Nasjonal sykkelrute 1 Etappe 6, stage 4: Larvik → Moss
On stage 4 (Larvik → Moss, 93 km) the best month is September: 74% of days were dry with highs of 10–30 °C, and riding Larvik → Moss meant an average tailwind of 3.8 km/h (ERA5 2006–2025, 9:00–18:00).
← Nasjonal sykkelrute 1 Etappe 6 (Whole route)
Weather by month
| Month | Good days | Rain days ≥ 1 mm | Rain, mm | Avg high | Days ≥ 30 °C | Days < 10 °C | Daylight, h |
|---|---|---|---|---|---|---|---|
| January | 0% | 26% | 95 | 1 °C | 0% | 100% | 6.9 † |
| February | 0% | 23% | 73 | 1 °C | 0% | 100% | 9.1 † |
| March | 9% | 17% | 63 | 5 °C | 0% | 91% | 11.6 |
| April | 45% | 17% | 48 | 10 °C | 0% | 52% | 14.4 |
| May | 72% | 22% | 71 | 15 °C | 0% | 8% | 16.9 |
| June | 73% | 27% | 85 | 19 °C | 0% | 0% | 18.5 |
| July | 70% | 30% | 106 | 21 °C | 1% | 0% | 17.8 |
| August | 68% | 32% | 111 | 19 °C | 0% | 0% | 15.5 |
| September | 74% | 26% | 115 | 16 °C | 0% | 1% | 12.7 |
| October | 45% | 27% | 118 | 11 °C | 0% | 40% | 10.0 † |
| November | 9% | 30% | 108 | 6 °C | 0% | 87% | 7.5 † |
| December | 1% | 27% | 94 | 2 °C | 0% | 99% | 6.2 † |
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 Larvik → Moss, km/h | Headwind > 15 km/h, Larvik → Moss | Headwind > 15 km/h, Moss → Larvik | Better way |
|---|---|---|---|---|
| January | +1.1 | 11% | 17% | either |
| February | +1.4 | 11% | 16% | either |
| March | +1.7 | 9% | 15% | either |
| April | +1.2 | 8% | 12% | either |
| May | +2.9 | 7% | 15% | Larvik → Moss |
| June | +5.2 | 4% | 17% | Larvik → Moss |
| July | +5.6 | 3% | 18% | Larvik → Moss |
| August | +5.2 | 4% | 19% | Larvik → Moss |
| September | +3.8 | 6% | 20% | Larvik → Moss |
| October | +2.6 | 10% | 20% | Larvik → Moss |
| November | +0.9 | 14% | 18% | either |
| December | +2.2 | 7% | 20% | Larvik → Moss |
Along the route (sections of about 25 km)
| km | Heading | Tailwind in September, km/h |
|---|---|---|
| 376–401 | NE | +3.9 |
| 401–427 | NE | +4.3 |
| 427–452 | N | +4.3 |
| 452–469 | NE | +2.3 |
Other stages
- Spangereid → Birkeland 116 km
- Birkeland → Risør 120 km
- Risør → Larvik 141 km
- Larvik → Moss 93 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.