This page made possible by the sponsorship of: Ian Corbett.

Bangs Falls
Clear Sky Chart
History

This sumarizes the distribution of each different forecast outcome for the Bangs Falls 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
22%
15767
14%
48519
5%
15725
31%
15725
16%
34446

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
15%
817
10%
2683
3%
813
24%
813
11%
1970
January16th to endNight
14%
832
11%
2704
3%
832
24%
832
11%
2013
February1st to 15thNight
13%
750
9%
2443
2%
750
23%
750
10%
1881
February16th to endNight
15%
631
10%
2018
3%
631
24%
631
12%
1471
March1st to 15thNight
18%
720
15%
1983
5%
720
27%
720
14%
1475
March16th to endNight
17%
768
15%
2112
3%
768
28%
768
16%
1530
April1st to 15thNight
16%
569
15%
1817
4%
569
27%
569
13%
1303
April16th to endNight
20%
540
15%
1620
6%
540
29%
540
17%
1145
May1st to 15thNight
20%
540
12%
1572
5%
540
27%
540
15%
1180
May16th to endNight
21%
561
11%
1496
3%
560
27%
560
18%
1095
June1st to 15thNight
18%
519
8%
1419
2%
519
23%
519
15%
1105
June16th to endNight
24%
360
9%
1260
2%
360
32%
360
14%
894
July1st to 15thNight
31%
395
12%
1245
7%
395
38%
395
24%
812
July16th to endNight
33%
565
11%
1520
8%
532
37%
532
21%
1080
August1st to 15thNight
38%
539
15%
1608
10%
535
42%
535
25%
1058
August16th to endNight
35%
573
20%
1767
11%
573
43%
573
27%
1101
September1st to 15thNight
29%
561
20%
1821
11%
561
39%
561
24%
1129
September16th to endNight
34%
717
24%
1995
14%
717
43%
717
27%
1298
October1st to 15thNight
28%
720
19%
2160
7%
720
39%
720
23%
1410
October16th to endNight
22%
768
18%
2304
6%
768
33%
768
19%
1545
November1st to 15thNight
28%
792
14%
2600
8%
792
35%
792
17%
1799
November16th to endNight
23%
825
13%
2730
5%
825
33%
825
14%
1942
December1st to 15thNight
14%
825
11%
2730
2%
825
25%
825
12%
2010
December16th to endNight
12%
880
12%
2912
2%
880
24%
880
8%
2200

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
21%9%36%5%34446%29%
49517
Night
21%8%36%5%3445%6%30%
48696
TransparencyDay
54%310%19%10%1
49212
Night
52%311%21%9%
48519
SeeingDay
29%14%30%17%6%1
7880
Night
26%13%31%20%6%
15770

