Moncton
Clear Sky Chart
History

This sumarizes the distribution of each different forecast outcome for the Moncton clear sky chart from 2005-11-05 to 2018-02-22.

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
21%
15585
13%
48820
5%
15540
30%
15540
15%
34851

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
12%
825
12%
2910
1%
821
25%
821
8%
2102
January16th to endNight
15%
839
18%
2753
4%
839
32%
839
14%
1866
February1st to 15thNight
15%
764
11%
2481
3%
761
25%
761
13%
1786
February16th to endNight
16%
659
11%
2128
2%
659
27%
659
10%
1607
March1st to 15thNight
16%
720
14%
1995
4%
720
25%
720
14%
1501
March16th to endNight
18%
768
15%
2112
4%
768
27%
768
15%
1572
April1st to 15thNight
17%
558
12%
1782
6%
558
25%
558
12%
1343
April16th to endNight
22%
540
14%
1620
6%
540
30%
540
17%
1154
May1st to 15thNight
24%
540
9%
1523
4%
540
29%
540
15%
1163
May16th to endNight
20%
561
10%
1496
2%
560
27%
560
16%
1124
June1st to 15thNight
23%
396
7%
1296
4%
396
27%
396
13%
974
June16th to endNight
29%
360
7%
1260
4%
360
33%
360
14%
902
July1st to 15thNight
32%
340
11%
1190
7%
340
40%
340
21%
764
July16th to endNight
28%
518
8%
1414
5%
485
32%
485
17%
1034
August1st to 15thNight
34%
539
9%
1608
6%
535
37%
535
18%
1159
August16th to endNight
33%
573
15%
1752
8%
573
39%
573
24%
1143
September1st to 15thNight
30%
549
16%
1809
9%
549
40%
549
23%
1142
September16th to endNight
34%
717
22%
2001
12%
717
44%
717
29%
1263
October1st to 15thNight
27%
720
19%
2160
8%
720
37%
720
23%
1412
October16th to endNight
18%
768
16%
2325
5%
768
29%
768
14%
1652
November1st to 15thNight
21%
801
13%
2648
6%
801
29%
801
13%
1895
November16th to endNight
19%
825
14%
2730
5%
825
30%
825
12%
1966
December1st to 15thNight
12%
825
13%
2730
1%
825
25%
825
10%
1995
December16th to endNight
10%
880
13%
3097
1%
880
24%
880
7%
2332

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
20%9%36%5%34446%30%
49435
Night
18%9%36%5%34446%33%
48985
TransparencyDay
53%5%11%18%9%
49118
Night
52%5%11%19%9%
48820
SeeingDay
25%18%30%18%6%
7615
Night
24%16%32%20%5%
15585

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
13%14%5%9%5%24345%30%
1358
16th to endDay
13%12%38%5%3345%6%33%
1821
February1st to 15thDay
16%11%5%7%5%3435%7%29%
1710
16th to endDay
14%13%6%9%5%33446%27%
1490
March1st to 15thDay
17%14%5%8%5%34345%27%
1954
16th to endDay
17%12%6%8%5%2333432%
2112
April1st to 15thDay
19%12%47%7%34446%25%
2163
16th to endDay
23%10%35%423346%31%
2340
May1st to 15thDay
26%9%36%5%3334427%
2428
16th to endDay
24%10%36%5%2345%6%27%
2618
June1st to 15thDay
30%8%25%5%34346%24%
2674
16th to endDay
26%8%46%425%447%25%
2700
July1st to 15thDay
16%5%26%5%35%5%6%9%33%
2700
16th to endDay
17%7%37%6%46%5%6%8%25%
2639
August1st to 15thDay
19%6%35%6%45%46%8%30%
2340
16th to endDay
16%5%25%5%4445%7%38%
2450
September1st to 15thDay
18%6%245%24446%39%
2148
16th to endDay
17%6%24423236%46%
1959
October1st to 15thDay
18%9%25%323347%40%
1800
16th to endDay
20%7%36%5%34445%33%
1896
November1st to 15thDay
21%10%36%424346%31%
1540
16th to endDay
16%11%47%6%35%346%29%
1560
December1st to 15thDay
23%13%5%6%41434428%
1560
16th to endDay
21%16%45%5%14236%28%
1475
January1st to 15thNight
14%11%46%7%3445%5%30%
2910
16th to endNight
15%10%36%5%33346%36%
2753
February1st to 15thNight
16%12%46%5%3445%6%30%
2480
16th to endNight
17%14%47%6%35%335%27%
2128
March1st to 15thNight
18%11%37%6%34336%28%
1983
16th to endNight
18%13%5%7%43323432%
2112
April1st to 15thNight
22%11%47%6%3344427%
1782
16th to endNight
21%11%3442435%434%
1620
May1st to 15thNight
24%10%25%5%3446%6%26%
1523
16th to endNight
19%9%36%5%3445%7%30%
1494
June1st to 15thNight
27%7%36%5%3445%7%26%
1296
16th to endNight
21%8%35%5%25%46%7%29%
1260
July1st to 15thNight
13%6%24435%6%7%10%36%
1260
16th to endNight
16%8%37%7%35%45%7%30%
1512
August1st to 15thNight
16%7%36%6%345%48%33%
1620
16th to endNight
13%5%25%4345%5%8%40%
1752
September1st to 15thNight
17%6%24323438%42%
1809
16th to endNight
12%5%24423345%50%
2001
October1st to 15thNight
16%6%25%424447%41%
2160
16th to endNight
23%8%36%423345%34%
2325
November1st to 15thNight
20%9%35%5%3345%5%32%
2648
16th to endNight
18%9%36%6%34335%33%
2730
December1st to 15thNight
22%10%36%5%3434430%
2730
16th to endNight
23%13%5%5%42333428%
3097

