Salome Observing Station
Clear Sky Chart
History

This sumarizes the distribution of each different forecast outcome for the Salome Observing Station clear sky chart from 2005-11-06 to 2024-11-02.

This page is a summary of past forecasts. Even though it's based only on forecasts, some people use these pages as clue to a site's climate. But climate data based on actual observation should be preferred (if you can find it!).

Cloud, Transparency and Seeing forecasts are summarized individually. But because good observing conditions require a combination of minimum cloud cover, transparency and seeing, the individual forecast summaries can be difficult to interpret. The observing conditions section counts the combinations of conditions needed for common types of astronomical observation.

Observing Conditions

The following tables count the occurrence of the combinations of forecast and darkness conditions needed for different observations. Conditions are rated by by what percentage of the hours the observation would likely be attempted are usable.
Observation TypeMinimum conditions for hour to be usableOut of hours
Clear of CloudsTransparencySeeingSky Brightness
Planetary:50%(no limit)Average(no limit)Nighttime Hours
Deep Sky:70%Average(no limit)5.9Nighttime Hours
CCD Imaging:70%Below AveragePoor(no limit)Nighttime Hours

Percentages are of nighttime hours per month, or per year, when a particular observing conditions was met. Deep Sky percentages never exceed 50% because the moon is up half the time. Deep sky percentages are much lower for charts at high latitudes because of fewer dark hours in the summer.

Overall

PlanetaryData
Pts
Deep Sky
Max 60%
Data
Pts
Both Planetary and Deep Sky
Max 60%
Data
Pts
Either Planetary or Deep SkyData
Pts
CCD ImagingData
Pts
Night
75%
25269
38%
92708
33%
25129
82%
25129
57%
36248

By Month

MonthDays of MonthPlanetaryData
Pts
Deep Sky
Max 60%
Data
Pts
Both Planetary and Deep Sky
Max 60%
Data
Pts
Either Planetary or Deep SkyData
Pts
CCD ImagingData
Pts
January1st to 10thNight
71%
750
41%
3966
35%
736
78%
736
42%
1348
January11th to 20thNight
70%
748
45%
3896
36%
740
78%
740
44%
1275
January21st to endNight
63%
827
27%
4143
35%
814
74%
814
32%
1832
February1st to 10thNight
67%
760
40%
2280
34%
760
77%
760
53%
1066
February11th to 20thNight
63%
740
38%
2218
33%
740
74%
740
53%
1052
February21st to endNight
62%
628
36%
1884
33%
628
71%
628
51%
908
March1st to 10thNight
62%
752
46%
3502
28%
744
75%
744
51%
1120
March11th to 20thNight
67%
747
35%
3450
31%
740
77%
740
43%
1380
March21st to endNight
62%
826
26%
3584
26%
814
73%
814
49%
1282
April1st to 10thNight
66%
760
36%
2085
22%
760
75%
760
61%
975
April11th to 20thNight
63%
751
41%
1879
21%
751
73%
751
69%
886
April21st to endNight
70%
594
47%
1734
30%
594
81%
594
78%
687
May1st to 10thNight
71%
563
55%
2625
31%
559
80%
559
69%
693
May11th to 20thNight
73%
551
38%
2707
30%
541
80%
541
66%
721
May21st to endNight
77%
598
32%
3054
30%
593
84%
593
81%
666
June1st to 10thNight
84%
570
39%
1710
34%
570
85%
570
77%
665
June11th to 20thNight
85%
570
40%
1710
34%
570
87%
570
85%
621
June21st to endNight
87%
570
36%
1710
32%
570
88%
570
78%
663
July1st to 10thNight
92%
538
43%
2343
29%
535
93%
535
62%
727
July11th to 20thNight
86%
535
31%
2130
27%
533
86%
533
48%
858
July21st to endNight
84%
604
31%
2288
27%
569
85%
569
48%
898
August1st to 10thNight
88%
554
41%
2426
33%
545
89%
545
46%
982
August11th to 20thNight
89%
675
32%
2465
28%
674
89%
674
57%
989
August21st to endNight
88%
817
39%
2826
30%
814
88%
814
67%
1006
September1st to 10thNight
86%
760
38%
2085
33%
760
87%
760
64%
981
September11th to 20thNight
89%
760
46%
2090
40%
760
91%
760
80%
866
September21st to endNight
86%
760
44%
2090
37%
760
91%
760
76%
895
October1st to 10thNight
79%
760
44%
2090
36%
760
84%
760
66%
953
October11th to 20thNight
84%
760
46%
2190
41%
760
89%
760
78%
879
October21st to endNight
81%
836
48%
2508
41%
836
89%
836
76%
974
November1st to 10thNight
79%
744
42%
2367
40%
744
86%
744
66%
963
November11th to 20thNight
80%
760
42%
2470
42%
760
86%
760
63%
1017
November21st to endNight
71%
760
41%
2470
38%
760
79%
760
55%
1087
December1st to 10thNight
72%
760
39%
2470
37%
760
78%
760
51%
1141
December11th to 20thNight
68%
759
36%
2933
35%
758
75%
758
39%
1425
December21st to endNight
64%
822
25%
4330
34%
817
73%
817
34%
1767