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
17%12%5%8%7%5%5%6%47%18%
1581
16th to endDay
19%10%5%7%6%46%5%6%5%22%
1872
February1st to 15thDay
19%12%6%9%8%345%46%18%
1683
16th to endDay
13%14%5%12%6%34446%24%
1452
March1st to 15thDay
22%12%47%6%44235%27%
1966
16th to endDay
17%12%5%7%5%24335%31%
2112
April1st to 15thDay
24%11%46%5%24345%28%
2132
16th to endDay
25%7%34323345%35%
2340
May1st to 15thDay
27%8%36%5%23345%27%
2380
16th to endDay
25%9%35%31435%7%30%
2618
June1st to 15thDay
30%9%36%423335%26%
2550
16th to endDay
22%8%35%5%345%47%29%
2700
July1st to 15thDay
19%7%35%43445%8%33%
2625
16th to endDay
21%9%36%5%34447%28%
2541
August1st to 15thDay
20%5%25%5%245%5%8%32%
2340
16th to endDay
15%6%24434348%41%
2435
September1st to 15thDay
18%6%24323446%41%
2136
16th to endDay
18%7%24323346%43%
1964
October1st to 15thDay
21%7%25%423338%38%
1800
16th to endDay
22%8%36%5%34445%31%
1920
November1st to 15thDay
21%11%46%433247%28%
1586
16th to endDay
22%9%47%6%35%445%25%
1560
December1st to 15thDay
27%10%37%6%2445%5%19%
1560
16th to endDay
25%11%47%6%44446%19%
1664
January1st to 15thNight
18%10%37%8%36%5%6%8%21%
2683
16th to endNight
18%10%48%8%36%5%6%6%20%
2704
February1st to 15thNight
19%12%47%7%46%5%5%6%18%
2442
16th to endNight
15%12%48%7%37%5%5%5%24%
2018
March1st to 15thNight
21%9%35%5%45%44430%
1971
16th to endNight
18%10%36%5%33446%32%
2112
April1st to 15thNight
26%9%25%5%24445%30%
1817
16th to endNight
25%7%35%423345%33%
1620
May1st to 15thNight
25%9%46%5%23446%27%
1572
16th to endNight
23%7%36%5%2335%6%32%
1494
June1st to 15thNight
30%7%45%42435%6%25%
1419
16th to endNight
23%8%26%5%33446%31%
1260
July1st to 15thNight
16%6%25%425%45%8%36%
1320
16th to endNight
19%6%36%5%245%5%8%31%
1625
August1st to 15thNight
17%6%35%5%2345%6%40%
1620
16th to endNight
15%5%25%433346%45%
1767
September1st to 15thNight
16%6%25%32335%7%42%
1821
16th to endNight
19%5%23423336%44%
1995
October1st to 15thNight
20%5%24424446%39%
2160
16th to endNight
22%6%334245%45%36%
2304
November1st to 15thNight
21%7%35%6%335%5%7%30%
2600
16th to endNight
21%9%36%5%3445%6%29%
2730
December1st to 15thNight
23%10%47%5%3445%8%22%
2730
16th to endNight
24%9%5%7%6%45%45%5%21%
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
62%413%14%5%
1582
16th to endDay
58%410%18%7%
1872
February1st to 15thDay
64%213%14%4
1686
16th to endDay
59%312%17%6%1
1452
March1st to 15thDay
60%38%17%9%1
1977
16th to endDay
55%28%19%12%1
2112
April1st to 15thDay
57%36%16%14%1
2132
16th to endDay
52%310%19%12%2
2340
May1st to 15thDay
58%38%17%10%1
2380
16th to endDay
53%312%20%8%1
2622
June1st to 15thDay
60%38%17%8%1
2550
16th to endDay
53%5%11%17%11%
2700
July1st to 15thDay
45%5%14%20%11%1
2472
16th to endDay
53%5%12%21%6%
2383
August1st to 15thDay
47%5%12%20%12%1
2327
16th to endDay
41%312%28%13%
2435
September1st to 15thDay
42%411%23%16%2
2136
16th to endDay
42%36%28%16%1
1964
October1st to 15thDay
46%29%25%14%1
1800
16th to endDay
52%211%22%9%
1920
November1st to 15thDay
56%312%17%8%1
1586
16th to endDay
57%412%17%7%
1560
December1st to 15thDay
63%310%18%4
1560
16th to endDay
63%39%15%7%
1664
January1st to 15thNight
57%415%16%5%
2683
16th to endNight
59%412%19%4
2704
February1st to 15thNight
61%410%16%6%
2443
16th to endNight
56%315%16%6%
2018
March1st to 15thNight
56%310%18%9%1
1983
16th to endNight
53%210%19%12%1
2112
April1st to 15thNight
56%28%17%13%2
1817
16th to endNight
53%29%21%11%2
1620
May1st to 15thNight
59%29%19%8%
1572
16th to endNight
52%412%20%8%
1496
June1st to 15thNight
60%410%18%6%
1419
16th to endNight
55%411%17%10%
1260
July1st to 15thNight
42%6%14%24%11%
1245
16th to endNight
50%414%22%6%1
1520
August1st to 15thNight
43%413%26%11%
1608
16th to endNight
40%412%27%14%
1767
September1st to 15thNight
41%39%29%13%2
1821
16th to endNight
42%26%30%17%1
1995
October1st to 15thNight
45%211%25%13%1
2160
16th to endNight
47%312%24%11%
2304
November1st to 15thNight
50%413%21%9%
2600
16th to endNight
53%414%18%8%
2730
December1st to 15thNight
57%413%20%4
2730
16th to endNight
60%410%17%7%
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
26%19%34%16%2
285
16th to endDay
27%22%33%13%2
304
February1st to 15thDay
29%20%29%19%1
272
16th to endDay
22%19%34%17%41
218
March1st to 15thDay
33%23%27%10%5%
270
16th to endDay
32%19%27%11%7%1
288
April1st to 15thDay
32%22%28%11%3
270
16th to endDay
29%15%37%11%5%
270
May1st to 15thDay
34%18%27%14%41
336
16th to endDay
34%12%31%14%41
519
June1st to 15thDay
35%13%30%17%3
495
16th to endDay
28%12%29%21%5%1
495
July1st to 15thDay
24%6%34%21%10%1
475
16th to endDay
28%6%29%24%9%
402
August1st to 15thDay
22%11%32%21%10%1
313
16th to endDay
18%7%32%25%12%2
332
September1st to 15thDay
22%11%36%20%7%1
315
16th to endDay
23%10%31%18%10%5%
309
October1st to 15thDay
26%11%31%17%8%4
270
16th to endDay
29%17%28%13%9%1
288
November1st to 15thDay
25%14%27%21%9%2
280
16th to endDay
31%17%29%13%7%1
285
December1st to 15thDay
41%16%24%13%4
285
16th to endDay
37%20%27%12%1
304
January1st to 15thNight
26%19%33%17%2
817
16th to endNight
29%18%30%18%3
832
February1st to 15thNight
29%16%33%18%2
753
16th to endNight
24%17%35%16%5%
631
March1st to 15thNight
29%17%29%20%3
720
16th to endNight
27%17%32%16%5%
768
April1st to 15thNight
33%15%30%16%3
569
16th to endNight
29%14%31%19%4
540
May1st to 15thNight
32%10%30%20%5%
540
16th to endNight
26%11%35%21%6%
561
June1st to 15thNight
32%9%32%19%5%
519
16th to endNight
27%6%34%21%9%
360
July1st to 15thNight
18%441%24%10%
395
16th to endNight
20%6%32%30%9%
565
August1st to 15thNight
19%6%28%30%13%
539
16th to endNight
17%5%35%27%11%
573
September1st to 15thNight
20%9%35%24%8%
561
16th to endNight
22%8%29%22%13%2
717
October1st to 15thNight
24%11%32%22%8%1
720
16th to endNight
26%14%32%19%7%
768
November1st to 15thNight
25%13%27%24%8%1
792
16th to endNight
27%17%25%21%7%
825
December1st to 15thNight
33%15%30%17%4
825
16th to endNight
34%19%28%14%3
880
Page generated at 2018-02-13 21:46:07. Version ac04

Copyright 2018 A. Danko


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