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Shibetsu

43.659° N   145.132° E  ·  2 M
0 /100
PEAK
Cloud will spoil it. Not a night for the telescope.
NO USABLE WINDOW · ASTRO DARK 21:00–03:00 · MOON 1%
Transparency
0.22
Seeing
0.84
Cloud
29%
Moon
1%

Clouded out tonight

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

Sky state
Lighter = daylight and twilight  ·  unshaded = astronomical dark
Score
18
19
20
21
22
23
00
01
02
03
04
0
1
35
0
0
0
0
0
0
0
0
Low cloud
27%
23%
29%
100%
100%
100%
100%
100%
100%
100%
100%
Mid cloud
0%
0%
0%
0%
0%
0%
0%
0%
0%
0%
0%
High cloud
22%
12%
0%
0%
0%
0%
0%
0%
1%
7%
14%
Transparency
0.29
0.22
0.19
0.16
0.16
0.18
0.20
0.20
0.19
0.20
0.20
Seeing
0.63
0.69
0.75
0.80
0.80
0.81
0.81
0.84
0.83
0.83
0.83
Moon clear
1%
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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
18 Clouded out · 0/100
Starting from
100
Cloud
−36
Transparency
−18
Seeing
−4
Moonlight
−0
Darkness
−42
Score
0
CLOUD 43% LOW 27% MID 0% HIGH 22% SUN 3.9° MOON 8.8° / 1% WIND 6 TEMP 22°
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.

NO USABLE WINDOW FOR THIS TARGET TONIGHT

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

182022000204
CONDITIONS STAY BELOW THE USABLE THRESHOLD
SET UP 19:30 · OBSERVE 20:00–21:00 · 1H · MEAN 49

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

182022000204
CLOUD RETURNS 21:00MOONLIGHT IGNORED FOR THIS TARGET
NO USABLE WINDOW FOR THIS TARGET TONIGHT

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

182022000204
CONDITIONS STAY BELOW THE USABLE THRESHOLD
NO USABLE WINDOW FOR THIS TARGET TONIGHT

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

182022000204
CONDITIONS STAY BELOW THE USABLE THRESHOLD
NO USABLE WINDOW FOR THIS TARGET TONIGHT

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

182022000204
CONDITIONS STAY BELOW THE USABLE THRESHOLD
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The next week of nights

Tonight · 13 Aug
0
Clouded out
MOON 1%
Tomorrow · 14 Aug
24
Poor
MOON 5%
Saturday · 15 Aug
59
Good
MOON 8%
21:00–22:00
Sunday · 16 Aug
33
Poor
MOON 19%
Monday · 17 Aug
46
Fair
MOON 28%
21:00–22:00
Tuesday · 18 Aug
41
Fair
MOON 37%
21:00–22:00
Wednesday · 19 Aug
44
Fair
MOON 47%
21:00–22:00
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Nearby locations

About this forecast

Conditions for Shibetsu, 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 →