Individual Forecasts

The length of each colored bar in the "occurrence of each Forecast" column is proportional to the number of times the chart forecast that color. The percentages are of the total number of hours per month, or per year, with a particular forecast. The colors as the same as those used in clear sky charts.

Note: Transparency probabilities are only counted for those hours that have 30% or less cloud cover. Seeing probabilities are only counted for those hours that have 80% or less cloud cover. If that's too tricky, try Observing Conditions instead.

Overall

Occurrence of each ForecastData
Points
Cloud CoverDay
2213223245%74%
101049
Night
2213223245%74%
98195
TransparencyDay
12%3412%25%44%
100815
Night
13%3412%25%44%
98018
SeeingDay
3417%33%31%12%
15263
Night
3214%39%35%6%
25492

By Month

Percentage Cloud Cover SW (2006-)
Color Meanings:
Overcast 90% covered 80% covered 70% covered 60% covered 50% covered 40% covered 30% covered 20% covered 10% covered Clear
MonthDays in MonthOccurrence of each ForecastData
Points
January1st to 10thDay
342433325%5%66%
2858
11th to 20thDay
331322335%6%68%
2860
21st to endDay
8%415%33436%8%56%
3219
February1st to 10thDay
3313333346%69%
1900
11th to 20thDay
332332336%7%65%
1850
21st to endDay
3313334246%68%
1570
March1st to 10thDay
2112222247%75%
3261
11th to 20thDay
431333335%6%64%
3490
21st to endDay
2112222246%76%
3825
April1st to 10thDay
1212223447%72%
2091
11th to 20thDay
2212112235%80%
2249
21st to endDay
111111235%83%
2444
May1st to 10thDay
1111112387%
4110
11th to 20thDay
111111223484%
4071
21st to endDay
1111112291%
4477
June1st to 10thDay
11212122484%
2470
11th to 20thDay
11111112391%
2470
21st to endDay
121221123482%
2470
July1st to 10thDay
11222223481%
4110
11th to 20thDay
211323335%7%70%
4110
21st to endDay
331333436%8%63%
4454
August1st to 10thDay
331444447%11%56%
4092
11th to 20thDay
1112223246%75%
3798
21st to endDay
2112223345%76%
4180
September1st to 10thDay
3323324345%66%
2095
11th to 20thDay
21111112485%
2090
21st to endDay
121222223479%
2090
October1st to 10thDay
211322223478%
2090
11th to 20thDay
211123485%
1990
21st to endDay
11211224482%
2090
November1st to 10thDay
1111223245%78%
1730
11th to 20thDay
1213223345%75%
1710
21st to endDay
331322325%6%69%
1710
December1st to 10thDay
3423344347%62%
1710
11th to 20thDay
2325%44447%6%59%
2169
21st to endDay
5%41433447%7%58%
3146
January1st to 10thNight
331333335%6%69%
4097
11th to 20thNight
2213223347%70%
4110
21st to endNight
9%41422335%7%60%
4445
February1st to 10thNight
3413323346%68%
2280
11th to 20thNight
4413423245%68%
2218
21st to endNight
421433335%5%67%
1884
March1st to 10thNight
221222325%7%72%
3612
11th to 20thNight
3314334347%64%
3490
21st to endNight
421223336%8%68%
3828
April1st to 10thNight
221332335%5%71%
2085
11th to 20thNight
121222212381%
1879
21st to endNight
1111112135%84%
1734
May1st to 10thNight
11211112387%
2860
11th to 20thNight
11211113385%
2834
21st to endNight
11111292%
3110
June1st to 10thNight
111111213483%
1710
11th to 20thNight
111113388%
1710
21st to endNight
121112235%81%
1710
July1st to 10thNight
11222324481%
2860
11th to 20thNight
2113223346%72%
2860
21st to endNight
121232345%8%70%
3109
August1st to 10thNight
221323435%11%65%
2847
11th to 20thNight
213223235%77%
3033
21st to endNight
1112112245%81%
3498
September1st to 10thNight
211322335%6%71%
2085
11th to 20thNight
11112222386%
2090
21st to endNight
11212223482%
2090
October1st to 10thNight
2212223346%75%
2090
11th to 20thNight
111211212386%
2190
21st to endNight
1112112235%82%
2508
November1st to 10thNight
121322223478%
2367
11th to 20thNight
2213222245%76%
2470
21st to endNight
3313232245%71%
2470
December1st to 10thNight
4314333447%65%
2470
11th to 20thNight
3425%44435%7%58%
3041
21st to endNight
5%31333435%6%63%
4521

