Amboy Crater
Clear Sky Chart
History

This sumarizes the distribution of each different forecast outcome for the Amboy Crater clear sky chart from 2005-11-06 to 2024-01-15.

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%
24645
40%
74405
32%
24603
83%
24603
65%
31591

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
65%
757
36%
2457
30%
756
76%
756
52%
1108
January11th to 20thNight
72%
736
40%
2392
36%
736
83%
736
57%
1033
January21st to endNight
62%
792
43%
2430
33%
792
77%
792
53%
1139
February1st to 10thNight
69%
720
41%
2160
35%
720
81%
720
61%
962
February11th to 20thNight
66%
700
40%
2098
33%
700
78%
700
57%
954
February21st to endNight
60%
592
41%
1776
35%
592
73%
592
58%
794
March1st to 10thNight
62%
720
34%
2160
27%
720
76%
720
54%
991
March11th to 20thNight
67%
720
38%
2011
31%
720
77%
720
62%
921
March21st to endNight
60%
792
39%
2170
23%
792
74%
792
63%
988
April1st to 10thNight
62%
720
39%
1800
20%
720
74%
720
64%
875
April11th to 20thNight
60%
711
42%
1779
19%
711
71%
711
68%
831
April21st to endNight
65%
658
45%
1738
22%
658
76%
658
74%
750
May1st to 10thNight
67%
540
43%
1620
28%
540
76%
540
74%
623
May11th to 20thNight
70%
531
44%
1595
29%
531
79%
531
80%
595
May21st to endNight
67%
582
40%
1746
25%
582
77%
582
79%
638
June1st to 10thNight
80%
540
38%
1620
30%
540
84%
540
82%
594
June11th to 20thNight
83%
540
40%
1620
34%
540
86%
540
85%
589
June21st to endNight
82%
540
38%
1620
32%
540
85%
540
80%
615
July1st to 10thNight
95%
525
37%
1575
33%
525
96%
525
81%
602
July11th to 20thNight
90%
522
35%
1566
30%
522
91%
522
67%
667
July21st to endNight
85%
591
36%
1674
31%
558
86%
558
56%
781
August1st to 10thNight
89%
620
39%
1685
28%
617
90%
617
71%
748
August11th to 20thNight
94%
712
41%
1780
27%
712
94%
712
80%
808
August21st to endNight
92%
792
45%
1980
32%
792
92%
792
78%
905
September1st to 10thNight
89%
720
41%
1871
32%
720
90%
720
75%
856
September11th to 20thNight
90%
720
48%
1980
42%
720
94%
720
86%
788
September21st to endNight
86%
720
47%
1980
40%
720
92%
720
82%
805
October1st to 10thNight
78%
720
44%
1980
36%
720
86%
720
74%
855
October11th to 20thNight
83%
720
51%
1980
43%
720
91%
720
82%
794
October21st to endNight
79%
792
45%
2493
42%
792
88%
792
79%
901
November1st to 10thNight
80%
740
42%
2405
40%
740
89%
740
75%
883
November11th to 20thNight
81%
760
44%
2470
44%
760
89%
760
69%
947
November21st to endNight
71%
760
42%
2470
39%
760
80%
760
61%
1011
December1st to 10thNight
72%
760
38%
2470
35%
760
80%
760
53%
1109
December11th to 20thNight
67%
758
37%
2895
34%
758
76%
758
43%
1289
December21st to endNight
61%
822
24%
4359
32%
817
72%
817
32%
1842

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
2112212346%77%
74896
Night
2212212346%76%
74919
TransparencyDay
11%25%12%25%45%
74623
Night
11%25%12%26%43%
74714
SeeingDay
37%19%34%30%8%
14317
Night
2316%40%34%4
24670

