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Tempe Junction

33.414° N   111.944° W  ·  352 M
70 /100
PEAK
Worth setting up — 2 hours of workable sky from 03:00.
BEST WINDOW 03:00–05:00 · ASTRO DARK 21:00–05:00 · MOON 1%
Transparency
1.00
Seeing
0.99
Cloud
3%
Moon
1%

Good tonight

Hour by hour, local to Tempe Junction. 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
20
70
30
27
38
25
27
51
67
27
0
BEST WINDOW
Low cloud
0%
0%
0%
0%
2%
1%
2%
2%
3%
2%
0%
0%
Mid cloud
3%
5%
9%
33%
8%
9%
27%
23%
8%
2%
1%
2%
High cloud
26%
27%
23%
84%
97%
87%
95%
81%
16%
1%
2%
2%
Transparency
1.00
1.00
0.69
0.60
0.14
0.53
0.24
0.10
0.10
0.30
0.41
0.44
Seeing
0.82
0.92
0.99
0.82
0.88
0.93
0.99
0.85
0.87
0.90
0.95
0.99
Moon clear
0%
down
down
down
down
down
down
down
down
down
down
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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
19 Clouded out · 0/100
Starting from
100
Cloud
−17
Transparency
−0
Seeing
−4
Moonlight
−0
Darkness
−80
Score
0
CLOUD 28% LOW 0% MID 3% HIGH 26% SUN 2.7° MOON 7.0° / 0% WIND 4 TEMP 34°
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 02:30 · OBSERVE 03:00–05:00 · 2H · MEAN 60

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

192123010305
HIGH CLOUD CLEARS 03:00TWILIGHT BEGINS 05:00
SET UP 02:30 · OBSERVE 03:00–06:00 · 3H · MEAN 70

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

192123010305
HIGH CLOUD CLEARS 03:00TWILIGHT BEGINS 06:00MOONLIGHT IGNORED FOR THIS TARGET
SET UP 02:30 · OBSERVE 03:00–05:00 · 2H · MEAN 55

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

192123010305
HIGH CLOUD CLEARS 03:00TWILIGHT BEGINS 05:00
SET UP 02:30 · OBSERVE 03:00–05:00 · 2H · MEAN 45

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

192123010305
HIGH CLOUD CLEARS 03:00TWILIGHT BEGINS 05:00
SET UP 02:30 · OBSERVE 03:00–05:00 · 2H · MEAN 64

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

192123010305
HIGH CLOUD CLEARS 03:00TWILIGHT BEGINS 05:00
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The next week of nights

Tonight · 12 Aug
70
Good
MOON 1%
03:00–05:00
Tomorrow · 13 Aug
59
Good
MOON 3%
00:00–05:00
Friday · 14 Aug
82
Excellent
MOON 7%
21:00–00:00
Saturday · 15 Aug
42
Fair
MOON 17%
23:00–00:00
Sunday · 16 Aug
99
Excellent
MOON 25%
23:00–00:00
Monday · 17 Aug
96
Excellent
MOON 35%
23:00–00:00
Tuesday · 18 Aug
59
Good
MOON 44%
23:00–00:00
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Nearby locations

About this forecast

Conditions for Tempe Junction, 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 →