Cluj County · Romania · 46.77° N · 23.60° E
Solar position in Cluj-Napoca
Sun position, daylight and the best solar panel angle for Cluj-Napoca — computed for 46.77° N, 23.60° E, 352 m above sea level.
The sun right now
Sun in Cluj-Napoca today
Sunday, 25 October 2026 · local time UTC+3
| Event | Time | Direction / height |
|---|---|---|
| Astronomical dawn | 05:15 | sun 18° below horizon |
| Nautical dawn | 05:50 | 12° below |
| Civil dawn | 06:26 | 6° below |
| Sunrise | 06:57 | 107° ESE |
| Golden hour ends | 07:40 | sun 6° up |
| Solar noon | 12:09 | 31.1° high |
| Golden hour starts | 16:38 | sun 6° up |
| Sunset | 17:21 | 253° WSW |
| Civil dusk | 17:52 | 6° below |
| Nautical dusk | 18:27 | 12° below |
| Astronomical dusk | 19:02 | 18° below |
| Day length | 10 h 24 min | |
Sun path diagram for Cluj-Napoca
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 66.7° at solar noon in Cluj-Napoca; on the December solstice only 19.8°. Sunrise swings from 53° NE in June to 124° SE in December — a 71° 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 | 08:01 | 12:37 | 17:12 | 9 h 11 min | 23.4° |
| February | 07:19 | 12:39 | 17:59 | 10 h 39 min | 32.8° |
| March | 06:27 | 12:33 | 18:39 | 12 h 12 min | 43.6° |
| April | 06:27 | 13:24 | 20:21 | 13 h 54 min | 55.2° |
| May | 05:44 | 13:22 | 21:00 | 15 h 16 min | 63.5° |
| June | 05:31 | 13:27 | 21:23 | 15 h 52 min | 66.7° |
| July | 05:52 | 13:31 | 21:10 | 15 h 18 min | 63.7° |
| August | 06:30 | 13:28 | 20:25 | 13 h 55 min | 55.3° |
| September | 07:10 | 13:18 | 19:25 | 12 h 15 min | 43.9° |
| October | 07:51 | 13:09 | 18:28 | 10 h 37 min | 32.5° |
| November | 07:36 | 12:11 | 16:45 | 9 h 09 min | 23.3° |
| December | 08:07 | 12:23 | 16:39 | 8 h 32 min | 19.8° |
A year of daylight in Cluj-Napoca
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 Cluj-Napoca
Fixed array facing south (azimuth 180°). Energy per kWp from NASA POWER monthly climate, including clouds, temperature and snow reflection.
37°collects the most energy over a year: 1261 kWh per kWp.
71°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° | 1048 | 83% | 0.74 | 6.5× |
| 15° | 1184 | 94% | 1.10 | 4.5× |
| 30° | 1253 | 99% | 1.40 | 3.4× |
| 37° year-round best | 1261 | 100% | 1.51 | 3.1× |
| 45° | 1252 | 99% | 1.62 | 2.8× |
| 47° = latitude | 1246 | 99% | 1.64 | 2.7× |
| 60° | 1181 | 94% | 1.74 | 2.3× |
| 70° | 1098 | 87% | 1.77 | 2.1× |
| 71° off-grid best | 1088 | 86% | 1.77 | 2.0× |
| 90° | 859 | 68% | 1.68 | 1.6× |
A fixed array in Cluj-Napoca produces the most over a year at 37°. The design month for an off-grid system is December: at 71° it makes 1.77 kWh per kWp a day, 17% more than at 37°, and costs 14% of the yearly total. Why steep panels win winter.
Off-grid solar in Cluj-Napoca at 70°
Daily energy of 1 kWp by month. Bars: panels at 70°. Line: panels at 37° (year-round best).
| Month | Sun hours, flat | Sun hours at 70° | kWh/kWp/day at 70° | at 37° | Mean temp. |
|---|---|---|---|---|---|
| January snow | 1.19 | 2.39 | 2.17 | 1.85 | -3.2 °C |
| February snow | 1.98 | 3.02 | 2.73 | 2.59 | -1.3 °C |
| March | 3.18 | 3.78 | 3.36 | 3.59 | 3.5 °C |
| April | 4.48 | 4.06 | 3.52 | 4.27 | 9.5 °C |
| May | 5.35 | 3.91 | 3.32 | 4.47 | 14.7 °C |
| June | 5.91 | 3.87 | 3.23 | 4.62 | 18.7 °C |
| July | 5.89 | 4.01 | 3.32 | 4.67 | 20.8 °C |
| August | 5.35 | 4.41 | 3.66 | 4.68 | 21.0 °C |
| September | 3.79 | 4.10 | 3.48 | 3.89 | 15.7 °C |
| October | 2.52 | 3.68 | 3.20 | 3.17 | 9.7 °C |
| November | 1.42 | 2.61 | 2.31 | 2.10 | 4.2 °C |
| December snow | 0.94 | 1.97 | 1.77 | 1.51 | -1.7 °C |
| Year | 3.51 avg | 3.49 avg | 1098 kWh | 1261 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 670 Wp of panels at 70°, versus 780 Wp at 37°. The steep array is 15% smaller for the same winter. Size your own system.
Row spacing in Cluj-Napoca
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.
7.0 mrow pitch at 70°
5.6 mrow pitch at 37°
How Cluj-Napoca compares in Romania
Against the other 125 places in Romania with climate data, for a fixed array at its best angle.
106thof 126 places in Romania for sunshine, shared: 3.51 peak sun hours a day on flat ground.
−3%solar energy a year compared with the average place in Romania: 1,261 against 1,300 kWh per kWp.
+19 mindaylight on the longest day, compared with Bucharest: 15 h 52 min against 15 h 33 min.
37°best year-round tilt here; across Romania it runs from 33° in Mangalia to 39° in Bistriţa.
Of the 126 places in Romania, Mangalia gets the most sun (3.93 peak sun hours a day) and Vişeu de Sus and one other place the least (3.33); Cluj-Napoca ranks joint 106th. In its darkest month, December, 1 kWp of off-grid panels at 70° makes 1.77 kWh a day here, against 2.01 kWh on average in Romania. The shortest day lasts 8 h 32 min, −18 min compared with Bucharest.
Solar forecast for Cluj-Napoca, 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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A free, live card for Cluj-Napoca: 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.