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
3312323248%69%
1708
11th to 20thDay
4313212337%71%
1656
21st to endDay
3213324446%69%
1924
February1st to 10thDay
4212223236%74%
1800
11th to 20thDay
221231345%7%71%
1750
21st to endDay
3212323335%72%
1480
March1st to 10thDay
3212223447%71%
1800
11th to 20thDay
3211322436%73%
1948
21st to endDay
1112212346%76%
2182
April1st to 10thDay
2212322337%73%
2160
11th to 20thDay
1111112235%83%
2129
21st to endDay
111112236%82%
2221
May1st to 10thDay
111111246%82%
2340
11th to 20thDay
11111225%85%
2301
21st to endDay
11121223484%
2530
June1st to 10thDay
11111123485%
2340
11th to 20thDay
1112489%
2340
21st to endDay
111111213384%
2340
July1st to 10thDay
21121234478%
2340
11th to 20thDay
211131335%6%73%
2340
21st to endDay
22234245%6%9%61%
2545
August1st to 10thDay
1112212435%77%
2240
11th to 20thDay
111222346%76%
2122
21st to endDay
2112212446%76%
2376
September1st to 10thDay
2111213345%78%
2088
11th to 20thDay
111112389%
1980
21st to endDay
11111222386%
1980
October1st to 10thDay
211222233480%
1980
11th to 20thDay
111113487%
1978
21st to endDay
1111123486%
1859
November1st to 10thDay
1112222235%80%
1674
11th to 20thDay
1112213345%78%
1710
21st to endDay
2112312435%76%
1710
December1st to 10thDay
431332345%8%65%
1710
11th to 20thDay
442432445%10%59%
2169
21st to endDay
6%3233245%6%6%59%
3146
January1st to 10thNight
3213323447%68%
2457
11th to 20thNight
221232335%7%72%
2392
21st to endNight
4314323345%70%
2430
February1st to 10thNight
3213212345%75%
2160
11th to 20thNight
4213323346%71%
2098
21st to endNight
2212322347%71%
1776
March1st to 10thNight
221222446%6%69%
2160
11th to 20thNight
2112323347%72%
2011
21st to endNight
1212213347%75%
2170
April1st to 10thNight
1212212346%75%
1800
11th to 20thNight
1112212345%79%
1779
21st to endNight
111112237%81%
1738
May1st to 10thNight
11112336%82%
1620
11th to 20thNight
11111236%85%
1594
21st to endNight
1111135%86%
1746
June1st to 10thNight
1111235%86%
1620
11th to 20thNight
111122389%
1620
21st to endNight
11111112387%
1620
July1st to 10thNight
1111223485%
1620
11th to 20thNight
12222335%8%72%
1620
21st to endNight
231332446%6%66%
1773
August1st to 10thNight
212212335%78%
1694
11th to 20thNight
111212345%81%
1780
21st to endNight
212111345%81%
1980
September1st to 10thNight
1211212245%79%
1871
11th to 20thNight
111122389%
1980
21st to endNight
11111122487%
1980
October1st to 10thNight
211111233480%
1980
11th to 20thNight
1111122388%
1980
21st to endNight
111123485%
2493
November1st to 10thNight
1111112235%82%
2405
11th to 20thNight
11221234480%
2470
21st to endNight
3112322336%74%
2470
December1st to 10thNight
4212323347%68%
2470
11th to 20thNight
332332446%10%60%
3041
21st to endNight
342442346%7%61%
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
17%47%21%36%16%
1709
11th to 20thDay
15%37%19%34%22%
1656
21st to endDay
17%37%18%33%22%
1924
February1st to 10thDay
15%25%15%31%33%
1800
11th to 20thDay
13%45%15%27%35%
1760
21st to endDay
15%35%16%32%29%
1480
March1st to 10thDay
13%35%15%31%32%
1800
11th to 20thDay
13%26%16%31%32%
1948
21st to endDay
10%3419%36%28%
2182
April1st to 10thDay
14%2414%29%37%
2160
11th to 20thDay
7%1310%30%49%
2132
21st to endDay
6%2311%30%47%
2221
May1st to 10thDay
7%2312%28%49%
2340
11th to 20thDay
6%238%26%56%
2304
21st to endDay
7%239%27%53%
2530
June1st to 10thDay
5%38%21%63%
2340
11th to 20thDay
32412%77%
2340
21st to endDay
8%1238%78%
2340
July1st to 10thDay
10%236%14%65%
2276
11th to 20thDay
13%35%9%24%47%
2271
21st to endDay
17%5%7%15%20%35%
2404
August1st to 10thDay
11%249%19%55%
2225
11th to 20thDay
10%26%8%23%51%
2122
21st to endDay
11%249%21%53%
2376
September1st to 10thDay
10%35%10%16%58%
2088
11th to 20thDay
4135%20%68%
1980
21st to endDay
7%136%20%63%
1980
October1st to 10thDay
9%2310%23%52%
1980
11th to 20thDay
5%248%25%57%
1978
21st to endDay
6%149%24%56%
1859
November1st to 10thDay
9%2314%30%43%
1674
11th to 20thDay
10%3413%29%42%
1710
21st to endDay
12%26%14%32%34%
1710
December1st to 10thDay
18%48%21%23%27%
1710
11th to 20thDay
22%310%24%28%14%
2168
21st to endDay
22%5%11%26%24%12%
3146
January1st to 10thNight
17%46%17%33%23%
