Clear Outside v1.0 - International Weather Forecasts For Astronomers

Tuesday 16

Waning Crescent 30%

01:00

17:18

04 Bad
05 Bad
06 OK
07 Bad
08 Bad
09 Bad
10 Bad
11 Bad
12 Bad
13 Bad
14 Bad
15 Bad
16 Bad
17 Bad
18 Bad
19 Bad
20 Bad
21 Bad
22 Bad
23 Bad
00 OK
01 Bad
02 Bad
03 Bad

Sun - Rise: 06:40, Set: 19:12, Transit: 12:56. Moon - Rise: 01:00, Set: 17:18. Civil Dark: 19:45 - 06:07. Nautical Dark: 20:24 - 05:29. Astro Dark: 21:04 - 04:48

Total Clouds (% Sky Obscured)

76
60
45
100
100
100
100
60
48
94
88
85
81
77
83
37
43
43
51
94
34
59
63
44

Low Clouds (% Sky Obscured)

0
1
11
25
14
40
38
52
45
44
23
1
1
4
5
26
2
3
9
24
3
6
7
2

Medium Clouds (% Sky Obscured)

0
0
0
0
0
0
2
0
25
31
29
37
77
71
72
28
43
43
51
94
34
59
42
27

High Clouds (% Sky Obscured)

76
60
45
100
100
100
100
43
24
76
66
65
65
70
4
0
20
0
0
0
0
4
34
25

ISS Passover

Visibility (miles)

9
9
9
9
9
9
9
9
9
9
9
9
9
9
9
9
9
9
9
9
9
9
9
9

Fog (%)

0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0

Precipitation Type

None
None
None
None
None
None
None
None
None
None
None
None
None
None
None
None
None
None
None
None
None
None
None
None

Precipitation Probability (%)

0
0
0
0
0
0
0
0
0
0
0
0
0
0
5
22
7
6
10
12
10
6
2
0

Precipitation Amount (mm)

0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0

Wind Speed/Direction (mph)

10
9
9
11
12
14
16
17
18
18
18
17
15
15
14
12
10
10
11
11
12
13
13
12

Chance of Frost

Temperature (°C)

15
14
14
13
13
15
16
17
18
18
18
18
18
18
17
16
14
14
14
13
13
13
13
12

Feels Like (°C)

13
11
10
9
9
11
12
12
13
13
12
12
13
13
12
11
12
11
11
11
9
10
9
9

Dew Point (°C)

12
11
10
9
10
10
9
7
7
6
6
6
7
8
8
7
6
6
6
6
7
8
8
8

Relative Humidity (%)

79
78
76
77
78
71
64
54
48
44
44
45
48
51
53
54
57
60
59
61
65
70
74
75

Pressure (mb)

1016
1016
1016
1016
1017
1017
1017
1017
1017
1017
1017
1017
1017
1017
1017
1018
1018
1019
1019
1019
1019
1019
1020
1020

Ozone (du)

276
278
280
282
284
288
293
297
298
298
300
300
300
301
302
303
308
309
307
309
307
306
308
309

Wednesday 17

Waning Crescent 20%

02:21

17:47

04 OK
05 OK
06 OK
07 OK
08 Bad
09 Bad
10 Bad
11 Bad
12 Bad
13 Bad
14 Bad
15 Bad
16 Bad
17 Bad
18 OK
19 Bad
20 Bad
21 Bad
22 Bad
23 Bad
00 Bad
01 Bad
02 Bad
03 Bad

Sun - Rise: 06:41, Set: 19:10, Transit: 12:56. Moon - Rise: 02:21, Set: 17:47. Civil Dark: 19:43 - 06:09. Nautical Dark: 20:21 - 05:30. Astro Dark: 21:02 - 04:50

Total Clouds (% Sky Obscured)

23
23
32
44
73
62
99
100
90
100
100
99
94
60
39
55
49
52
66
69
84
100
91
85

Low Clouds (% Sky Obscured)

2
1
2
7
2
7
31
39
35
30
47
60
55
30
35
16
4
3
10
45
57
80
61
84

Medium Clouds (% Sky Obscured)

11
15
0
2
50
49
39
38
67
71
71
62
33
31
28
33
42
44
48
62
61
65
72
76

High Clouds (% Sky Obscured)

7
9
23
25
67
53
96
100
51
91
98
38
29
18
0
0
0
0
21
1
12
69
59
21

ISS Passover

Visibility (miles)

9
9
9
9
9
9
9
9
9
9
9
9
9
9
9
9
9
9
9
9
9
9
9
9

Fog (%)

