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Discovery Bay

22.300° N 114.017° E · 10 M

52 /100
PEAK

Marginal, but there is a 4 hours gap from 01:00.

BEST WINDOW 01:00–05:00 · ASTRO DARK 01:00–05:00 · MOON 0%

Transparency

0.42

Seeing

0.57

Cloud

33%

Moon

Fair tonight

Hour by hour, local to Discovery Bay. Colour encodes the score and nothing else; every other measurement is luminance.

Sky state

Lighter = daylight and twilight · unshaded = astronomical dark

Score

BEST WINDOW

Low cloud

24%

20%

23%

Mid cloud

10%

13%

High cloud

13%

28%

37%

23%

28%

39%

Transparency

0.32

0.36

0.39

0.42

0.41

Seeing

0.56

0.54

0.56

0.57

0.56

0.58

Moon clear

down

Inspect

Cloud tracks show clear sky — a longer bar is better. The figure inside each track is the raw measurement.

Why this hour scored what it did

01 Fair · 45/100

Starting from

100

Cloud

−30

Transparency

−19

Seeing

−6

Moonlight

−0

Darkness

−0

Score

CLOUD 35% LOW 24% MID 1% HIGH 13% SUN -52.0° MOON -51.3° / 0% WIND 6 TEMP 29°

Excellent 75+ Good 55+ Fair 35+ Poor 15+ Not worth it Seeing is estimated from surface wind — see how we score.

What are you doing tonight?

The same forecast, weighted for the target. Planetary work barely cares about moonlight; long exposures die on high cloud a visual observer would never notice.

Deep-sky visualPlanetary & lunarWide-field imagingLong exposureMeteor watching

SET UP 00:30 · OBSERVE 01:00–05:00 · 4H · MEAN 49

Darkness and moonlight dominate. Faint fuzzies need a genuinely dark sky more than they need steady air.

010305

TWILIGHT BEGINS 05:00

SET UP 00:30 · OBSERVE 01:00–06:00 · 5H · MEAN 47

Seeing is everything and moonlight is irrelevant. Bright targets punch through twilight, so darkness barely counts.

010305

CLOUD RETURNS 06:00MOONLIGHT IGNORED FOR THIS TARGET

SET UP 00:30 · OBSERVE 01:00–05:00 · 4H · MEAN 45

Tolerates soft seeing, but high cloud wrecks a wide frame and moonlight raises the background everywhere.

010305

TWILIGHT BEGINS 05:00

SET UP 03:30 · OBSERVE 04:00–05:00 · 1H · MEAN 39

Needs conditions to hold still for hours. Sustained transparency matters more than any single good hour.

010305

TWILIGHT BEGINS 05:00

SET UP 00:30 · OBSERVE 01:00–05:00 · 4H · MEAN 51

Naked eye, whole sky. Total cloud and moonlight are the only things that count.

010305

TWILIGHT BEGINS 05:00

The next week of nights

Tonight · 12 Aug

Fair

MOON 0%
01:00–05:00

Tomorrow · 13 Aug

Poor

MOON 1%

Friday · 14 Aug

Poor

MOON 5%

Saturday · 15 Aug

Poor

MOON 10%

Sunday · 16 Aug

Clouded out

MOON 19%

Monday · 17 Aug

Fair

MOON 28%
02:00–03:00

Tuesday · 18 Aug

Clouded out

MOON 37%

Nearby locations

About this forecast

Conditions for Discovery Bay, Hong Kong are computed from the MET Norway forecast model for these exact coordinates, combined with sun and moon positions we calculate directly. The score weighs cloud cover by layer, atmospheric transparency, estimated seeing, moonlight and how dark the sky actually gets. Read the full method →