Moncton
Clear Sky Chart
History

This sumarizes the distribution of each different forecast outcome for the Moncton clear sky chart from 2005-11-06 to 2024-03-28.

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
20%
23656
14%
81004
5%
23525
30%
23525
13%
56922

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%
841
17%
4652
1%
817
21%
817
6%
2820
January11th to 20thNight
14%
822
13%
4488
3%
799
26%
799
6%
3004
January21st to endNight
16%
833
11%
4490
4%
814
32%
814
8%
3018
February1st to 10thNight
13%
760
12%
2470
3%
760
25%
760
11%
1789
February11th to 20thNight
12%
743
12%
2406
2%
740
25%
740
10%
1782
February21st to endNight
18%
628
15%
2022
4%
628
32%
628
14%
1423
March1st to 10thNight
14%
760
15%
2112
4%
760
24%
760
13%
1613
March11th to 20thNight
18%
760
13%
2090
4%
760
25%
760
13%
1565
March21st to endNight
16%
821
15%
2256
4%
821
27%
821
15%
1705
April1st to 10thNight
15%
570
11%
1830
4%
570
23%
570
10%
1406
April11th to 20thNight
18%
534
16%
1641
6%
534
27%
534
16%
1158
April21st to endNight
20%
540
13%
1620
4%
540
28%
540
14%
1202
May1st to 10thNight
23%
540
13%
1565
6%
540
29%
540
15%
1167
May11th to 20thNight
22%
532
14%
1417
4%
532
32%
532
18%
1029
May21st to endNight
18%
583
11%
1551
3%
582
25%
582
19%
1131
June1st to 10thNight
26%
414
9%
1314
6%
414
30%
414
15%
961
June11th to 20thNight
26%
360
11%
1260
6%
360
34%
360
16%
870
June21st to endNight
28%
360
7%
1260
4%
360
31%
360
13%
923
July1st to 10thNight
28%
350
12%
1225
5%
350
39%
350
20%
798
July11th to 20thNight
33%
366
11%
1236
8%
366
38%
366
20%
828
July21st to endNight
29%
590
10%
1549
7%
558
33%
558
19%
1144
August1st to 10thNight
36%
538
10%
1600
6%
534
40%
534
22%
1086
August11th to 20thNight
32%
532
13%
1596
7%
532
37%
532
19%
1128
August21st to endNight
38%
594
16%
1831
9%
594
43%
594
25%
1162
September1st to 10thNight
30%
540
16%
1800
7%
540
41%
540
24%
1114
September11th to 20thNight
35%
644
19%
1904
12%
644
44%
644
26%
1222
September21st to endNight
30%
720
22%
2011
10%
720
40%
720
25%
1314
October1st to 10thNight
29%
720
19%
2160
9%
720
38%
720
22%
1428
October11th to 20thNight
24%
720
20%
2160
7%
720
35%
720
19%
1449
October21st to endNight
16%
792
15%
2407
4%
792
26%
792
12%
1750
November1st to 10thNight
18%
818
15%
2568
5%
818
29%
818
14%
1830
November11th to 20thNight
18%
850
16%
2660
6%
850
29%
850
12%
1904
November21st to endNight
14%
850
13%
2660
3%
850
25%
850
12%
1928
December1st to 10thNight
14%
850
14%
2660
2%
850
27%
850
11%
1972
December11th to 20thNight
9%
850
13%
3340
2%
849
22%
849
7%
2561
December21st to endNight
12%
931
8%
5193
1%
907
24%
907
4%
3738

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%10%47%6%3445%6%32%
78520
Night
18%11%47%6%3445%6%33%
81489
TransparencyDay
52%6%12%19%10%1
78217
Night
52%6%11%20%10%1
81327
SeeingDay
27%20%31%16%5%1
15880
Night
25%17%32%20%5%
23677

