Kouchibouguac National Park
Clear Sky Chart
History

This sumarizes the distribution of each different forecast outcome for the Kouchibouguac National Park clear sky chart from 2005-11-06 to 2024-01-27.

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%
23324
15%
74968
6%
23264
36%
23264
17%
52069

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
15%
850
12%
2838
3%
847
25%
847
12%
2032
January11th to 20thNight
19%
839
14%
2827
4%
839
30%
839
14%
2013
January21st to endNight
25%
820
20%
2667
7%
820
41%
820
19%
1751
February1st to 10thNight
20%
720
15%
2340
5%
720
32%
720
17%
1618
February11th to 20thNight
15%
703
13%
2276
4%
700
25%
700
13%
1665
February21st to endNight
24%
592
18%
1909
6%
592
39%
592
18%
1310
March1st to 10thNight
21%
720
17%
2014
6%
720
32%
720
16%
1503
March11th to 20thNight
22%
720
17%
1980
6%
720
32%
720
19%
1435
March21st to endNight
22%
792
16%
2178
6%
792
31%
792
17%
1628
April1st to 10thNight
23%
570
12%
1830
6%
570
30%
570
14%
1361
April11th to 20thNight
25%
534
18%
1620
10%
534
33%
534
20%
1133
April21st to endNight
28%
540
15%
1620
7%
540
36%
540
18%
1167
May1st to 10thNight
32%
540
15%
1547
8%
540
38%
540
19%
1110
May11th to 20thNight
34%
532
15%
1417
6%
532
42%
532
23%
1009
May21st to endNight
31%
568
12%
1536
5%
567
36%
567
23%
1081
June1st to 10thNight
31%
360
9%
1260
7%
360
34%
360
15%
891
June11th to 20thNight
37%
360
13%
1260
9%
360
42%
360
19%
823
June21st to endNight
32%
360
7%
1260
5%
360
35%
360
15%
910
July1st to 10thNight
42%
350
12%
1225
6%
350
50%
350
22%
780
July11th to 20thNight
44%
348
12%
1218
10%
348
49%
348
23%
782
July21st to endNight
44%
552
11%
1488
9%
522
47%
522
22%
1038
August1st to 10thNight
46%
538
11%
1600
8%
534
49%
534
24%
1054
August11th to 20thNight
47%
532
14%
1596
10%
532
50%
532
23%
1065
August21st to endNight
45%
594
17%
1816
10%
594
51%
594
26%
1145
September1st to 10thNight
35%
540
17%
1800
8%
540
45%
540
26%
1098
September11th to 20thNight
38%
648
20%
1908
13%
648
47%
648
29%
1176
September21st to endNight
35%
720
22%
2007
12%
720
44%
720
29%
1276
October1st to 10thNight
33%
720
20%
2160
10%
720
41%
720
25%
1414
October11th to 20thNight
28%
720
21%
2160
7%
720
40%
720
23%
1434
October21st to endNight
18%
792
16%
2434
4%
792
31%
792
15%
1739
November1st to 10thNight
21%
825
16%
2583
6%
825
31%
825
17%
1796
November11th to 20thNight
20%
850
17%
2660
6%
850
31%
850
16%
1897
November21st to endNight
18%
850
13%
2660
3%
850
29%
850
13%
1922
December1st to 10thNight
12%
850
14%
2660
1%
850
25%
850
14%
1955
December11th to 20thNight
12%
850
13%
3432
3%
849
25%
849
9%
2550
December21st to endNight
14%
925
8%
5182
2%
907
26%
907
7%
3508

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
18%9%36%5%35%5%5%7%34%
74809
Night
19%10%36%5%3445%6%34%
75243
TransparencyDay
50%5%12%22%10%1
74505
Night
52%412%21%10%1
75083
SeeingDay
22%11%31%24%10%2
15553
Night
24%11%32%25%8%1
23334

