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 2024-03-08.

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%
24600
39%
79455
33%
24523
82%
24523
59%
34161

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
71%
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
64%
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%
750
36%
2176
29%
750
75%
750
56%
1030
March11th to 20thNight
68%
720
40%
1980
31%
720
78%
720
62%
933
March21st to endNight
63%
792
38%
2178
26%
792
74%
792
60%
1038
April1st to 10thNight
67%
720
35%
1976
22%
720
75%
720
61%
926
April11th to 20thNight
62%
711
41%
1779
21%
711
73%
711
69%
844
April21st to endNight
69%
563
49%
1643
31%
563
81%
563
77%
656
May1st to 10thNight
71%
540
44%
1620
31%
540
79%
540
71%
653
May11th to 20thNight
74%
531
43%
1594
30%
531
81%
531
73%
641
May21st to endNight
78%
582
41%
1746
30%
582
84%
582
81%
655
June1st to 10thNight
84%
540
38%
1620
32%
540
85%
540
77%
631
June11th to 20thNight
86%
540
41%
1620
34%
540
88%
540
85%
591
June21st to endNight
88%
540
37%
1620
33%
540
89%
540
79%
624
July1st to 10thNight
93%
525
33%
1575
28%
525
93%
525
65%
682
July11th to 20thNight
86%
522
32%
1566
27%
522
86%
522
54%
741
July21st to endNight
84%
591
33%
1674
27%
558
85%
558
51%
826
August1st to 10thNight
89%
537
39%
1602
32%
534
89%
534
64%
697
August11th to 20thNight
89%
658
38%
1726
28%
658
89%
658
64%
852
August21st to endNight
88%
792
40%
1980
30%
792
88%
792
68%
969
September1st to 10thNight
85%
720
36%
1975
31%
720
86%
720
63%
940
September11th to 20thNight
89%
720
47%
1980
42%
720
91%
720
79%
826
September21st to endNight
85%
720
44%
1980
36%
720
90%
720
75%
854
October1st to 10thNight
78%
720
42%
1980
34%
720
84%
720
65%
909
October11th to 20thNight
84%
720
48%
2074
42%
720
90%
720
78%
837
October21st to endNight
81%
792
47%
2376
41%
792
88%
792
75%
929
November1st to 10thNight
79%
740
42%
2355
40%
740
85%
740
66%
959
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
76%
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
2212323346%72%
79030
Night
3212323346%72%
80608
TransparencyDay
14%35%12%25%42%
78757
Night
14%3412%25%42%
80403
SeeingDay
3417%33%31%11%
14326
Night
3214%39%36%6%
24652

