EuroVelo 12 - North Sea Cycle Route - part Norway, stage 10: near Porsgrunn → Tønsberg
On stage 10 (near Porsgrunn → Tønsberg, 110 km) the best month is June: 76% of days were dry with highs of 10–30 °C, and riding near Porsgrunn → Tønsberg meant an average tailwind of 2.3 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 | 0% | 27% | 102 | 1 °C | 0% | 100% | 6.9 † |
| February | 0% | 24% | 76 | 2 °C | 0% | 100% | 9.1 † |
| March | 7% | 18% | 65 | 5 °C | 0% | 93% | 11.6 |
| April | 39% | 16% | 49 | 9 °C | 0% | 59% | 14.4 |
| May | 72% | 21% | 70 | 14 °C | 0% | 11% | 16.9 |
| June | 76% | 24% | 81 | 18 °C | 0% | 0% | 18.5 |
| July | 73% | 26% | 100 | 20 °C | 0% | 0% | 17.8 |
| August | 70% | 30% | 112 | 19 °C | 0% | 0% | 15.5 |
| September | 74% | 26% | 120 | 16 °C | 0% | 1% | 12.7 |
| October | 47% | 29% | 126 | 11 °C | 0% | 36% | 10.0 † |
| November | 9% | 31% | 119 | 6 °C | 0% | 86% | 7.5 † |
| December | 1% | 29% | 101 | 3 °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 near Porsgrunn → Tønsberg, km/h | Headwind > 15 km/h, near Porsgrunn → Tønsberg | Headwind > 15 km/h, Tønsberg → near Porsgrunn | Better way |
|---|---|---|---|---|
| January | +1.7 | 12% | 17% | either |
| February | +1.3 | 10% | 14% | either |
| March | +1.3 | 9% | 12% | either |
| April | +0.6 | 6% | 10% | either |
| May | +0.7 | 5% | 10% | either |
| June | +2.3 | 3% | 12% | near Porsgrunn → Tønsberg |
| July | +2.6 | 3% | 12% | near Porsgrunn → Tønsberg |
| August | +2.6 | 4% | 12% | near Porsgrunn → Tønsberg |
| September | +2.3 | 7% | 17% | near Porsgrunn → Tønsberg |
| October | +2.0 | 10% | 17% | either |
| November | +1.2 | 13% | 17% | either |
| December | +2.8 | 9% | 18% | near Porsgrunn → Tønsberg |
Along the route (sections of about 25 km)
| km | Heading | Tailwind in June, km/h |
|---|---|---|
| 1,030–1,056 | E | −0.8 |
| 1,056–1,081 | E | −0.7 |
| 1,081–1,106 | NE | +5.3 |
| 1,106–1,132 | NE | +6.0 |
| 1,132–1,140 | E | +0.7 |
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.