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%16%47%5%24446%30%
1327
11th to 20thDay
19%14%38%7%5%5%326%29%
1350
21st to endDay
13%9%46%5%3345%7%42%
1831
February1st to 10thDay
15%10%48%6%35%5%6%6%33%
1620
11th to 20thDay
15%13%5%7%6%46%46%6%29%
1573
21st to endDay
11%10%5%7%7%36%5%5%7%34%
1345
March1st to 10thDay
17%14%46%5%36%45%6%30%
1941
11th to 20thDay
16%10%47%7%445%46%33%
1980
21st to endDay
19%12%5%7%5%34446%32%
2178
April1st to 10thDay
19%10%5%7%6%45%46%7%27%
2129
11th to 20thDay
21%9%345%35%45%7%35%
2288
21st to endDay
24%10%46%5%335%46%29%
2340
May1st to 10thDay
24%9%46%6%35%5%5%5%30%
2412
11th to 20thDay
22%8%35%5%34446%35%
2478
21st to endDay
19%8%36%435%5%6%7%34%
2753
June1st to 10thDay
26%9%35%6%345%5%7%27%
2700
11th to 20thDay
20%7%35%5%35%5%5%8%33%
2700
21st to endDay
25%8%36%6%345%46%28%
2700
July1st to 10thDay
16%7%26%5%45%6%7%9%33%
2700
11th to 20thDay
12%6%26%5%47%6%8%9%35%
2700
21st to endDay
15%6%37%6%46%6%6%9%32%
2719
August1st to 10thDay
16%6%26%6%35%6%6%8%35%
2327
11th to 20thDay
14%6%35%7%45%6%8%7%34%
2304
21st to endDay
13%6%25%5%35%5%5%9%42%
2539
September1st to 10thDay
16%5%24435%5%6%8%42%
2160
11th to 20thDay
17%7%26%5%34345%44%
2050
21st to endDay
18%6%245%44446%43%
1952
October1st to 10thDay
15%7%25%6%44446%41%
1800
11th to 20thDay
17%9%37%5%245%5%6%36%
1800
21st to endDay
23%7%25%5%345%6%6%33%
1922
November1st to 10thDay
19%9%36%6%45%5%5%7%32%
1495
11th to 20thDay
19%10%46%5%345%47%32%
1520
21st to endDay
17%13%5%7%4345%46%32%
1520
December1st to 10thDay
23%12%46%5%445%36%29%
1520
11th to 20thDay
18%13%6%9%5%34435%29%
1705
21st to endDay
18%11%48%5%3444435%
2431
January1st to 10thNight
17%12%49%7%35%5%5%6%29%
2838
11th to 20thNight
17%12%47%6%3445%6%32%
2827
21st to endNight
13%10%46%6%35%447%38%
2667
February1st to 10thNight
16%10%47%5%45%45%6%33%
2340
11th to 20thNight
17%14%48%6%4445%5%29%
2273
21st to endNight
14%13%47%6%35%45%6%34%
1909
March1st to 10thNight
17%13%5%8%6%35%345%31%
2005
11th to 20thNight
18%10%46%6%45%45%5%33%
1979
21st to endNight
19%13%5%8%5%2433433%
2178
April1st to 10thNight
25%11%46%6%345%5%427%
1830
11th to 20thNight
23%10%25%434447%34%
1620
21st to endNight
22%11%46%5%3445%5%31%
1620
May1st to 10thNight
27%9%35%42445%6%32%
1547
11th to 20thNight
23%7%36%42445%6%34%
1416
21st to endNight
15%8%37%6%45%5%5%7%35%
1535
June1st to 10thNight
26%9%46%5%3446%430%
1260
11th to 20thNight
20%8%34435%5%5%6%37%
1260
21st to endNight
26%7%28%5%3445%7%27%
1260
July1st to 10thNight
16%7%35%5%35%5%6%9%36%
1260
11th to 20thNight
13%6%35%6%46%6%7%9%35%
1260
21st to endNight
15%8%47%5%45%6%47%35%
1575
August1st to 10thNight
16%5%25%6%45%5%7%8%37%
1612
11th to 20thNight
15%7%36%5%45%5%6%8%36%
1596
21st to endNight
15%5%25%5%445%7%8%40%
1816
September1st to 10thNight
17%5%35%42335%9%44%
1800
11th to 20thNight
16%6%345%2345%6%47%
1908
21st to endNight
18%5%24424446%46%
2007
October1st to 10thNight
18%6%245%3445%6%41%
2160
11th to 20thNight
17%8%36%5%3335%6%40%
2160
21st to endNight
23%7%36%6%34446%34%
2434
November1st to 10thNight
22%7%35%435%45%7%35%
2583
11th to 20thNight
21%9%36%6%45%446%33%
2660
21st to endNight
22%10%46%5%3445%6%32%
2660
December1st to 10thNight
23%11%37%5%245%46%29%
2660
11th to 20thNight
21%15%47%5%34445%28%
3492
21st to endNight
21%12%5%7%5%34345%31%
5236

