Boyne Falls
Clear Sky Chart
History

This sumarizes the distribution of each different forecast outcome for the Boyne Falls clear sky chart from 2005-11-06 to 2024-02-20.

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
28%
24367
10%
80977
7%
24265
32%
24265
13%
62638

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
10%
945
3%
4412
2%
926
12%
926
3%
3882
January11th to 20thNight
13%
947
2%
4436
2%
930
15%
930
3%
4006
January21st to endNight
13%
1038
2%
4884
2%
1023
15%
1023
3%
4440
February1st to 10thNight
14%
824
6%
2534
4%
824
17%
824
6%
2198
February11th to 20thNight
17%
739
8%
2250
3%
738
22%
738
9%
1860
February21st to endNight
16%
592
9%
1776
2%
592
23%
592
8%
1452
March1st to 10thNight
27%
720
15%
2160
9%
720
32%
720
18%
1532
March11th to 20thNight
22%
720
17%
2015
7%
720
30%
720
18%
1467
March21st to endNight
31%
756
17%
2142
10%
756
37%
756
19%
1537
April1st to 10thNight
24%
540
12%
1800
6%
540
31%
540
13%
1331
April11th to 20thNight
29%
533
18%
1657
10%
533
37%
533
19%
1170
April21st to endNight
30%
540
15%
1620
7%
540
37%
540
20%
1130
May1st to 10thNight
33%
540
14%
1620
9%
540
39%
540
19%
1155
May11th to 20thNight
33%
531
14%
1530
10%
531
38%
531
20%
1082
May21st to endNight
45%
572
14%
1541
8%
571
51%
571
29%
1001
June1st to 10thNight
41%
360
14%
1260
11%
360
48%
360
23%
769
June11th to 20thNight
49%
360
15%
1260
13%
360
53%
360
25%
764
June21st to endNight
46%
360
15%
1260
11%
360
53%
360
25%
768
July1st to 10thNight
59%
517
16%
1392
11%
517
62%
517
41%
821
July11th to 20thNight
55%
522
17%
1392
12%
522
58%
522
34%
867
July21st to endNight
52%
591
15%
1487
12%
558
55%
558
34%
943
August1st to 10thNight
57%
537
17%
1534
13%
534
60%
534
33%
934
August11th to 20thNight
59%
534
18%
1598
13%
534
63%
534
33%
958
August21st to endNight
49%
594
16%
1844
12%
594
52%
594
26%
1162
September1st to 10thNight
50%
562
17%
1822
14%
562
54%
562
28%
1109
September11th to 20thNight
47%
720
20%
1980
15%
720
51%
720
30%
1282
September21st to endNight
42%
720
16%
1980
11%
720
45%
720
23%
1393
October1st to 10thNight
35%
720
16%
1988
10%
720
41%
720
22%
1401
October11th to 20thNight
21%
720
10%
2243
4%
720
27%
720
12%
1740
October21st to endNight
20%
792
10%
2574
6%
792
27%
792
10%
2060
November1st to 10thNight
21%
740
13%
2406
9%
740
28%
740
12%
1842
November11th to 20thNight
14%
760
9%
2470
5%
760
20%
760
7%
2035
November21st to endNight
12%
783
5%
2648
2%
783
16%
783
6%
2272
December1st to 10thNight
11%
950
2%
2850
1%
950
12%
950
4%
2573
December11th to 20thNight
11%
950
3%
3521
1%
949
13%
949
4%
3116
December21st to endNight
8%
1038
2%
5091
0%
1026
11%
1026
2%
4586

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
15%12%5%9%6%3445%6%30%
78027
Night
15%14%6%10%8%44445%26%
81183
TransparencyDay
55%6%11%18%9%1
77733
Night
60%6%10%15%7%1
81012
SeeingDay
20%16%30%22%9%3
14572
Night
21%14%30%26%9%1
24393