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
14%12%5%9%6%35%45%5%32%
2207
11th to 20thDay
13%14%5%8%6%34445%33%
2387
21st to endDay
12%11%5%9%9%3445%7%31%
3124
February1st to 10thDay
16%13%5%8%6%3445%6%30%
1710
11th to 20thDay
16%13%6%8%6%45%5%5%5%27%
1663
21st to endDay
12%12%6%8%5%435%5%7%34%
1430
March1st to 10thDay
17%18%6%7%5%3445%5%26%
2063
11th to 20thDay
14%11%6%9%7%45%446%29%
2090
21st to endDay
20%15%6%8%5%3243430%
2255
April1st to 10thDay
22%13%48%7%34446%25%
2129
11th to 20thDay
20%13%35%5%3445%7%31%
2266
21st to endDay
24%13%46%5%3435%7%27%
2340
May1st to 10thDay
25%11%47%6%35%445%25%
2394
11th to 20thDay
25%9%35%5%2345%6%33%
2478
21st to endDay
20%9%47%5%3446%7%32%
2724
June1st to 10thDay
29%8%26%5%45%45%7%25%
2661
11th to 20thDay
23%7%36%5%35%45%7%31%
2700
21st to endDay
27%9%47%5%35%446%27%
2700
July1st to 10thDay
19%6%25%6%36%5%6%8%34%
2700
11th to 20thDay
14%6%26%6%46%6%7%10%32%
2660
21st to endDay
17%8%47%7%46%6%6%8%28%
2675
August1st to 10thDay
17%5%36%6%45%5%6%8%34%
2327
11th to 20thDay
18%6%36%7%45%6%7%8%31%
2304
21st to endDay
15%6%36%5%4445%7%41%
2525
September1st to 10thDay
15%5%25%5%35%5%5%7%43%
2160
11th to 20thDay
19%7%35%5%3345%6%41%
2052
21st to endDay
19%7%25%434345%45%
1949
October1st to 10thDay
17%8%26%43445%8%40%
1800
11th to 20thDay
19%9%35%5%35%5%5%6%36%
1800
21st to endDay
20%9%47%6%3445%6%32%
1945
November1st to 10thDay
20%9%47%6%44446%33%
1508
11th to 20thDay
18%13%46%5%25%347%33%
1520
21st to endDay
18%13%47%7%25%346%31%
1520
December1st to 10thDay
24%13%5%6%5%24345%29%
1520
11th to 20thDay
17%19%5%9%5%3333428%
1803
21st to endDay
19%13%6%11%6%3434428%
2431
January1st to 10thNight
14%12%47%6%3445%6%36%
4748
11th to 20thNight
15%13%48%7%34446%31%
4577
21st to endNight
14%13%48%8%3335%6%32%
4532
February1st to 10thNight
17%12%47%6%35%5%5%6%30%
2470
11th to 20thNight
18%13%47%7%45%445%29%
2403
21st to endNight
14%13%5%7%6%35%346%34%
2022
March1st to 10thNight
18%15%48%6%34446%29%
2103
11th to 20thNight
16%13%47%7%5%4446%28%
2089
21st to endNight
19%14%5%8%5%3334431%
2256
April1st to 10thNight
24%13%5%8%5%3444426%
1830
11th to 20thNight
24%10%35%6%33345%34%
1641
21st to endNight
21%14%36%5%35%45%430%
1620
May1st to 10thNight
24%12%25%5%3446%5%29%
1565
11th to 20thNight
24%10%35%424446%34%
1416
21st to endNight
16%9%37%5%35%45%8%34%
1550
June1st to 10thNight
27%7%35%4345%6%8%29%
1314
11th to 20thNight
22%6%36%6%34447%35%
1260
21st to endNight
24%9%45%5%35%45%6%29%
1260
July1st to 10thNight
18%7%245%345%6%10%36%
1260
11th to 20thNight
14%7%46%5%35%5%7%8%36%
1278
21st to endNight
16%8%38%7%45%5%5%8%30%
1639
August1st to 10thNight
13%7%36%6%346%6%9%38%
1612
11th to 20thNight
16%8%37%5%35%5%5%8%35%
1596
21st to endNight
13%5%35%4346%5%8%43%
1831
September1st to 10thNight
16%5%25%43445%8%44%
1800
11th to 20thNight
17%6%35%423336%47%
1904
21st to endNight
17%6%25%5%24445%46%
2011
October1st to 10thNight
18%7%35%5%235%5%6%41%
2160
11th to 20thNight
18%8%35%5%345%47%38%
2160
