Bucksport
Clear Sky Chart
History

This sumarizes the distribution of each different forecast outcome for the Bucksport clear sky chart from 2005-11-05 to 2017-12-04.

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
26%
15149
16%
47800
7%
15114
37%
15114
18%
32346

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
18%
720
18%
2506
5%
716
34%
716
14%
1611
January16th to endNight
12%
768
16%
2670
2%
768
30%
768
12%
1774
February1st to 15thNight
17%
704
14%
2278
4%
701
29%
701
13%
1599
February16th to endNight
18%
631
18%
1893
4%
631
34%
631
16%
1308
March1st to 15thNight
16%
720
17%
2094
4%
720
30%
720
16%
1493
March16th to endNight
23%
768
19%
2112
6%
768
34%
768
20%
1448
April1st to 15thNight
16%
673
17%
1762
4%
673
25%
673
16%
1301
April16th to endNight
25%
540
13%
1620
5%
540
32%
540
18%
1139
May1st to 15thNight
24%
540
13%
1620
6%
540
31%
540
17%
1172
May16th to endNight
24%
456
11%
1524
7%
455
31%
455
13%
1111
June1st to 15thNight
30%
360
9%
1260
7%
360
36%
360
13%
918
June16th to endNight
42%
360
9%
1260
9%
360
46%
360
18%
873
July1st to 15thNight
43%
340
10%
1307
11%
340
48%
340
19%
857
July16th to endNight
45%
388
12%
1429
12%
365
50%
365
16%
960
August1st to 15thNight
43%
539
11%
1608
7%
535
47%
535
22%
1090
August16th to endNight
42%
576
20%
1722
12%
576
46%
576
28%
1070
September1st to 15thNight
38%
720
17%
1920
8%
720
44%
720
31%
1234
September16th to endNight
41%
717
27%
1980
14%
717
51%
717
31%
1189
October1st to 15thNight
33%
720
20%
2073
8%
720
44%
720
24%
1363
October16th to endNight
22%
768
17%
2444
7%
768
34%
768
18%
1636
November1st to 15thNight
28%
760
19%
2472
10%
760
40%
760
18%
1650
November16th to endNight
23%
815
19%
2685
6%
815
39%
815
16%
1762
December1st to 15thNight
17%
769
15%
2699
4%
769
31%
769
14%
1855
December16th to endNight
13%
797
16%
2862
3%
797
30%
797
12%
1933

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
19%7%35%434446%36%
48691
Night
18%7%35%424446%37%
47973
TransparencyDay
47%5%11%21%12%1
48382
Night
47%411%22%12%1
47800
SeeingDay
26%14%29%19%8%2
6664
Night
24%13%29%23%7%
15149

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%9%36%324447%37%
1432
16th to endDay
16%9%36%32335%6%37%
1554
February1st to 15thDay
15%11%36%5%34446%34%
1581
16th to endDay
14%10%37%5%35%5%5%5%32%
1580
March1st to 15thDay
21%8%45%5%23335%34%
1856
16th to endDay
17%8%35%434336%38%
2112
April1st to 15thDay
20%8%27%5%23346%35%
2185
16th to endDay
20%7%35%433346%36%
2340
May1st to 15thDay
25%7%35%43445%7%30%
2332
16th to endDay
22%6%36%5%23447%32%
2600
June1st to 15thDay
26%6%46%6%34446%26%
2700
16th to endDay
21%6%35%6%4445%7%30%
2700
July1st to 15thDay
14%5%25%435%46%9%37%
2569
16th to endDay
15%6%35%5%345%6%8%33%
2630
August1st to 15thDay
15%6%25%435%5%6%9%35%
2340
16th to endDay
13%4245%3445%7%45%
2477
September1st to 15thDay
13%6%23423346%48%
2040
16th to endDay
15%323323446%50%
1980
October1st to 15thDay
19%5%15%5%23336%42%
1887
16th to endDay
21%6%24433335%39%
1779
November1st to 15thDay
20%6%1443435%6%38%
1716
16th to endDay
21%7%24413436%39%
1602
December1st to 15thDay
23%9%24224335%36%
1340
16th to endDay
23%11%45%324335%33%
1359
January1st to 15thNight
16%8%25%42345%6%38%
2506
16th to endNight
14%10%36%6%34446%35%
2670
February1st to 15thNight
14%8%46%7%45%5%46%32%
2277
16th to endNight
15%9%45%5%3434437%
1893
March1st to 15thNight
19%11%45%424445%33%
2081
16th to endNight
16%7%26%5%34446%38%
2112
April1st to 15thNight
20%9%47%423445%32%
1762
16th to endNight
23%7%26%424346%34%
1620
May1st to 15thNight
24%7%35%43435%6%30%
1620
16th to endNight
21%8%45%5%345%46%28%
1522
June1st to 15thNight
26%8%45%42336%7%26%
1260
16th to endNight
19%6%26%4246%47%34%
1260
July1st to 15thNight
16%5%36%5%3445%8%34%
1387
16th to endNight
16%7%26%435%5%48%33%
1526
August1st to 15thNight
14%5%25%6%35%6%5%7%36%
1620
16th to endNight
12%5%2442445%8%44%
1722
September1st to 15thNight
15%5%2432335%6%47%
1920
16th to endNight
13%413424347%50%
1980
October1st to 15thNight
18%6%25%424436%41%
2073
16th to endNight
21%8%25%5%33336%38%
2444
November1st to 15thNight
20%7%25%5%33445%39%
2472
16th to endNight
19%6%2442445%5%39%
2685
December1st to 15thNight
22%8%34424245%35%
2699
16th to endNight
23%10%34323336%34%
2862

