Albany
Clear Sky Chart
History

This sumarizes the distribution of each different forecast outcome for the Albany 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
46%
22884
12%
80781
13%
22791
49%
22791
17%
58183

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
23%
754
3%
4405
4%
736
25%
736
3%
3922
January11th to 20thNight
30%
757
7%
4403
8%
740
32%
740
5%
3719
January21st to endNight
36%
833
6%
4515
12%
814
38%
814
6%
3843
February1st to 10thNight
33%
760
6%
2470
7%
760
33%
760
9%
2058
February11th to 20thNight
34%
740
8%
2404
7%
740
37%
740
12%
1886
February21st to endNight
32%
628
11%
1970
8%
628
35%
628
11%
1560
March1st to 10thNight
35%
750
8%
2128
7%
750
36%
750
13%
1716
March11th to 20thNight
40%
720
11%
1980
8%
720
42%
720
16%
1531
March21st to endNight
32%
792
6%
2152
4%
792
33%
792
11%
1784
April1st to 10thNight
33%
720
8%
1800
4%
720
34%
720
14%
1471
April11th to 20thNight
42%
711
11%
1779
5%
711
43%
711
20%
1355
April21st to endNight
43%
543
11%
1623
7%
543
46%
543
18%
1157
May1st to 10thNight
45%
443
14%
1523
12%
443
50%
443
23%
968
May11th to 20thNight
50%
354
13%
1416
16%
354
53%
354
17%
917
May21st to endNight
52%
389
9%
1552
12%
388
56%
388
17%
1005
June1st to 10thNight
54%
360
10%
1440
14%
360
57%
360
20%
895
June11th to 20thNight
51%
360
10%
1440
15%
360
55%
360
22%
860
June21st to endNight
66%
360
17%
1440
25%
360
72%
360
37%
668
July1st to 10thNight
76%
350
20%
1400
30%
350
80%
350
49%
576
July11th to 20thNight
68%
348
27%
1392
32%
348
81%
348
48%
567
July21st to endNight
84%
425
34%
1518
44%
402
89%
402
73%
501
August1st to 10thNight
84%
537
28%
1602
26%
534
86%
534
61%
700
August11th to 20thNight
84%
534
32%
1602
27%
534
85%
534
60%
722
August21st to endNight
73%
716
36%
1904
22%
716
76%
716
56%
977
September1st to 10thNight
73%
720
32%
1800
19%
720
75%
720
57%
960
September11th to 20thNight
69%
720
26%
1816
18%
720
71%
720
40%
1115
September21st to endNight
65%
720
24%
2056
21%
720
66%
720
36%
1225
October1st to 10thNight
55%
720
16%
2160
16%
720
58%
720
29%
1370
October11th to 20thNight
56%
720
18%
2160
21%
720
58%
720
26%
1430
October21st to endNight
42%
792
16%
2380
15%
792
46%
792
20%
1683
November1st to 10thNight
38%
740
11%
2500
12%
740
40%
740
12%
1924
November11th to 20thNight
33%
760
7%
2660
8%
760
35%
760
10%
2138
November21st to endNight
40%
760
8%
2660
7%
760
42%
760
13%
1998
December1st to 10thNight
37%
760
10%
2660
9%
760
39%
760
12%
2037
December11th to 20thNight
29%
759
5%
3233
6%
759
29%
759
6%
2713
December21st to endNight
24%
829
3%
4838
5%
817
25%
817
3%
4232

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
20%8%37%6%34446%34%
78537
Night
22%9%47%5%34445%33%
81052
TransparencyDay
51%8%12%16%11%3
78242
Night
52%8%12%16%10%3
80868
SeeingDay
18%9%20%27%21%6%
13771
Night
21%6%18%33%21%2
22908