Transparency (when cloud cover <= 30%)
Color Meanings:
Too cloudy to forecast Poor Below Average Average Above average Transparent
MonthDays in MonthOccurrence of each ForecastData
Points
January1st to 10thDay
20%35%12%38%23%
2859
11th to 20thDay
17%35%23%34%18%
2860
21st to endDay
25%410%13%32%16%
3219
February1st to 10thDay
17%2413%27%37%
1900
11th to 20thDay
18%25%13%29%33%
1860
21st to endDay
18%35%16%28%32%
1570
March1st to 10thDay
10%2418%38%29%
3261
11th to 20thDay
16%5%7%18%29%24%
3490
21st to endDay
10%3416%43%24%
3825
April1st to 10thDay
13%2311%30%41%
2091
11th to 20thDay
9%128%26%53%
2252
21st to endDay
7%128%29%53%
2444
May1st to 10thDay
6%137%24%59%
4110
11th to 20thDay
6%235%19%66%
4074
21st to endDay
41415%75%
4477
June1st to 10thDay
7%12419%67%
2470
11th to 20thDay
41212%81%
2470
21st to endDay
8%236%9%73%
2470
July1st to 10thDay
8%335%10%72%
4046
11th to 20thDay
12%46%13%33%32%
4041
21st to endDay
17%6%7%16%20%35%
4314
August1st to 10thDay
19%5%9%24%21%22%
4078
11th to 20thDay
10%45%11%31%39%
3836
21st to endDay
10%249%22%52%
4179
September1st to 10thDay
19%35%11%21%41%
2095
11th to 20thDay
7%236%22%61%
2090
21st to endDay
10%338%17%60%
2090
October1st to 10thDay
11%2311%22%51%
2090
11th to 20thDay
6%128%22%60%
1990
21st to endDay
8%248%23%56%
2090
November1st to 10thDay
9%2312%30%44%
1730
11th to 20thDay
13%2312%26%45%
1710
21st to endDay
17%25%11%30%36%
1710
December1st to 10thDay
23%35%16%22%32%
1710
11th to 20thDay
22%5%8%20%26%19%
2168
21st to endDay
20%6%8%22%28%16%
3146
January1st to 10thNight
16%35%15%32%29%
4097
11th to 20thNight
15%25%23%36%20%
4110
21st to endNight
23%48%16%27%21%
4445
February1st to 10thNight
18%3412%25%38%
2280
11th to 20thNight
19%2414%23%38%
2219
21st to endNight
20%3411%26%36%
1884
March1st to 10thNight
12%3417%36%28%
3612
11th to 20thNight
17%5%6%15%30%27%
3490
21st to endNight
13%35%14%39%26%
3828
April1st to 10thNight
14%2410%27%42%
2085
11th to 20thNight
11%228%23%54%
1879
21st to endNight
6%139%24%57%
1734
May1st to 10thNight
6%126%22%64%
2860
11th to 20thNight
6%22416%70%
2835
21st to endNight
31414%77%
3110
June1st to 10thNight
8%11419%67%
1710
11th to 20thNight
412311%80%
1710
21st to endNight
7%135%9%75%
1710
July1st to 10thNight
8%24410%73%
2815
11th to 20thNight
12%4412%35%33%
2806
21st to endNight
11%47%18%24%36%
3011
August1st to 10thNight
14%46%24%26%26%
2838
11th to 20thNight
11%3411%27%44%
3060
21st to endNight
7%248%25%54%
3498
September1st to 10thNight
12%46%13%20%45%
2085
11th to 20thNight
6%237%20%64%
2090
21st to endNight
7%338%16%62%
2090
October1st to 10thNight
12%35%10%18%53%
2090
11th to 20thNight
7%118%19%64%
2190
21st to endNight
7%148%19%61%
2508
November1st to 10thNight
12%129%25%50%
2367
11th to 20thNight
13%1210%25%49%
2470
21st to endNight
17%2311%27%40%
2470
December1st to 10thNight
19%35%15%21%37%
2470
11th to 20thNight
24%46%14%27%26%
3041
21st to endNight
21%46%18%32%19%
4521

