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Boyne Falls
Clear Sky Chart
History

This sumarizes the distribution of each different forecast outcome for the Boyne Falls clear sky chart from 2005-11-05 to 2017-09-10.

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%
15681
11%
46783
7%
15639
33%
15639
15%
35505

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
12%
900
3%
2506
1%
895
14%
895
5%
2279
January16th to endNight
14%
960
5%
2688
2%
960
17%
960
6%
2361
February1st to 15thNight
14%
742
5%
2296
2%
742
17%
742
6%
1981
February16th to endNight
21%
631
8%
1893
4%
631
25%
631
8%
1578
March1st to 15thNight
25%
720
15%
2124
8%
720
30%
720
17%
1545
March16th to endNight
33%
744
18%
2088
11%
744
39%
744
20%
1464
April1st to 15thNight
27%
539
14%
1776
7%
539
35%
539
15%
1283
April16th to endNight
31%
540
18%
1620
8%
540
39%
540
22%
1096
May1st to 15thNight
31%
540
12%
1620
7%
540
37%
540
19%
1165
May16th to endNight
39%
553
14%
1504
7%
552
47%
552
27%
991
June1st to 15thNight
42%
360
13%
1260
10%
360
47%
360
21%
798
June16th to endNight
48%
360
12%
1260
9%
360
53%
360
24%
785
July1st to 15thNight
54%
505
14%
1355
9%
505
57%
505
35%
839
July16th to endNight
52%
564
14%
1417
11%
531
55%
531
35%
893
August1st to 15thNight
57%
539
17%
1566
13%
536
61%
536
35%
928
August16th to endNight
52%
573
16%
1761
12%
573
56%
573
29%
1084
September1st to 15thNight
47%
595
16%
1820
12%
595
52%
595
26%
1165
September16th to endNight
44%
657
15%
1815
10%
657
47%
657
26%
1226
October1st to 15thNight
32%
660
16%
1875
9%
660
39%
660
20%
1349
October16th to endNight
22%
704
8%
2284
4%
704
27%
704
9%
1830
November1st to 15thNight
21%
700
13%
2276
10%
700
27%
700
12%
1747
November16th to endNight
14%
735
6%
2453
3%
735
18%
735
6%
2087
December1st to 15thNight
9%
900
2%
2700
1%
900
10%
900
3%
2471
December16th to endNight
11%
960
3%
2826
1%
960
13%
960
4%
2560

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
16%10%47%6%3445%6%30%
47844
Night
15%12%5%8%6%34445%28%
46951
Cloud CoverDay
16%10%47%6%3445%6%30%
47853
Night
15%12%5%8%7%34445%28%
46956
TransparencyDay
53%5%11%18%9%
47530
Night
57%5%11%16%7%
46783
SeeingDay
20%12%29%23%10%3
5967
Night
21%13%29%25%9%1
15685

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 15thDay
15%17%9%15%10%5%5%4339%
1432
16th to endDay
12%18%10%16%11%5%5%32310%
1536
February1st to 15thDay
12%15%9%12%12%45%435%13%
1565
16th to endDay
13%16%8%11%7%45%5%45%17%
1580
March1st to 15thDay
12%10%5%8%9%3345%6%29%
1826
16th to endDay
15%10%5%6%5%2445%6%32%
2145
April1st to 15thDay
21%12%35%423346%31%
2171
16th to endDay
17%11%35%42345%6%34%
2340
May1st to 15thDay
18%7%45%5%2445%6%35%
2331
16th to endDay
13%6%25%425%45%6%42%
2607
June1st to 15thDay
14%6%25%435%5%5%8%37%
2700
16th to endDay
15%5%25%435%5%5%8%38%
2700
July1st to 15thDay
13%424425%5%5%8%44%
2521
16th to endDay
12%423425%46%10%42%
2655
August1st to 15thDay
10%5%25%5%36%5%6%8%40%
2384
16th to endDay
17%6%25%32435%6%42%
2439
September1st to 15thDay
17%7%245%23447%38%
2015
16th to endDay
16%6%345%2345%8%39%
1815
October1st to 15thDay
23%11%26%6%23335%30%
1754
16th to endDay
27%16%48%6%34445%15%
1587
November1st to 15thDay
18%16%6%8%5%23345%24%
1582
16th to endDay
18%23%9%12%7%3233312%
1504
December1st to 15thDay
17%19%12%17%8%143338%
1260
16th to endDay
18%24%12%15%6%222238%
1395
January1st to 15thNight
18%15%8%17%11%4432310%
2506
16th to endNight
12%16%8%14%12%6%433413%
2688
February1st to 15thNight
10%17%8%14%11%45%33315%
2294
16th to endNight
13%14%6%13%8%5%6%43418%
1893
March1st to 15thNight
12%10%48%7%3444434%
2111
16th to endNight
13%9%5%45%25%5%5%436%
2088
April1st to 15thNight
22%11%25%5%2345%5%30%
1776
16th to endNight
15%9%25%5%25%438%37%
1620
May1st to 15thNight
13%10%35%6%46%6%46%32%
1620
16th to endNight
12%7%245%34347%42%
1502
June1st to 15thNight
15%5%25%435%45%7%41%
1260
16th to endNight
12%6%24435%46%9%40%
1260
July1st to 15thNight
10%425%42445%6%48%
1435
16th to endNight
7%435%42446%7%49%
1513
August1st to 15thNight
8%42343445%10%48%
1575
16th to endNight
13%6%2442335%6%47%
1761
September1st to 15thNight
16%5%15%5%23346%44%
1820
16th to endNight
17%6%24424448%40%
1815
October1st to 15thNight
22%9%25%5%2245%7%33%
1875
16th to endNight
25%13%46%5%44445%20%
2284
November1st to 15thNight
17%16%5%7%5%2445%6%24%
2276
16th to endNight
19%22%7%10%5%24345%13%
2453
December1st to 15thNight
16%22%11%14%9%333238%
2700
16th to endNight
17%19%12%13%8%35%3239%
2826