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
55%6%11%15%9%1
1359
16th to endDay
51%5%9%17%15%
1821
February1st to 15thDay
55%5%11%17%8%1
1713
16th to endDay
58%410%16%8%1
1490
March1st to 15thDay
59%48%16%9%1
1965
16th to endDay
56%49%18%9%2
2112
April1st to 15thDay
59%5%7%14%11%1
2163
16th to endDay
54%49%17%11%2
2340
May1st to 15thDay
59%47%17%9%
2428
16th to endDay
58%5%10%19%6%
2622
June1st to 15thDay
60%5%11%15%6%
2674
16th to endDay
57%6%11%16%6%
2700
July1st to 15thDay
44%7%16%20%10%
2541
16th to endDay
53%7%15%17%5%
2475
August1st to 15thDay
50%6%13%21%7%
2327
16th to endDay
43%7%17%23%8%
2450
September1st to 15thDay
45%6%14%22%11%
2148
16th to endDay
40%410%28%15%1
1959
October1st to 15thDay
44%5%11%28%9%
1800
16th to endDay
53%5%10%20%9%
1896
November1st to 15thDay
55%5%13%14%11%
1540
16th to endDay
55%6%13%16%8%
1560
December1st to 15thDay
59%6%10%16%6%
1560
16th to endDay
59%310%13%12%
1475
January1st to 15thNight
54%6%10%17%8%1
2910
16th to endNight
49%411%23%10%
2753
February1st to 15thNight
54%412%17%11%
2481
16th to endNight
59%410%14%9%1
2128
March1st to 15thNight
56%48%18%10%1
1995
16th to endNight
56%38%19%11%1
2112
April1st to 15thNight
58%48%13%11%2
1782
16th to endNight
52%310%17%14%
1620
May1st to 15thNight
57%5%10%17%7%
1523
16th to endNight
52%8%13%18%7%
1496
June1st to 15thNight
58%5%11%16%6%1
1296
16th to endNight
52%8%13%17%7%
1260
July1st to 15thNight
40%9%16%25%8%
1190
16th to endNight
51%7%15%17%7%
1414
August1st to 15thNight
49%8%14%19%7%
1608
16th to endNight
40%8%17%26%7%
1752
September1st to 15thNight
40%5%12%29%11%
1809
16th to endNight
37%414%28%14%1
2001
October1st to 15thNight
43%411%30%10%
2160
16th to endNight
52%410%21%9%
2325
November1st to 15thNight
53%5%13%17%9%
2648
16th to endNight
53%5%12%17%8%
2730
December1st to 15thNight
56%410%19%7%
2730
16th to endNight
60%47%15%10%1
3097

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
23%32%36%7%
90
16th to endDay
22%24%36%14%2
285
February1st to 15thDay
22%25%31%14%4
281
16th to endDay
22%23%33%14%5%
234
March1st to 15thDay
24%26%31%15%11
270
16th to endDay
28%22%28%14%31
288
April1st to 15thDay
26%29%26%14%3
270
16th to endDay
25%24%31%12%5%1
270
May1st to 15thDay
34%18%22%17%5%1
384
16th to endDay
30%17%29%17%4
519
June1st to 15thDay
35%14%27%16%5%
495
16th to endDay
25%14%30%21%6%1
495
July1st to 15thDay
20%11%34%24%8%1
475
16th to endDay
21%9%32%26%10%
467
August1st to 15thDay
20%10%34%24%7%1
313
16th to endDay
16%14%32%25%10%1
332
September1st to 15thDay
18%11%39%23%6%
315
16th to endDay
18%11%37%22%7%2
309
October1st to 15thDay
25%12%30%17%12%2
270
16th to endDay
27%23%27%12%7%1
288
November1st to 15thDay
27%21%25%13%9%2
280
16th to endDay
25%21%32%14%5%
285
December1st to 15thDay
31%25%29%10%2
285
16th to endDay
32%32%26%8%
115
January1st to 15thNight
23%26%31%15%3
825
16th to endNight
23%20%34%15%4
839
February1st to 15thNight
24%19%36%16%3
764
16th to endNight
27%22%27%17%31
659
March1st to 15thNight
25%19%33%18%2
720
16th to endNight
25%17%31%17%7%
768
April1st to 15thNight
29%18%28%18%5%
558
16th to endNight
29%14%30%19%5%
540
May1st to 15thNight
30%14%28%20%6%
540
16th to endNight
24%13%37%19%4
561
June1st to 15thNight
29%7%32%25%5%
396
16th to endNight
22%8%33%27%7%
360
July1st to 15thNight
16%441%28%8%
340
16th to endNight
18%9%37%26%7%
518
August1st to 15thNight
20%5%33%28%12%1
539
16th to endNight
16%7%37%27%10%
573
September1st to 15thNight
19%10%34%28%6%
549
16th to endNight
16%11%34%28%8%
717
October1st to 15thNight
21%12%34%21%9%
720
16th to endNight
30%18%27%18%4
768
November1st to 15thNight
26%16%31%17%6%1
801
16th to endNight
23%22%28%19%4
825
December1st to 15thNight
30%22%29%14%3
825
16th to endNight
33%23%24%13%31
880
Page generated at 2018-02-23 12:21:35. Version ac04

Copyright 2018 A. Danko


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