Clear Outside v1.0 - International Weather Forecasts For Astronomers

Monday 24

Waxing Gibbous 90%

19:35

No Set

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

Sun - Rise: 06:41, Set: 20:47, Transit: 13:44. Moon - Rise: 19:35, Set: No Set. Civil Dark: 21:23 - 06:04. Nautical Dark: 22:09 - 05:19. Astro Dark: 23:02 - 04:26

Total Clouds (% Sky Obscured)

6
11
13
13
22
20
10
12
20
21
23
22
19
18
16
12
17
11
0
0
0
0
0
45

Low Clouds (% Sky Obscured)

6
11
13
13
18
17
8
10
15
16
17
19
15
15
13
11
15
11
0
0
0
0
0
0

Medium Clouds (% Sky Obscured)

6
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0

High Clouds (% Sky Obscured)

0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
35

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
2
1
1
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
4
4
4
4
5
5
6
8
9
10
10
10
10
11
12
12
11
9
8
10
11
11
11

Chance of Frost

Temperature (°C)

11
11
11
11
11
11
12
14
16
18
19
20
21
22
22
22
22
21
20
18
17
16
16
15

Feels Like (°C)

13
12
12
12
12
12
12
14
15
17
18
19
20
20
20
20
20
20
19
18
16
15
14
14

Dew Point (°C)

8
8
8
9
9
9
8
8
8
8
8
7
7
7
6
6
6
7
8
8
8
8
8
9

Relative Humidity (%)

81
83
83
84
86
87
80
68
59
53
47
42
39
37
35
34
35
38
44
52
55
58
59
66

Pressure (mb)

1024
1024
1024
1024
1024
1024
1024
1024
1024
1023
1023
1022
1022
1021
1020
1019
1018
1018
1018
1018
1018
1017
1017
1017

Ozone (du)

347
347
346
347
346
346
347
346
345
346
346
346
347
346
342
334
332
332
333
330
330
331
331
328

Tuesday 25

Waxing Gibbous 95%

19:57

03:03

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

Sun - Rise: 06:42, Set: 20:45, Transit: 13:43. Moon - Rise: 19:57, Set: 03:03. Civil Dark: 21:21 - 06:06. Nautical Dark: 22:06 - 05:21. Astro Dark: 22:58 - 04:29

Total Clouds (% Sky Obscured)

16
5
10
2
3
2
5
24
52
100
67
100
94
33
81
92
99
100
97
82
83
69
60
64

Low Clouds (% Sky Obscured)

0
0
0
0
0
0
0
0
0
0
0
0
22
16
75
25
2
40
45
34
16
22
40
45

Medium Clouds (% Sky Obscured)

0
0
0
0
0
0
0
0
0
0
0
0
0
18
74
53
95
100
43
27
57
69
51
64

High Clouds (% Sky Obscured)

12
4
7
2
2
1
5
23
51
100
67
100
93
27
32
92
79
15
20
2
23
1
1
5

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
1
1
1
2
5
7
17
25
20
18
14
21
38

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

Chance of Frost

Temperature (°C)

14
14
13
13
12
12
13
15
17
19
21
23
23
24
25
24
22
21
20
19
18
18
17
17

Feels Like (°C)

11
12
11
10
10
11
11
12
14
16
16
19
19
21
22
22
19
18
18
18
17
16
16
15

Dew Point (°C)

9
8
8
8
8
8
7
7
7
6
6
8
12
13
13
12
10
11
11
13
14
15
15
15

Relative Humidity (%)

68
69
70
72
73
72
66
59
51
44
38
40
48
51
48
45
47
51
55
66
73
82
88
90

Pressure (mb)

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

Ozone (du)

328
326
324
322
322
320
321
321
321
320
318
317
315
315
316
316
314
314
314
316
317
316
314
310

Wednesday 26

Waxing Gibbous 98%

20:13

04:19

02 Bad
03 Bad
04 Bad
05 Bad
06 Bad
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 Bad
01 Bad

Sun - Rise: 06:44, Set: 20:42, Transit: 13:43. Moon - Rise: 20:13, Set: 04:19. Civil Dark: 21:18 - 06:08. Nautical Dark: 22:04 - 05:23. Astro Dark: 22:55 - 04:31

Total Clouds (% Sky Obscured)

58
52
85
100
100
100
99
100
100
89
90
77
86
100
97
87
77
97
97
95
92
80
94
79

Low Clouds (% Sky Obscured)

40
41
35
36
25
23
33
45
54
61
64
40
46
66
68
57
35
48
40
39
25
12
6
0

Medium Clouds (% Sky Obscured)

58
22
82
69
26
28
23
21
21
48
61
15
15
12
13
10
6
0
1
3
3
5
6
6

High Clouds (% Sky Obscured)

1
1
73
100
100
65
84
100
100
26
49
59
75
75
71
76
77
97
94
87
82
73
90
70

ISS Passover

Visibility (miles)

