Solarposition.org

Coimbra · Portugal · 40.21° N · 8.48° W

Solar position in Ribeira de Frades

Sun position, daylight and the best solar panel angle for Ribeira de Frades — computed for 40.21° N, 8.48° W, 27 m above sea level.

Sunrise today07:54105° ESE
Sunset today18:41255° WSW
Best panel angle33°year-round, facing south
Off-grid angle65°best for the darkest month

The sun right now

Azimuth180.0°
Elevation38.0°
At solar noon, 13:17Open on the sun map

Sun in Ribeira de Frades today

Saturday, 24 October 2026 · local time UTC+1

EventTimeDirection / height
Astronomical dawn06:23sun 18° below horizon
Nautical dawn06:5412° below
Civil dawn07:266° below
Sunrise07:54105° ESE
Golden hour ends08:31sun 6° up
Solar noon13:1738.0° high
Golden hour starts18:03sun 6° up
Sunset18:41255° WSW
Civil dusk19:096° below
Nautical dusk19:4012° below
Astronomical dusk20:1218° below
Day length10 h 47 min

Sun path diagram for Ribeira de Frades

Where the sun stands in the sky: the centre is straight overhead, the outer ring is the horizon. Numbers mark local clock hours.

15°30°45°60°75°N30°60°E120°150°S210°240°W300°330°June solstice7891011121314151617181920EquinoxDecember solstice91011121314151617Today
  • June solstice
  • Equinox
  • December solstice
  • Today

On the June solstice the sun reaches 73.2° at solar noon in Ribeira de Frades; on the December solstice only 26.4°. Sunrise swings from 58° ENE in June to 121° ESE in December — a 63° 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.

MonthSunriseSolar noonSunsetDay lengthNoon elevation
January07:5112:4517:399 h 48 min30.0°
February07:1912:4718:1610 h 57 min39.4°
March06:3512:4118:4612 h 11 min50.2°
April06:4713:3220:1813 h 32 min61.8°
May06:1313:3020:4814 h 35 min70.1°
June06:0413:3521:0615 h 02 min73.2°
July06:2113:4020:5814 h 36 min70.2°
August06:5013:3620:2213 h 32 min61.8°
September07:2013:2619:3212 h 12 min50.4°
October07:5013:1818:4510 h 55 min39.0°
November07:2612:1917:129 h 47 min29.8°
December07:5212:3117:119 h 18 min26.4°

A year of daylight in Ribeira de Frades

Each column is one day of 2026. Bright: sun above the horizon; soft: civil twilight; line: solar noon. Steps are daylight saving time changes.

00:0003:0006:0009:0012:0015:0018:0021:0000:00JanFebMarAprMayJunJulAugSepOctNovDec

Best solar panel angle in Ribeira de Frades

Fixed array facing south (azimuth 180°). Energy per kWp from NASA POWER monthly climate, including clouds, temperature and snow reflection.

33°collects the most energy over a year: 1584 kWh per kWp.

65°gives the most in the darkest month — the one an off-grid system is sized for.

40%50%60%70%80%90%100%0°10°20°30°40°50°60°70°80°90°Best year-round 33°Best worst-month 65°70°Yearly energyWorst-month energy
  • Yearly energy
  • Worst-month energy
TiltkWh/kWp per yearShare of best yearDecember kWh/kWp/dayBest ÷ worst month
0°135485%1.474.0×
15°151396%2.132.8×
30°1582100%2.662.1×
33° year-round best1584100%2.742.0×
40° = latitude157599%2.921.8×
45°155798%3.011.7×
60°144191%3.181.5×
65° off-grid best138487%3.191.4×
70°131883%3.181.3×
90°98262%2.901.8×

A fixed array in Ribeira de Frades produces the most over a year at 33°. The design month for an off-grid system is December: at 65° it makes 3.19 kWh per kWp a day, 16% more than at 33°, and costs 13% of the yearly total. Why steep panels win winter.