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
46%312%22%12%2
1433
16th to endDay
45%412%23%11%1
1554
February1st to 15thDay
50%412%20%11%
1584
16th to endDay
50%5%10%19%11%2
1580
March1st to 15thDay
52%211%17%12%2
1866
16th to endDay
46%49%17%17%4
2112
April1st to 15thDay
49%38%19%16%2
2185
16th to endDay
50%39%18%13%4
2340
May1st to 15thDay
53%48%18%12%2
2332
16th to endDay
50%6%12%19%9%1
2604
June1st to 15thDay
58%5%11%16%8%1
2700
16th to endDay
51%7%10%18%11%
2700
July1st to 15thDay
40%7%15%25%11%
2420
16th to endDay
45%7%15%21%9%1
2465
August1st to 15thDay
42%7%16%25%8%
2327
16th to endDay
37%5%13%25%17%
2477
September1st to 15thDay
36%5%12%26%17%1
2040
16th to endDay
33%5%9%28%21%1
1980
October1st to 15thDay
43%410%25%15%1
1887
16th to endDay
47%212%25%11%
1779
November1st to 15thDay
47%5%12%20%13%
1716
16th to endDay
46%5%14%19%13%
1602
December1st to 15thDay
50%413%21%9%
1340
16th to endDay
54%39%19%12%
1359
January1st to 15thNight
45%413%23%11%1
2506
16th to endNight
49%410%22%12%1
2670
February1st to 15thNight
51%411%19%11%
2278
16th to endNight
49%49%19%14%2
1893
March1st to 15thNight
52%38%19%13%2
2094
16th to endNight
46%310%18%17%3
2112
April1st to 15thNight
53%47%16%16%2
1762
16th to endNight
50%410%17%13%4
1620
May1st to 15thNight
53%5%9%16%14%1
1620
16th to endNight
57%49%19%7%1
1524
June1st to 15thNight
56%5%12%17%6%1
1260
16th to endNight
49%6%11%21%10%
1260
July1st to 15thNight
45%7%13%21%11%
1307
16th to endNight
48%6%12%23%6%1
1429
August1st to 15thNight
44%7%15%22%9%
1608
16th to endNight
37%6%14%26%14%
1722
September1st to 15thNight
37%5%12%28%14%1
1920
16th to endNight
33%48%32%18%1
1980
October1st to 15thNight
44%310%26%14%1
2073
16th to endNight
47%311%24%11%
2444
November1st to 15thNight
47%411%22%13%1
2472
16th to endNight
45%5%11%20%15%1
2685
December1st to 15thNight
51%410%23%10%
2699
16th to endNight
52%211%20%12%
2862

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
35%8%35%20%1
60
16th to endDay
30%18%36%12%2
82
February1st to 15thDay
25%24%29%15%5%
237
16th to endDay
20%23%32%17%5%
239
March1st to 15thDay
32%19%29%14%3
270
16th to endDay
29%20%26%14%6%2
288
April1st to 15thDay
33%18%27%12%5%2
270
16th to endDay
30%22%28%11%5%2
270
May1st to 15thDay
33%15%30%14%41
288
16th to endDay
29%13%30%20%4
385
June1st to 15thDay
31%11%26%21%9%
495
16th to endDay
27%9%28%23%9%1
495
July1st to 15thDay
20%10%33%20%12%1
354
16th to endDay
19%8%35%23%10%2
326
August1st to 15thDay
20%9%30%24%11%2
313
16th to endDay
19%8%25%29%12%4
332
September1st to 15thDay
20%9%33%24%8%5%
315
16th to endDay
19%11%29%18%13%8%
314
October1st to 15thDay
23%11%26%19%13%5%
292
16th to endDay
34%13%29%17%41
288
November1st to 15thDay
26%15%26%21%8%2
280
16th to endDay
26%19%28%17%7%1
285
December1st to 15thDay
30%17%28%18%5%
122
16th to endDay
48%15%28%7%
64
January1st to 15thNight
26%20%31%18%3
720
16th to endNight
25%20%34%16%3
768
February1st to 15thNight
22%20%34%20%2
704
16th to endNight
23%19%33%18%4
631
March1st to 15thNight
29%16%31%17%3
720
16th to endNight
22%19%30%20%7%
768
April1st to 15thNight
28%16%32%17%4
673
16th to endNight
27%12%30%22%5%
540
May1st to 15thNight
28%8%33%22%6%
540
16th to endNight
27%10%30%23%6%
456
June1st to 15thNight
30%9%23%28%6%
360
16th to endNight
23%5%23%38%9%
360
July1st to 15thNight
22%422%36%13%
340
16th to endNight
21%422%38%13%
388
August1st to 15thNight
19%423%39%12%
539
16th to endNight
16%6%27%32%15%1
576
September1st to 15thNight
20%6%31%26%14%1
720
16th to endNight
16%10%27%27%16%3
717
October1st to 15thNight
24%9%26%25%12%1
720
16th to endNight
26%15%31%19%6%
768
November1st to 15thNight
25%13%27%24%8%1
760
16th to endNight
25%17%28%19%7%
815
December1st to 15thNight
30%15%32%17%3
769
16th to endNight
31%20%28%16%2
797
Page generated at 2017-12-05 10:19:04. Version ac04

Copyright 2017 A. Danko


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