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
38%14%6%12%7%343337%
2539
11th to 20thDay
41%12%5%8%6%3433314%
2541
21st to endDay
33%11%5%11%7%35%45%5%12%
3146
February1st to 10thDay
29%12%5%9%8%36%5%5%6%14%
1710
11th to 20thDay
28%12%5%8%8%45%445%18%
1665
21st to endDay
29%13%5%10%6%4443418%
1484
March1st to 10thDay
27%11%5%9%8%35%6%5%5%15%
1988
11th to 20thDay
28%10%38%7%35%446%21%
1980
21st to endDay
26%12%5%8%8%46%5%5%416%
2204
April1st to 10thDay
26%12%49%7%45%45%6%18%
2160
11th to 20thDay
24%10%46%6%36%45%6%26%
2129
21st to endDay
21%8%37%7%35%46%7%29%
2334
May1st to 10thDay
16%7%36%6%45%5%5%7%37%
2434
11th to 20thDay
19%8%36%6%445%5%7%32%
2477
21st to endDay
20%7%36%5%45%6%6%8%32%
2723
June1st to 10thDay
20%7%46%5%25%45%6%36%
2520
11th to 20thDay
17%6%36%7%35%5%6%8%34%
2520
21st to endDay
9%424324446%57%
2520
July1st to 10thDay
5%313423345%67%
2520
11th to 20thDay
6%212323335%69%
2520
21st to endDay
421121223477%
2706
August1st to 10thDay
3313323348%68%
2328
11th to 20thDay
3313322436%70%
2298
21st to endDay
5%3133235%48%62%
2450
September1st to 10thDay
6%313222336%69%
2160
11th to 20thDay
11%7%26%6%2445%7%46%
2142
21st to endDay
15%6%346%33445%46%
1904
October1st to 10thDay
16%7%36%435%45%6%40%
1800
11th to 20thDay
18%9%5%8%6%45%447%30%
1800
21st to endDay
24%10%47%6%34445%28%
1975
November1st to 10thDay
30%11%5%9%7%35%44416%
1578
11th to 20thDay
30%11%5%8%6%44446%17%
1520
21st to endDay
27%10%5%10%7%45%45%5%19%
1520
December1st to 10thDay
26%9%6%11%7%3445%5%21%
1520
11th to 20thDay
28%11%5%11%9%5%5%6%6%5%9%
1928
21st to endDay
32%14%6%14%10%443346%
2794
January1st to 10thNight
34%16%6%9%7%3443310%
4406
11th to 20thNight
39%13%47%5%3433415%
4416
21st to endNight
37%12%5%9%5%3433414%
4521
February1st to 10thNight
27%12%49%7%45%446%17%
2470
11th to 20thNight
27%10%47%6%34445%25%
2402
21st to endNight
29%10%47%6%3445%6%22%
1970
March1st to 10thNight
25%12%48%6%45%5%5%5%22%
2128
11th to 20thNight
24%9%37%6%35%47%8%25%
1980
21st to endNight
26%11%49%7%45%446%20%
2152
April1st to 10thNight
29%10%37%6%34445%24%
1800
11th to 20thNight
22%8%36%5%35%45%6%33%
1779
21st to endNight
21%7%36%5%3445%8%34%
1623
May1st to 10thNight
14%7%37%6%3345%6%42%
1523
11th to 20thNight
15%7%37%7%35%46%7%36%
1416
21st to endNight
16%7%35%5%36%46%9%36%
1552
June1st to 10thNight
16%6%25%4245%5%8%42%
1440
11th to 20thNight
13%6%26%7%35%45%7%43%
1440
21st to endNight
6%5%24323345%63%
1440
July1st to 10thNight
5%213312235%72%
1440
11th to 20thNight
5%312212335%72%
1440
21st to endNight
31121123384%
1607
August1st to 10thNight
3212212336%73%
1611
11th to 20thNight
3212323335%74%
1602
21st to endNight
6%312222346%70%
1904
September1st to 10thNight
6%312323335%70%
1800
11th to 20thNight
8%424445%5%5%6%54%
1816
21st to endNight
10%5%25%5%3345%7%53%
2056
October1st to 10thNight
15%6%26%5%34445%46%
2160
11th to 20thNight
16%6%25%6%445%47%40%
2160
21st to endNight
22%8%35%5%34445%37%
2380
November1st to 10thNight
27%9%47%6%45%5%5%6%24%
2500
11th to 20thNight
31%9%47%6%35%445%22%
2660
21st to endNight
23%8%39%6%45%5%5%5%26%
2660
December1st to 10thNight
28%8%48%6%24446%24%
2660
11th to 20thNight
28%10%410%8%5%6%5%5%414%
3276
21st to endNight
28%13%7%13%9%45%44410%
4862

