Clear Outside v1.0 - International Weather Forecasts For Astronomers

Monday 21

Waxing Gibbous 77%

18:00

02:00

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

Sun - Rise: 07:27, Set: 19:42, Transit: 13:34. Moon - Rise: 18:00, Set: 02:00. Civil Dark: 20:16 - 06:55. Nautical Dark: 20:56 - 06:15. Astro Dark: 21:38 - 05:33

Total Clouds (% Sky Obscured)

94
81
73
100
99
88
89
79
78
54
75
40
26
33
32
44
44
60
72
82
91
97
66
54

Low Clouds (% Sky Obscured)

10
0
13
23
26
25
28
24
23
25
29
26
18
22
15
33
37
53
59
72
87
93
53
46

Medium Clouds (% Sky Obscured)

86
64
66
58
48
15
11
12
12
11
12
10
10
9
12
10
11
3
5
7
1
6
13
8

High Clouds (% Sky Obscured)

14
31
66
100
96
61
70
44
42
22
24
1
0
11
4
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 (%)

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)

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

Chance of Frost

Temperature (°C)

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

Feels Like (°C)

11
12
14
16
15
16
16
17
17
16
17
15
17
16
16
16
15
15
16
13
13
13
13
13

Dew Point (°C)

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

Relative Humidity (%)

66
70
69
62
59
56
53
50
48
48
51
55
62
67
70
73
71
73
73
65
64
62
62
63

Pressure (mb)

1029
1030
1030
1030
1031
1031
1031
1031
1031
1030
1030
1030
1030
1030
1030
1030
1030
1030
1030
1030
1030
1029
1029
1029

Ozone (du)

281
279
277
277
275
272
272
273
273
273
273
273
274
274
275
275
276
277
276
275
275
274
274
274

Tuesday 22

Waxing Gibbous 85%

18:19

03:17

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

Sun - Rise: 07:28, Set: 19:40, Transit: 13:34. Moon - Rise: 18:19, Set: 03:17. Civil Dark: 20:14 - 06:56. Nautical Dark: 20:54 - 06:16. Astro Dark: 21:35 - 05:35

Total Clouds (% Sky Obscured)

57
59
65
71
84
92
91
79
70
58
37
28
16
36
40
42
47
55
63
76
68
54
72
87

Low Clouds (% Sky Obscured)

46
43
51
54
77
88
89
67
65
54
34
27
16
36
40
37
39
44
52
51
48
41
40
42

Medium Clouds (% Sky Obscured)

6
11
7
7
6
5
3
1
0
0
0
0
0
0
0
0
0
0
0
0
0
0
7
12

High Clouds (% Sky Obscured)

0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
7
7
20
25
46
39
10
11
15

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
1
0
0
0
1
1
1
0
0
0
0
0
0
0
0
0
0
13
16
13
97
89

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)

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

Chance of Frost

Temperature (°C)

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

Feels Like (°C)

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

Dew Point (°C)

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

Relative Humidity (%)

69
70
66
58
56
56
57
60
62
62
62
64
67
72
76
77
78
79
82
84
84
86
84
86

Pressure (mb)

1029
1029
1029
1029
1030
1029
1029
1029
1029
1029
1028
1028
1028
1028
1028
1028
1028
1028
1027
1027
1027
1026
1026
1026

Ozone (du)

274
275
276
275
274
274
274
274
274
275
276
276
276
276
275
276
277
279
279
279
278
278
279
279

Wednesday 23

Waxing Gibbous 92%

18:33

04:34

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
02 Bad
03 Bad
04 Bad
05 Bad
06 Bad

Sun - Rise: 07:30, Set: 19:37, Transit: 13:34. Moon - Rise: 18:33, Set: 04:34. Civil Dark: 20:11 - 06:58. Nautical Dark: 20:51 - 06:18. Astro Dark: 21:33 - 05:37

Total Clouds (% Sky Obscured)

86
91
97
95
100
93
92
99
93
98
90
84
92
61
75
60
65
57
67
70
71
63
77
78

Low Clouds (% Sky Obscured)