By Month

Percentage Cloud Cover NE (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
11%22%13%25%8%432327%
2527
11th to 20thDay
12%18%8%16%19%7%5%4226%
2530
21st to endDay
16%23%12%13%8%45%3448%
2783
February1st to 10thDay
8%18%9%13%15%5%5%435%13%
1644
11th to 20thDay
13%15%8%13%11%445%35%19%
1800
21st to endDay
13%17%8%13%8%345%5%5%19%
1480
March1st to 10thDay
13%11%6%10%8%445%46%28%
1798
11th to 20thDay
11%12%6%8%7%3445%5%35%
1944
21st to endDay
18%12%5%6%6%3445%7%29%
2227
April1st to 10thDay
20%14%5%8%5%3445%6%26%
2160
11th to 20thDay
21%14%45%42435%6%33%
2251
21st to endDay
16%12%47%5%346%6%7%30%
2340
May1st to 10thDay
17%9%46%4245%5%6%37%
2340
11th to 20thDay
16%8%36%5%35%446%40%
2361
21st to endDay
12%6%35%6%25%5%6%7%43%
2733
June1st to 10thDay
14%5%25%435%5%6%8%42%
2700
11th to 20thDay
14%6%25%5%45%5%6%8%40%
2700
21st to endDay
15%6%25%5%35%5%5%8%41%
2700
July1st to 10thDay
10%4244245%6%10%49%
2521
11th to 20thDay
13%5%245%35%5%5%9%44%
2520
21st to endDay
12%5%245%25%5%6%10%44%
2743
August1st to 10thDay
11%5%35%5%36%6%7%8%40%
2394
11th to 20thDay
12%5%26%5%35%5%6%7%44%
2303
21st to endDay
16%6%35%43436%7%44%
2509
September1st to 10thDay
16%7%25%5%345%6%7%42%
2119
11th to 20thDay
15%5%345%445%5%7%44%
1980
21st to endDay
17%8%35%5%345%6%10%35%
1980
October1st to 10thDay
20%11%37%5%23446%33%
1971
11th to 20thDay
27%17%48%6%34445%17%
1715
21st to endDay
24%19%5%9%6%44445%16%
1782
November1st to 10thDay
18%19%6%8%42445%6%24%
1672
11th to 20thDay
14%22%9%12%7%5%4445%15%
1710
21st to endDay
18%23%10%13%6%3333413%
1526
December1st to 10thDay
15%22%14%17%7%243349%
1330
11th to 20thDay
14%20%10%18%10%35%43410%
1671
21st to endDay
20%22%10%17%8%333348%
2563
January1st to 10thNight
13%21%10%21%9%3322311%
4428
11th to 20thNight
12%16%8%17%17%8%5%3338%
4440
21st to endNight
15%20%11%15%12%5%43338%
4884
February1st to 10thNight
9%17%8%15%15%5%6%43314%
2534
11th to 20thNight
11%14%7%16%11%45%445%19%
2250
21st to endNight
15%18%6%11%7%45%445%20%
1776
March1st to 10thNight
12%11%5%8%6%45%5%45%36%
2149
11th to 20thNight
11%12%6%8%7%35%5%4434%
2015
21st to endNight
15%11%46%6%35%5%6%5%34%
2142
April1st to 10thNight
20%12%47%6%345%6%5%27%
1800
11th to 20thNight
20%10%46%6%3445%7%33%
1657
21st to endNight
16%11%47%5%34448%34%
1620
May1st to 10thNight
14%9%45%7%46%5%5%6%33%
1620
11th to 20thNight
14%11%37%6%45%5%5%5%35%
1530
21st to endNight
12%6%246%35%36%8%44%
1540
June1st to 10thNight
15%5%245%35%45%7%43%
1260
11th to 20thNight
11%5%26%5%345%7%11%41%
1260
21st to endNight
13%6%24435%35%7%46%
1260
July1st to 10thNight
10%5%243245%7%9%51%
1432
11th to 20thNight
9%436%6%35%45%6%49%
1440
21st to endNight
8%5%36%6%3446%8%48%
1575
August1st to 10thNight
9%5%24445%46%9%48%
1543
11th to 20thNight
12%42443446%8%49%
1598
21st to endNight
15%7%25%5%3445%6%45%
1844
September1st to 10thNight
14%5%25%5%2445%6%49%
1822
11th to 20thNight
16%6%25%5%2345%7%45%
1980
21st to endNight
19%8%345%345%5%8%37%
1980
October1st to 10thNight
20%9%26%5%3345%6%37%
1988
11th to 20thNight
24%15%37%6%4445%5%23%
2243
21st to endNight
27%15%5%6%5%34445%21%
2574
November1st to 10thNight
17%18%5%8%5%34347%26%
2406
11th to 20thNight
15%21%8%11%7%35%445%17%
2470
21st to endNight
18%22%10%12%6%34345%14%
2648
December1st to 10thNight
13%23%13%17%8%4433310%
2850
11th to 20thNight
14%20%9%17%11%3433411%
3526
21st to endNight
20%22%9%14%7%344449%
5099

