Fundy National Park
Clear Sky Chart
History

This sumarizes the distribution of each different forecast outcome for the Fundy National Park clear sky chart from 2005-11-05 to 2017-08-12.

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%
14797
13%
46359
5%
14752
30%
14752
13%
33102

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
11%
750
13%
2685
1%
746
25%
746
8%
1878
January16th to endNight
13%
769
17%
2508
2%
769
30%
769
11%
1704
February1st to 15thNight
12%
704
11%
2286
3%
701
23%
701
10%
1614
February16th to endNight
13%
631
12%
2025
3%
631
24%
631
9%
1489
March1st to 15thNight
15%
720
15%
1998
4%
720
26%
720
14%
1472
March16th to endNight
16%
768
16%
2112
4%
768
26%
768
15%
1533
April1st to 15thNight
18%
568
13%
1789
6%
568
26%
568
12%
1327
April16th to endNight
20%
540
13%
1620
5%
540
28%
540
15%
1167
May1st to 15thNight
22%
540
9%
1543
5%
540
26%
540
13%
1170
May16th to endNight
21%
561
9%
1496
2%
560
27%
560
14%
1148
June1st to 15thNight
23%
405
7%
1305
4%
405
26%
405
10%
1007
June16th to endNight
31%
360
6%
1260
3%
360
35%
360
11%
936
July1st to 15thNight
37%
340
9%
1190
8%
340
41%
340
16%
807
July16th to endNight
31%
527
8%
1446
6%
494
35%
494
14%
1122
August1st to 15thNight
38%
528
9%
1575
6%
524
40%
524
17%
1136
August16th to endNight
40%
525
13%
1602
6%
525
45%
525
21%
1060
September1st to 15thNight
33%
515
15%
1670
10%
515
40%
515
19%
1102
September16th to endNight
33%
657
21%
1828
10%
657
42%
657
26%
1166
October1st to 15thNight
25%
660
18%
1980
8%
660
35%
660
18%
1336
October16th to endNight
17%
704
14%
2131
4%
704
27%
704
14%
1522
November1st to 15thNight
22%
725
14%
2423
7%
725
31%
725
14%
1677
November16th to endNight
18%
750
14%
2520
5%
750
29%
750
10%
1776
December1st to 15thNight
10%
750
14%
2520
2%
750
23%
750
8%
1829
December16th to endNight
8%
800
12%
2847
2%
800
21%
800
6%
2124

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
21%9%36%5%24446%30%
47610
Night
20%8%36%5%34446%32%
46527
TransparencyDay
53%5%12%19%9%
47296
Night
52%5%11%20%9%
46359
SeeingDay
23%21%25%19%7%1
6990
Night
21%27%24%18%6%
14797

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
15%14%46%5%23345%33%
1253
16th to endDay
16%10%47%434446%33%
1710
February1st to 15thDay
15%11%37%5%45%5%46%30%
1575
16th to endDay
13%16%5%8%7%2435%5%27%
1446
March1st to 15thDay
19%13%47%434335%30%
1951
16th to endDay
15%13%5%6%6%33345%31%
2112
April1st to 15thDay
20%14%5%7%6%24435%26%
2156
16th to endDay
22%11%45%5%23446%29%
2340
May1st to 15thDay
26%10%46%5%24435%26%
2407
16th to endDay
25%9%46%5%24345%27%
2618
June1st to 15thDay
28%9%37%5%34446%22%
2664
16th to endDay
26%8%35%5%23447%26%
2700
July1st to 15thDay
19%7%35%5%2446%8%33%
2700
16th to endDay
21%7%36%5%36%5%5%6%27%
2606
August1st to 15thDay
19%6%36%5%345%5%7%31%
2288
16th to endDay
16%7%245%25%5%6%6%36%
2248
September1st to 15thDay
18%7%25%434345%37%
1958
16th to endDay
18%424422335%47%
1801
October1st to 15thDay
20%7%25%423347%38%
1650
16th to endDay
23%7%37%4245%46%30%
1738
November1st to 15thDay
24%9%35%423445%32%
1435
16th to endDay
20%9%47%5%23336%30%
1440
December1st to 15thDay
28%10%35%323345%28%
1440
16th to endDay
20%14%6%6%423346%27%
1374
January1st to 15thNight
16%9%36%5%335%47%34%
2685
16th to endNight
16%10%35%5%24346%35%
2508
February1st to 15thNight
16%10%35%5%35%446%31%
2285
16th to endNight
16%13%6%7%5%34336%29%
2025
March1st to 15thNight
17%10%37%5%3445%6%29%
1986
16th to endNight
17%11%47%5%24435%32%
2112
April1st to 15thNight
23%10%37%5%34445%26%
1789
16th to endNight
20%8%45%5%35%346%32%
1620
May1st to 15thNight
23%8%46%5%35%45%5%27%
1543
16th to endNight
20%8%36%5%35%6%6%7%25%
1494
June1st to 15thNight
26%8%47%6%345%36%23%
1305
16th to endNight
24%7%36%6%245%5%6%26%
1260
July1st to 15thNight
14%8%35%5%35%47%7%33%
1260
16th to endNight
18%7%46%6%46%6%6%7%26%
1547
August1st to 15thNight
19%6%25%6%3446%6%32%
1587
16th to endNight
14%6%25%43445%8%39%
1602
September1st to 15thNight
18%6%34425%45%7%37%
1670
16th to endNight
16%5%23434336%46%
1828
October1st to 15thNight
21%6%25%5%23446%37%
1980
16th to endNight
24%7%35%5%23346%33%
2131
November1st to 15thNight
23%7%25%424445%33%
2423
16th to endNight
22%7%35%5%2345%7%32%
2520
December1st to 15thNight
26%10%35%42334430%
2520
16th to endNight
24%11%47%42434427%
2847

