Nasjonal sykkelrute 1 (Terråk – Trondheim): which way and when to ride
The best month for Nasjonal sykkelrute 1 (Terråk – Trondheim) is July: 63% of days were dry with highs of 10–30 °C. In July the wind barely favours either direction — on average 0.0 km/h along the route (ERA5 2006–2025, daytime 9:00–18:00).
Weather by month
| Month | Good days | Rain days ≥ 1 mm | Rain, mm | Avg high | Days ≥ 30 °C | Days < 10 °C | Daylight, h |
|---|---|---|---|---|---|---|---|
| January | 0% | 39% | 124 | 0 °C | 0% | 100% | 5.3 † |
| February | 0% | 35% | 98 | 1 °C | 0% | 100% | 8.4 † |
| March | 3% | 40% | 128 | 4 °C | 0% | 96% | 11.5 |
| April | 22% | 39% | 94 | 8 °C | 0% | 76% | 15.0 |
| May | 48% | 39% | 82 | 13 °C | 0% | 36% | 18.4 |
| June | 61% | 36% | 98 | 16 °C | 0% | 8% | 21.1 |
| July | 63% | 35% | 95 | 19 °C | 2% | 0% | 19.8 |
| August | 61% | 39% | 121 | 18 °C | 0% | 1% | 16.4 |
| September | 55% | 42% | 144 | 14 °C | 0% | 11% | 12.9 |
| October | 17% | 43% | 144 | 8 °C | 0% | 72% | 9.5 † |
| November | 2% | 36% | 113 | 3 °C | 0% | 96% | 6.2 † |
| December | 0% | 37% | 125 | 1 °C | 0% | 100% | 4.1 † |
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 Terråk → Trondheim, km/h | Headwind > 15 km/h, near Terråk → Trondheim | Headwind > 15 km/h, Trondheim → near Terråk | Better way |
|---|---|---|---|---|
| January | −4.1 | 10% | 1% | Trondheim → near Terråk |
| February | −3.8 | 8% | 1% | Trondheim → near Terråk |
| March | −3.3 | 9% | 2% | Trondheim → near Terråk |
| April | −1.8 | 6% | 2% | either |
| May | −1.1 | 6% | 2% | either |
| June | +0.3 | 4% | 2% | either |
| July | 0.0 | 3% | 1% | either |
| August | −1.4 | 5% | 1% | either |
| September | −3.2 | 8% | 1% | Trondheim → near Terråk |
| October | −3.6 | 8% | 1% | Trondheim → near Terråk |
| November | −3.4 | 7% | 1% | Trondheim → near Terråk |
| December | −4.2 | 9% | 1% | Trondheim → near Terråk |
Along the route (sections of about 25 km)
| km | Heading | Tailwind in July, km/h |
|---|---|---|
| 0–25 | SW | −0.4 |
| 25–51 | SW | −0.3 |
| 51–76 | S | +0.8 |
| 76–101 | S | +1.2 |
| 101–126 | S | +1.3 |
| 126–152 | SW | −0.9 |
| 152–177 | SE | +0.6 |
| 177–203 | SE | +0.7 |
| 203–228 | SW | −0.9 |
| 228–254 | W | −1.4 |
| 254–279 | SW | −0.6 |
| 279–304 | SW | −0.9 |
| 304–320 | SE | +1.4 |
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.