Campbellton
Clear Sky Chart
History

This sumarizes the distribution of each different forecast outcome for the Campbellton clear sky chart from 2005-11-05 to 2019-06-02.

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
18%
17405
10%
53819
3%
17362
24%
17362
11%
41575

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
10%
898
8%
3079
2%
896
17%
896
7%
2474
January16th to endNight
9%
960
12%
3136
1%
960
20%
960
9%
2405
February1st to 15thNight
10%
884
10%
2818
1%
881
19%
881
10%
2151
February16th to endNight
12%
743
11%
2232
1%
743
21%
743
10%
1740
March1st to 15thNight
15%
811
12%
2491
3%
811
23%
811
10%
1923
March16th to endNight
16%
672
9%
2402
4%
672
24%
672
8%
1883
April1st to 15thNight
15%
629
14%
2032
6%
629
25%
629
11%
1545
April16th to endNight
16%
623
10%
1868
5%
623
22%
623
12%
1464
May1st to 15thNight
23%
630
8%
1755
3%
630
26%
630
12%
1402
May16th to endNight
20%
657
6%
1533
2%
656
22%
656
14%
1251
June1st to 15thNight
23%
589
3%
1374
1%
589
24%
589
13%
1126
June16th to endNight
24%
585
3%
1365
2%
585
25%
585
16%
1078
July1st to 15thNight
30%
555
6%
1295
2%
555
33%
555
24%
939
July16th to endNight
29%
613
7%
1493
2%
580
33%
580
18%
1128
August1st to 15thNight
31%
574
9%
1585
3%
570
34%
570
19%
1161
August16th to endNight
36%
621
11%
1863
8%
621
41%
621
21%
1295
September1st to 15thNight
27%
585
13%
2009
8%
585
35%
585
18%
1345
September16th to endNight
24%
583
13%
2145
7%
583
32%
583
14%
1477
October1st to 15thNight
21%
657
15%
2284
6%
657
31%
657
13%
1625
October16th to endNight
17%
896
9%
2704
3%
896
22%
896
10%
2164
November1st to 15thNight
16%
880
10%
2741
3%
880
22%
880
9%
2190
November16th to endNight
10%
900
10%
3105
2%
900
19%
900
8%
2438
December1st to 15thNight
11%
900
7%
3150
1%
900
18%
900
7%
2575
December16th to endNight
10%
960
6%
3360
2%
960
15%
960
6%
2796

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
22%12%47%6%34445%22%
54521
Night
22%12%47%6%34446%21%
53980
TransparencyDay
63%310%15%6%
54200
Night
63%310%16%6%
53819
SeeingDay
31%13%28%18%7%1
10439
Night
30%13%29%20%5%
17407

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%13%7%11%10%45%5%5%5%13%
1516
16th to endDay
17%13%5%8%10%5%7%46%6%13%
1792
February1st to 15thDay
16%13%5%7%8%36%5%6%6%19%
1701
16th to endDay
17%15%7%11%8%35%44418%
1810
March1st to 15thDay
18%13%5%8%7%35%44423%
2118
16th to endDay
23%17%6%9%7%3433316%
2523
April1st to 15thDay
19%14%6%8%6%35%446%21%
2575
16th to endDay
24%15%47%5%24335%23%
2697
May1st to 15thDay
25%16%36%5%33345%23%
2851
16th to endDay
29%12%36%5%33345%22%
3285
June1st to 15thDay
31%11%46%5%25%45%419%
2940
16th to endDay
28%8%36%5%25%45%5%24%
2925
July1st to 15thDay
17%7%25%5%35%5%6%7%33%
2925
16th to endDay
20%8%36%6%35%5%46%27%
2929
August1st to 15thDay
21%8%37%5%35%5%5%6%26%
2617
16th to endDay
20%8%26%5%25%5%5%7%29%
2691
September1st to 15thDay
24%8%35%424347%32%
2277
16th to endDay
23%7%35%5%33447%31%
2145
October1st to 15thDay
25%9%35%5%24346%27%
2005
16th to endDay
29%15%36%5%2444417%
1872
November1st to 15thDay
21%16%5%7%4345%46%19%
1777
16th to endDay
22%16%5%8%5%33445%19%
1512
December1st to 15thDay
19%16%5%11%7%45%445%17%
1470
16th to endDay
19%18%6%9%9%3446%6%10%
1568
January1st to 15thNight
17%15%6%11%9%45%5%5%6%14%
3079
16th to endNight
16%12%5%12%7%45%45%7%17%
3136
February1st to 15thNight
18%10%410%8%45%5%5%6%20%
2818
16th to endNight
18%16%5%8%6%34445%22%
2232
March1st to 15thNight
17%15%5%8%6%45%5%45%21%
2478
16th to endNight
24%14%47%7%34435%19%
2402
April1st to 15thNight
23%16%46%433446%23%
2032
16th to endNight
26%14%46%423335%24%
1868
May1st to 15thNight
27%15%5%7%42334421%
1755
16th to endNight
31%12%34434346%21%
1531
June1st to 15thNight
34%10%35%41446%7%17%
1374
16th to endNight
29%10%35%5%24335%26%
1365
July1st to 15thNight
18%5%35%5%2446%7%35%
1365
16th to endNight
23%7%36%5%3345%7%29%
1588
August1st to 15thNight
21%8%46%6%335%5%6%28%
1596
16th to endNight
22%6%35%42445%6%33%
1863
September1st to 15thNight
23%8%3443235%5%35%
2009
16th to endNight
22%8%36%41445%7%30%
2145
October1st to 15thNight
26%10%35%423446%28%
2284
16th to endNight
32%15%35%42333420%
2704
November1st to 15thNight
24%15%47%5%3445%6%18%
2741
16th to endNight
22%15%7%7%5%24447%17%
3105
December1st to 15thNight
20%16%5%10%6%35%5%5%5%14%
3150
16th to endNight
21%15%8%9%8%45%5%45%11%
3360

