Albany
Clear Sky Chart
History

This sumarizes the distribution of each different forecast outcome for the Albany clear sky chart from 2005-11-05 to 2018-02-13.

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
48%
15308
13%
48829
12%
15281
50%
15281
19%
34386

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 15thNight
29%
776
6%
2716
6%
776
31%
776
8%
2252
January16th to endNight
37%
832
9%
2766
10%
832
38%
832
12%
2151
February1st to 15thNight
38%
745
7%
2444
7%
745
39%
745
10%
1991
February16th to endNight
34%
632
10%
2008
8%
632
37%
632
12%
1567
March1st to 15thNight
34%
720
4%
2022
4%
720
34%
720
11%
1668
March16th to endNight
33%
768
6%
2094
4%
768
34%
768
12%
1733
April1st to 15thNight
35%
719
6%
1799
3%
719
36%
719
15%
1466
April16th to endNight
48%
602
11%
1682
7%
602
50%
602
20%
1221
May1st to 15thNight
47%
413
13%
1493
11%
413
52%
413
21%
945
May16th to endNight
51%
375
9%
1496
12%
374
53%
374
15%
998
June1st to 15thNight
53%
360
9%
1440
12%
360
56%
360
19%
915
June16th to endNight
60%
360
13%
1440
20%
360
63%
360
27%
782
July1st to 15thNight
74%
340
20%
1360
27%
340
81%
340
48%
560
July16th to endNight
81%
397
30%
1436
38%
374
88%
374
62%
522
August1st to 15thNight
84%
538
27%
1611
24%
535
86%
535
60%
716
August16th to endNight
77%
655
35%
1801
24%
655
80%
655
57%
892
September1st to 15thNight
78%
720
31%
1800
20%
720
79%
720
59%
953
September16th to endNight
68%
716
26%
1982
22%
716
69%
716
38%
1181
October1st to 15thNight
55%
720
17%
2160
17%
720
59%
720
28%
1397
October16th to endNight
47%
768
14%
2307
15%
768
48%
768
19%
1664
November1st to 15thNight
36%
760
8%
2600
8%
760
37%
760
10%
2104
November16th to endNight
38%
780
7%
2730
7%
780
39%
780
12%
2106
December1st to 15thNight
39%
780
10%
2730
10%
780
41%
780
13%
2075
December16th to endNight
27%
832
5%
2912
6%
832
28%
832
6%
2527

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
17%8%47%5%34445%33%
49230
Night
18%7%36%5%34445%36%
48999
Cloud CoverDay
20%8%36%5%24345%34%
49230
Night
21%7%35%424345%36%
49003
TransparencyDay
52%6%11%16%10%2
48904
Night
50%6%12%17%10%3
48830
SeeingDay
20%7%21%26%18%5%
6103
Night
22%316%32%22%2
15320

By Month

Percentage Cloud Cover NW (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 15thDay
30%12%6%10%7%4333314%
1552
16th to endDay
26%10%5%10%6%35%446%16%
1807
February1st to 15thDay
28%11%5%10%7%44235%14%
1685
16th to endDay
25%13%5%10%7%3443317%
1466
March1st to 15thDay
29%12%5%8%7%45%5%4413%
1935
16th to endDay
26%11%5%8%7%45%5%45%15%
2130
April1st to 15thDay
20%12%6%9%7%45%5%45%16%
2149
16th to endDay
19%8%48%6%36%5%46%24%
2277
May1st to 15thDay
15%8%37%6%34347%35%
2455
16th to endDay
17%8%46%7%445%5%7%28%
2615
June1st to 15thDay
17%8%47%6%34446%31%
2520
16th to endDay
10%7%25%5%35%45%7%42%
2520
July1st to 15thDay
4213323335%66%
2520
16th to endDay
6%21221223469%
2633
August1st to 15thDay
221242345%7%63%
2340
16th to endDay
4313323446%62%
2400
September1st to 15thDay
4413312236%65%
2160
16th to endDay
14%6%36%5%34446%41%
1977
October1st to 15thDay
16%8%37%5%35%447%33%
1800
16th to endDay
21%10%5%9%5%44435%24%
1916
November1st to 15thDay
29%12%5%9%6%345%46%11%
1589
16th to endDay
25%12%5%10%8%35%345%16%
1560
December1st to 15thDay
24%9%7%10%8%3444418%
1560
16th to endDay
31%12%6%10%6%35%4349%
1664
January1st to 15thNight
29%12%48%5%35%34417%
2716
16th to endNight
24%10%5%7%5%34445%24%
2766
February1st to 15thNight
24%11%46%5%45%5%5%5%20%
2432
16th to endNight
22%9%48%5%35%445%25%
2008
March1st to 15thNight
26%11%47%5%34445%22%
2022
16th to endNight
24%9%48%7%445%47%19%
2090
April1st to 15thNight
23%9%37%7%24445%25%
1799
16th to endNight
16%6%26%6%35%45%8%35%
1682
May1st to 15thNight
10%6%36%5%3336%6%41%
1493
16th to endNight
15%8%36%5%3445%8%35%
1496
June1st to 15thNight
13%6%35%334447%41%
1440
16th to endNight
7%6%145%2345%7%51%
1440
July1st to 15thNight
2212212335%71%
1440
16th to endNight
3111123380%
1533
August1st to 15thNight
2111212336%73%
1620
16th to endNight
422211235%71%
1801
September1st to 15thNight
311221233472%
1800
16th to endNight
9%32332435%7%53%
1982
October1st to 15thNight
13%5%25%424445%46%
2160
16th to endNight
20%7%35%6%34445%35%
2307
November1st to 15thNight
27%8%37%7%35%5%5%6%20%
2600
16th to endNight
23%9%37%6%35%445%25%
2730
December1st to 15thNight
24%10%5%6%5%2345%5%26%
2730
16th to endNight
28%11%5%10%7%4443414%
2912