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
342442335%6%66%
2858
11th to 20thDay
331332345%6%68%
2860
21st to endDay
8%41442345%8%56%
3219
February1st to 10thDay
3313323346%70%
1900
11th to 20thDay
322332335%8%65%
1850
21st to endDay
3313323336%69%
1570
March1st to 10thDay
321332245%9%67%
1943
11th to 20thDay
3212323347%70%
1980
21st to endDay
221232333475%
2178
April1st to 10thDay
12122235%47%72%
1980
11th to 20thDay
2212112235%80%
2129
21st to endDay
111111235%82%
2315
May1st to 10thDay
1112212335%80%
2340
11th to 20thDay
111111222484%
2301
21st to endDay
111111112386%
2530
June1st to 10thDay
111111222484%
2340
11th to 20thDay
11111112390%
2340
21st to endDay
111221223383%
2340
July1st to 10thDay
1212323445%73%
2340
11th to 20thDay
21134345%6%7%63%
2340
21st to endDay
5%4245%36%6%7%9%50%
2545
August1st to 10thDay
2213424448%65%
2328
11th to 20thDay
221232346%8%66%
2172
21st to endDay
32123245%5%6%68%
2376
September1st to 10thDay
3323323446%66%
1985
11th to 20thDay
21121122484%
1980
21st to endDay
121222322478%
1980
October1st to 10thDay
2112223335%77%
1980
11th to 20thDay
211123484%
1886
21st to endDay
111211124483%
1980
November1st to 10thDay
111213336%78%
1720
11th to 20thDay
1212223345%75%
1710
21st to endDay
3313323347%69%
1710
December1st to 10thDay
3423334347%63%
1710
11th to 20thDay
23245%345%7%7%59%
2169
21st to endDay
5%42442447%7%58%
3146
January1st to 10thNight
331232345%6%69%
4097
11th to 20thNight
2212323447%70%
4110
21st to endNight
9%41431335%7%60%
4445
February1st to 10thNight
3323323346%69%
2280
11th to 20thNight
4313423345%68%
2218
21st to endNight
421432345%5%67%
1884
March1st to 10thNight
321243335%7%66%
2176
11th to 20thNight
3212313446%71%
1980
21st to endNight
2222323446%70%
2178
April1st to 10thNight
221332345%5%71%
1976
11th to 20thNight
121221222380%
1779
21st to endNight
1112235%83%
1643
May1st to 10thNight
112312235%81%
1620
11th to 20thNight
111211222483%
1594
21st to endNight
11211112288%
1746
June1st to 10thNight
111111223484%
1620
11th to 20thNight
111123388%
1620
21st to endNight
1111111235%81%
1620
July1st to 10thNight
11231345%6%73%
1620
11th to 20thNight
22133335%5%7%65%
1620
21st to endNight
22235%246%7%9%57%
1773
August1st to 10thNight
2112214347%73%
1611
11th to 20thNight
213323447%71%
1726
21st to endNight
211232345%7%71%
1980
September1st to 10thNight
211231345%6%71%
1975
11th to 20thNight
11111122385%
1980
21st to endNight
11221233481%
1980
October1st to 10thNight
2112213346%74%
1980
11th to 20thNight
111121122385%
2074
21st to endNight
1111111235%82%
2376
November1st to 10thNight
111322323478%
2355
11th to 20thNight
2213312245%76%
2470
21st to endNight
3313323345%71%
2470
December1st to 10thNight
4313323447%65%
2470
11th to 20thNight
3425%5%3445%7%58%
3041
21st to endNight
5%31332445%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
16%2414%29%34%
1943
11th to 20thDay
16%3411%27%39%
1980
21st to endDay
15%2312%32%36%
2178
April1st to 10thDay
13%2312%30%40%
1980
11th to 20thDay
9%138%27%52%
2132
21st to endDay
7%128%29%52%
2315
May1st to 10thDay
10%239%25%52%
2340
11th to 20thDay
7%236%22%60%
2304
21st to endDay
7%126%22%62%
2530
June1st to 10thDay
7%12419%67%
2340
11th to 20thDay
41212%80%
2340
21st to endDay
9%125%9%74%
2340
July1st to 10thDay
12%45%8%14%58%
2276
11th to 20thDay
17%5%8%18%24%27%
2271
21st to endDay
25%9%11%19%17%21%
2404
August1st to 10thDay
17%46%14%22%37%
2313
11th to 20thDay
14%5%7%14%27%32%
2172
21st to endDay
15%36%14%26%36%
2376
September1st to 10thDay
20%36%11%21%39%
1985
11th to 20thDay
7%236%22%60%
1980
21st to endDay
11%338%17%58%
1980
October1st to 10thDay
12%2312%23%48%
1980
11th to 20thDay
7%128%22%60%
1886
21st to endDay
8%248%24%55%
1980
November1st to 10thDay
9%2312%30%44%
1720
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
17%3413%29%34%
2176
11th to 20thNight
14%3412%25%41%
1980
21st to endNight
16%25%11%30%36%
2178
April1st to 10thNight
14%2410%27%41%
1976
11th to 20thNight
11%228%24%52%
1779
21st to endNight
7%139%24%56%
1643
May1st to 10thNight
9%238%26%53%
1620
11th to 20thNight
9%126%23%59%
1595
21st to endNight
6%126%25%61%
1746
June1st to 10thNight
8%11418%68%
1620
11th to 20thNight
412311%79%
1620
21st to endNight
7%1349%77%
1620
July1st to 10thNight
13%25%8%14%58%
1575
11th to 20thNight
16%5%7%18%23%30%
1566
21st to endNight
18%6%11%21%18%25%
1674
August1st to 10thNight
11%45%13%24%43%
1602
11th to 20thNight
13%46%15%28%34%
1726
21st to endNight
12%37%14%27%37%
1980
September1st to 10thNight
13%46%13%21%43%
1975
11th to 20thNight
6%237%21%62%
1980
21st to endNight
8%339%17%61%
1980
October1st to 10thNight
12%35%10%19%51%
1980
11th to 20thNight
7%128%18%64%
2074
21st to endNight
8%148%19%60%
2376
November1st to 10thNight
12%129%25%50%
2355
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%40%17%2
449
11th to 20thDay
5%8%22%32%27%7%
420
21st to endDay
412%30%34%16%4
462
April1st to 10thDay
37%25%34%25%7%
420
11th to 20thDay
410%29%32%18%7%
412
21st to endDay
18%27%30%23%11%
420
May1st to 10thDay
1421%35%29%9%
423
11th to 20thDay
2322%35%27%11%
448
21st to endDay
2421%38%25%10%
485
June1st to 10thDay
2313%37%36%9%
450
11th to 20thDay
1116%35%32%15%
450
21st to endDay
1110%37%36%14%
450
July1st to 10thDay
5%39%41%15%
446
11th to 20thDay
2227%46%22%
444
21st to endDay
41422%44%26%
487
August1st to 10thDay
2330%45%20%
447
11th to 20thDay
3423%46%24%
437
21st to endDay
3228%43%24%
495
September1st to 10thDay
338%26%41%18%
450
11th to 20thDay
28%38%36%15%
450
21st to endDay
2215%34%34%14%
450
October1st to 10thDay
2318%36%30%11%
450
11th to 20thDay
1215%35%35%11%
356
21st to endDay
1318%29%36%13%
297
November1st to 10thDay
3312%43%32%7%
270
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
750
11th to 20thNight
4420%36%29%8%
720
21st to endNight
27%24%39%24%4
792
April1st to 10thNight
2422%43%25%4
720
11th to 20thNight
25%26%39%24%4
711
21st to endNight
1424%42%26%4
563
May1st to 10thNight
1422%44%27%2
540
11th to 20thNight
1219%42%32%3
531
21st to endNight
1317%48%27%4
584
June1st to 10thNight
1111%47%36%3
540
11th to 20thNight
111%48%38%3
540
21st to endNight
17%42%45%5%
540
July1st to 10thNight
2138%55%4
525
11th to 20thNight
21325%64%5%
522
21st to endNight
21326%60%8%
591
August1st to 10thNight
2327%61%7%
537
11th to 20thNight
3324%58%11%
658
21st to endNight
2325%58%11%
792
September1st to 10thNight
216%28%55%8%
720
11th to 20thNight
116%33%50%10%
720
21st to endNight
211%36%44%8%
720
October1st to 10thNight
3213%41%38%4
720
11th to 20thNight
1111%43%38%6%
720
21st to endNight
1312%39%35%11%
792
November1st to 10thNight
1113%44%33%8%
740
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 2024-03-05 05:24:05. Version ac07

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