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Trelew

-43.249° S   65.305° W  ·  14 M
68 /100
PEAK
Worth setting up — 2 hours of workable sky from 05:00.
BEST WINDOW 05:00–07:00 · ASTRO DARK 21:00–07:00 · MOON 0%
Transparency
0.32
Seeing
0.98
Cloud
2%
Moon
0%

Good tonight

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

Sky state
Lighter = daylight and twilight  ·  unshaded = astronomical dark
Score
19
20
21
22
23
00
01
02
03
04
05
06
07
08
0
59
60
27
24
18
0
11
51
18
65
68
46
0
BEST WINDOW
Low cloud
0%
2%
6%
34%
39%
46%
95%
34%
2%
1%
1%
1%
2%
4%
Mid cloud
0%
1%
4%
0%
1%
10%
99%
58%
23%
81%
5%
2%
9%
10%
High cloud
0%
0%
0%
19%
7%
2%
4%
30%
0%
0%
0%
0%
0%
0%
Transparency
0.44
0.32
0.23
0.18
0.17
0.15
0.15
0.17
0.21
0.24
0.28
0.30
0.30
0.25
Seeing
0.89
0.94
0.97
0.96
0.96
0.98
0.96
0.94
0.89
0.88
0.88
0.86
0.86
0.88
Moon clear
down
down
down
down
down
down
down
down
down
down
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
19 Clouded out · 0/100
Starting from
100
Cloud
−0
Transparency
−22
Seeing
−2
Moonlight
−0
Darkness
−76
Score
0
CLOUD 0% LOW 0% MID 0% HIGH 0% SUN -5.4° MOON -2.0° / 0% WIND 3 TEMP 6°
Excellent 75+ Good 55+ Fair 35+ Poor 15+ Not worth it Seeing is estimated from surface wind — see how we score.
Tonight's limiting factor
Conditions for planets and the Moon

Seeing is everything. Darkness and moonlight barely matter, and a hazy, humid night that ruins deep-sky work is often the steadiest night of the year for planetary detail.

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 04:30 · OBSERVE 05:00–08:00 · 3H · MEAN 58

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

19212301030507
CLOUD BREAKS 05:00TWILIGHT BEGINS 08:00
SET UP 04:30 · OBSERVE 05:00–08:00 · 3H · MEAN 75

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

19212301030507
CLOUD BREAKS 05:00TWILIGHT BEGINS 08:00MOONLIGHT IGNORED FOR THIS TARGET
SET UP 04:30 · OBSERVE 05:00–08:00 · 3H · MEAN 56

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

19212301030507
CLOUD BREAKS 05:00TWILIGHT BEGINS 08:00
SET UP 04:30 · OBSERVE 05:00–07:00 · 2H · MEAN 55

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

19212301030507
CLOUD BREAKS 05:00TWILIGHT BEGINS 07:00
SET UP 04:30 · OBSERVE 05:00–08:00 · 3H · MEAN 63

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

19212301030507
CLOUD BREAKS 05:00TWILIGHT BEGINS 08:00
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The next week of nights

Tonight · 12 Aug
68
Good
MOON 0%
05:00–07:00
Tomorrow · 13 Aug
40
Fair
MOON 3%
23:00–00:00
Friday · 14 Aug
66
Good
MOON 7%
21:00–04:00
Saturday · 15 Aug
32
Poor
MOON 15%
Sunday · 16 Aug
54
Fair
MOON 23%
21:00–22:00
Monday · 17 Aug
76
Excellent
MOON 32%
03:00–04:00
Tuesday · 18 Aug
74
Good
MOON 42%
03:00–04:00
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Nearby locations

About this forecast

Conditions for Trelew, Argentina 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 →