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 15thDay
36%10%6%10%5%3423314%
1552
16th to endDay
30%9%49%6%34445%17%
1807
February1st to 15thDay
31%13%5%7%7%3434414%
1685
16th to endDay
30%12%6%8%5%3433417%
1466
March1st to 15thDay
33%11%47%7%35%44412%
1935
16th to endDay
30%11%47%6%35%445%16%
2130
April1st to 15thDay
26%11%48%6%35%446%17%
2149
16th to endDay
23%8%36%6%35%45%6%25%
2277
May1st to 15thDay
19%7%36%6%34346%36%
2455
16th to endDay
22%7%25%5%345%5%7%29%
2615
June1st to 15thDay
20%7%46%5%2435%5%32%
2520
16th to endDay
14%5%24424447%43%
2520
July1st to 15thDay
5%21231323467%
2520
16th to endDay
7%21221222470%
2633
August1st to 15thDay
3312313447%64%
2340
16th to endDay
5%312323436%64%
2400
September1st to 15thDay
6%412212226%66%
2160
16th to endDay
16%6%35%6%23445%41%
1977
October1st to 15thDay
18%8%47%435%346%34%
1800
16th to endDay
25%11%47%5%34445%24%
1916
November1st to 15thDay
35%11%47%5%34345%12%
1589
16th to endDay
28%10%5%9%6%4444416%
1560
December1st to 15thDay
26%10%5%9%7%3435%418%
1560
16th to endDay
37%12%48%5%44345%10%
1664
January1st to 15thNight
33%10%48%5%24335%17%
2716
16th to endNight
28%9%46%424346%23%
2766
February1st to 15thNight
29%9%37%5%34446%20%
2432
16th to endNight
27%10%37%5%2443426%
2008
March1st to 15thNight
30%11%36%5%2445%5%20%
2022
16th to endNight
28%9%48%6%3445%6%19%
2094
April1st to 15thNight
28%9%46%6%23345%24%
1799
16th to endNight
20%6%25%435%348%35%
1682
May1st to 15thNight
14%5%26%5%3435%6%41%
1493
16th to endNight
19%7%245%25%36%8%33%
1496
June1st to 15thNight
15%7%25%425%447%40%
1440
16th to endNight
10%5%24423345%51%
1440
July1st to 15thNight
421221223471%
1440
16th to endNight
311122380%
1533
August1st to 15thNight
221212235%72%
1620
16th to endNight
5%22212235%71%
1801
September1st to 15thNight
421222222472%
1800
16th to endNight
10%323324446%52%
1982
October1st to 15thNight
16%6%25%423445%45%
2160
16th to endNight
23%7%35%5%33445%35%
2307
November1st to 15thNight
32%7%36%5%35%5%46%20%
2600
16th to endNight
28%9%36%5%33435%26%
2730
December1st to 15thNight
28%9%46%5%23345%25%
2730
16th to endNight
34%10%49%5%3443414%
2912