Seeing (when cloud cover <= 80%)
Color Meanings:
Too cloudy to forecast Bad 1/5 Poor 2/5 Average 3/5 Good 4/5 Excellent 5/5
MonthDays in MonthOccurrence of each ForecastData
Points
January1st to 10thDay
6%5%26%36%23%4
270
11th to 20thDay
8%315%39%29%7%
270
21st to endDay
37%27%28%25%8%
344
February1st to 10thDay
6%8%27%29%23%8%
460
11th to 20thDay
6%10%26%34%22%2
455
21st to endDay
5%11%30%37%15%1
382
March1st to 10thDay
412%26%39%17%2
460
11th to 20thDay
6%8%22%31%27%7%
460
21st to endDay
412%30%35%15%3
506
April1st to 10thDay
38%23%33%25%7%
460
11th to 20thDay
310%30%32%18%7%
452
21st to endDay
18%27%29%24%11%
460
May1st to 10thDay
1421%35%29%10%
463
11th to 20thDay
2323%34%27%11%
488
21st to endDay
2420%38%26%10%
529
June1st to 10thDay
1212%36%37%11%
490
11th to 20thDay
1216%35%32%14%
490
21st to endDay
1111%37%37%13%
490
July1st to 10thDay
5%39%40%15%
486
11th to 20thDay
2228%45%22%
484
21st to endDay
31422%44%26%
531
August1st to 10thDay
2329%45%21%
487
11th to 20thDay
3425%45%23%
477
21st to endDay
31328%42%24%
539
September1st to 10thDay
238%28%41%17%
490
11th to 20thDay
2110%38%34%14%
490
21st to endDay
1215%34%33%14%
490
October1st to 10thDay
2316%35%32%12%
490
11th to 20thDay
2215%35%35%11%
390
21st to endDay
1317%29%35%14%
330
November1st to 10thDay
3312%43%32%8%
273
11th to 20thDay
2413%37%34%10%
270
21st to endDay
4323%34%26%11%
270
December1st to 10thDay
5%316%41%27%9%
270
11th to 20thDay
2222%39%30%5%
270
21st to endDay
8%8%25%32%22%4
297
January1st to 10thNight
5%216%43%28%7%
760
11th to 20thNight
5%316%39%32%5%
760
21st to endNight
6%320%42%25%3
836
February1st to 10thNight
5%418%39%29%5%
760
11th to 20thNight
5%422%42%24%4
744
21st to endNight
5%5%24%43%20%4
628
March1st to 10thNight
4425%44%20%3
760
11th to 20thNight
4420%37%28%8%
760
21st to endNight
36%25%40%23%4
836
April1st to 10thNight
3422%43%25%4
760
11th to 20thNight
25%26%40%23%4
751
21st to endNight
1424%43%25%4
594
May1st to 10thNight
1422%45%26%2
570
11th to 20thNight
1220%42%31%3
561
21st to endNight
1217%50%26%4
617
June1st to 10thNight
1111%48%36%3
570
11th to 20thNight
112%48%37%2
570
21st to endNight
17%43%44%5%
570
July1st to 10thNight
2239%53%4
555
11th to 20thNight
21327%62%5%
552
21st to endNight
2328%58%8%
624
August1st to 10thNight
2327%61%7%
567
11th to 20thNight
31324%58%11%
695
21st to endNight
2325%58%11%
836
September1st to 10thNight
215%30%54%8%
760
11th to 20thNight
116%35%48%9%
760
21st to endNight
110%37%43%8%
760
October1st to 10thNight
3112%40%40%4
760
11th to 20thNight
1111%43%38%6%
760
21st to endNight
1312%39%36%11%
836
November1st to 10thNight
1113%44%33%8%
744
11th to 20thNight
3111%39%37%9%
760
21st to endNight
4217%40%31%6%
760
December1st to 10thNight
6%214%42%32%4
760
11th to 20thNight
5%316%44%29%3
760
21st to endNight
5%320%43%24%5%
836
Page generated at 2024-10-29 22:22:59. Version ac07

Copyright © 2024 Attilla Danko.


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