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
87%3441
2528
11th to 20thDay
87%4441
2530
21st to endDay
82%48%42
2783
February1st to 10thDay
74%6%8%9%3
1644
11th to 20thDay
69%6%9%10%7%
1810
21st to endDay
67%6%8%14%4
1480
March1st to 10thDay
58%6%11%16%8%1
1800
11th to 20thDay
53%5%12%21%7%3
1944
21st to endDay
54%6%12%17%10%1
2227
April1st to 10thDay
60%5%10%17%9%1
2160
11th to 20thDay
53%5%10%18%13%1
2251
21st to endDay
53%6%10%14%13%3
2340
May1st to 10thDay
46%6%11%22%12%3
2340
11th to 20thDay
46%5%9%22%15%3
2365
21st to endDay
39%7%13%25%15%1
2733
June1st to 10thDay
39%7%11%27%14%2
2700
11th to 20thDay
41%7%12%22%17%1
2700
21st to endDay
41%6%13%24%14%1
2700
July1st to 10thDay
31%7%13%29%18%2
2452
11th to 20thDay
36%7%11%29%16%1
2445
21st to endDay
36%8%12%27%16%1
2591
August1st to 10thDay
39%9%15%26%11%1
2379
11th to 20thDay
37%8%14%27%12%1
2303
21st to endDay
41%6%13%26%13%2
2509
September1st to 10thDay
42%6%11%24%16%1
2119
11th to 20thDay
39%7%15%28%10%1
1980
21st to endDay
46%6%15%24%9%
1980
October1st to 10thDay
53%5%10%24%8%1
1971
11th to 20thDay
69%49%13%3
1715
21st to endDay
69%8%10%10%3
1782
November1st to 10thDay
61%6%10%17%6%
1672
11th to 20thDay
72%5%10%8%4
1710
21st to endDay
77%411%7%1
1526
December1st to 10thDay
81%47%6%1
1330
11th to 20thDay
80%6%8%5%1
1671
21st to endDay
84%46%32
2563
January1st to 10thNight
79%5%6%8%1
4428
11th to 20thNight
82%5%7%5%2
4440
21st to endNight
81%6%7%42
4884
February1st to 10thNight
75%5%6%9%31
2534
11th to 20thNight
67%6%10%13%4
2251
21st to endNight
68%5%9%13%5%
1776
March1st to 10thNight
51%5%13%20%10%1
2160
11th to 20thNight
52%6%11%18%11%2
2016
21st to endNight
50%6%10%20%12%1
2142
April1st to 10thNight
57%6%8%18%10%1
1800
11th to 20thNight
52%49%21%12%2
1657
21st to endNight
50%5%10%19%14%3
1620
May1st to 10thNight
50%7%10%18%11%4
1620
11th to 20thNight
50%6%9%19%14%2
1531
21st to endNight
38%6%13%24%15%3
1541
June1st to 10thNight
40%6%13%25%16%1
1260
11th to 20thNight
38%7%14%26%14%3
1260
21st to endNight
38%7%13%26%15%2
1260
July1st to 10thNight
28%6%16%29%18%3
1392
11th to 20thNight
35%6%14%26%19%1
1392
21st to endNight
33%8%17%25%16%1
1487
August1st to 10thNight
33%7%18%29%12%1
1534
11th to 20thNight
32%7%16%29%14%1
1598
21st to endNight
40%6%16%22%14%1
1844
September1st to 10thNight
36%7%14%24%18%2
1822
11th to 20thNight
39%6%16%29%10%1
1980
21st to endNight
45%8%16%22%7%
1980
October1st to 10thNight
47%6%12%23%11%1
1988
11th to 20thNight
62%5%12%16%5%
2243
21st to endNight
65%6%10%14%5%
2574
November1st to 10thNight
59%7%11%16%6%1
2406
11th to 20thNight
70%5%10%10%5%
2470
21st to endNight
74%6%11%8%1
2648
December1st to 10thNight
82%47%7%1
2850
11th to 20thNight
78%6%9%5%2
3525
21st to endNight
80%7%8%31
5099

