EuroVelo 1 - Atlantic Coast Route - part Ireland, stage 20: Londonderry County Borough → Cookstown
On stage 20 (Londonderry County Borough → Cookstown, 112 km) the best month is September: 65% of days were dry with highs of 10–30 °C; the wind barely favours either direction (0.4 km/h on average; 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 | 10% | 30% | 87 | 7 °C | 0% | 83% | 7.8 † |
| February | 15% | 33% | 80 | 8 °C | 0% | 79% | 9.6 † |
| March | 26% | 38% | 79 | 9 °C | 0% | 63% | 11.7 |
| April | 52% | 35% | 69 | 12 °C | 0% | 30% | 14.0 |
| May | 60% | 38% | 83 | 14 °C | 0% | 7% | 16.1 |
| June | 63% | 37% | 88 | 17 °C | 0% | 0% | 17.3 |
| July | 60% | 40% | 104 | 18 °C | 0% | 0% | 16.8 |
| August | 58% | 42% | 108 | 17 °C | 0% | 0% | 14.9 |
| September | 65% | 35% | 81 | 16 °C | 0% | 0% | 12.6 |
| October | 60% | 34% | 96 | 13 °C | 0% | 9% | 10.3 † |
| November | 28% | 30% | 92 | 9 °C | 0% | 57% | 8.3 † |
| December | 12% | 33% | 92 | 7 °C | 0% | 76% | 7.2 † |
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 Londonderry County Borough → Cookstown, km/h | Headwind > 15 km/h, Londonderry County Borough → Cookstown | Headwind > 15 km/h, Cookstown → Londonderry County Borough | Better way |
|---|---|---|---|---|
| January | −0.5 | 13% | 11% | either |
| February | −1.4 | 17% | 11% | either |
| March | −0.3 | 14% | 13% | either |
| April | −0.5 | 13% | 11% | either |
| May | +0.1 | 12% | 11% | either |
| June | +1.0 | 8% | 10% | either |
| July | +1.6 | 7% | 10% | either |
| August | +1.4 | 9% | 12% | either |
| September | +0.4 | 11% | 11% | either |
| October | −1.5 | 14% | 9% | either |
| November | −0.3 | 12% | 10% | either |
| December | −0.9 | 13% | 10% | either |
Along the route (sections of about 25 km)
| km | Heading | Tailwind in September, km/h |
|---|---|---|
| 2,323–2,349 | SW | −6.5 |
| 2,349–2,374 | SE | −0.8 |
| 2,374–2,399 | E | +4.2 |
| 2,399–2,424 | SE | +2.9 |
| 2,424–2,436 | E | +3.7 |
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.