44
39
36
42
65
78
61
76
80
74
78
77
88
48
67
60
65
57
67
70
71
62
71
68

Medium Clouds (% Sky Obscured)

13
16
21
14
17
14
14
18
20
23
88
39
30
14
67
0
0
0
0
0
0
0
0
0

High Clouds (% Sky Obscured)

25
20
59
69
95
33
25
89
25
38
25
0
0
0
11
0
0
0
0
2
5
8
15
22

ISS Passover

Visibility (miles)

9
9
9
9
9
9
9
9
9
9
8
3
5
9
6
9
9
9
9
9
9
9
9
9

Fog (%)

70
45
11
1
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
Very Light Rain
Light Rain
None
Light Rain
None
None
None
None
None
None
None
None
None
None

Precipitation Probability (%)

1
1
0
1
1
2
7
28
47
47
60
77
71
95
55
28
18
16
2
12
7
7
25
29

Precipitation Amount (mm)

0
0
0
0
0
0
0
0
0
0
0.2
0.5
0
1
0
0
0
0
0
0
0
0
0
0

Wind Speed/Direction (mph)

3
3
4
4
5
6
5
6
8
8
8
7
7
6
9
12
10
11
11
11
12
12
11
11

Chance of Frost

Temperature (°C)

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

Feels Like (°C)

13
13
14
15
16
17
18
19
17
17
18
17
17
17
17
14
15
12
12
11
10
10
9
9

Dew Point (°C)

11
11
10
10
11
11
12
11
10
10
12
14
16
16
15
15
14
12
11
10
9
8
6
6

Relative Humidity (%)

84
83
76
70
65
61
63
56
56
58
62
73
88
93
90
92
87
79
76
73
69
65
62
63

Pressure (mb)

1026
1026
1025
1025
1025
1025
1025
1024
1024
1023
1023
1022
1022
1022
1022
1022
1023
1023
1023
1023
1023
1023
1023
1023

Ozone (du)

280
281
282
282
283
283
284
284
285
286
288
292
302
307
310
318
320
323
323
323
321
317
316
310

Thursday 24

Waxing Gibbous 96%

18:46

05:52

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
02 Bad
03 Bad
04 Bad
05 Bad
06 Bad

Sun - Rise: 07:32, Set: 19:35, Transit: 13:33. Moon - Rise: 18:46, Set: 05:52. Civil Dark: 20:09 - N/A. Nautical Dark: 20:49 - 06:20. Astro Dark: 21:30 - 05:39

Total Clouds (% Sky Obscured)

81
75
72
65
65
65
69
75
88
98
97
95
94
91
88
85
90
95
100
100
100
100
97
93

Low Clouds (% Sky Obscured)

59
47
39
35
40
50
54
54
57
55
48
42
30
35
26
26
29
28
27
29
26
22
23
22

Medium Clouds (% Sky Obscured)

0
0
0
0
0
0
0
0
0
0
3
5
10
5
6
4
2
4
5
5
6
1
0
2

High Clouds (% Sky Obscured)

29
30
32
27
17
10
50
20
78
56
84
89
86
85
83
85
90
95
100
100
100
100
96
92

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 (%)

31
22
30
23
23
20
2
0
0
0
0
1
0
0
1
2
0
2
7
0
3
0
0
9

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

Chance of Frost

Temperature (°C)

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

Feels Like (°C)

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

Dew Point (°C)

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

Relative Humidity (%)

69
70
69
68
70
68
67
62
63
65
66
68
71
73
74
76
82
84
84
86
86
87
86
87

Pressure (mb)

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

Ozone (du)

304
303
302
301
301
300
298
296
294
293
291
290
289
288
287
286
286
285
284
282
281
281
280
280

Friday 25

Waxing Gibbous 99%

18:57

No Set

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

Sun - Rise: 07:33, Set: 19:33, Transit: 13:33. Moon - Rise: 18:57, Set: No Set. Civil Dark: 20:06 - 07:00. Nautical Dark: 20:46 - 06:22. Astro Dark: 21:27 - 05:41