0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0

Precipitation Type

None
None
None
None
None
None
None
None
None
None
None
None
None
None
None
None
None
None
None
None
None
None
Very Light Rain
None

Precipitation Probability (%)

0
0
0
0
0
0
1
1
3
2
0
0
0
0
0
0
0
0
0
6
35
26
38
21

Precipitation Amount (mm)

0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0.2
0

Wind Speed/Direction (mph)

12
11
10
10
10
12
13
14
13
12
13
12
12
12
10
7
7
7
7
7
7
7
7
7

Chance of Frost

Temperature (°C)

12
11
11
11
11
13
14
15
17
17
18
18
18
18
17
15
14
14
13
13
13
13
13
13

Feels Like (°C)

9
9
9
8
9
9
11
11
13
14
14
14
14
14
15
14
13
13
12
12
12
11
11
11

Dew Point (°C)

8
8
8
7
7
7
7
7
7
6
5
5
6
6
7
8
7
7
8
9
9
9
9
10

Relative Humidity (%)

77
79
81
80
76
69
61
57
51
45
42
42
45
47
53
61
61
64
69
74
77
77
76
81

Pressure (mb)

1020
1020
1021
1021
1021
1022
1022
1022
1021
1021
1021
1020
1020
1020
1021
1021
1021
1022
1022
1022
1021
1021
1021
1021

Ozone (du)

311
309
300
293
288
284
280
277
274
270
267
266
263
260
258
257
256
258
258
257
258
258
257
257

Thursday 18

Waning Crescent 12%

03:41

18:08

04 Bad
05 Bad
06 Bad
07 Bad
08 Bad
09 Bad
10 Bad
11 Bad
12 Bad
13 Bad
14 Bad
15 OK
16 OK
17 OK
18 Good
19 Good
20 Good
21 OK
22 Good
23 Good
00 Good
01 Good
02 OK
03 Good

Sun - Rise: 06:43, Set: 19:08, Transit: 12:55. Moon - Rise: 03:41, Set: 18:08. Civil Dark: 19:40 - 06:10. Nautical Dark: 20:19 - 05:32. Astro Dark: 20:59 - 04:52

Total Clouds (% Sky Obscured)

94
86
91
83
91
98
92
92
82
89
67
46
42
40
0
12
16
20
18
18
18
17
18
18

Low Clouds (% Sky Obscured)

90
80
86
83
77
96
80
68
57
84
54
28
21
5
0
12
10
5
0
8
18
17
18
18

Medium Clouds (% Sky Obscured)

76
68
72
58
53
50
57
88
21
62
18
16
31
29
0
0
10
17
18
18
10
3
6
9

High Clouds (% Sky Obscured)

18
10
3
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0

ISS Passover

Visibility (miles)

9
9
9
9
9
9
9
9
9
9
9
9
9
9
9
9
9
9
9
9
9
9
9
9

Fog (%)

0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0

Precipitation Type

None
None
None
None
None
None
None
None
None
None
None
None
None
None
None
None
None
None
None
None
None
None
None
None

Precipitation Probability (%)

3
3
1
1
2
4
1
2
0
0
0
0
0
0
0
0
0
0
0
0
0
0
1
0

Precipitation Amount (mm)

0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0

Wind Speed/Direction (mph)

7
7
8
7
7
9
8
9
8
8
6
6
7
8
9
7
6
5
4
3
3
3
3
2

Chance of Frost

Temperature (°C)

13
14
14
14
15
16
16
18
18
20
21
22
23
22
21
19
18
17
17
17
16
16
16
15

Feels Like (°C)

12
12
12
12
14
14
14
16
17
19
22
23
24
23
21
20
19
19
20
19
19
18
19
18

Dew Point (°C)

10
10
10
10
10
10
10
10
11
11
11
11
11
12
14
14
14
14
14
14
14
13
13
13

Relative Humidity (%)

80
75
75
76
73
67
68
60
63
54
52
49
48
53
67
76
78
79
81
83
85
83
85
85

Pressure (mb)

1021
1021
1020
1021
1021
1021
1021
1021
1021
1021
1021
1021
1021
1021
1021
1021
1022
1023
1023
1024
1024
1024
1025
1025

Ozone (du)

257
256
255
256
256
255
256
257
257
256
254
254
253
251
250
248
248
247
246
247
246
246
245
244

Friday 19

Waning Crescent 6%

No Rise

18:24

04 Good
05 Good
06 Good
07 Good
08 OK
09 OK
10 OK
11 OK
12 OK
13 OK
14 OK
15 Good
16 Good
17 Good
18 OK
19 OK
20 OK
21 OK
22 Good
23 Good
00 OK
01 OK
02 OK
03 Good

