Campbellton
Clear Sky Chart
History

This sumarizes the distribution of each different forecast outcome for the Campbellton clear sky chart from 2005-11-06 to 2024-01-13.

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
17%
23806
9%
74950
3%
23737
24%
23737
11%
58138

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%
849
8%
2839
1%
847
17%
847
7%
2281
January11th to 20thNight
11%
814
8%
2578
2%
814
18%
814
7%
2089
January21st to endNight
9%
880
14%
2772
3%
880
21%
880
10%
2115
February1st to 10thNight
9%
800
9%
2520
1%
800
17%
800
9%
1953
February11th to 20thNight
8%
759
8%
2227
1%
756
15%
756
8%
1808
February21st to endNight
16%
592
14%
1776
2%
592
26%
592
12%
1336
March1st to 10thNight
13%
720
13%
2160
3%
720
21%
720
10%
1661
March11th to 20thNight
19%
593
11%
2033
5%
593
26%
593
9%
1569
March21st to endNight
14%
594
10%
2098
4%
594
23%
594
8%
1656
April1st to 10thNight
12%
540
12%
1800
5%
540
22%
540
9%
1387
April11th to 20thNight
16%
534
11%
1606
5%
534
24%
534
13%
1247
April21st to endNight
16%
540
11%
1620
4%
540
23%
540
11%
1278
May1st to 10thNight
22%
540
7%
1541
2%
540
25%
540
10%
1247
May11th to 20thNight
20%
532
9%
1328
2%
532
23%
532
15%
1050
May21st to endNight
19%
583
7%
1357
1%
582
22%
582
15%
1101
June1st to 10thNight
20%
540
4%
1260
1%
540
22%
540
12%
1052
June11th to 20thNight
25%
540
3%
1260
2%
540
26%
540
17%
983
June21st to endNight
25%
540
3%
1260
2%
540
27%
540
18%
993
July1st to 10thNight
26%
526
6%
1226
2%
526
30%
526
22%
908
July11th to 20thNight
31%
522
7%
1231
3%
522
34%
522
25%
908
July21st to endNight
29%
590
8%
1486
2%
558
33%
558
19%
1109
August1st to 10thNight
30%
538
8%
1422
2%
534
33%
534
19%
1051
August11th to 20thNight
33%
532
10%
1593
6%
532
36%
532
19%
1136
August21st to endNight
35%
594
13%
1782
9%
594
41%
594
21%
1229
September1st to 10thNight
27%
540
13%
1790
8%
540
36%
540
19%
1210
September11th to 20thNight
23%
540
13%
1980
8%
540
32%
540
14%
1376
September21st to endNight
22%
540
13%
1980
7%
540
30%
540
13%
1391
October1st to 10thNight
21%
562
15%
2024
7%
562
31%
562
13%
1425
October11th to 20thNight
22%
778
14%
2308
5%
778
29%
778
14%
1739
October21st to endNight
17%
891
10%
2574
3%
891
21%
891
10%
2073
November1st to 10thNight
13%
830
9%
2412
2%
830
19%
830
9%
1956
November11th to 20thNight
13%
850
11%
2693
3%
850
20%
850
9%
2113
November21st to endNight
11%
850
10%
2850
2%
850
19%
850
8%
2226
December1st to 10thNight
11%
850
8%
2850
2%
850
19%
850
7%
2346
December11th to 20thNight
6%
850
4%
3522
1%
849
11%
849
4%
3056
December21st to endNight
12%
933
4%
5192
2%
907
18%
907
4%
4080

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%13%5%8%6%35%45%6%23%
74589
Night
23%13%5%8%6%3445%6%22%
75150
TransparencyDay
64%310%16%7%1
74280
Night
64%310%16%7%1
74994
SeeingDay
31%13%29%19%7%2
16939
Night
31%13%30%21%5%1
23809

