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Janakkala

60.900° N   24.600° E  ·  118 M
46 /100
PEAK
Nothing usable opens up tonight.
NO USABLE WINDOW · NO ASTRO DARK · MOON 0%
Transparency
0.70
Seeing
1.00
Cloud
11%
Moon
0%
At this latitude the sun never drops 18° below the horizon tonight, so astronomical darkness never arrives. Scores reflect the deepest twilight available.

Fair tonight

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

Sky state
Lighter = daylight and twilight  ·  unshaded = astronomical dark
Score
22
23
00
01
02
03
04
05
0
6
26
45
46
31
12
0
Low cloud
96%
70%
39%
14%
1%
0%
0%
0%
Mid cloud
0%
0%
0%
0%
0%
0%
0%
0%
High cloud
0%
0%
0%
0%
10%
24%
23%
17%
Transparency
0.72
0.70
0.56
0.45
0.37
0.32
0.26
0.21
Seeing
0.81
0.90
1.00
0.98
0.97
0.99
1.00
1.00
Moon clear
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
22 Clouded out · 0/100
Starting from
100
Cloud
−96
Transparency
−1
Seeing
−0
Moonlight
−0
Darkness
−4
Score
0
CLOUD 96% LOW 96% MID 0% HIGH 0% SUN -3.8° MOON -1.7° / 0% WIND 4 TEMP 14°
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 00:30 · OBSERVE 01:00–03:00 · 2H · MEAN 37

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

22000204
CLOUD BREAKS 01:00TWILIGHT BEGINS 03:00
SET UP 23:30 · OBSERVE 00:00–05:00 · 5H · MEAN 61

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

22000204
CLOUD BREAKS 00:00TWILIGHT BEGINS 05:00MOONLIGHT IGNORED FOR THIS TARGET
SET UP 00:30 · OBSERVE 01:00–03:00 · 2H · MEAN 39

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

22000204
CLOUD BREAKS 01:00TWILIGHT BEGINS 03:00
NO USABLE WINDOW FOR THIS TARGET TONIGHT

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

22000204
NO ASTRONOMICAL DARKNESS
SET UP 00:30 · OBSERVE 01:00–03:00 · 2H · MEAN 40

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

22000204
CLOUD BREAKS 01:00TWILIGHT BEGINS 03:00
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The next week of nights

Tonight · 12 Aug
46
Fair
MOON 0%
Tomorrow · 13 Aug
10
Clouded out
MOON 2%
Friday · 14 Aug
1
Clouded out
MOON 5%
Saturday · 15 Aug
15
Poor
MOON 13%
Sunday · 16 Aug
22
Poor
MOON 21%
Monday · 17 Aug
34
Poor
MOON 30%
Tuesday · 18 Aug
28
Poor
MOON 39%
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Nearby locations

About this forecast

Conditions for Janakkala, Finland 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 →