Stargazing at Chelmos-Vouraikos National Park: when is the sky clear and dark?
August is the best month for stargazing at Chelmos-Vouraikos National Park: on average 96 clear, moonless hours of full darkness, and 60% of nights have at least two of them (ERA5, 2006–2025). The darkest spot we found there is darker than 62% of Europe’s land (NASA VIIRS 2025).
national park · Greece
Month by month
| Month | Nights with ≥ 2 such hours | Clear moonless dark hours | Moonless dark hours | Of them clear |
|---|---|---|---|---|
| January | 16% | 25 | 175 | 14% |
| February | 20% | 29 | 146 | 20% |
| March | 22% | 32 | 141 | 22% |
| April | 28% | 39 | 119 | 33% |
| May | 29% | 36 | 94 | 38% |
| June | 48% | 60 | 92 | 65% |
| July | 62% | 85 | 95 | 89% |
| August | 60% | 96 | 116 | 83% |
| September | 44% | 67 | 129 | 52% |
| October | 30% | 49 | 158 | 31% |
| November | 24% | 36 | 167 | 22% |
| December | 17% | 26 | 185 | 14% |
Climate, not a forecast: these are shares of past nights (ERA5 reanalysis, 2006–2025), not a prediction for a particular night. Check a forecast before you go.
Light pollution
| Darker than | 62% of Europe’s land |
|---|---|
| Light pollution | dark rural sky (darkest 20–50 %) |
| Sky-glow index (own, VIIRS) — Darkest spot we found | 1.97 |
| Sky-glow index (own, VIIRS) — at the official map point | 2.96 |
| Sky-glow index (own, VIIRS) — median across the area | 2.61 |
| Darkest spot we found | 37.958, 22.225 (map) — within 4.2 km of the Wikidata point (no OSM boundary) |
Next new moons
| New moon | Night | Moonless dark hours that night | Typical share of good nights that month |
|---|---|---|---|
| 9 November 2026 | 8–9 November 2026 | 10.7 | 24% |
| 9 December 2026 | 8–9 December 2026 | 11.3 | 17% |
| 7 January 2027 | 7–8 January 2027 | 11.2 | 16% |
| 6 February 2027 | 6–7 February 2027 | 10.7 | 20% |
| 8 March 2027 | 7–8 March 2027 | 9.5 | 22% |
| 6 April 2027 | 6–7 April 2027 | 8.2 | 28% |
| 6 May 2027 | 6–7 May 2027 | 6.7 | 29% |
| 4 June 2027 | 4–5 June 2027 | 5.5 | 48% |
| 4 July 2027 | 3–4 July 2027 | 5.3 | 62% |
| 2 August 2027 | 1–2 August 2027 | 6.5 | 60% |
| 31 August 2027 | 31 August 2027 – 1 September 2027 | 7.8 | 60% |
| 30 September 2027 | 29–30 September 2027 | 9.2 | 44% |
Hours with the Sun below −18° and the Moon below the horizon, on the night of the new moon, at the darkest spot.
Meteor showers
| Shower | Peak night | Chance of a clear peak night | Moon lit | Moonless dark hours (Sun < −12°) | Radiant max. height |
|---|---|---|---|---|---|
| Leonids | 17–18 November 2026 | 27% | 54% | 6.0 | 72° |
| Geminids * | 13–14 December 2026 | 32% | 20% | 9.5 | 85° |
| Geminids * | 14–15 December 2026 | 28% | 28% | 8.5 | 85° |
| Quadrantids | 3–4 January 2027 | 25% | 13% | 10.8 | 63° |
| Lyrids | 22–23 April 2027 | 43% | 95% | 1.2 | 86° |
| Eta Aquariids * | 5–6 May 2027 | 43% | 0% | 8.0 | 25° |
| Eta Aquariids * | 6–7 May 2027 | 47% | 0% | 8.0 | 25° |
| Perseids * | 12–13 August 2027 | 85% | 84% | 3.0 | 64° |
| Perseids * | 13–14 August 2027 | 90% | 90% | 2.0 | 65° |
| Orionids | 21–22 October 2027 | 62% | 59% | 3.7 | 68° |
| Leonids * | 17–18 November 2027 | 27% | 82% | 2.0 | 72° |
| Leonids * | 18–19 November 2027 | 32% | 73% | 3.3 | 72° |
| Geminids | 14–15 December 2027 | 28% | 98% | 0.0 | 85° |
* The peak falls in daylight in Europe, so both neighbouring nights are shown.
Clear peak night: at least 2 hours with ≤ 20 % cloud while the Sun is below −12°, on the same calendar night ± 1 in 2006–2025.