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
17%13%8%13%11%5%5%5%5%6%12%
1326
11th to 20thDay
17%15%6%11%10%47%5%5%6%15%
1439
21st to endDay
18%13%5%10%10%6%7%47%6%15%
1584
February1st to 10thDay
16%13%6%9%10%46%6%6%6%18%
1440
11th to 20thDay
19%17%6%10%9%35%5%5%6%16%
1618
21st to endDay
15%13%6%10%9%5%7%445%22%
1480
March1st to 10thDay
18%14%6%10%7%45%45%5%23%
1796
11th to 20thDay
17%16%6%10%8%46%445%20%
1926
21st to endDay
24%19%6%10%6%3434417%
2254
April1st to 10thDay
20%16%6%9%7%37%445%19%
2160
11th to 20thDay
23%16%6%7%5%23347%24%
2302
21st to endDay
22%17%6%8%6%35%445%22%
2340
May1st to 10thDay
26%17%5%7%5%34345%21%
2416
11th to 20thDay
25%14%47%5%345%45%24%
2565
21st to endDay
26%13%46%6%3445%6%23%
2918
June1st to 10thDay
32%12%47%6%35%45%418%
2700
11th to 20thDay
29%11%36%43445%5%24%
2700
21st to endDay
24%9%36%6%36%5%5%7%25%
2700
July1st to 10thDay
21%9%35%5%35%5%6%7%29%
2700
11th to 20thDay
18%8%36%5%46%5%5%7%32%
2683
21st to endDay
20%10%47%7%45%6%5%7%26%
2745
August1st to 10thDay
21%9%37%5%35%5%6%8%26%
2506
11th to 20thDay
20%8%37%7%35%6%6%7%28%
2305
21st to endDay
19%9%35%5%35%5%6%8%31%
2574
September1st to 10thDay
22%7%36%5%3445%7%34%
2165
11th to 20thDay
28%8%36%5%2445%6%28%
1980
21st to endDay
20%8%36%5%3445%8%33%
1980
October1st to 10thDay
23%10%45%5%34347%31%
1936
11th to 20thDay
24%12%48%7%35%5%6%6%22%
1651
21st to endDay
26%18%47%6%35%44419%
1782
November1st to 10thDay
24%16%5%9%5%445%5%6%18%
1666
11th to 20thDay
21%17%6%8%434447%22%
1482
21st to endDay
23%16%7%10%6%34446%19%
1330
December1st to 10thDay
21%17%6%10%7%35%5%46%16%
1330
11th to 20thDay
25%14%7%11%6%35%5%5%5%12%
1668
21st to endDay
22%18%5%13%8%4445%5%11%
2442
January1st to 10thNight
17%15%6%12%10%5%5%5%5%6%14%
2839
11th to 20thNight
16%14%6%13%9%46%5%6%6%15%
2578
21st to endNight
17%14%6%11%7%45%45%7%20%
2772
February1st to 10thNight
17%11%5%11%10%45%5%7%7%18%
2520
11th to 20thNight
20%16%6%9%7%45%5%45%18%
2223
21st to endNight
14%13%5%9%7%46%45%6%25%
1776
March1st to 10thNight
19%16%5%9%6%445%5%5%23%
2151
11th to 20thNight
16%16%6%9%8%46%6%5%5%20%
2032
21st to endNight
24%16%5%9%7%34445%21%
2098
April1st to 10thNight
24%17%5%7%5%34446%22%
1800
11th to 20thNight
25%15%5%6%5%24436%24%
1606
21st to endNight
26%16%5%7%423345%25%
1620
May1st to 10thNight
28%16%47%5%4435%5%19%
1541
11th to 20thNight
29%14%6%6%423345%24%
1327
21st to endNight
30%12%34435%45%6%23%
1356
June1st to 10thNight
34%11%46%5%245%5%7%17%
1260
11th to 20thNight
33%9%3442446%8%24%
1260
21st to endNight
25%10%37%6%45%447%25%
1260
July1st to 10thNight
24%8%35%4245%6%7%32%
1260
11th to 20thNight
18%7%37%6%335%6%8%34%
1273
21st to endNight
21%9%47%6%4446%7%29%
1573
August1st to 10thNight
21%8%47%6%346%6%7%28%
1433
11th to 20thNight
21%8%47%5%345%6%7%31%
1593
21st to endNight
22%7%36%5%35%45%6%34%
1782
September1st to 10thNight
24%8%35%43335%6%36%
1790
11th to 20thNight
25%9%35%6%345%45%32%
1980
21st to endNight
23%10%47%425%447%30%
1980
October1st to 10thNight
24%11%46%43445%6%29%
2024
11th to 20thNight
26%12%36%5%345%5%6%25%
2308
21st to endNight
31%17%36%5%23435%21%
2574
November1st to 10thNight
22%16%48%7%35%5%5%6%18%
2412
11th to 20thNight
24%15%6%8%5%25%45%6%19%
2693
21st to endNight
20%16%8%8%6%3445%7%19%
2850
December1st to 10thNight
21%16%7%11%6%45%5%5%5%14%
2850
11th to 20thNight
29%16%6%12%7%35%44410%
3531
21st to endNight
22%15%7%10%7%45%5%5%6%15%
5225