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
52%415%18%8%1
1254
16th to endDay
51%49%19%14%
1710
February1st to 15thDay
53%412%19%8%1
1578
16th to endDay
57%410%18%7%1
1446
March1st to 15thDay
57%210%17%10%1
1962
16th to endDay
53%39%19%11%2
2112
April1st to 15thDay
57%38%15%12%2
2156
16th to endDay
53%49%17%12%1
2340
May1st to 15thDay
60%48%17%8%
2407
16th to endDay
57%6%11%19%4
2622
June1st to 15thDay
61%411%15%6%
2664
16th to endDay
55%5%14%17%6%
2700
July1st to 15thDay
45%7%15%21%9%
2541
16th to endDay
53%6%15%19%5%
2445
August1st to 15thDay
48%7%16%20%7%
2275
16th to endDay
42%8%16%24%6%
2248
September1st to 15thDay
46%5%13%21%12%
1958
16th to endDay
40%49%29%15%1
1801
October1st to 15thDay
46%311%28%10%
1650
16th to endDay
53%312%19%10%
1738
November1st to 15thDay
53%413%16%11%1
1435
16th to endDay
55%411%18%10%
1440
December1st to 15thDay
57%311%21%5%
1440
16th to endDay
59%311%14%10%
1374
January1st to 15thNight
51%7%13%18%8%1
2685
16th to endNight
49%411%23%11%
2508
February1st to 15thNight
51%5%12%17%11%
2286
16th to endNight
57%312%15%9%1
2025
March1st to 15thNight
54%410%18%10%1
1998
16th to endNight
52%48%19%13%1
2112
April1st to 15thNight
57%49%14%11%3
1789
16th to endNight
53%411%16%13%
1620
May1st to 15thNight
57%5%10%17%8%
1543
16th to endNight
55%6%13%17%6%
1496
June1st to 15thNight
61%6%9%17%41
1305
16th to endNight
56%7%11%17%6%
1260
July1st to 15thNight
46%9%13%22%8%
1190
16th to endNight
53%11%11%16%6%
1446
August1st to 15thNight
49%8%15%20%6%
1575
16th to endNight
40%9%17%25%6%
1602
September1st to 15thNight
44%6%11%26%9%
1670
16th to endNight
39%413%28%13%
1828
October1st to 15thNight
46%411%26%11%
1980
16th to endNight
52%311%21%9%
2131
November1st to 15thNight
51%415%19%8%1
2423
16th to endNight
52%5%12%20%8%
2520
December1st to 15thNight
57%310%21%7%
2520
16th to endNight
60%48%18%7%
2847

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%26%36%13%
60
16th to endDay
17%29%34%15%3
247
February1st to 15thDay
20%31%22%19%5%
236
16th to endDay
18%27%31%17%4
216
March1st to 15thDay
20%30%32%12%4
270
16th to endDay
22%28%26%16%41
288
April1st to 15thDay
24%28%30%11%5%
270
16th to endDay
21%27%25%16%8%1
270
May1st to 15thDay
31%19%22%18%5%2
363
16th to endDay
24%21%27%19%6%
519
June1st to 15thDay
28%20%23%19%6%1
495
16th to endDay
27%17%22%20%9%2
495
July1st to 15thDay
23%15%22%24%12%1
475
16th to endDay
20%14%23%28%12%1
441
August1st to 15thDay
21%11%25%25%14%2
297
16th to endDay
18%13%20%27%16%2
268
September1st to 15thDay
18%14%24%29%10%2
255
16th to endDay
15%17%27%28%9%1
251
October1st to 15thDay
23%21%20%20%11%2
225
16th to endDay
25%23%28%14%6%
240
November1st to 15thDay
25%23%24%17%6%2
235
16th to endDay
24%32%24%13%4
240
December1st to 15thDay
31%30%23%12%2
240
16th to endDay
35%25%26%10%11
94
January1st to 15thNight
18%40%24%13%3
750
16th to endNight
18%36%27%14%3
769
February1st to 15thNight
21%33%29%14%1
704
16th to endNight
22%32%25%14%3
631
March1st to 15thNight
20%31%27%16%2
720
16th to endNight
20%32%25%15%5%
768
April1st to 15thNight
22%28%23%20%5%
568
16th to endNight
20%26%26%20%5%
540
May1st to 15thNight
25%23%23%18%7%1
540
16th to endNight
19%25%26%20%6%
561
June1st to 15thNight
23%21%24%25%5%
405
16th to endNight
23%21%15%27%11%
360
July1st to 15thNight
18%16%19%33%11%
340
16th to endNight
18%21%17%29%11%
527
August1st to 15thNight
19%15%19%25%19%
528
16th to endNight
15%13%24%27%16%2
525
September1st to 15thNight
20%16%24%28%9%
515
16th to endNight
17%18%26%22%12%1
657
October1st to 15thNight
22%19%27%20%8%1
660
16th to endNight
26%25%26%16%5%
704
November1st to 15thNight
22%28%22%17%8%1
725
16th to endNight
21%34%20%16%6%
750
December1st to 15thNight
27%35%22%12%2
750
16th to endNight
28%35%22%10%3
800
Page generated at 2017-08-13 15:16:31. Version ac04

Copyright 2017 A. Danko


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