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
79%11%5%311
2539
11th to 20thDay
77%6%6%7%22
2541
21st to endDay
71%11%8%6%4
3146
February1st to 10thDay
70%8%9%8%4
1710
11th to 20thDay
68%9%9%9%41
1674
21st to endDay
70%7%7%9%5%2
1484
March1st to 10thDay
67%9%11%9%4
1988
11th to 20thDay
62%7%12%13%5%1
1980
21st to endDay
70%10%10%9%2
2204
April1st to 10thDay
66%9%11%10%4
2160
11th to 20thDay
59%9%11%13%6%3
2132
21st to endDay
55%9%14%12%8%1
2334
May1st to 10thDay
46%8%16%20%9%1
2434
11th to 20thDay
50%9%14%18%7%1
2480
21st to endDay
51%9%18%19%3
2724
June1st to 10thDay
50%6%19%20%5%1
2520
11th to 20thDay
47%9%21%17%5%
2520
21st to endDay
29%6%18%30%13%4
2520
July1st to 10thDay
20%6%15%28%24%6%
2451
11th to 20thDay
20%49%26%32%9%
2445
21st to endDay
12%29%32%37%8%
2555
August1st to 10thDay
16%6%16%34%22%6%
2312
11th to 20thDay
17%5%14%33%25%6%
2298
21st to endDay
20%7%13%30%26%4
2450
September1st to 10thDay
19%412%30%22%12%
2160
11th to 20thDay
36%8%12%21%15%7%
2142
21st to endDay
39%7%13%19%16%6%
1904
October1st to 10thDay
43%7%11%19%15%4
1800
11th to 20thDay
53%8%12%13%12%2
1800
21st to endDay
59%8%8%12%12%2
1975
November1st to 10thDay
70%8%10%9%4
1578
11th to 20thDay
68%8%10%7%6%2
1520
21st to endDay
66%7%8%7%11%1
1520
December1st to 10thDay
65%8%9%9%9%1
1520
11th to 20thDay
71%12%8%8%1
1928
21st to endDay
78%11%6%32
2794
January1st to 10thNight
77%8%7%331
4406
11th to 20thNight
74%6%6%10%31
4416
21st to endNight
71%8%7%8%5%1
4521
February1st to 10thNight
66%10%10%10%41
2470
11th to 20thNight
60%8%13%10%6%2
2404
21st to endNight
62%8%12%11%6%2
1970
March1st to 10thNight
61%8%11%13%6%
2128
11th to 20thNight
54%10%14%15%5%1
1980
21st to endNight
64%9%14%12%2
2152
April1st to 10thNight
62%7%13%12%6%
1800
11th to 20thNight
51%9%17%14%6%3
1779
21st to endNight
50%7%17%17%6%3
1623
May1st to 10thNight
42%7%17%24%8%2
1523
11th to 20thNight
45%8%18%20%5%3
1416
21st to endNight
43%10%21%21%5%
1552
June1st to 10thNight
41%9%19%27%41
1440
11th to 20thNight
39%7%24%23%7%
1440
21st to endNight
24%5%20%34%13%4
1440
July1st to 10thNight
17%416%30%26%8%
1400
11th to 20thNight
16%412%25%33%10%
1392
21st to endNight
7%28%34%38%11%
1518
August1st to 10thNight
12%416%40%21%6%
1602
11th to 20thNight
15%314%38%23%7%
1602
21st to endNight
17%5%9%38%24%6%
1904
September1st to 10thNight
18%5%12%31%24%11%
1800
11th to 20thNight
29%7%14%26%15%9%
1816
21st to endNight
32%6%15%22%17%8%
2056
October1st to 10thNight
38%6%10%24%17%4
2160
11th to 20thNight
41%8%14%19%14%4
2160
21st to endNight
48%8%12%13%16%3
2380
November1st to 10thNight
58%9%11%15%7%
2500
11th to 20thNight
64%8%10%9%7%2
2660
21st to endNight
56%9%10%11%12%3
2660
December1st to 10thNight
60%7%11%12%9%1
2660
11th to 20thNight
66%11%10%9%4
3276
21st to endNight
72%12%8%6%2
4862