Sun - Rise: 06:44, Set: 19:06, Transit: 12:55. Moon - Rise: No Rise, Set: 18:24. Civil Dark: 19:38 - 06:12. Nautical Dark: 20:16 - 05:34. Astro Dark: 20:56 - 04:53

Total Clouds (% Sky Obscured)

16
16
17
17
20
20
22
26
32
37
29
16
2
2
25
30
29
24
14
6
19
35
35
17

Low Clouds (% Sky Obscured)

16
16
17
17
20
20
22
26
32
37
29
13
0
0
0
0
0
0
0
2
3
5
11
15

Medium Clouds (% Sky Obscured)

12
11
12
13
8
4
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
1
18
1

High Clouds (% Sky Obscured)

0
0
0
0
0
0
0
0
0
0
0
1
2
1
25
15
15
12
5
1
8
9
3
0

ISS Passover

Visibility (miles)

9
9
9
9
9
9
9
9
9
9
9
9
9
9
9
9
9
9
9
9
9
9
9
9

Fog (%)

0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0

Precipitation Type

None
None
None
None
None
None
None
None
None
None
None
None
None
None
None
None
None
None
None
None
None
None
None
None

Precipitation Probability (%)

0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0

Precipitation Amount (mm)

0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0

Wind Speed/Direction (mph)

3
3
3
3
2
3
4
5
5
5
4
4
4
4
4
4
4
4
4
4
4
4
4
4

Chance of Frost

Temperature (°C)

15
15
15
15
15
17
19
21
22
24
25
25
25
25
23
21
20
19
18
17
16
15
15
14

Feels Like (°C)

18
17
16
17
18
20
21
22
24
25
26
26
26
26
24
20
19
18
18
17
17
15
14
14

Dew Point (°C)

13
13
13
13
13
13
13
13
12
12
11
10
10
11
12
12
12
12
12
12
12
12
12
12

Relative Humidity (%)

86
87
87
87
83
73
65
58
52
47
42
38
36
40
48
54
60
66
70
74
77
80
84
87

Pressure (mb)

1025
1025
1025
1026
1026
1026
1026
1026
1026
1026
1025
1025
1024
1024
1024
1024
1024
1024
1024
1024
1024
1024
1024
1023

Ozone (du)

243
242
242
242
242
243
244
244
244
243
244
244
244
245
245
244
244
244
244
245
245
245
245
246

Saturday 20

Waning Crescent 2%

04:58

18:36

04 OK
05 OK
06 OK
07 Bad
08 Bad
09 OK
10 OK
11 Good
12 OK
13 Bad
14 Bad
15 Bad
16 OK
17 OK
18 OK
19 OK
20 OK
21 OK
22 OK
23 OK
00 OK
01 OK
02 OK
03 OK

Sun - Rise: 06:46, Set: 19:03, Transit: 12:55. Moon - Rise: 04:58, Set: 18:36. Civil Dark: 19:36 - 06:14. Nautical Dark: 20:14 - 05:35. Astro Dark: 20:54 - 04:55

Total Clouds (% Sky Obscured)

20
16
21
61
57
45
23
18
38
88
72
59
44
40
32
25
32
37
45
47
42
41
22
20

Low Clouds (% Sky Obscured)

20
16
15
12
8
4
0
3
7
10
7
3
0
0
0
0
0
0
0
1
1
2
2
1

Medium Clouds (% Sky Obscured)

0
0
0
0
0
0
0
10
20
30
26
13
0
0
0
0
0
0
0
0
0
0
0
0

High Clouds (% Sky Obscured)

0
0
2
15
14
11
8
2
8
50
45
45
36
24
17
11
13
13
8
5
7
21
17
13

ISS Passover

Visibility (miles)

9
9
9
9
9
9
9
9
9
9
9
9
9
9
9
9
9
9
9
9
9
9
9
9

Fog (%)

0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0

Precipitation Type

None
None
None
None
None
None
None
None
None
None
None
None
None
None
None
None
None
None
None
None
None
None
None
None

Precipitation Probability (%)

0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0

Precipitation Amount (mm)

0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0

Wind Speed/Direction (mph)

3
3
3
3
3
3
5
6
6
6
6
6
6
6
6
6
6
5
5
4
4
3
3
3

Chance of Frost

Temperature (°C)

14
14
13
13
14
16
19
21
23
25
26
26
27
27
25
23
21
20
19
18
18
17
17
16

Feels Like (°C)

15
15
15
15
14
17
19
22
24
26
25
25
25
26
26
27
27
21
21
20
20
19
19
16

Dew Point (°C)

12
12
12
12
12
12
12
13
13
13
13
14
14
15
15
15
16
15
14
13
13
13
13
13

Relative Humidity (%)