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
70%28%11%5%
1517
16th to endDay
69%37%12%6%
1792
February1st to 15thDay
62%310%14%8%
1705
16th to endDay
70%2412%8%
1810
March1st to 15thDay
64%37%14%9%
2128
16th to endDay
73%25%11%5%
2523
April1st to 15thDay
66%38%12%9%1
2575
16th to endDay
65%17%15%8%
2697
May1st to 15thDay
65%38%17%5%
2851
16th to endDay
64%210%15%5%
3289
June1st to 15thDay
68%49%14%3
2940
16th to endDay
62%38%16%8%
2925
July1st to 15thDay
47%415%23%8%
2767
16th to endDay
57%412%19%5%
2761
August1st to 15thDay
57%414%18%5%
2603
16th to endDay
53%416%18%6%
2691
September1st to 15thDay
54%311%22%7%
2277
16th to endDay
53%315%21%6%
2145
October1st to 15thDay
59%39%18%7%
2005
16th to endDay
70%35%14%6%
1872
November1st to 15thDay
66%310%12%5%
1777
16th to endDay
66%310%11%7%
1512
December1st to 15thDay
68%39%13%4
1470
16th to endDay
73%27%12%3
1568
January1st to 15thNight
68%38%13%6%
3079
16th to endNight
64%29%16%7%
3136
February1st to 15thNight
62%310%15%7%
2818
16th to endNight
63%37%15%8%1
2232
March1st to 15thNight
63%28%15%8%
2491
16th to endNight
67%36%13%8%1
2402
April1st to 15thNight
62%27%16%10%1
2032
16th to endNight
64%27%15%8%
1868
May1st to 15thNight
65%27%17%5%
1755
16th to endNight
65%311%12%6%
1533
June1st to 15thNight
65%412%12%5%
1374
16th to endNight
61%39%17%7%
1365
July1st to 15thNight
47%415%23%7%
1295
16th to endNight
55%412%21%5%
1493
August1st to 15thNight
54%315%20%5%
1585
16th to endNight
49%416%22%6%
1863
September1st to 15thNight
50%313%24%8%
2009
16th to endNight
53%313%20%7%
2145
October1st to 15thNight
56%213%17%8%1
2284
16th to endNight
67%28%14%7%
2704
November1st to 15thNight
65%410%13%5%
2741
16th to endNight
67%29%13%6%
3105
December1st to 15thNight
70%39%12%4
3150
16th to endNight
73%28%11%4
3360

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
25%21%36%12%3
330
16th to endDay
28%19%33%15%3
352
February1st to 15thDay
24%23%31%14%4
326
16th to endDay
23%23%33%12%41
290
March1st to 15thDay
27%18%30%15%6%1
330
16th to endDay
33%17%26%15%5%1
369
April1st to 15thDay
31%18%29%17%2
452
16th to endDay
35%13%26%16%5%1
587
May1st to 15thDay
35%11%20%21%8%2
618
16th to endDay
38%7%26%18%7%
679
June1st to 15thDay
40%7%20%18%11%2
575
16th to endDay
35%7%31%15%7%3
570
July1st to 15thDay
24%10%29%21%11%3
550
16th to endDay
28%5%25%26%12%1
594
August1st to 15thDay
25%8%28%23%12%2
550
16th to endDay
26%5%23%25%14%4
603
September1st to 15thDay
30%9%32%18%7%1
362
16th to endDay
27%12%35%19%4
314
October1st to 15thDay
27%15%34%14%5%2
315
16th to endDay
36%17%24%10%8%2
336
November1st to 15thDay
32%16%28%16%5%1
325
16th to endDay
39%15%28%14%2
330
December1st to 15thDay
27%16%32%17%5%
330
16th to endDay
28%19%31%14%41
352
January1st to 15thNight
27%19%31%16%3
900
16th to endNight
25%22%34%15%3
960
February1st to 15thNight
27%19%34%15%2
884
16th to endNight
27%15%34%15%5%1
743
March1st to 15thNight
27%18%30%16%6%
811
16th to endNight
32%14%26%20%4
672
April1st to 15thNight
33%14%29%16%4
629
16th to endNight
33%12%29%19%5%
623
May1st to 15thNight
35%6%22%25%9%1
630
16th to endNight
38%9%26%20%5%
657
June1st to 15thNight
40%7%21%24%5%
589
16th to endNight
33%7%25%23%9%
585
July1st to 15thNight
20%9%31%30%6%
555
16th to endNight
26%6%29%30%7%
613
August1st to 15thNight
29%423%31%10%
574
16th to endNight
24%425%33%10%1
621
September1st to 15thNight
27%5%31%26%7%
585
16th to endNight
28%9%32%26%3
583
October1st to 15thNight
33%8%29%21%4
657
16th to endNight
41%13%21%17%5%
896
November1st to 15thNight
31%15%27%17%6%
880
16th to endNight
34%17%29%14%4
900
December1st to 15thNight
30%17%33%14%4
900
16th to endNight
31%18%29%16%31
960
Page generated at 2019-06-02 20:43:06. Version ac04

Copyright 2019 A. Danko


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