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Jiashan

30.849° N   120.926° E  ·  7 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
0.26
Seeing
0.87
Cloud
47%
Moon
0%

Fair tonight

Hour by hour, local to Jiashan. 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
23
5
14
20
0
BEST WINDOW
Low cloud
20%
20%
16%
12%
13%
23%
Mid cloud
18%
54%
96%
74%
60%
61%
High cloud
20%
33%
53%
54%
31%
9%
Transparency
0.25
0.25
0.25
0.26
0.26
0.26
Seeing
0.85
0.86
0.87
0.87
0.86
0.87
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
−40
Transparency
−18
Seeing
−2
Moonlight
−0
Darkness
−0
Score
40
CLOUD 47% LOW 20% MID 18% HIGH 20% SUN -44.2° MOON -43.0° / 0% WIND 4 TEMP 27°
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 40

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 47

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 36

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 47%
SET UP 23:30 · OBSERVE 00:00–01:00 · 1H · MEAN 39

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
28
Poor
MOON 1%
Friday · 14 Aug
33
Poor
MOON 5%
Saturday · 15 Aug
27
Poor
MOON 10%
Sunday · 16 Aug
68
Good
MOON 19%
02:00–03:00
Monday · 17 Aug
63
Good
MOON 28%
20:00–21:00
Tuesday · 18 Aug
26
Poor
MOON 37%
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About this forecast

Conditions for Jiashan, 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 →