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Mapo

34.517° N   117.067° E  ·  38 M
51 /100
PEAK
Marginal, but there is a 1 hour gap from 04:00.
BEST WINDOW 04:00–05:00 · ASTRO DARK 01:00–04:00 · MOON 0%
Transparency
0.36
Seeing
0.90
Cloud
26%
Moon
0%

Fair tonight

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

Sky state
Lighter = daylight and twilight  ·  unshaded = astronomical dark
Score
01
02
03
04
05
06
7
7
12
51
2
0
BEST WINDOW
Low cloud
0%
4%
8%
0%
1%
2%
Mid cloud
100%
100%
91%
25%
57%
31%
High cloud
0%
1%
0%
1%
0%
0%
Transparency
0.36
0.32
0.28
0.27
0.25
0.26
Seeing
0.86
0.85
0.86
0.87
0.90
0.87
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
01 Clouded out · 7/100
Starting from
100
Cloud
−90
Transparency
−3
Seeing
−0
Moonlight
−0
Darkness
−0
Score
7
CLOUD 100% LOW 0% MID 100% HIGH 0% SUN -39.5° MOON -38.8° / 0% WIND 3 TEMP 24°
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 03:30 · OBSERVE 04:00–05:00 · 1H · MEAN 51

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

010305
CLOUD BREAKS 04:00CLOUD RETURNS 05:00
SET UP 03:30 · OBSERVE 04:00–05:00 · 1H · MEAN 62

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

010305
CLOUD BREAKS 04:00CLOUD RETURNS 05:00MOONLIGHT IGNORED FOR THIS TARGET
SET UP 03:30 · OBSERVE 04:00–05:00 · 1H · MEAN 48

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

010305
CLOUD BREAKS 04:00CLOUD RETURNS 05:00
SET UP 03:30 · OBSERVE 04:00–05:00 · 1H · MEAN 38

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

010305
CLOUD BREAKS 04:00CLOUD RETURNS 05:00
SET UP 03:30 · OBSERVE 04:00–05:00 · 1H · MEAN 53

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

010305
CLOUD BREAKS 04:00CLOUD RETURNS 05:00
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The next week of nights

Tonight · 12 Aug
51
Fair
MOON 0%
04:00–05:00
Tomorrow · 13 Aug
64
Good
MOON 1%
01:00–05:00
Friday · 14 Aug
60
Good
MOON 5%
21:00–02:00
Saturday · 15 Aug
64
Good
MOON 10%
02:00–03:00
Sunday · 16 Aug
7
Clouded out
MOON 19%
Monday · 17 Aug
31
Poor
MOON 28%
Tuesday · 18 Aug
68
Good
MOON 37%
02:00–03:00
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Nearby locations

About this forecast

Conditions for Mapo, 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 →