Dark Sky Odds

Stargazing at Thorington Street: when is the sky clear and dark?

December is the best month for stargazing at Thorington Street: on average 30 clear, moonless hours of full darkness, and 19% of nights have at least two of them (ERA5, 2006–2025). The darkest spot we found there is darker than 36% of Europe’s land (NASA VIIRS 2025).

Data updated: 31 December 2025 · Sources and licences

Calculated 5 November 2026 · cloud cover ERA5 2006–2025 · night lights NASA VIIRS 2025

International Dark Sky Community · United Kingdom · DarkSky International

DecemberBest month
235Clear moonless dark hours a year
36%darker than … of Europe’s land
19%Nights with ≥ 2 such hours (December)

Month by month

MonthNights with ≥ 2 such hoursClear moonless dark hoursMoonless dark hoursOf them clear
January18%2817316%
February20%2814619%
March18%2412919%
April17%228625%
May6%62325%
June0%00—
July1%2920%
August13%167222%
September18%2611622%
October16%2515316%
November19%2917317%
December19%3018916%

No astronomical darkness (June): the Sun stays above −18° all night.

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 than36% of Europe’s land
Light pollutionnoticeable light glow
Sky-glow index (own, VIIRS) — Darkest spot we found6.95
Sky-glow index (own, VIIRS) — at the official map point8.65
Sky-glow index (own, VIIRS) — median across the area8.65
Darkest spot we found51.992, 0.925 (map) — within 3.0 km of the Wikidata point (no OSM boundary)

Next new moons

New moonNightMoonless dark hours that nightTypical share of good nights that month
9 November 20268–9 November 202610.819%
9 December 20268–9 December 202612.019%
7 January 20277–8 January 202711.818%
6 February 20276–7 February 202710.820%
8 March 20277–8 March 20279.018%
6 April 20276–7 April 20276.517%
6 May 20275–6 May 20273.56%
4 June 20274–5 June 20270.00%
4 July 20273–4 July 20270.01%
2 August 20271–2 August 20272.713%
31 August 202731 August 2027 – 1 September 20276.213%
30 September 202729–30 September 20278.518%

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

ShowerPeak nightChance of a clear peak nightMoon litMoonless dark hours (Sun < −12°)Radiant max. height
Leonids17–18 November 202643%55%6.860°
Geminids *13–14 December 202623%20%10.771°
Geminids *14–15 December 202630%29%9.571°
Quadrantids3–4 January 202735%13%12.574°
Lyrids22–23 April 202730%95%1.570°
Eta Aquariids *5–6 May 202728%0%5.89°
Eta Aquariids *6–7 May 202733%1%5.710°
Perseids *12–13 August 202727%84%3.266°
Perseids *13–14 August 202728%90%2.268°
Orionids21–22 October 202737%58%2.854°
Leonids *17–18 November 202743%82%1.360°
Leonids *18–19 November 202742%72%2.860°
Geminids14–15 December 202730%98%0.071°

* 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.

How we calculate