Percentage Cloud Cover SE (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
15%17%10%15%10%5%5%2349%
1432
16th to endDay
12%17%11%16%11%5%5%4239%
1536
February1st to 15thDay
12%15%9%12%13%45%44412%
1565
16th to endDay
12%17%8%11%8%445%4417%
1580
March1st to 15thDay
12%10%5%8%9%4345%5%29%
1836
16th to endDay
15%11%5%6%5%2445%6%32%
2144
April1st to 15thDay
20%13%35%43335%6%30%
2171
16th to endDay
17%11%35%4245%5%6%33%
2340
May1st to 15thDay
19%8%35%4245%5%6%34%
2331
16th to endDay
13%7%24434447%42%
2607
June1st to 15thDay
14%6%35%435%5%6%7%36%
2700
16th to endDay
15%6%245%35%5%48%37%
2700
July1st to 15thDay
13%4245%3446%8%43%
2521
16th to endDay
12%5%245%2446%9%42%
2655
August1st to 15thDay
9%6%246%35%5%6%8%40%
2384
16th to endDay
17%6%25%424446%41%
2439
September1st to 15thDay
17%7%345%24447%38%
2015
16th to endDay
17%5%25%5%235%48%39%
1815
October1st to 15thDay
23%11%26%6%23235%30%
1754
16th to endDay
27%16%47%6%4345%5%14%
1587
November1st to 15thDay
18%16%6%6%6%2345%5%24%
1582
16th to endDay
18%22%9%11%7%3232313%
1504
December1st to 15thDay
17%18%12%17%8%233328%
1260
16th to endDay
18%24%11%15%6%232238%
1395
January1st to 15thNight
17%16%7%17%11%4433310%
2506
16th to endNight
11%16%8%13%12%6%5%43313%
2688
February1st to 15thNight
10%18%8%13%11%5%5%33315%
2287
16th to endNight
13%15%6%13%9%46%43418%
1893
March1st to 15thNight
13%10%47%7%3444433%
2124
16th to endNight
13%10%45%5%15%5%5%5%36%
2088
April1st to 15thNight
21%11%36%32445%5%30%
1776
16th to endNight
16%9%35%5%24446%37%
1620
May1st to 15thNight
13%9%35%7%46%5%5%6%32%
1619
16th to endNight
12%6%25%5%3435%7%42%
1502
June1st to 15thNight
14%5%25%4345%5%6%41%
1260
16th to endNight
12%5%244345%6%9%40%
1260
July1st to 15thNight
9%425%4245%5%7%48%
1435
16th to endNight
7%436%43345%7%49%
1513
August1st to 15thNight
8%42443446%9%49%
1575
16th to endNight
13%6%2442335%6%47%
1761
September1st to 15thNight
15%5%15%424436%45%
1820
16th to endNight
17%6%244145%48%40%
1815
October1st to 15thNight
22%8%35%5%2235%6%34%
1875
16th to endNight
25%12%47%5%34445%20%
2284
November1st to 15thNight
17%16%46%6%3445%6%24%
2276
16th to endNight
20%20%7%10%6%3334414%
2453
December1st to 15thNight
16%20%11%15%9%343238%
2700
16th to endNight
17%19%12%13%9%35%3349%
2826