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
73%29%10%6%
1327
11th to 20thDay
70%310%11%6%
1439
21st to endDay
70%27%13%8%
1584
February1st to 10thDay
64%49%13%8%2
1440
11th to 20thDay
71%27%13%7%
1625
21st to endDay
66%27%13%11%1
1480
March1st to 10thDay
65%36%14%10%1
1800
11th to 20thDay
70%37%12%8%1
1926
21st to endDay
73%25%12%6%1
2254
April1st to 10thDay
69%37%12%8%1
2160
11th to 20thDay
65%28%15%10%1
2302
21st to endDay
68%27%14%9%
2340
May1st to 10thDay
69%28%15%6%
2416
11th to 20thDay
65%38%15%8%1
2569
21st to endDay
64%311%17%6%
2918
June1st to 10thDay
70%38%14%5%
2700
11th to 20thDay
62%410%18%5%1
2700
21st to endDay
60%312%15%8%1
2700
July1st to 10thDay
53%314%22%7%
2625
11th to 20thDay
52%415%22%7%
2601
21st to endDay
59%414%18%5%1
2592
August1st to 10thDay
57%414%21%4
2492
11th to 20thDay
56%415%18%7%
2305
21st to endDay
52%417%21%6%
2574
September1st to 10thDay
51%310%25%9%2
2165
11th to 20thDay
60%211%18%7%1
1980
21st to endDay
52%317%21%7%1
1980
October1st to 10thDay
57%39%22%9%1
1936
11th to 20thDay
65%410%17%5%
1651
21st to endDay
70%37%13%6%1
1782
November1st to 10thDay
69%311%11%5%1
1666
11th to 20thDay
65%310%13%8%1
1482
21st to endDay
68%310%10%8%1
1330
December1st to 10thDay
72%29%12%5%
1330
11th to 20thDay
73%310%10%4
1667
21st to endDay
76%29%11%2
2442
January1st to 10thNight
70%28%13%6%1
2839
11th to 20thNight
69%39%12%6%1
2578
21st to endNight
64%28%17%9%
2772
February1st to 10thNight
64%39%14%8%1
2520
11th to 20thNight
69%39%13%6%
2227
21st to endNight
60%38%17%11%1
1776
March1st to 10thNight
64%27%16%10%1
2160
11th to 20thNight
65%38%14%9%1
2033
21st to endNight
68%25%14%9%1
2098
April1st to 10thNight
65%26%15%11%1
1800
11th to 20thNight
65%27%17%8%1
1606
21st to endNight
65%38%14%9%1
1620
May1st to 10thNight
68%37%16%6%1
1541
11th to 20thNight
64%28%18%8%
1328
21st to endNight
64%311%13%7%1
1357
June1st to 10thNight
68%312%12%5%
1260
11th to 20thNight
60%313%18%6%
1260
21st to endNight
60%312%17%7%1
1260
July1st to 10thNight
52%416%22%6%
1226
11th to 20thNight
50%413%24%9%
1231
21st to endNight
56%415%21%5%
1486
August1st to 10thNight
55%416%22%4
1422
11th to 20thNight
53%416%20%7%
1593
21st to endNight
51%315%24%7%
1782
September1st to 10thNight
51%312%24%10%1
1790
11th to 20thNight
56%311%20%10%1
1980
21st to endNight
55%412%21%8%1
1980
October1st to 10thNight
57%313%18%9%1
2024
11th to 20thNight
60%311%20%6%
2308
21st to endNight
68%29%13%7%1
2574
November1st to 10thNight
67%410%13%6%
2412
11th to 20thNight
66%311%15%5%
2693
21st to endNight
67%310%12%8%
2850
December1st to 10thNight
71%38%12%5%
2850
11th to 20thNight
79%27%8%4
3533
21st to endNight
71%211%12%3
5225