21st to endNight
23%10%37%5%33445%33%
2407
November1st to 10thNight
20%9%36%5%345%5%6%34%
2568
11th to 20thNight
18%12%46%6%35%45%6%32%
2660
21st to endNight
21%10%46%5%44346%33%
2660
December1st to 10thNight
24%11%47%5%4445%5%29%
2660
11th to 20thNight
21%16%5%7%5%3433428%
3391
21st to endNight
23%14%5%9%6%2333429%
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
55%6%13%15%11%1
2208
11th to 20thDay
54%5%8%19%14%1
2387
21st to endDay
52%6%13%14%15%1
3124
February1st to 10thDay
56%5%11%16%11%2
1710
11th to 20thDay
59%5%9%15%10%1
1671
21st to endDay
50%411%21%12%2
1430
March1st to 10thDay
60%49%17%8%1
2067
11th to 20thDay
57%5%10%16%9%3
2090
21st to endDay
58%48%17%9%3
2255
April1st to 10thDay
61%5%8%14%10%3
2129
11th to 20thDay
53%6%9%19%11%1
2266
21st to endDay
58%5%9%15%10%3
2340
May1st to 10thDay
61%5%9%14%10%1
2394
11th to 20thDay
52%6%8%22%11%
2482
21st to endDay
52%6%12%22%8%1
2724
June1st to 10thDay
57%6%12%17%8%
2661
11th to 20thDay
52%6%12%20%9%1
2700
21st to endDay
58%6%11%16%9%1
2700
July1st to 10thDay
45%8%16%21%9%1
2625
11th to 20thDay
44%8%18%21%8%1
2579
21st to endDay
52%8%14%19%6%
2525
August1st to 10thDay
45%8%15%25%7%
2314
11th to 20thDay
47%9%16%21%6%
2304
21st to endDay
41%6%16%25%12%
2525
September1st to 10thDay
39%7%16%24%13%
2160
11th to 20thDay
44%6%11%25%14%1
2052
21st to endDay
42%410%28%15%1
1949
October1st to 10thDay
44%5%11%28%11%1
1800
11th to 20thDay
48%7%12%24%8%1
1800
21st to endDay
54%5%11%18%11%
1945
November1st to 10thDay
54%5%10%20%10%1
1508
11th to 20thDay
53%5%13%17%12%1
1520
21st to endDay
56%5%14%17%9%
1520
December1st to 10thDay
58%7%11%17%7%
1520
11th to 20thDay
62%5%8%15%9%1
1802
21st to endDay
60%5%13%13%7%1
2431
January1st to 10thNight
48%6%14%25%7%1
4748
11th to 20thNight
54%6%11%19%9%1
4577
21st to endNight
53%5%10%21%9%1
4532
February1st to 10thNight
55%5%12%15%11%2
2470
11th to 20thNight
57%5%9%15%13%1
2406
21st to endNight
52%5%10%18%13%2
2022
March1st to 10thNight
58%5%8%16%10%2
2112
11th to 20thNight
56%5%9%17%11%2
2090
21st to endNight
57%5%7%19%11%2
2256
April1st to 10thNight
60%6%8%13%10%3
1830
11th to 20thNight
52%411%20%13%1
1641
21st to endNight
56%5%10%15%13%1
1620
May1st to 10thNight
56%5%9%17%11%2
1565
11th to 20thNight
50%6%9%23%11%1
1417
21st to endNight
48%9%15%19%9%1
1551
June1st to 10thNight
54%6%12%19%8%
1314
11th to 20thNight
51%6%10%22%10%1
1260
21st to endNight
55%7%12%15%9%1
1260
July1st to 10thNight
43%8%16%25%8%
1225
11th to 20thNight
45%8%16%22%10%
1236
21st to endNight
51%8%15%18%7%
1549
August1st to 10thNight
42%10%16%24%8%
1600
11th to 20thNight
47%9%16%22%6%
1596
21st to endNight
38%8%17%27%10%
1831
September1st to 10thNight
39%7%13%30%12%
1800
11th to 20thNight
41%413%27%14%1
1904
21st to endNight
41%411%27%15%2
2011
October1st to 10thNight
44%5%10%27%13%
2160
11th to 20thNight
46%5%13%28%8%
2160
21st to endNight
55%5%10%18%11%1
2407
November1st to 10thNight
51%7%11%20%10%1
2568
11th to 20thNight
53%6%12%18%10%1
2660
21st to endNight
54%5%13%18%9%