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
80%6%5%6%
1433
16th to endDay
81%35%5%2
1536
February1st to 15thDay
73%6%8%8%2
1567
16th to endDay
68%6%9%11%4
1580
March1st to 15thDay
56%6%13%17%5%1
1836
16th to endDay
52%5%13%19%7%1
2145
April1st to 15thDay
54%311%19%10%
2171
16th to endDay
49%5%11%15%15%2
2340
May1st to 15thDay
48%6%10%21%10%3
2331
16th to endDay
41%6%12%25%13%1
2611
June1st to 15thDay
43%6%11%25%11%
2700
16th to endDay
43%6%13%22%12%
2700
July1st to 15thDay
36%6%11%28%15%1
2372
16th to endDay
37%7%13%24%15%
2488
August1st to 15thDay
38%8%14%25%12%
2369
16th to endDay
42%6%12%25%11%1
2439
September1st to 15thDay
44%6%11%25%11%
2015
16th to endDay
42%6%16%23%10%
1815
October1st to 15thDay
57%48%21%6%
1754
16th to endDay
70%6%11%9%2
1587
November1st to 15thDay
61%412%15%6%
1582
16th to endDay
77%49%7%1
1504
December1st to 15thDay
82%5%6%5%
1260
16th to endDay
83%45%41
1395
January1st to 15thNight
80%46%5%1
2506
16th to endNight
75%5%9%7%2
2688
February1st to 15thNight
74%5%7%10%2
2296
16th to endNight
70%5%9%10%4
1893
March1st to 15thNight
53%5%11%19%9%
2124
16th to endNight
47%5%11%21%11%1
2088
April1st to 15thNight
55%5%7%20%10%1
1776
16th to endNight
46%411%19%15%2
1620
May1st to 15thNight
50%6%11%18%9%3
1620
16th to endNight
41%413%24%14%1
1504
June1st to 15thNight
41%6%12%22%15%
1260
16th to endNight
38%7%14%24%13%
1260
July1st to 15thNight
32%6%13%27%17%1
1355
16th to endNight
33%6%17%24%16%1
1417
August1st to 15thNight
31%6%18%30%12%
1566
16th to endNight
37%5%16%25%13%1
1761
September1st to 15thNight
40%6%13%25%13%1
1820
16th to endNight
42%7%17%24%8%
1815
October1st to 15thNight
50%5%10%23%8%
1875
16th to endNight
65%6%11%13%3
2284
November1st to 15thNight
59%6%11%14%6%
2276
16th to endNight
73%5%10%7%2
2453
December1st to 15thNight
83%46%4
2700
16th to endNight
80%47%41
2826

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
21%20%43%14%1
90
16th to endDay
32%9%33%19%5%
96
February1st to 15thDay
21%28%36%11%2
90
16th to endDay
23%23%38%13%1
81
March1st to 15thDay
22%26%26%18%6%
126
16th to endDay
25%10%28%22%11%1
288
April1st to 15thDay
27%12%29%20%8%1
270
16th to endDay
20%13%35%15%11%2
270
May1st to 15thDay
23%16%27%19%9%3
288
16th to endDay
17%16%30%24%7%2
501
June1st to 15thDay
17%14%32%24%8%2
495
16th to endDay
17%11%31%28%7%3
495
July1st to 15thDay
15%9%28%28%13%4
475
16th to endDay
12%8%29%33%10%5%
515
August1st to 15thDay
11%226%30%20%8%
357
16th to endDay
24%5%21%25%18%6%
332
September1st to 15thDay
19%5%25%21%20%8%
294
16th to endDay
16%9%22%30%16%4
254
October1st to 15thDay
28%9%31%21%8%1
255
16th to endDay
31%22%34%10%11
99
November1st to 15thDay
21%15%31%21%10%1
90
16th to endDay
27%24%26%17%4
73
December1st to 15thDay
38%26%26%5%11
60
16th to endDay
34%41%21%11
73
January1st to 15thNight
24%20%29%20%4
900
16th to endNight
19%19%35%20%5%
960
February1st to 15thNight
20%19%36%19%4
745
16th to endNight
22%15%29%26%5%
631
March1st to 15thNight
18%17%32%22%7%
720
16th to endNight
19%13%28%29%8%1
744
April1st to 15thNight
27%10%30%24%5%
539
16th to endNight
21%10%34%25%8%
540
May1st to 15thNight
17%11%35%27%7%
540
16th to endNight
15%9%28%34%11%
554
June1st to 15thNight
17%7%28%33%12%
360
16th to endNight
12%6%28%38%13%1
360
July1st to 15thNight
12%5%23%39%17%1
505
16th to endNight
9%326%37%20%1
564
August1st to 15thNight
10%123%37%24%1
539
16th to endNight
16%420%36%19%1
573
September1st to 15thNight
19%424%29%18%3
595
16th to endNight
19%7%24%29%15%3
657
October1st to 15thNight
26%7%28%25%10%1
660
16th to endNight
34%12%26%21%4
704
November1st to 15thNight
26%15%32%18%6%
700
16th to endNight
30%17%32%17%2
735
December1st to 15thNight
25%22%35%14%2
900
16th to endNight
25%20%32%18%31
960
Page generated at 2017-09-11 19:35:26. Version ac04

Copyright 2017 A. Danko


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