EuroVelo 12 - North Sea Cycle Route - part Norway, stage 9: Tvedestrand → near Porsgrunn
On stage 9 (Tvedestrand → near Porsgrunn, 116 km) the best month is June: 76% of days were dry with highs of 10–30 °C, and riding Tvedestrand → near Porsgrunn meant an average tailwind of 4.4 km/h (ERA5 2006–2025, 9:00–18:00).
← EuroVelo 12 - North Sea Cycle Route - part Norway (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% | 29% | 114 | 2 °C | 0% | 100% | 7.0 † |
| February | 1% | 25% | 83 | 2 °C | 0% | 99% | 9.2 † |
| March | 7% | 19% | 70 | 5 °C | 0% | 93% | 11.6 |
| April | 38% | 17% | 51 | 9 °C | 0% | 59% | 14.3 |
| May | 72% | 22% | 73 | 14 °C | 0% | 11% | 16.8 |
| June | 76% | 24% | 81 | 18 °C | 0% | 0% | 18.4 |
| July | 72% | 28% | 98 | 20 °C | 0% | 0% | 17.7 |
| August | 70% | 30% | 118 | 19 °C | 0% | 0% | 15.4 |
| September | 73% | 27% | 124 | 16 °C | 0% | 0% | 12.7 |
| October | 48% | 30% | 129 | 11 °C | 0% | 33% | 10.1 † |
| November | 10% | 31% | 129 | 6 °C | 0% | 85% | 7.6 † |
| December | 1% | 30% | 112 | 3 °C | 0% | 98% | 6.3 † |
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 Tvedestrand → near Porsgrunn, km/h | Headwind > 15 km/h, Tvedestrand → near Porsgrunn | Headwind > 15 km/h, near Porsgrunn → Tvedestrand | Better way |
|---|---|---|---|---|
| January | +1.2 | 15% | 20% | either |
| February | +1.1 | 15% | 18% | either |
| March | +1.3 | 13% | 16% | either |
| April | +1.0 | 10% | 12% | either |
| May | +2.2 | 8% | 14% | Tvedestrand → near Porsgrunn |
| June | +4.4 | 4% | 16% | Tvedestrand → near Porsgrunn |
| July | +4.8 | 4% | 16% | Tvedestrand → near Porsgrunn |
| August | +4.8 | 5% | 19% | Tvedestrand → near Porsgrunn |
| September | +3.4 | 9% | 21% | Tvedestrand → near Porsgrunn |
| October | +2.5 | 13% | 22% | Tvedestrand → near Porsgrunn |
| November | +0.7 | 19% | 20% | either |
| December | +2.5 | 12% | 23% | Tvedestrand → near Porsgrunn |
Along the route (sections of about 25 km)
| km | Heading | Tailwind in June, km/h |
|---|---|---|
| 914–939 | NE | +3.0 |
| 939–964 | NE | +4.3 |
| 964–990 | N | +5.1 |
| 990–1,015 | NE | +3.7 |
| 1,015–1,030 | N | +7.2 |
Other stages
- Bergen → Leirvik 110 km
- Leirvik → near Haugesund 116 km
- near Haugesund → Jørpeland 115 km
- Jørpeland → Kleppe 113 km
- Kleppe → Flekkefjord 128 km
- Flekkefjord → Lyngdal 114 km
- Lyngdal → Kristiansand 104 km
- Kristiansand → Tvedestrand 116 km
- Tvedestrand → near Porsgrunn 116 km
- near Porsgrunn → Tønsberg 110 km
- Tønsberg → near Halden 132 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.