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
56%311%17%12%1
1328
11th to 20thDay
59%410%14%12%1
1350
21st to endDay
43%310%23%19%1
1831
February1st to 10thDay
51%312%20%13%2
1620
11th to 20thDay
55%49%20%10%2
1581
21st to endDay
49%410%21%13%3
1345
March1st to 10thDay
55%48%23%9%1
1945
11th to 20thDay
52%5%9%21%10%3
1980
21st to endDay
54%48%19%11%4
2178
April1st to 10thDay
55%48%17%12%3
2129
11th to 20thDay
49%410%23%13%2
2288
21st to endDay
55%49%16%12%3
2340
May1st to 10thDay
54%6%8%20%11%2
2412
11th to 20thDay
51%49%24%10%1
2482
21st to endDay
47%6%13%24%9%1
2753
June1st to 10thDay
56%5%12%20%8%
2700
11th to 20thDay
48%5%13%23%10%1
2700
21st to endDay
55%7%11%18%9%1
2700
July1st to 10thDay
45%6%18%23%8%
2625
11th to 20thDay
41%7%17%26%9%
2619
21st to endDay
46%7%17%22%8%
2567
August1st to 10thDay
44%7%15%26%8%
2314
11th to 20thDay
44%7%16%25%7%
2304
21st to endDay
39%5%16%29%12%
2539
September1st to 10thDay
39%6%17%26%12%
2160
11th to 20thDay
43%411%27%14%1
2050
21st to endDay
42%5%10%28%15%1
1952
October1st to 10thDay
44%312%28%12%1
1800
11th to 20thDay
49%413%24%10%
1800
21st to endDay
50%5%13%21%11%1
1922
November1st to 10thDay
52%5%10%22%10%1
1495
11th to 20thDay
53%313%18%11%1
1520
21st to endDay
55%5%15%18%7%
1520
December1st to 10thDay
59%5%14%16%7%
1520
11th to 20thDay
60%39%19%9%1
1705
21st to endDay
54%314%19%8%2
2431
January1st to 10thNight
56%412%19%8%1
2838
11th to 20thNight
55%412%18%10%1
2827
21st to endNight
47%310%25%12%2
2667
February1st to 10thNight
52%312%18%13%3
2340
11th to 20thNight
58%38%18%11%2
2276
21st to endNight
52%38%21%14%3
1909
March1st to 10thNight
57%37%20%11%2
2014
11th to 20thNight
53%38%19%14%2
1980
21st to endNight
57%37%19%11%4
2178
April1st to 10thNight
59%38%16%11%3
1830
11th to 20thNight
51%48%22%13%2
1620
21st to endNight
56%210%16%15%2
1620
May1st to 10thNight
53%49%20%13%2
1547
11th to 20thNight
50%410%22%12%1
1417
21st to endNight
48%5%15%22%10%1
1536
June1st to 10thNight
56%412%19%9%1
1260
11th to 20thNight
47%5%10%27%10%1
1260
21st to endNight
57%412%17%8%1
1260
July1st to 10thNight
44%5%18%25%7%
1225
11th to 20thNight
43%6%17%23%10%
1218
21st to endNight
49%5%18%20%8%
1488
August1st to 10thNight
43%7%16%27%8%
1600
11th to 20thNight
46%5%20%23%6%
1596
21st to endNight
41%5%17%26%11%
1816
September1st to 10thNight
39%5%13%30%13%1
1800
11th to 20thNight
39%313%29%16%1
1908
21st to endNight
39%411%30%15%1
2007
October1st to 10thNight
44%412%27%13%
2160
11th to 20thNight
47%312%29%8%
2160
21st to endNight
53%410%22%10%1
2434
November1st to 10thNight
52%312%22%10%1
2583
11th to 20thNight
54%312%20%10%1
2660
21st to endNight
55%5%14%19%7%
2660
December1st to 10thNight
58%313%18%7%
2660
11th to 20thNight
60%39%20%8%
3493
21st to endNight
58%213%19%8%
5236

