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Guankou

28.159° N   113.627° E  ·  79 M
26 /100
PEAK
Nothing usable opens up tonight.
NO USABLE WINDOW · ASTRO DARK 00:00–05:00 · MOON 0%
Transparency
0.10
Seeing
1.00
Cloud
70%
Moon
0%

Poor tonight

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

Sky state
Lighter = daylight and twilight  ·  unshaded = astronomical dark
Score
00
01
02
03
04
05
06
26
8
23
5
0
0
0
Low cloud
13%
5%
27%
73%
100%
100%
100%
Mid cloud
43%
88%
37%
63%
34%
33%
45%
High cloud
44%
67%
47%
60%
40%
9%
5%
Transparency
0.10
0.10
0.10
0.10
0.10
0.10
0.10
Seeing
1.00
1.00
1.00
1.00
0.98
0.94
0.94
Moon clear
down
down
down
down
down
down
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
00 Poor · 26/100
Starting from
100
Cloud
−59
Transparency
−15
Seeing
−0
Moonlight
−0
Darkness
−0
Score
26
CLOUD 70% LOW 13% MID 43% HIGH 44% SUN -46.2° MOON -45.0° / 0% WIND 2 TEMP 24°
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.

NO USABLE WINDOW FOR THIS TARGET TONIGHT

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

00020406
CLOUD NEVER DROPS BELOW 70%
NO USABLE WINDOW FOR THIS TARGET TONIGHT

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

00020406
CLOUD NEVER DROPS BELOW 70%
NO USABLE WINDOW FOR THIS TARGET TONIGHT

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

00020406
CLOUD NEVER DROPS BELOW 70%
NO USABLE WINDOW FOR THIS TARGET TONIGHT

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

00020406
CLOUD NEVER DROPS BELOW 70%
NO USABLE WINDOW FOR THIS TARGET TONIGHT

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

00020406
CLOUD NEVER DROPS BELOW 70%
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The next week of nights

Tonight · 12 Aug
26
Poor
MOON 0%
Tomorrow · 13 Aug
52
Fair
MOON 1%
22:00–00:00
Friday · 14 Aug
63
Good
MOON 5%
22:00–02:00
Saturday · 15 Aug
36
Fair
MOON 10%
02:00–03:00
Sunday · 16 Aug
61
Good
MOON 19%
02:00–03:00
Monday · 17 Aug
69
Good
MOON 28%
02:00–03:00
Tuesday · 18 Aug
48
Fair
MOON 37%
02:00–03:00
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Nearby locations

About this forecast

Conditions for Guankou, China 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 →