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 15thDay
75%5%6%7%31
1552
16th to endDay
69%6%9%7%42
1807
February1st to 15thDay
73%6%8%7%3
1685
16th to endDay
72%6%6%7%6%
1466
March1st to 15thDay
74%6%8%7%3
1935
16th to endDay
71%7%11%7%2
2130
April1st to 15thDay
67%8%12%8%2
2149
16th to endDay
59%8%14%11%41
2277
May1st to 15thDay
49%5%13%20%9%1
2455
16th to endDay
54%8%15%16%4
2619
June1st to 15thDay
53%6%17%17%4
2520
16th to endDay
40%6%18%23%7%2
2520
July1st to 15thDay
20%5%12%29%24%7%
2371
16th to endDay
18%29%27%32%8%
2468
August1st to 15thDay
19%6%17%29%20%6%
2324
16th to endDay
21%6%12%30%24%4
2400
September1st to 15thDay
21%311%27%23%11%
2160
16th to endDay
44%6%14%19%12%3
1977
October1st to 15thDay
50%6%11%18%10%2
1800
16th to endDay
63%7%8%10%9%1
1916
November1st to 15thDay
73%6%10%6%1
1589
16th to endDay
71%5%8%5%8%
1560
December1st to 15thDay
68%6%8%9%7%
1560
16th to endDay
77%6%7%5%3
1664
January1st to 15thNight
70%5%9%7%5%1
2716
16th to endNight
62%5%10%10%8%2
2766
February1st to 15thNight
64%8%11%10%3
2444
16th to endNight
61%6%12%10%7%1
2008
March1st to 15thNight
65%7%10%11%4
2022
16th to endNight
65%7%13%10%3
2094
April1st to 15thNight
62%6%15%10%5%
1799
16th to endNight
49%7%18%16%41
1682
May1st to 15thNight
42%6%15%22%8%2
1494
16th to endNight
48%7%20%16%5%1
1496
June1st to 15thNight
43%7%19%21%6%
1440
16th to endNight
34%421%27%8%2
1440
July1st to 15thNight
16%414%29%26%8%
1360
16th to endNight
10%29%30%34%11%
1436
August1st to 15thNight
14%316%39%19%7%
1611
16th to endNight
17%310%37%23%7%
1801
September1st to 15thNight
17%411%28%24%13%
1800
16th to endNight
31%5%16%24%15%7%
1982
October1st to 15thNight
40%5%11%22%14%4
2160
16th to endNight
50%7%12%13%13%1
2307
November1st to 15thNight
63%8%10%12%4
2600
16th to endNight
61%6%10%9%10%1
2730
December1st to 15thNight
60%5%10%13%9%
2730
16th to endNight
74%6%8%7%2
2912

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 15thDay
38%6%13%23%14%3
90
16th to endDay
35%7%17%18%15%5%
239
February1st to 15thDay
34%8%19%20%15%2
273
16th to endDay
29%9%25%25%6%3
219
March1st to 15thDay
40%11%25%16%42
270
16th to endDay
32%13%26%18%6%1
288
April1st to 15thDay
27%11%23%21%10%5%
269
16th to endDay
23%14%28%18%10%4
270
May1st to 15thDay
21%11%29%20%13%2
288
16th to endDay
17%8%16%24%22%10%
330
June1st to 15thDay
19%7%21%28%19%2
315
16th to endDay
10%7%18%34%25%2
315
July1st to 15thDay
6%216%38%26%9%
305
16th to endDay
4217%42%25%7%
327
August1st to 15thDay
415%35%30%12%
315
16th to endDay
3316%30%36%9%
332
September1st to 15thDay
6%420%28%30%9%
315
16th to endDay
16%6%19%30%24%2
315
October1st to 15thDay
21%6%25%24%18%2
315
16th to endDay
28%423%21%15%5%
332
November1st to 15thDay
31%9%31%18%6%2
105
16th to endDay
40%6%26%11%10%5%
90
December1st to 15thDay
36%12%17%15%10%7%
90
16th to endDay
36%5%15%27%14%1
96
January1st to 15thNight
34%5%17%21%17%3
780
16th to endNight
30%316%27%18%3
832
February1st to 15thNight
29%416%28%19%1
752
16th to endNight
27%6%22%25%17%
632
March1st to 15thNight
31%7%19%25%14%
720
16th to endNight
29%5%21%28%13%1
768
April1st to 15thNight
28%5%19%26%19%
719
16th to endNight
20%219%35%20%1
602
May1st to 15thNight
14%323%38%19%1
414
16th to endNight
20%214%36%24%1
375
June1st to 15thNight
16%317%40%21%1
360
16th to endNight
11%118%49%19%
360
July1st to 15thNight
3115%49%28%1
340
16th to endNight
3111%53%29%1
397
August1st to 15thNight
46%39%42%6%
538
16th to endNight
5%11%40%40%1
655
September1st to 15thNight
5%10%40%37%5%
720
16th to endNight
11%211%38%33%2
716
October1st to 15thNight
16%218%35%24%2
720
16th to endNight
26%315%28%21%4
768
November1st to 15thNight
32%419%28%14%
760
16th to endNight
29%7%18%25%17%3
780
December1st to 15thNight
28%418%27%18%1
780
16th to endNight
35%5%20%23%14%1
832
Page generated at 2018-02-13 17:46:09. Version ac04

Copyright 2018 A. Danko


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