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Oro Valley

32.391° N   110.966° W  ·  774 M
53 /100
PEAK
Marginal, but there is a 1 hour gap from 04:00.
BEST WINDOW 04:00–05:00 · ASTRO DARK 21:00–05:00 · MOON 1%
Transparency
0.64
Seeing
0.87
Cloud
52%
Moon
1%

Fair tonight

Hour by hour, local to Oro Valley. 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
0
6
27
23
21
20
32
33
26
53
18
0
BEST WINDOW
Low cloud
0%
0%
6%
2%
13%
9%
1%
1%
20%
3%
0%
0%
Mid cloud
18%
60%
27%
27%
26%
26%
1%
1%
14%
1%
0%
0%
High cloud
87%
98%
98%
99%
98%
98%
84%
95%
89%
51%
56%
17%
Transparency
0.67
0.62
0.64
0.31
0.26
0.11
0.10
0.38
0.43
0.47
0.50
0.51
Seeing
0.89
0.86
0.83
0.78
0.79
0.84
0.82
0.80
0.84
0.85
0.87
0.90
Moon clear
0%
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
−56
Transparency
−6
Seeing
−1
Moonlight
−0
Darkness
−37
Score
0
CLOUD 89% LOW 0% MID 18% HIGH 87% SUN 1.6° MOON 6.0° / 0% WIND 3 TEMP 26°
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.

192123010305
HIGH CLOUD CLEARS 04:00TWILIGHT BEGINS 05:00
SET UP 03:30 · OBSERVE 04:00–06:00 · 2H · MEAN 50

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

192123010305
HIGH CLOUD CLEARS 04:00TWILIGHT BEGINS 06:00MOONLIGHT IGNORED FOR THIS TARGET
SET UP 03:30 · OBSERVE 04:00–05:00 · 1H · MEAN 44

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

192123010305
HIGH CLOUD CLEARS 04:00TWILIGHT BEGINS 05:00
NO USABLE WINDOW FOR THIS TARGET TONIGHT

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

192123010305
CONDITIONS STAY BELOW THE USABLE THRESHOLD
SET UP 03:30 · OBSERVE 04:00–05:00 · 1H · MEAN 50

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

192123010305
HIGH CLOUD CLEARS 04:00TWILIGHT BEGINS 05:00
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The next week of nights

Tonight · 12 Aug
53
Fair
MOON 1%
04:00–05:00
Tomorrow · 13 Aug
71
Good
MOON 3%
22:00–05:00
Friday · 14 Aug
72
Good
MOON 7%
21:00–00:00
Saturday · 15 Aug
81
Excellent
MOON 17%
23:00–00:00
Sunday · 16 Aug
94
Excellent
MOON 25%
23:00–00:00
Monday · 17 Aug
51
Fair
MOON 35%
23:00–00:00
Tuesday · 18 Aug
29
Poor
MOON 44%
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Nearby locations

About this forecast

Conditions for Oro Valley, Arizona, 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 →