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
29%14%31%24%3
180
11th to 20thDay
26%19%29%19%6%1
180
21st to endDay
17%13%38%24%7%1
387
February1st to 10thDay
23%13%39%21%31
340
11th to 20thDay
21%18%36%18%5%1
336
21st to endDay
16%14%41%21%7%
286
March1st to 10thDay
21%18%38%18%32
420
11th to 20thDay
21%15%34%22%7%1
420
21st to endDay
26%14%32%20%6%2
462
April1st to 10thDay
28%13%37%15%6%
420
11th to 20thDay
25%12%35%20%6%1
412
21st to endDay
29%11%30%20%9%2
420
May1st to 10thDay
29%9%32%20%9%1
495
11th to 20thDay
23%10%28%24%12%2
624
21st to endDay
23%12%31%25%8%1
680
June1st to 10thDay
31%9%28%21%9%2
630
11th to 20thDay
23%9%28%27%12%1
630
21st to endDay
26%6%26%28%12%2
630
July1st to 10thDay
18%5%32%28%16%2
620
11th to 20thDay
15%329%34%16%2
618
21st to endDay
16%426%34%17%4
642
August1st to 10thDay
15%325%35%19%4
446
11th to 20thDay
16%5%20%35%20%3
439
21st to endDay
15%7%24%35%15%4
495
September1st to 10thDay
17%432%31%13%3
450
11th to 20thDay
24%8%30%24%12%3
450
21st to endDay
19%10%31%26%11%3
435
October1st to 10thDay
18%9%31%25%14%3
360
11th to 20thDay
21%13%31%23%11%2
360
21st to endDay
28%13%36%17%6%1
396
November1st to 10thDay
22%15%35%21%7%1
365
11th to 20thDay
27%15%35%17%6%1
370
21st to endDay
25%18%37%17%21
370
December1st to 10thDay
28%13%35%18%6%
370
11th to 20thDay
28%22%36%12%2
217
21st to endDay
22%27%31%18%3
198
January1st to 10thNight
23%16%34%22%5%
850
11th to 20thNight
23%14%36%21%6%
839
21st to endNight
19%11%36%26%6%1
820
February1st to 10thNight
22%12%38%21%6%1
720
11th to 20thNight
25%13%36%20%42
703
21st to endNight
21%11%35%25%8%1
592
March1st to 10thNight
23%12%35%26%3
720
11th to 20thNight
24%12%34%22%7%1
720
21st to endNight
26%11%31%24%7%1
792
April1st to 10thNight
32%10%26%27%5%
570
11th to 20thNight
29%7%32%24%8%
534
21st to endNight
29%8%28%24%10%1
540
May1st to 10thNight
31%6%23%27%11%1
540
11th to 20thNight
26%6%26%27%14%1
532
21st to endNight
18%10%34%30%8%
568
June1st to 10thNight
31%5%23%31%9%
360
11th to 20thNight
24%426%36%10%1
360
21st to endNight
26%6%23%33%12%1
360
July1st to 10thNight
18%429%34%14%1
350
11th to 20thNight
14%331%38%13%1
348
21st to endNight
18%5%22%40%14%1
552
August1st to 10thNight
18%423%37%17%1
538
11th to 20thNight
17%420%37%20%1
532
21st to endNight
16%325%36%18%2
594
September1st to 10thNight
19%6%33%29%11%1
540
11th to 20thNight
19%7%29%30%13%1
648
21st to endNight
21%8%32%29%9%1
720
October1st to 10thNight
24%6%33%26%9%1
720
11th to 20thNight
22%11%33%24%9%1
720
21st to endNight
27%14%35%18%5%
792
November1st to 10thNight
26%14%33%21%6%1
825
11th to 20thNight
25%16%33%18%6%1
850
21st to endNight
28%16%31%20%3
850
December1st to 10thNight
29%13%39%14%31
850
11th to 20thNight
28%20%35%14%4
850
21st to endNight
29%16%32%18%31
935
Page generated at 2024-01-24 10:37:30. Version ac07

Copyright 2024 Attilla Danko


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