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Songjianghe

42.186° N   127.479° E  ·  737 M
50 /100
PEAK
Marginal, but there is a 1 hour gap from 02:00.
BEST WINDOW 02:00–03:00 · ASTRO DARK 00:00–03:00 · MOON 0%
Transparency
0.41
Seeing
0.91
Cloud
59%
Moon
0%

Fair tonight

Hour by hour, local to Songjianghe. 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
34
34
50
32
2
0
BEST WINDOW
Low cloud
0%
0%
0%
0%
2%
4%
Mid cloud
0%
0%
0%
0%
0%
0%
High cloud
99%
98%
59%
88%
87%
99%
Transparency
0.39
0.40
0.41
0.39
0.32
0.26
Seeing
0.90
0.90
0.91
0.88
0.90
0.92
Moon clear
down
down
down
down
down
0%
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 · 34/100
Starting from
100
Cloud
−55
Transparency
−11
Seeing
−1
Moonlight
−0
Darkness
−0
Score
34
CLOUD 99% LOW 0% MID 0% HIGH 99% SUN -32.6° MOON -31.5° / 0% WIND 3 TEMP 18°
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 01:30 · OBSERVE 02:00–03:00 · 1H · MEAN 48

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

000204
HIGH CLOUD CLEARS 02:00CLOUD RETURNS 03:00
SET UP 23:30 · OBSERVE 00:00–04:00 · 4H · MEAN 42

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

000204
TWILIGHT BEGINS 04:00MOONLIGHT IGNORED FOR THIS TARGET
SET UP 01:30 · OBSERVE 02:00–03:00 · 1H · MEAN 40

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

000204
HIGH CLOUD CLEARS 02:00CLOUD RETURNS 03:00
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 59%
SET UP 01:30 · OBSERVE 02:00–03:00 · 1H · MEAN 46

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

000204
HIGH CLOUD CLEARS 02:00CLOUD RETURNS 03:00
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The next week of nights

Tonight · 12 Aug
50
Fair
MOON 0%
02:00–03:00
Tomorrow · 13 Aug
5
Clouded out
MOON 1%
Friday · 14 Aug
0
Clouded out
MOON 5%
Saturday · 15 Aug
43
Fair
MOON 10%
02:00–03:00
Sunday · 16 Aug
6
Clouded out
MOON 19%
Monday · 17 Aug
0
Clouded out
MOON 28%
Tuesday · 18 Aug
24
Poor
MOON 37%
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Nearby locations

About this forecast

Conditions for Songjianghe, 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 →