Off-grid solar in Ribeira de Frades at 70°

Daily energy of 1 kWp by month. Bars: panels at 70°. Line: panels at 33° (year-round best).

0123456January: 3.23 (70°)3.2JanFebruary: 3.88 (70°)3.9FebMarch: 3.89 (70°)3.9MarApril: 3.76 (70°)3.8AprMay: 3.50 (70°)3.5MayJune: 3.24 (70°)3.2JunJuly: 3.43 (70°)3.4JulAugust: 3.92 (70°)3.9AugSeptember: 4.25 (70°)4.3SepOctober: 3.75 (70°)3.7OctNovember: 3.33 (70°)3.3NovDecember: 3.18 (70°)3.2Dec33°
MonthSun hours, flatSun hours at 70°kWh/kWp/day at 70°at 33°Mean temp.
January2.033.693.232.878.5 °C
February3.054.453.883.789.1 °C
March4.104.493.894.3211.2 °C
April5.384.393.764.8813.3 °C
May6.544.153.505.2916.3 °C
June7.033.893.245.3119.6 °C
July7.264.153.435.5321.6 °C
August6.554.733.925.4922.1 °C
September5.115.094.254.9820.3 °C
October3.384.423.753.8316.5 °C
November2.283.853.333.0411.5 °C
December1.863.633.182.749.0 °C
Year4.56 avg4.24 avg1318 kWh1584 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 370 Wp of panels at 70°, versus 430 Wp at 33°. The steep array is 14% smaller for the same winter. Size your own system.

Row spacing in Ribeira de Frades

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.

5.1 mrow pitch at 70°

4.2 mrow pitch at 33°

Row spacing calculator

How Ribeira de Frades compares in Portugal

Against the other 173 places in Portugal with climate data, for a fixed array at its best angle.

106thof 174 places in Portugal for sunshine, shared: 4.56 peak sun hours a day on flat ground.

−1%solar energy a year compared with the average place in Portugal: 1,584 against 1,604 kWh per kWp.

+10 mindaylight on the longest day, compared with Lisbon: 15 h 02 min against 14 h 53 min.

33°best year-round tilt here; across Portugal it runs from 26° in Funchal to 34° in Porto.

Of the 174 places in Portugal, Faro and one other place get the most sun (5.10 peak sun hours a day) and Monção the least (4.21); Ribeira de Frades ranks joint 106th. In its darkest month, December, 1 kWp of off-grid panels at 70° makes 3.18 kWh a day here, against 3.10 kWh on average in Portugal. The shortest day lasts 9 h 18 min, −9 min compared with Lisbon.

The sunniest places in Portugal

Solar forecast for Ribeira de Frades, next 48 hours

Expected output of 1 kWp at 70°, computed from the ICON-EU weather model of the Deutscher Wetterdienst (DWD), Europe.

Loading the latest forecast…

Questions about the sun in Ribeira de Frades

What is the best solar panel angle in Ribeira de Frades?
For a fixed array facing south, the best year-round tilt in Ribeira de Frades is 33°, worth about 1584 kWh per kWp a year. An off-grid system that has to get through December does better at about 65°.
What time is sunrise and sunset in Ribeira de Frades today?
On 24 October 2026 the sun rises at 07:54 and sets at 18:41 local time (UTC+1), giving 10 h 47 min of daylight. Solar noon is at 13:17.
How many peak sun hours does Ribeira de Frades get?
On a flat surface 4.6 hours a day averaged over the year, from 1.9 in December to 7.3 in July. Panels tilted at 70° receive 3.6 sun hours a day in December.
How high does the sun get in Ribeira de Frades?
At solar noon the sun stands 73.2° above the horizon on the June solstice and 26.4° on the December solstice.
Is Ribeira de Frades a good place for solar panels?
With 4.6 peak sun hours a day on flat ground, Ribeira de Frades ranks joint 106th of 174 places in Portugal for sunshine. A 1 kWp array at the best angle (33°) makes about 1,584 kWh a year here, 1% less than the average place in Portugal.

Places near Ribeira de Frades

All places in Portugal

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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.