89
89
89
90
84
75
66
59
53
47
45
45
45
47
53
61
73
72
73
73
74
76
77
79

Pressure (mb)

1023
1023
1023
1022
1022
1022
1022
1021
1020
1019
1018
1018
1017
1016
1016
1016
1016
1016
1016
1016
1016
1016
1016
1016

Ozone (du)

246
246
246
245
245
246
246
247
247
246
246
245
245
245
244
244
243
244
244
245
244
244
243
245

Sunday 21

New Moon 0%

06:11

18:48

04 Good
05 OK
06 OK
07 Bad
08 Bad
09 OK
10 OK
11 OK
12 OK
13 OK
14 OK
15 OK
16 OK
17 OK
18 Bad
19 Bad
20 Bad
21 Bad
22 Bad
23 Bad
00 Bad
01 Bad
02 Bad
03 Bad

Sun - Rise: 06:47, Set: 19:01, Transit: 12:54. Moon - Rise: 06:11, Set: 18:48. Civil Dark: 19:33 - 06:15. Nautical Dark: 20:12 - 05:37. Astro Dark: 20:51 - 04:57

Total Clouds (% Sky Obscured)

10
28
47
64
51
37
24
21
23
25
27
26
32
38
44
48
61
62
68
69
58
50
65
72

Low Clouds (% Sky Obscured)

0
8
15
22
19
12
5
9
13
16
16
17
18
23
30
34
31
33
35
30
25
25
41
65

Medium Clouds (% Sky Obscured)

0
1
2
3
3
3
2
2
1
0
10
21
31
31
31
30
21
15
9
30
47
50
62
58

High Clouds (% Sky Obscured)

8
8
7
7
6
6
5
8
11
14
10
5
0
0
0
0
0
1
1
14
39
50
48
39

ISS Passover

Visibility (miles)

9
9
9
9
9
9
9
9
9
9
9
9
9
9
9
9
9
9
9
9
9
9
9
9

Fog (%)

0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0

Precipitation Type

None
None
None
None
None
None
None
None
None
None
None
None
None
None
None
Light Rain
Very Light Rain
None
None
Very Light Rain
Very Light Rain
None
Very Light Rain
None

Precipitation Probability (%)

0
0
0
0
1
1
0
1
1
0
4
7
5
12
31
57
53
47
46
69
69
64
66
53

Precipitation Amount (mm)

0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0.4
0.2
0
0
0.3
0.3
0
0.3
0

Wind Speed/Direction (mph)

2
2
1
1
2
3
4
5
5
5
6
6
6
7
5
5
7
8
9
10
9
8
7
6

Chance of Frost

Temperature (°C)

16
16
16
16
15
17
19
21
22
23
24
24
24
24
23
21
19
18
18
17
16
16
15
15

Feels Like (°C)

16
16
16
16
16
17
18
19
20
21
22
27
26
26
26
26
25
17
18
17
17
17
16
14

Dew Point (°C)

13
13
13
13
12
13
13
13
14
14
15
15
15
15
16
17
17
16
16
15
15
14
13
13

Relative Humidity (%)

82
83
83
82
80
74
68
62
59
56
54
55
55
57
66
76
88
88
88
87
89
87
87
87

Pressure (mb)

1016
1015
1016
1016
1016
1016
1016
1016
1015
1015
1014
1013
1013
1012
1012
1012
1012
1013
1013
1013
1014
1014
1014
1014

Ozone (du)

246
247
247
248
249
250
252
254
254
253
253
254
254
254
255
255
255
255
256
256
257
258
258
259

Monday 22

Waxing Crescent 0%

07:23

18:59

Sun - Rise: 06:49, Set: 18:59, Transit: 12:54. Moon - Rise: 07:23, Set: 18:59. Civil Dark: 19:31 - 06:17. Nautical Dark: 20:09 - 05:38. Astro Dark: 20:49 - 04:59

Total Clouds (% Sky Obscured)

Low Clouds (% Sky Obscured)

Medium Clouds (% Sky Obscured)

High Clouds (% Sky Obscured)

ISS Passover

Visibility (miles)

Fog (%)

Precipitation Type

Precipitation Probability (%)

Precipitation Amount (mm)

Wind Speed/Direction (mph)

Chance of Frost

Temperature (°C)

Feels Like (°C)

Dew Point (°C)

Relative Humidity (%)

Pressure (mb)

Ozone (du)

Forecast for Letňany, Praha 18, Czech Republic (50.14,14.52)

Generated: 16/09/25 04:01:36. Forecast: 16/09/25 to 22/09/25. Timezone: UTC+2.00