9
9
9
9
9
9
9
9
9
9
9
9
9
7
8
9
7
4
7
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
Light Rain
Light Rain
None
None
Light Rain
Light Rain
None
Light Rain
Light Rain
Light Rain
None
None
None
None
None
None

Precipitation Probability (%)

28
10
12
12
12
18
33
51
74
63
21
30
65
81
55
68
77
89
39
31
21
12
6
0

Precipitation Amount (mm)

0
0
0
0
0
0
0
0
0.7
0.4
0
0
0.4
0.8
0
0.4
0.5
0.9
0
0
0
0
0
0

Wind Speed/Direction (mph)

9
9
8
7
6
6
6
7
8
8
8
8
8
8
4
4
4
6
7
7
7
7
6
7

Chance of Frost

Temperature (°C)

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

Feels Like (°C)

15
15
16
16
16
15
15
16
17
18
20
23
24
24
25
27
27
24
22
21
21
20
20
19

Dew Point (°C)

15
15
15
15
15
14
14
14
14
14
16
15
14
17
17
15
15
17
18
18
18
18
18
17

Relative Humidity (%)

92
95
95
95
95
93
90
85
79
76
76
63
56
65
64
55
57
67
76
82
86
88
89
89

Pressure (mb)

1012
1012
1012
1012
1012
1012
1012
1012
1012
1013
1013
1013
1013
1013
1013
1013
1012
1012
1012
1012
1013
1012
1012
1012

Ozone (du)

309
311
310
310
309
310
311
314
315
316
318
321
321
319
317
315
313
313
313
314
314
315
314
314

Thursday 27

Waxing Gibbous 100%

20:27

05:37

02 Bad
03 Bad
04 Bad
05 Bad
06 Bad
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 Bad
01 Bad

Sun - Rise: 06:46, Set: 20:40, Transit: 13:43. Moon - Rise: 20:27, Set: 05:37. Civil Dark: 21:16 - 06:10. Nautical Dark: 22:01 - 05:25. Astro Dark: 22:52 - 04:34

Total Clouds (% Sky Obscured)

85
71
60
73
83
94
95
98
100
87
74
64
76
78
100
100
100
100
100
100
100
100
100
100

Low Clouds (% Sky Obscured)

3
6
11
13
13
18
18
18
40
29
19
40
49
53
35
36
39
41
63
57
67
73
61
77

Medium Clouds (% Sky Obscured)

8
6
11
41
83
33
21
58
99
87
74
64
51
16
13
21
36
95
97
99
100
97
88
49

High Clouds (% Sky Obscured)

82
66
44
44
45
46
61
80
100
81
61
52
68
54
100
100
100
100
100
100
100
97
100
100

ISS Passover

Visibility (miles)

9
9
9
9
9
7
9
9
9
9
9
9
9
9
9
7
5
3
1
2
1
1
4
3

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

Precipitation Probability (%)

1
4
5
25
54
5
6
3
7
40
18
20
54
60
74
95
95
95
95
95
95
95
95
95

Precipitation Amount (mm)

0
0
0
0
0.5
0
0
0
0
0
0
0
0.2
0.4
0.6
1
1.3
2.6
3.3
5.7
9.9
4.2
0.9
0.9

Wind Speed/Direction (mph)

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

Chance of Frost

Temperature (°C)

19
18
18
18
18
18
18
19
20
21
23
24
25
25
25
25
24
23
21
20
20
19
18
18

Feels Like (°C)

19
18
18
18
19
19
19
20
21
21
23
24
25
25
27
25
25
24
24
22
22
20
20
18

Dew Point (°C)

17
16
16
16
17
17
17
17
17
17
17
19
20
19
17
17
17
18
19
19
19
19
17
17

Relative Humidity (%)

90
89
89
89
92
92
90
84
80
76
66
71
76
70
63
63
62
73
84
92
98
96
93
95

Pressure (mb)

1012
1012
1011
1011
1011
1010
1010
1010
1010
1009
1009
1009
1009
1009
1008
1008
1007
1006
1006
1005
1004
1004
1004
1004

Ozone (du)

314
314
314
315
313
312
314
315
316
316
317
318
322
325
321
319
318
317
315
312
311
316
320
327

Friday 28

Full Moon 100%

20:38

06:55

02 Bad
03 Bad
04 Bad
05 Bad
06 Bad
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 Bad
01 Bad

Sun - Rise: 06:47, Set: 20:38, Transit: 13:43. Moon - Rise: 20:38, Set: 06:55. Civil Dark: 21:14 - 06:12. Nautical Dark: 21:58 - 05:27. Astro Dark: 22:49 - 04:37

Total Clouds (% Sky Obscured)

93
85
74
79
83
86
70
66
74
77
53
64
56
49
42
44
52
55
70
86
100
99
99
98

Low Clouds (% Sky Obscured)