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
41%14%18%14%11%2
180
11th to 20thDay
32%14%15%24%11%4
181
21st to endDay
31%12%18%20%15%5%
407
February1st to 10thDay
30%9%22%21%14%4
370
11th to 20thDay
29%10%25%21%10%4
365
21st to endDay
24%18%23%21%11%3
341
March1st to 10thDay
27%13%24%25%9%2
449
11th to 20thDay
26%12%22%22%16%2
420
21st to endDay
25%15%24%23%11%2
462
April1st to 10thDay
29%13%20%21%14%4
420
11th to 20thDay
25%15%24%21%9%5%
412
21st to endDay
20%12%25%26%16%2
420
May1st to 10thDay
14%11%26%27%17%5%
423
11th to 20thDay
24%9%19%23%19%7%
448
21st to endDay
13%7%21%27%22%10%
485
June1st to 10thDay
19%8%18%27%24%4
450
11th to 20thDay
15%9%24%34%16%2
450
21st to endDay
5%5%15%38%30%7%
450
July1st to 10thDay
6%215%36%31%9%
446
11th to 20thDay
3320%36%30%9%
444
21st to endDay
3213%38%35%10%
487
August1st to 10thDay
2113%32%38%13%
447
11th to 20thDay
328%37%37%14%
437
21st to endDay
4318%36%32%8%
495
September1st to 10thDay
6%420%33%30%8%
450
11th to 20thDay
11%416%29%29%10%
450
21st to endDay
15%6%20%31%21%6%
450
October1st to 10thDay
17%7%21%25%22%8%
450
11th to 20thDay
18%8%18%24%25%8%
450
21st to endDay
25%12%22%22%14%6%
490
November1st to 10thDay
25%12%27%20%13%4
224
11th to 20thDay
23%12%25%19%15%6%
180
21st to endDay
29%11%19%18%16%6%
180
December1st to 10thDay
27%17%14%23%13%6%
180
11th to 20thDay
37%7%21%22%11%3
180
21st to endDay
33%14%18%20%14%1
198
January1st to 10thNight
35%10%20%21%12%2
760
11th to 20thNight
33%10%17%20%17%3
760
21st to endNight
30%5%16%31%16%3
836
February1st to 10thNight
28%8%18%27%17%2
760
11th to 20thNight
27%7%20%28%16%1
744
21st to endNight
27%10%22%26%14%
628
March1st to 10thNight
27%7%22%30%14%
750
11th to 20thNight
24%8%18%32%16%1
720
21st to endNight
28%8%22%28%14%1
792
April1st to 10thNight
30%6%20%26%18%1
720
11th to 20thNight
22%7%22%31%17%1
711
21st to endNight
22%420%35%18%1
543
May1st to 10thNight
12%6%25%37%19%2
443
11th to 20thNight
17%216%38%27%1
354
21st to endNight
16%419%37%22%2
389
June1st to 10thNight
17%416%41%22%
360
11th to 20thNight
12%5%21%46%15%1
360
21st to endNight
7%118%53%21%
360
July1st to 10thNight
5%111%53%29%1
350
11th to 20thNight
4222%49%22%1
348
21st to endNight
2210%53%32%1
425
August1st to 10thNight
318%43%41%5%
537
11th to 20thNight
415%42%46%2
534
21st to endNight
5%215%44%32%2
716
September1st to 10thNight
7%215%45%32%1
720
11th to 20thNight
8%311%38%33%7%
720
21st to endNight
11%315%39%29%3
720
October1st to 10thNight
14%320%34%27%3
720
11th to 20thNight
17%5%14%34%26%5%
720
21st to endNight
24%6%20%29%17%4
792
November1st to 10thNight
25%7%19%31%17%1
740
11th to 20thNight
31%8%21%24%15%1
760
21st to endNight
23%8%18%30%18%3
760
December1st to 10thNight
26%7%18%29%17%3
760
11th to 20thNight
31%9%21%22%17%1
760
21st to endNight
35%8%21%24%11%1
836
Page generated at 2024-03-05 04:23:59. Version ac07

Copyright © 2024 Attilla Danko.


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