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Solar data for Greece

Across the 117 places in Greece the best fixed tilt for solar panels runs from 27° in Irákleion to 34° in Sérres, and flat ground gets 4.2 to 5.2 peak sun hours a day. Every number is computed for each place.

Solar power in Greece at a glance

Averages over 117 places with climate data, for a fixed array facing south.

Best panel angle30°average, facing south
Peak sun hours4.58a day on flat ground
1 kWp makes1,533kWh a year at the best angle
Off-grid angle62°average, for the darkest month
AthensRódos (most sun)
  • 4.18–4.38
  • 4.38–4.57
  • 4.57–4.77
  • 4.77–4.97
  • 4.97–5.17

Peak sun hours a day on flat ground. Each dot is one place.

The sunniest place in Greece is Ródos (South Aegean) with 5.17 peak sun hours a day on flat ground; the least sunny is Dráma with 4.18. A 1 kWp array at its best angle makes from 1,433 kWh a year in Orestiáda to 1,715 kWh in Ródos — 1,533 kWh on average.

The best year-round tilt runs from 27° in Irákleion to 34° in Sérres. Off-grid systems are sized for the darkest month and do better steeper, at 62° on average: at 70° that month brings 2.33 kWh per kWp a day in Orestiáda and 3.15 kWh in Kos.

Size an off-grid system or open any place below for its sun path, monthly table and tilt curve.

Sunniest places in Greece

Ranked by peak sun hours on flat ground: the yearly average of a day's sunshine energy (NASA POWER climatology). Output: 1 kWp at its best year-round angle.

RankPlaceRegionSun hours/daykWh per kWp a yearBest tilt
1RódosSouth Aegean5.171,71530°
2KosSouth Aegean5.111,69730°
3IrákleionCrete5.001,62527°
4ChaniáCrete4.981,61627°
4RethymnoCrete4.981,61327°
6PýrgosWest Greece4.891,63330°
7AmaliádaWest Greece4.861,62430°
7ChiosNorth Aegean4.861,61730°
7KalamataPeloponnese4.861,61529°
10SpartaPeloponnese4.801,60330°

Least sunny places in Greece

RankPlaceRegionSun hours/daykWh per kWp a yearBest tilt
113FlórinaWest Macedonia4.221,46633°
113XánthiEast Macedonia and Thrace4.221,45733°
115OrestiádaEast Macedonia and Thrace4.201,43332°
116SérresCentral Macedonia4.191,45334°
117DrámaEast Macedonia and Thrace4.181,45334°

Solar by region in Greece

Averages of the places in each region, sunniest first. Darkest month: what 1 kWp of off-grid panels at 70° makes a day in the worst month of the year.

RegionPlacesSun hours/daykWh per kWp a yearBest tiltDarkest month at 70°Sunniest place
South Aegean25.141,70630°3.12 kWhRódos
Crete34.991,61827°2.74 kWhIrákleion
North Aegean24.801,60531°2.69 kWhChios
West Greece54.751,59731°2.95 kWhPýrgos
Peloponnese54.741,58230°2.91 kWhKalamata
Attica564.691,54929°2.55 kWhVári
Ionian Islands14.591,54932°2.79 kWhCorfu
Epirus34.541,53932°2.88 kWhPréveza
Central Greece44.531,51230°2.57 kWhThívai
Thessaly54.391,48432°2.65 kWhNéa Ionía
Central Macedonia224.281,47133°2.69 kWhKateríni
West Macedonia34.261,47533°2.75 kWhKozáni
East Macedonia and Thrace64.241,45933°2.48 kWhAlexandroupoli

Largest places in Greece at a glance

PlaceLatitudeBest tiltOff-grid tiltSun hours/day (flat)
Athens38.0° N29°61°4.69
Thessaloníki40.6° N33°64°4.29
Pátra38.2° N31°63°4.71
Piraeus37.9° N29°61°4.71
Lárisa39.6° N32°63°4.38
Peristéri38.0° N29°61°4.68
Irákleion35.3° N27°58°5.00
Kallithéa38.0° N29°61°4.70
Acharnés38.1° N29°61°4.66
Kalamariá40.6° N33°64°4.29
Níkaia38.0° N29°61°4.70
Glyfáda37.9° N29°61°4.73
Volos39.4° N31°63°4.42
Ílion38.0° N29°61°4.68
Ilioúpoli37.9° N29°61°4.71
Keratsíni38.0° N29°61°4.70
Évosmos40.7° N33°64°4.28
Khalándrion38.0° N29°61°4.68
Néa Smýrni37.9° N29°61°4.70
Maroúsi38.1° N29°61°4.67

Daylight and clock time in Greece

In Orestiáda (41.5° N), the northernmost place, the longest day of the year lasts 15 h 11 min and the shortest 9 h 10 min; in Irákleion (35.3° N), the southernmost, 14 h 33 min and 9 h 46 min. The clocks change twice a year: forward on Sun 29 Mar, back on Sun 25 Oct (Europe/Athens).

Time zonePlacesUTC offsetClocks change in 2026
Europe/Athens117UTC+2, in summer UTC+3Forward on Sun 29 Mar, back on Sun 25 Oct

Questions about solar in Greece

What is the best angle for solar panels in Greece?
Facing south, between 27° and 34° depending on the place — 30° on average over 117 places. Off-grid systems that must get through the darkest month do better steeper, at about 62° on average.
How many peak sun hours does Greece get?
From 4.2 hours a day in Dráma to 5.2 in Ródos on flat ground, averaged over the year; 4.6 on average.
How much electricity does 1 kWp of solar panels produce in Greece?
About 1,533 kWh a year at the best fixed angle on average, from 1,433 kWh in Orestiáda to 1,715 kWh in Ródos. These are long-term climate averages; a single year can be several per cent higher or lower.
Where is the sunniest place in Greece?
Ródos (South Aegean) gets the most sun of the 117 places: 5.17 peak sun hours a day on flat ground, so 1 kWp there makes about 1,715 kWh a year.
Does Greece use daylight saving time?
The clocks change twice a year: forward on Sun 29 Mar, back on Sun 25 Oct (Europe/Athens).
How long is the longest day in Greece?
15 h 11 min in Orestiáda; the shortest day lasts 9 h 10 min in Orestiáda.

All places in Greece

Ionian Islands

North Aegean

South Aegean