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Shuangtang

34.365° N   118.475° E  ·  28 M
40 /100
PEAK
Marginal, but there is a 1 hour gap from 00:00.
BEST WINDOW 00:00–01:00 · ASTRO DARK 00:00–04:00 · MOON 0%
Transparency
0.37
Seeing
0.96
Cloud
52%
Moon
0%

Fair tonight

Hour by hour, local to Shuangtang. 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
40
11
5
17
19
0
BEST WINDOW
Low cloud
5%
0%
4%
1%
6%
5%
Mid cloud
34%
91%
100%
74%
69%
100%
High cloud
31%
36%
40%
31%
31%
70%
Transparency
0.37
0.33
0.35
0.10
0.30
0.10
Seeing
0.93
0.96
0.96
0.93
0.90
0.88
Moon clear
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 Fair · 40/100
Starting from
100
Cloud
−45
Transparency
−14
Seeing
−1
Moonlight
−0
Darkness
−0
Score
40
CLOUD 52% LOW 5% MID 34% HIGH 31% SUN -40.6° MOON -39.4° / 0% WIND 3 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.

SET UP 23:30 · OBSERVE 00:00–01:00 · 1H · MEAN 39

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

000204
CLOUD RETURNS 01:00
SET UP 23:30 · OBSERVE 00:00–01:00 · 1H · MEAN 46

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

000204
CLOUD RETURNS 01:00MOONLIGHT IGNORED FOR THIS TARGET
SET UP 23:30 · OBSERVE 00:00–01:00 · 1H · MEAN 35

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

000204
CLOUD RETURNS 01:00
NO USABLE WINDOW FOR THIS TARGET TONIGHT

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

000204
CLOUD NEVER DROPS BELOW 52%
SET UP 23:30 · OBSERVE 00:00–01:00 · 1H · MEAN 37

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

000204
CLOUD RETURNS 01:00
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The next week of nights

Tonight · 12 Aug
40
Fair
MOON 0%
00:00–01:00
Tomorrow · 13 Aug
52
Fair
MOON 1%
00:00–03:00
Friday · 14 Aug
60
Good
MOON 5%
21:00–04:00
Saturday · 15 Aug
69
Good
MOON 10%
02:00–03:00
Sunday · 16 Aug
64
Good
MOON 19%
02:00–03:00
Monday · 17 Aug
31
Poor
MOON 28%
Tuesday · 18 Aug
66
Good
MOON 37%
02:00–03:00
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Nearby locations

About this forecast

Conditions for Shuangtang, 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 →