74
78
71
79
83
86
64
54
54
65
42
56
48
40
32
30
29
27
27
26
20
28
42
56

Medium Clouds (% Sky Obscured)

91
85
33
21
0
0
0
15
49
45
5
5
16
27
40
42
42
44
47
50
55
49
30
17

High Clouds (% Sky Obscured)

80
30
10
31
19
15
15
29
44
29
15
0
0
0
0
2
7
12
43
74
96
95
98
98

ISS Passover

Visibility (miles)

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

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

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

Precipitation Probability (%)

95
78
70
79
74
69
81
75
86
95
93
88
91
78
62
56
57
65
59
47
33
36
40
46

Precipitation Amount (mm)

0.5
0.3
0.3
0.6
0.4
0
0.6
0.4
0.5
1
0.8
0.7
0.7
0.5
0.3
0
0
0.3
0.3
0
0
0
0
0

Wind Speed/Direction (mph)

8
9
11
12
11
12
12
12
13
14
14
14
14
14
13
13
12
11
10
9
9
9
9
10

Chance of Frost

Temperature (°C)

18
17
17
17
17
17
17
18
18
19
19
20
21
21
21
21
20
19
18
18
17
16
16
16

Feels Like (°C)

17
16
16
15
15
15
15
16
17
17
18
19
19
20
20
20
20
20
19
17
17
18
17
17

Dew Point (°C)

17
17
16
16
16
16
15
15
15
15
15
16
16
16
16
16
16
16
15
15
15
14
14
14

Relative Humidity (%)

95
95
93
92
93
92
85
82
82
81
77
75
75
74
74
73
75
78
81
83
86
87
87
86

Pressure (mb)

1004
1004
1004
1003
1003
1004
1004
1005
1005
1006
1006
1006
1006
1006
1006
1006
1006
1006
1006
1006
1006
1006
1006
1006

Ozone (du)

332
343
346
343
343
341
342
342
344
345
346
346
345
344
343
342
342
342
342
340
338
336
335
334

Saturday 29

Waning Gibbous 99%

20:49

08:12

02 Bad
03 Bad
04 Bad
05 Bad
06 Bad
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 Bad
01 OK

Sun - Rise: 06:49, Set: 20:36, Transit: 13:42. Moon - Rise: 20:49, Set: 08:12. Civil Dark: 21:11 - 06:13. Nautical Dark: 21:56 - 05:29. Astro Dark: 22:45 - 04:39

Total Clouds (% Sky Obscured)

93
87
82
79
77
77
78
72
70
75
81
86
81
75
70
75
79
82
87
93
99
74
51
32

Low Clouds (% Sky Obscured)

46
39
29
22
19
16
37
54
70
60
45
35
48
51
59
50
42
32
42
52
62
55
50
32

Medium Clouds (% Sky Obscured)

14
10
6
3
1
0
1
2
3
14
26
35
40
44
50
51
50
50
58
65
74
63
51
32

High Clouds (% Sky Obscured)

93
87
82
79
58
55
36
41
66
74
79
86
66
46
24
34
41
34
23
8
7
1
0
0

ISS Passover

Visibility (miles)

8
8
9
9
8
6
5
5
5
4
6
7
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

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

Precipitation Probability (%)

57
53
52
48
38
36
46
55
63
60
55
50
40
30
18
19
24
32
29
25
15
16
18
19

Precipitation Amount (mm)

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

Wind Speed/Direction (mph)

11
11
11
10
10
11
11
12
13
14
14
15
15
14
13
13
13
12
11
9
6
5
5
5

Chance of Frost

Temperature (°C)

16
16
16
16
17
17
17
18
18
19
20
20
21
21
21
21
20
19
18
18
17
17
17
17

Feels Like (°C)

17
15
15
14
14
15
14
16
16
16
16
16
16
18
18
17
18
18
19
14
15
16
15
15

Dew Point (°C)

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

Relative Humidity (%)

85
86
87
90
86
83
81
82
83
84
80
76
73
66
61
55
64
73
83
85
85
85
85
85

Pressure (mb)

1006
1006
1006
1007
1007
1007
1008
1008
1009
1009
1010
1010
1010
1010
1011
1011
1011
1011
1011
1011
1011
1011
1011
1011

Ozone (du)

333
333
333
333
332
332
332
330
329
328
327
326
325
324
324
324
324
323
323
323
323
323
321
319

Sunday 30

Waning Gibbous 96%

21:00

09:31

Sun - Rise: 06:51, Set: 20:33, Transit: 13:42. Moon - Rise: 21:00, Set: 09:31. Civil Dark: 21:09 - 06:15. Nautical Dark: 21:53 - 05:31. Astro Dark: 22:42 - 04:42

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 Leiden, Gemeente Leiden, Netherlands (52.16,4.50)

Generated: 24/08/26 02:43:54. Forecast: 24/08/26 to 30/08/26. Timezone: UTC+2.00