Lazio · Italy · 42.42° N · 12.11° E
Solar position in Viterbo
Sun position, daylight and the best solar panel angle for Viterbo — computed for 42.42° N, 12.11° E, 326 m above sea level.
The sun right now
Sun in Viterbo today
Saturday, 24 October 2026 · local time UTC+2
| Event | Time | Direction / height |
|---|---|---|
| Astronomical dawn | 06:00 | sun 18° below horizon |
| Nautical dawn | 06:33 | 12° below |
| Civil dawn | 07:06 | 6° below |
| Sunrise | 07:35 | 105° ESE |
| Golden hour ends | 08:14 | sun 6° up |
| Solar noon | 12:55 | 35.8° high |
| Golden hour starts | 17:36 | sun 6° up |
| Sunset | 18:15 | 255° WSW |
| Civil dusk | 18:44 | 6° below |
| Nautical dusk | 19:17 | 12° below |
| Astronomical dusk | 19:50 | 18° below |
| Day length | 10 h 41 min | |
Sun path diagram for Viterbo
Where the sun stands in the sky: the centre is straight overhead, the outer ring is the horizon. Numbers mark local clock hours.
- June solstice
- Equinox
- December solstice
- Today
On the June solstice the sun reaches 71.0° at solar noon in Viterbo; on the December solstice only 24.2°. Sunrise swings from 56° ENE in June to 122° ESE in December — a 65° arc along the horizon.
Sunrise, sunset and sun height by month
Values for the 21st of each month, local clock time including daylight saving time.
| Month | Sunrise | Solar noon | Sunset | Day length | Noon elevation |
|---|---|---|---|---|---|
| January | 07:34 | 12:23 | 17:11 | 9 h 36 min | 27.8° |
| February | 06:59 | 12:25 | 17:51 | 10 h 52 min | 37.1° |
| March | 06:13 | 12:18 | 18:24 | 12 h 11 min | 47.9° |
| April | 06:21 | 13:10 | 19:59 | 13 h 38 min | 59.5° |
| May | 05:44 | 13:08 | 20:32 | 14 h 48 min | 67.8° |
| June | 05:34 | 13:13 | 20:52 | 15 h 18 min | 71.0° |
| July | 05:53 | 13:17 | 20:42 | 14 h 49 min | 68.0° |
| August | 06:24 | 13:14 | 20:03 | 13 h 39 min | 59.6° |
| September | 06:57 | 13:04 | 19:10 | 12 h 13 min | 48.2° |
| October | 07:31 | 12:55 | 18:20 | 10 h 49 min | 36.8° |
| November | 07:09 | 11:57 | 16:44 | 9 h 35 min | 27.6° |
| December | 07:37 | 12:09 | 16:41 | 9 h 04 min | 24.2° |
A year of daylight in Viterbo
Each column is one day of 2026. Bright: sun above the horizon; soft: civil twilight; line: solar noon. Steps are daylight saving time changes.
Best solar panel angle in Viterbo
Fixed array facing south (azimuth 180°). Energy per kWp from NASA POWER monthly climate, including clouds, temperature and snow reflection.
34°collects the most energy over a year: 1501 kWh per kWp.
66°gives the most in the darkest month — the one an off-grid system is sized for.
- Yearly energy
- Worst-month energy
| Tilt | kWh/kWp per year | Share of best year | December kWh/kWp/day | Best ÷ worst month |
|---|---|---|---|---|
| 0° | 1275 | 85% | 1.20 | 4.9× |
| 15° | 1428 | 95% | 1.79 | 3.3× |
| 30° | 1497 | 100% | 2.26 | 2.5× |
| 34° year-round best | 1501 | 100% | 2.36 | 2.3× |
| 42° = latitude | 1490 | 99% | 2.54 | 2.1× |
| 45° | 1479 | 99% | 2.59 | 2.0× |
| 60° | 1376 | 92% | 2.75 | 1.6× |
| 66° off-grid best | 1312 | 87% | 2.77 | 1.5× |
| 70° | 1263 | 84% | 2.76 | 1.4× |
| 90° | 952 | 63% | 2.55 | 1.6× |
A fixed array in Viterbo produces the most over a year at 34°. The design month for an off-grid system is December: at 66° it makes 2.77 kWh per kWp a day, 17% more than at 34°, and costs 13% of the yearly total. Why steep panels win winter.
