GoodSeeing
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Gujō

35.737° N   136.958° E  ·  314 M
48 /100
PEAK
Marginal, but there is a 2 hours gap from 02:00.
BEST WINDOW 02:00–04:00 · ASTRO DARK 02:00–04:00 · MOON 0%
Transparency
0.31
Seeing
1.00
Cloud
41%
Moon
0%

Fair tonight

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

Sky state
Lighter = daylight and twilight  ·  unshaded = astronomical dark
Score
02
03
04
05
41
48
15
0
BEST WINDOW
Low cloud
9%
9%
31%
26%
Mid cloud
36%
19%
51%
96%
High cloud
11%
20%
15%
10%
Transparency
0.31
0.30
0.26
0.28
Seeing
1.00
1.00
1.00
1.00
Moon clear
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
02 Fair · 41/100
Starting from
100
Cloud
−43
Transparency
−16
Seeing
−0
Moonlight
−0
Darkness
−0
Score
41
CLOUD 49% LOW 9% MID 36% HIGH 11% SUN -31.6° MOON -31.4° / 0% WIND 2 TEMP 20°
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 02:00–04:00 · 2H · MEAN 44

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

0204
CLOUD RETURNS 04:00
SET UP 01:30 · OBSERVE 02:00–04:00 · 2H · MEAN 54

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

0204
CLOUD RETURNS 04:00MOONLIGHT IGNORED FOR THIS TARGET
SET UP 01:30 · OBSERVE 02:00–04:00 · 2H · MEAN 40

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

0204
CLOUD RETURNS 04:00
NO USABLE WINDOW FOR THIS TARGET TONIGHT

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

0204
CLOUD NEVER DROPS BELOW 41%
SET UP 01:30 · OBSERVE 02:00–04:00 · 2H · MEAN 43

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

0204
CLOUD RETURNS 04:00
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The next week of nights

Tonight · 12 Aug
48
Fair
MOON 0%
02:00–04:00
Tomorrow · 13 Aug
62
Good
MOON 1%
21:00–01:00
Friday · 14 Aug
41
Fair
MOON 5%
03:00–04:00
Saturday · 15 Aug
54
Fair
MOON 8%
21:00–22:00
Sunday · 16 Aug
33
Poor
MOON 19%
Monday · 17 Aug
29
Poor
MOON 28%
Tuesday · 18 Aug
45
Fair
MOON 37%
21:00–22:00
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Nearby locations

About this forecast

Conditions for Gujō, Japan 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 →