | 7% | 14% | either |
| June | +2.6 | 4% | 13% | Cookstown → Belfast |
| July | +4.2 | 3% | 13% | Cookstown → Belfast |
| August | +5.1 | 3% | 17% | Cookstown → Belfast |
| September | +4.0 | 5% | 17% | Cookstown → Belfast |
| October | +3.0 | 7% | 17% | Cookstown → Belfast |
| November | +4.2 | 6% | 17% | Cookstown → Belfast |
| December | +5.2 | 5% | 21% | Cookstown → Belfast |
Along the route (sections of about 25 km)
| km | Heading | Tailwind in September, km/h |
|---|---|---|
| 2,435–2,461 | SE | +0.3 |
| 2,461–2,486 | E | +4.8 |
| 2,486–2,511 | E | +5.2 |
| 2,511–2,532 | NE | +6.0 |
Other stages
- Ballygerry → Trá Mhór 130 km
- Trá Mhór → Midleton 129 km
- Midleton → Clonakilty 137 km
- Clonakilty → near Schull 122 km
- near Schull → Castletownbere 122 km
- Castletownbere → near Killorglin 122 km
- near Killorglin → Killorglin 115 km
- Killorglin → Tralee 109 km
- Tralee → Limerick 120 km
- Limerick → Kilrush 110 km
- Kilrush → Lehinch 120 km
- Lehinch → Galway 127 km
- Galway → near Clifden 121 km
- near Clifden → Westport 109 km
- Westport → near Knocknalower 122 km
- near Knocknalower → near Ballina 121 km
- near Ballina → Ballyshannon 137 km
- Ballyshannon → Gweedore 121 km
- Gweedore → Londonderry County Borough 139 km
- Londonderry County Borough → Cookstown 112 km
- Cookstown → Belfast 96 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.