2660
December1st to 10thNight
57%5%12%18%7%
2660
11th to 20thNight
61%5%7%17%10%
3393
21st to endNight
61%411%15%7%1
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
31%25%31%13%
180
11th to 20thDay
34%27%25%11%2
247
21st to endDay
21%21%39%15%3
407
February1st to 10thDay
26%26%29%14%4
370
11th to 20thDay
30%29%27%10%31
366
21st to endDay
23%24%35%13%4
316
March1st to 10thDay
29%27%32%10%11
460
11th to 20thDay
25%25%33%12%41
460
21st to endDay
33%26%28%10%31
490
April1st to 10thDay
36%28%26%8%2
420
11th to 20thDay
33%25%25%14%2
412
21st to endDay
31%24%28%13%4
420
May1st to 10thDay
35%22%25%15%3
477
11th to 20thDay
29%19%29%17%6%
624
21st to endDay
29%20%30%17%4
680
June1st to 10thDay
36%15%30%14%6%
630
11th to 20thDay
25%18%31%19%5%1
630
21st to endDay
26%16%29%23%5%1
630
July1st to 10thDay
23%13%35%21%7%1
620
11th to 20thDay
17%10%37%26%9%1
618
21st to endDay
21%12%38%22%7%
615
August1st to 10thDay
16%12%38%27%6%1
446
11th to 20thDay
21%11%33%23%9%1
439
21st to endDay
16%16%34%25%8%1
495
September1st to 10thDay
13%15%42%19%8%2
450
11th to 20thDay
25%16%31%20%8%1
450
21st to endDay
22%18%35%16%6%3
435
October1st to 10thDay
24%16%28%18%12%1
360
11th to 20thDay
25%21%29%19%6%1
360
21st to endDay
29%24%28%14%5%1
396
November1st to 10thDay
27%22%32%12%6%1
365
11th to 20thDay
32%22%29%12%41
370
21st to endDay
34%24%28%11%3
370
December1st to 10thDay
35%21%29%12%3
370
11th to 20thDay
39%27%24%9%1
304
21st to endDay
29%30%31%9%1
198
January1st to 10thNight
26%24%31%16%4
850
11th to 20thNight
27%22%30%17%4
827
21st to endNight
21%22%36%17%5%
836
February1st to 10thNight
27%21%33%16%3
760
11th to 20thNight
28%25%31%13%21
743
21st to endNight
21%23%32%20%3
628
March1st to 10thNight
27%19%36%17%1
760
11th to 20thNight
26%19%31%18%6%
760
21st to endNight
27%18%33%17%5%
821
April1st to 10thNight
33%19%29%17%3
570
11th to 20thNight
30%17%29%18%5%
534
21st to endNight
30%17%29%17%7%
540
May1st to 10thNight
31%14%28%22%41
540
11th to 20thNight
29%16%29%20%6%
532
21st to endNight
22%14%43%19%3
583
June1st to 10thNight
29%10%32%24%5%
414
11th to 20thNight
23%11%32%29%5%
360
21st to endNight
26%8%32%28%6%
360
July1st to 10thNight
20%7%41%24%7%
350
11th to 20thNight
17%8%37%29%9%
366
21st to endNight
17%9%37%30%6%
590
August1st to 10thNight
15%6%39%31%9%1
538
11th to 20thNight
19%10%32%29%10%1
532
21st to endNight
15%9%33%32%11%1
594
September1st to 10thNight
18%11%38%27%7%
540
11th to 20thNight
20%12%27%32%8%1
644
21st to endNight
21%12%33%25%8%
720
October1st to 10thNight
22%12%31%25%9%
720
11th to 20thNight
23%16%33%21%7%
720
21st to endNight
31%20%29%17%3
792
November1st to 10thNight
29%19%29%17%6%
818
11th to 20thNight
26%20%30%17%5%1
850
21st to endNight
28%23%30%16%3
850
December1st to 10thNight
31%19%29%17%4
850
11th to 20thNight
32%23%30%12%2
850
21st to endNight
32%23%26%17%21
935
Page generated at 2024-03-25 00:37:04. Version ac07

Copyright © 2024 Attilla Danko.


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