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
20%20%40%14%5%
270
11th to 20thDay
24%22%34%15%3
270
21st to endDay
24%18%37%16%4
297
February1st to 10thDay
17%34%34%9%41
270
11th to 20thDay
21%31%34%11%2
267
21st to endDay
26%30%38%6%1
198
March1st to 10thDay
22%27%36%13%2
240
11th to 20thDay
22%18%36%17%6%1
384
21st to endDay
28%15%28%22%7%1
462
April1st to 10thDay
27%16%32%18%6%1
420
11th to 20thDay
31%19%26%14%8%2
412
21st to endDay
19%19%32%19%10%1
420
May1st to 10thDay
25%22%26%16%9%3
423
11th to 20thDay
19%16%33%21%7%4
507
21st to endDay
15%13%32%27%10%3
679
June1st to 10thDay
14%16%33%25%9%2
630
11th to 20thDay
17%14%30%27%9%3
630
21st to endDay
17%9%33%30%9%2
630
July1st to 10thDay
11%9%30%31%15%4
621
11th to 20thDay
14%10%27%31%13%5%
618
21st to endDay
11%8%32%32%13%4
684
August1st to 10thDay
12%8%27%27%21%6%
513
11th to 20thDay
12%6%21%34%16%10%
439
21st to endDay
21%7%25%26%16%4
495
September1st to 10thDay
20%10%26%23%16%6%
450
11th to 20thDay
13%11%24%28%18%6%
450
21st to endDay
20%12%23%28%13%4
450
October1st to 10thDay
26%16%28%18%11%2
450
11th to 20thDay
33%19%29%15%31
365
21st to endDay
34%21%30%9%41
297
November1st to 10thDay
28%20%30%16%6%
270
11th to 20thDay
23%27%35%12%3
270
21st to endDay
26%30%30%11%3
195
December1st to 10thDay
29%20%34%11%32
180
11th to 20thDay
24%27%37%9%21
180
21st to endDay
31%33%28%6%21
236
January1st to 10thNight
21%20%33%19%6%
950
11th to 20thNight
21%22%31%20%5%
950
21st to endNight
20%16%35%24%5%
1045
February1st to 10thNight
18%20%35%22%4
824
11th to 20thNight
20%24%29%22%5%
742
21st to endNight
25%18%33%21%3
592
March1st to 10thNight
17%14%36%25%7%1
720
11th to 20thNight
19%21%34%21%6%
720
21st to endNight
21%13%29%29%7%1
756
April1st to 10thNight
27%12%32%23%5%1
540
11th to 20thNight
25%10%33%24%8%
533
21st to endNight
20%11%33%28%7%1
540
May1st to 10thNight
17%11%33%31%8%1
540
11th to 20thNight
19%11%32%29%9%1
531
21st to endNight
15%9%26%35%14%1
573
June1st to 10thNight
17%7%31%34%10%1
360
11th to 20thNight
11%8%27%40%15%
360
21st to endNight
14%6%29%37%13%1
360
July1st to 10thNight
12%322%46%15%1
517
11th to 20thNight
11%5%23%36%23%2
522
21st to endNight
9%426%39%20%2
591
August1st to 10thNight
11%223%40%23%1
537
11th to 20thNight
14%417%35%27%3
534
21st to endNight
17%6%22%37%16%2
594
September1st to 10thNight
16%425%33%19%3
562
11th to 20thNight
19%6%23%32%18%3
720
21st to endNight
21%10%22%29%14%3
720
October1st to 10thNight
23%11%25%28%12%1
720
11th to 20thNight
32%13%29%20%5%1
720
21st to endNight
35%14%27%18%5%1
792
November1st to 10thNight
27%15%32%20%5%
740
11th to 20thNight
25%21%33%18%4
760
21st to endNight
30%17%34%17%2
783
December1st to 10thNight
23%22%34%18%3
950
11th to 20thNight
23%22%35%16%31
950
21st to endNight
28%19%33%17%2
1045
Page generated at 2024-02-17 06:28:42. Version ac07

Copyright 2024 Attilla Danko


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