2457
11th to 20thNight
14%46%17%32%28%
2392
21st to endNight
19%26%20%25%28%
2430
February1st to 10thNight
14%35%15%28%35%
2160
11th to 20thNight
15%3413%28%37%
2099
21st to endNight
14%35%14%29%34%
1776
March1st to 10thNight
16%36%16%29%30%
2160
11th to 20thNight
13%26%15%30%33%
2011
21st to endNight
11%36%16%33%31%
2170
April1st to 10thNight
12%35%14%32%35%
1800
11th to 20thNight
9%2312%28%46%
1779
21st to endNight
7%2311%29%48%
1738
May1st to 10thNight
6%25%11%31%45%
1620
11th to 20thNight
5%1310%28%53%
1595
21st to endNight
41310%34%47%
1746
June1st to 10thNight
4128%22%64%
1620
11th to 20thNight
4125%13%74%
1620
21st to endNight
6%1139%79%
1620
July1st to 10thNight
5%225%16%70%
1575
11th to 20thNight
11%36%8%24%48%
1566
21st to endNight
16%46%14%25%35%
1674
August1st to 10thNight
9%447%19%58%
1685
11th to 20thNight
7%2410%23%55%
1780
21st to endNight
8%238%22%58%
1980
September1st to 10thNight
9%35%8%17%58%
1871
11th to 20thNight
4135%19%68%
1980
21st to endNight
5%126%19%66%
1980
October1st to 10thNight
9%249%26%51%
1980
11th to 20thNight
5%126%24%62%
1980
21st to endNight
5%148%21%60%
2493
November1st to 10thNight
8%149%33%45%
2405
11th to 20thNight
9%2311%28%46%
2470
21st to endNight
14%2412%30%38%
2470
December1st to 10thNight
18%36%17%25%32%
2470
11th to 20thNight
19%48%18%32%19%
3041
21st to endNight
21%6%8%25%27%13%
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
7%10%25%36%19%3
270
11th to 20thDay
10%6%19%42%20%3
252
21st to endDay
312%30%33%20%3
406
February1st to 10thDay
5%10%25%34%21%5%
420
11th to 20thDay
5%15%26%37%15%3
415
21st to endDay
7%13%32%34%14%1
346
March1st to 10thDay
413%30%33%19%1
420
11th to 20thDay
411%26%35%20%3
420
21st to endDay
416%30%34%13%3
462
April1st to 10thDay
6%9%28%30%23%4
420
11th to 20thDay
217%28%32%16%5%
412
21st to endDay
216%24%28%21%9%
420
May1st to 10thDay
37%23%34%26%6%
423
11th to 20thDay
17%24%36%26%6%
448
21st to endDay
27%21%39%25%6%
485
June1st to 10thDay
2418%33%33%10%
450
11th to 20thDay
1414%36%35%10%
450
21st to endDay
215%35%37%11%
450
July1st to 10thDay
117%31%45%16%
446
11th to 20thDay
115%28%45%20%
444
21st to endDay
116%29%47%16%
487
August1st to 10thDay
218%31%43%15%
447
11th to 20thDay
16%31%42%19%
437
21st to endDay
26%29%47%16%
495
September1st to 10thDay
228%37%36%14%
450
11th to 20thDay
1113%36%39%10%
450
21st to endDay
2418%28%37%12%
450
October1st to 10thDay
2420%34%33%6%
450
11th to 20thDay
15%15%40%35%6%
448
21st to endDay
26%16%32%35%9%
297
November1st to 10thDay
1417%39%34%4
270
11th to 20thDay
3415%41%31%6%
270
21st to endDay
16%23%36%30%4
270
December1st to 10thDay
4419%48%23%2
270
11th to 20thDay
39%22%38%25%3
270
21st to endDay
7%8%28%37%18%2
297
January1st to 10thNight
3223%39%28%5%
760
11th to 20thNight
2318%48%25%4
736
21st to endNight
5%423%43%21%3
792
February1st to 10thNight
3319%45%24%5%
720
11th to 20thNight
46%19%46%22%3
704
21st to endNight
45%28%42%18%3
592
March1st to 10thNight
36%24%44%20%2
720
11th to 20thNight
36%21%38%27%5%
720
21st to endNight
28%27%39%22%2
792
April1st to 10thNight
28%23%43%22%3
720
11th to 20thNight
29%26%37%23%2
711
21st to endNight
18%25%38%24%3
658
May1st to 10thNight
16%24%44%24%1
540
11th to 20thNight
422%38%34%1
531
21st to endNight
8%23%39%28%3
584
June1st to 10thNight
413%49%32%1
540
11th to 20thNight
213%48%36%1
540
21st to endNight
1114%41%40%3
540
July1st to 10thNight
1238%55%4
525
11th to 20thNight
21334%56%4
522
21st to endNight
21430%60%3
591
August1st to 10thNight
21432%56%6%
620
11th to 20thNight
1227%62%8%
712
21st to endNight
3227%58%11%
792
September1st to 10thNight
215%31%55%7%
720
11th to 20thNight
17%44%43%6%
720
21st to endNight
228%36%46%7%
720
October1st to 10thNight
2216%42%36%3
720
11th to 20thNight
1311%42%37%6%
720
21st to endNight
1314%36%37%9%
792
November1st to 10thNight
1215%40%37%5%
740
11th to 20thNight
2310%45%33%8%
760
21st to endNight
4218%45%27%5%
760
December1st to 10thNight
5%217%47%26%3
760
11th to 20thNight
4319%45%26%3
760
21st to endNight
5%6%22%44%19%4
836
Page generated at 2024-01-11 19:33:52. Version ac07

Copyright 2024 Attilla Danko


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