Off-grid solar in Viterbo at 70°
Daily energy of 1 kWp by month. Bars: panels at 70°. Line: panels at 34° (year-round best).
| Month | Sun hours, flat | Sun hours at 70° | kWh/kWp/day at 70° | at 34° | Mean temp. |
|---|---|---|---|---|---|
| January | 1.74 | 3.26 | 2.87 | 2.53 | 6.7 °C |
| February | 2.64 | 3.94 | 3.47 | 3.35 | 7.2 °C |
| March | 3.84 | 4.32 | 3.76 | 4.11 | 9.8 °C |
| April | 5.14 | 4.34 | 3.72 | 4.71 | 13.1 °C |
| May | 6.20 | 4.17 | 3.51 | 5.06 | 17.1 °C |
| June | 7.12 | 4.14 | 3.41 | 5.37 | 21.9 °C |
| July | 7.32 | 4.39 | 3.59 | 5.55 | 25.1 °C |
| August | 6.37 | 4.83 | 3.95 | 5.36 | 25.1 °C |
| September | 4.68 | 4.79 | 4.00 | 4.60 | 20.6 °C |
| October | 3.17 | 4.29 | 3.64 | 3.67 | 16.5 °C |
| November | 1.93 | 3.30 | 2.85 | 2.60 | 11.9 °C |
| December | 1.53 | 3.15 | 2.76 | 2.36 | 7.9 °C |
| Year | 4.32 avg | 4.08 avg | 1263 kWh | 1501 kWh |
Sizing example. To run a 1 kWh-per-day load through December on LiFePO4 batteries (charge controller, battery and inverter losses included) you need about 430 Wp of panels at 70°, versus 500 Wp at 34°. The steep array is 14% smaller for the same winter. Size your own system.
Row spacing in Viterbo
Distance between rows of 2 m long panels (slope length) so that no row shades the next between 10:00 and 14:00 solar time on the winter solstice.
5.6 mrow pitch at 70°
4.6 mrow pitch at 34°
How Viterbo compares in Italy
Against the other 596 places in Italy with climate data, for a fixed array at its best angle.
261stof 597 places in Italy for sunshine, shared: 4.32 peak sun hours a day on flat ground.
+3%solar energy a year compared with the average place in Italy: 1,501 against 1,452 kWh per kWp.
+4 mindaylight on the longest day, compared with Rome: 15 h 18 min against 15 h 14 min.
34°best year-round tilt here; across Italy it runs from 30° in Palermo to 42° in Bolzano.
Of the 597 places in Italy, Pozzallo and one other place get the most sun (4.91 peak sun hours a day) and Bressanone the least (3.51); Viterbo ranks joint 261st. In its darkest month, December, 1 kWp of off-grid panels at 70° makes 2.76 kWh a day here, against 2.63 kWh on average in Italy. The shortest day lasts 9 h 04 min, −3 min compared with Rome.
Solar forecast for Viterbo, next 48 hours
Expected output of 1 kWp at 70°, computed from the ICON-EU weather model of the Deutscher Wetterdienst (DWD), Europe.
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Questions about the sun in Viterbo
What is the best solar panel angle in Viterbo?
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Places near Viterbo
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A free, live card for Viterbo: where the sun is right now on today's path, a countdown to sunset or sunrise, the daylight change, the moon phase at night and the best panel angle.
Sun positions: NREL Solar Position Algorithm. Climate: NASA POWER monthly climatology (NASA Langley Research Center). Forecast: Deutscher Wetterdienst, ICON-EU (CC BY 4.0), processed. Places: GeoNames (CC BY 4.0). Time zones: IANA. Sources and licences.