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Chengzihe

45.336° N   131.005° E  ·  199 M
54 /100
PEAK
Marginal, but there is a 2 hours gap from 00:00.
BEST WINDOW 00:00–02:00 · ASTRO DARK 00:00–03:00 · MOON 0%
Transparency
0.37
Seeing
0.97
Cloud
36%
Moon
0%

Fair tonight

Hour by hour, local to Chengzihe. 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
54
48
33
16
0
BEST WINDOW
Low cloud
15%
7%
5%
5%
8%
Mid cloud
0%
0%
0%
0%
0%
High cloud
24%
53%
95%
97%
95%
Transparency
0.37
0.34
0.30
0.28
0.27
Seeing
0.91
0.94
0.95
0.97
0.99
Moon clear
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 · 54/100
Starting from
100
Cloud
−26
Transparency
−19
Seeing
−1
Moonlight
−0
Darkness
−0
Score
54
CLOUD 36% LOW 15% MID 0% HIGH 24% SUN -29.1° MOON -28.0° / 0% WIND 3 TEMP 21°
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 00:00–02:00 · 2H · MEAN 50

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

000204
CLOUD RETURNS 02:00
SET UP 23:30 · OBSERVE 00:00–03:00 · 3H · MEAN 51

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

000204
TWILIGHT BEGINS 03:00MOONLIGHT IGNORED FOR THIS TARGET
SET UP 23:30 · OBSERVE 00:00–02:00 · 2H · MEAN 43

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

000204
CLOUD RETURNS 02:00
SET UP 23:30 · OBSERVE 00:00–01:00 · 1H · MEAN 37

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

000204
CLOUD RETURNS 01:00
SET UP 23:30 · OBSERVE 00:00–02:00 · 2H · MEAN 49

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

000204
CLOUD RETURNS 02:00
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The next week of nights

Tonight · 12 Aug
54
Fair
MOON 0%
00:00–02:00
Tomorrow · 13 Aug
15
Poor
MOON 1%
Friday · 14 Aug
38
Fair
MOON 5%
22:00–23:00
Saturday · 15 Aug
0
Clouded out
MOON 10%
Sunday · 16 Aug
8
Clouded out
MOON 19%
Monday · 17 Aug
52
Fair
MOON 28%
02:00–03:00
Tuesday · 18 Aug
37
Fair
MOON 37%
02:00–03:00
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Nearby locations

About this forecast

Conditions for Chengzihe, 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 →