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Azusa

34.134° N   117.908° W  ·  187 M
40 /100
PEAK
Marginal, but there is a 7 hours gap from 22:00.
BEST WINDOW 22:00–05:00 · ASTRO DARK 22:00–05:00 · MOON 1%
Transparency
0.68
Seeing
1.00
Cloud
74%
Moon
1%

Fair tonight

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

Sky state
Lighter = daylight and twilight  ·  unshaded = astronomical dark
Score
20
21
22
23
00
01
02
03
04
05
06
0
40
40
38
37
37
36
36
36
26
0
BEST WINDOW
Low cloud
0%
0%
0%
2%
2%
1%
1%
2%
1%
1%
2%
Mid cloud
0%
0%
0%
0%
0%
0%
0%
0%
0%
0%
0%
High cloud
91%
74%
95%
98%
99%
99%
99%
100%
100%
97%
83%
Transparency
0.75
0.68
0.62
0.59
0.57
0.54
0.52
0.51
0.50
0.50
0.47
Seeing
0.87
0.93
0.96
0.99
1.00
1.00
1.00
1.00
1.00
1.00
1.00
Moon clear
0%
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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
20 Clouded out · 0/100
Starting from
100
Cloud
−50
Transparency
−5
Seeing
−1
Moonlight
−0
Darkness
−43
Score
0
CLOUD 91% LOW 0% MID 0% HIGH 91% SUN -4.2° MOON 0.5° / 0% WIND 3 TEMP 25°
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 21:30 · OBSERVE 22:00–23:00 · 1H · MEAN 36

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

202200020406
ASTRONOMICAL DARK FROM 22:00
SET UP 20:30 · OBSERVE 21:00–06:00 · 9H · MEAN 40

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

202200020406
HIGH CLOUD CLEARS 21:00TWILIGHT BEGINS 06:00MOONLIGHT 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.

202200020406
CLOUD NEVER DROPS BELOW 74%
NO USABLE WINDOW FOR THIS TARGET TONIGHT

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

202200020406
CLOUD NEVER DROPS BELOW 74%
NO USABLE WINDOW FOR THIS TARGET TONIGHT

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

202200020406
CLOUD NEVER DROPS BELOW 74%
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The next week of nights

Tonight · 12 Aug
40
Fair
MOON 1%
22:00–05:00
Tomorrow · 13 Aug
77
Excellent
MOON 3%
22:00–05:00
Friday · 14 Aug
85
Excellent
MOON 7%
22:00–00:00
Saturday · 15 Aug
81
Excellent
MOON 17%
23:00–00:00
Sunday · 16 Aug
68
Good
MOON 25%
23:00–00:00
Monday · 17 Aug
71
Good
MOON 35%
23:00–00:00
Tuesday · 18 Aug
90
Excellent
MOON 44%
23:00–00:00
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Nearby locations

About this forecast

Conditions for Azusa, California, United States 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 →