Total Clouds (% Sky Obscured)

89
62
47
30
54
68
83
78
74
69
51
38
22
24
24
27
42
56
70
54
36
20
24
27

Low Clouds (% Sky Obscured)

22
23
25
25
27
27
46
46
42
41
33
27
19
21
24
27
42
49
52
36
26
15
11
10

Medium Clouds (% Sky Obscured)

4
0
2
4
54
68
76
51
28
2
2
1
0
1
1
2
17
28
42
28
14
1
0
0

High Clouds (% Sky Obscured)

83
57
37
9
33
56
75
70
65
59
40
21
2
2
4
3
2
1
0
0
0
0
2
10

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
3
3
6
2
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)

4
4
4
4
4
4
4
4
4
5
5
5
4
4
4
5
5
5
5
4
4
4
5
5

Chance of Frost

Temperature (°C)

13
13
14
16
18
19
21
21
21
21
21
19
17
16
15
14
14
14
13
13
13
13
13
13

Feels Like (°C)

12
13
16
16
18
20
21
21
21
21
20
20
20
19
15
15
16
16
15
15
13
13
14
14

Dew Point (°C)

11
11
11
12
12
12
13
13
13
13
12
12
12
11
11
11
11
11
11
11
11
11
11
11

Relative Humidity (%)

87
87
82
74
67
62
60
59
59
59
59
63
70
75
78
80
83
84
86
87
89
90
90
90

Pressure (mb)

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

Ozone (du)

280
280
280
280
279
279
278
278
278
278
279
279
279
280
280
280
280
280
281
282
283
284
285
286

Saturday 26

Full Moon 100%

19:08

07:11

07 OK
08 OK
09 OK
10 OK
11 OK
12 OK
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
02 Bad
03 Bad
04 Bad
05 Bad
06 Bad

Sun - Rise: 07:35, Set: 19:30, Transit: 13:33. Moon - Rise: 19:08, Set: 07:11. Civil Dark: 20:04 - 07:01. Nautical Dark: 20:44 - 06:23. Astro Dark: 21:25 - 05:42

Total Clouds (% Sky Obscured)

27
24
28
28
38
47
57
61
65
70
80
89
100
98
96
95
96
98
100
100
100
100
100
100

Low Clouds (% Sky Obscured)

8
10
19
19
18
18
14
9
8
4
3
1
0
0
0
0
1
2
2
7
12
16
16
13

Medium Clouds (% Sky Obscured)

0
1
2
4
4
4
4
4
4
4
24
45
68
73
77
82
67
52
36
32
33
33
34
29

High Clouds (% Sky Obscured)

16
16
8
2
17
34
50
58
62
69
79
89
100
93
83
75
82
91
100
100
100
100
100
100

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
1
2
3
1
0
0
2
5
3
9
8
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)

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

Chance of Frost

Temperature (°C)

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

Feels Like (°C)

13
13
13
14
14
14
14
15
21
20
20
20
20
21
15
16
16
16
16
15
14
14
15
15

Dew Point (°C)

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

Relative Humidity (%)

92
92
83
75
69
63
57
52
49
47
45
49
53
58
60
62
64
73
80
92
90
86
84
84

Pressure (mb)

1017
1017
1017
1017
1017
1017
1017
1017
1017
1016
1016
1016
1016
1016
1016
1016
1016
1016
1016
1016
1016
1016
1016
1016

Ozone (du)

286
287
287
287
287
286
285
284
283
283
283
284
285
287
288
289
290
292
294
295
296
296
297
297

Sunday 27

Waning Gibbous 98%

19:20

08:33

Sun - Rise: 07:37, Set: 19:28, Transit: 13:32. Moon - Rise: 19:20, Set: 08:33. Civil Dark: 20:02 - 07:03. Nautical Dark: 20:41 - 06:25. Astro Dark: 21:22 - 05:44

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: 21/09/26 07:13:02. Forecast: 21/09/26 to 27/09/26. Timezone: UTC+2.00