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
27%17%33%16%5%1
370
11th to 20thDay
26%19%35%15%5%
349
21st to endDay
29%19%30%18%3
374
February1st to 10thDay
26%25%31%15%4
340
11th to 20thDay
29%20%36%11%31
336
21st to endDay
23%21%36%14%41
280
March1st to 10thDay
26%18%37%14%41
340
11th to 20thDay
29%15%28%18%9%1
340
21st to endDay
38%16%24%15%42
408
April1st to 10thDay
32%19%27%17%4
420
11th to 20thDay
36%10%30%18%42
580
21st to endDay
34%15%28%18%41
600
May1st to 10thDay
39%11%23%17%7%2
603
11th to 20thDay
31%11%27%21%8%2
624
21st to endDay
36%9%30%17%6%1
680
June1st to 10thDay
41%8%25%16%9%1
630
11th to 20thDay
39%7%25%18%9%2
630
21st to endDay
29%6%29%22%10%4
630
July1st to 10thDay
29%8%29%21%10%3
620
11th to 20thDay
26%7%26%29%11%1
618
21st to endDay
27%8%24%29%11%1
685
August1st to 10thDay
26%8%27%25%12%3
625
11th to 20thDay
25%6%26%23%16%3
617
21st to endDay
25%6%28%25%12%4
693
September1st to 10thDay
27%9%31%22%10%1
459
11th to 20thDay
37%10%28%19%6%1
360
21st to endDay
23%16%37%18%5%2
360
October1st to 10thDay
26%15%36%16%6%2
360
11th to 20thDay
32%11%27%18%8%4
360
21st to endDay
33%19%25%14%7%2
396
November1st to 10thDay
38%16%28%16%2
365
11th to 20thDay
34%19%25%16%5%2
370
21st to endDay
40%17%29%13%1
370
December1st to 10thDay
30%13%32%16%6%1
370
11th to 20thDay
32%23%27%14%4
370
21st to endDay
27%17%33%17%41
407
January1st to 10thNight
27%19%30%18%6%1
850
11th to 20thNight
27%20%32%17%3
814
21st to endNight
26%19%36%16%3
880
February1st to 10thNight
26%22%35%16%2
800
11th to 20thNight
33%18%35%11%3
759
21st to endNight
21%16%38%18%6%2
592
March1st to 10thNight
28%18%33%15%6%1
720
11th to 20thNight
26%17%28%23%6%1
593
21st to endNight
36%14%26%19%4
594
April1st to 10thNight
34%16%28%17%5%1
540
11th to 20thNight
32%10%32%19%6%1
534
21st to endNight
35%11%30%20%3
540
May1st to 10thNight
39%6%23%24%7%1
540
11th to 20thNight
36%8%27%21%8%
532
21st to endNight
37%10%29%19%5%
583
June1st to 10thNight
41%9%22%24%4
540
11th to 20thNight
39%6%23%26%7%
540
21st to endNight
29%6%30%23%11%1
540
July1st to 10thNight
26%7%31%28%7%1
526
11th to 20thNight
23%7%31%33%6%1
522
21st to endNight
25%5%31%31%7%
590
August1st to 10thNight
29%425%32%10%
538
11th to 20thNight
25%5%25%34%10%
532
21st to endNight
24%5%27%32%10%2
594
September1st to 10thNight
28%6%31%27%8%
540
11th to 20thNight
30%9%32%25%4
540
21st to endNight
31%10%31%23%4
540
October1st to 10thNight
31%9%32%23%5%
562
11th to 20thNight
34%10%26%21%7%1
778
21st to endNight
38%14%22%20%5%1
891
November1st to 10thNight
33%16%29%16%4
830
11th to 20thNight
34%14%29%16%6%1
850
21st to endNight
33%19%30%16%3
850
December1st to 10thNight
32%15%31%16%5%1
850
11th to 20thNight
36%18%31%12%3
850
21st to endNight
27%18%32%18%41
935
Page generated at 2024-01-10 21:35:26. Version ac07

Copyright 2024 Attilla Danko


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