Kejimkujik National Park
Clear Sky Chart
History

This sumarizes the distribution of each different forecast outcome for the Kejimkujik National Park clear sky chart from 2005-11-05 to 2018-02-14.

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%
15705
11%
48613
5%
15662
27%
15662
13%
36119

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
13%
815
7%
2775
3%
811
18%
811
7%
2243
January16th to endNight
13%
832
5%
2704
1%
832
17%
832
7%
2219
February1st to 15thNight
11%
758
5%
2466
1%
757
16%
757
6%
2044
February16th to endNight
15%
631
7%
2006
2%
631
21%
631
9%
1596
March1st to 15thNight
16%
720
13%
1995
4%
720
25%
720
13%
1525
March16th to endNight
17%
768
12%
2112
3%
768
25%
768
15%
1573
April1st to 15thNight
15%
578
14%
1808
4%
578
25%
578
12%
1343
April16th to endNight
18%
540
14%
1620
4%
540
26%
540
16%
1160
May1st to 15thNight
19%
540
11%
1584
4%
540
25%
540
14%
1204
May16th to endNight
20%
561
10%
1496
3%
560
27%
560
17%
1127
June1st to 15thNight
18%
471
8%
1371
3%
471
23%
471
13%
1044
June16th to endNight
23%
360
9%
1260
2%
360
32%
360
15%
896
July1st to 15thNight
29%
354
11%
1204
7%
354
37%
354
21%
780
July16th to endNight
31%
565
10%
1532
7%
532
35%
532
21%
1119
August1st to 15thNight
35%
539
14%
1608
9%
535
39%
535
23%
1081
August16th to endNight
32%
573
19%
1755
11%
573
40%
573
26%
1099
September1st to 15thNight
27%
576
18%
1836
10%
576
38%
576
24%
1160
September16th to endNight
34%
717
23%
1986
13%
717
42%
717
26%
1291
October1st to 15thNight
28%
720
17%
2160
8%
720
37%
720
21%
1458
October16th to endNight
20%
768
16%
2311
6%
768
29%
768
16%
1624
November1st to 15thNight
26%
789
11%
2596
8%
789
31%
789
14%
1902
November16th to endNight
20%
825
10%
2730
4%
825
28%
825
10%
2032
December1st to 15thNight
12%
825
7%
2730
1%
825
18%
825
8%
2168
December16th to endNight
11%
880
7%
2968
2%
880
18%
880
6%
2431

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%46%5%34346%29%
49450
Night
20%9%47%6%3445%6%27%
48787
TransparencyDay
55%5%10%17%9%1
49142
Night
55%6%12%17%7%
48613
SeeingDay
30%15%29%17%6%1
7692
Night
27%14%31%19%5%
15707

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
18%15%7%10%9%4445%5%13%
1486
16th to endDay
18%13%6%9%10%6%5%45%415%
1872
February1st to 15thDay
19%14%6%12%10%45%45%5%11%
1696
16th to endDay
14%14%7%11%7%35%35%5%21%
1464
March1st to 15thDay
19%13%6%8%6%3423425%
1954
16th to endDay
18%11%6%9%6%3233429%
2112
April1st to 15thDay
23%15%35%41334429%
2139
16th to endDay
24%8%35%323435%35%
2340
May1st to 15thDay
27%8%36%5%24336%28%
2368
16th to endDay
26%7%35%42435%6%30%
2618
June1st to 15thDay
28%9%35%424346%27%
2598
16th to endDay
23%7%26%5%44446%30%
2700
July1st to 15thDay
20%6%3442445%7%37%
2670
16th to endDay
22%7%35%5%3445%7%29%
2529
August1st to 15thDay
19%6%344346%5%7%34%
2340
16th to endDay
16%6%1442445%7%41%
2447
September1st to 15thDay
19%5%25%423345%43%
2121
16th to endDay
18%6%25%322346%44%
1974
October1st to 15thDay
20%7%35%323348%38%
1800
16th to endDay
24%8%36%5%33446%29%
1911
November1st to 15thDay
21%12%46%5%33447%25%
1592
16th to endDay
20%15%6%8%5%34345%21%
1560
December1st to 15thDay
28%11%5%11%7%24335%14%
1560
16th to endDay
23%14%6%11%9%4444413%
1599
January1st to 15thNight
18%12%5%10%9%35%5%5%6%15%
2775
16th to endNight
18%12%5%9%10%6%6%5%6%6%13%
2704
February1st to 15thNight
18%13%5%11%10%5%6%5%5%5%12%
2465
16th to endNight
14%13%5%10%10%45%5%5%419%
2006
March1st to 15thNight
20%10%47%7%35%345%27%
1983
16th to endNight
18%9%5%7%5%34446%30%
2112
April1st to 15thNight
24%10%245%3345%5%28%
1808
16th to endNight
23%9%26%425%345%33%
1620
May1st to 15thNight
26%8%36%434346%28%
1584
16th to endNight
23%7%35%325%45%6%31%
1494
June1st to 15thNight
31%7%34424447%27%
1371
16th to endNight
21%8%35%5%2435%8%31%
1260
July1st to 15thNight
16%6%244245%410%36%
1275
16th to endNight
18%6%36%435%5%6%7%31%
1638
August1st to 15thNight
18%6%245%1345%7%38%
1620
16th to endNight
16%5%24424446%45%
1755
September1st to 15thNight
17%6%24423448%41%
1836
16th to endNight
17%6%24223446%44%
1986
October1st to 15thNight
21%6%245%33346%40%
2160
16th to endNight
24%7%25%32335%6%32%
2311
November1st to 15thNight
21%9%46%6%245%5%6%26%
2596
16th to endNight
20%11%47%6%2445%6%25%
2730
December1st to 15thNight
24%12%48%6%44447%17%
2730
16th to endNight
24%12%6%9%8%45%435%16%
2968

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
69%6%12%10%1
1487
16th to endDay
68%411%12%2
1872
February1st to 15thDay
71%5%11%7%2
1699
16th to endDay
63%5%11%14%4
1464
March1st to 15thDay
63%29%15%7%1
1965
16th to endDay
58%38%18%9%1
2112
April1st to 15thDay
57%47%15%13%1
2139
16th to endDay
51%310%18%13%2
2340
May1st to 15thDay
58%38%16%9%2
2368
16th to endDay
53%6%10%19%8%1
2622
June1st to 15thDay
59%49%16%9%1
2598
16th to endDay
53%7%10%16%11%
2700
July1st to 15thDay
45%6%13%21%12%1
2513
16th to endDay
52%6%11%20%8%
2372
August1st to 15thDay
47%7%11%19%12%1
2327
16th to endDay
41%5%12%24%14%
2447
September1st to 15thDay
43%49%24%15%1
2121
16th to endDay
41%48%26%17%1
1974
October1st to 15thDay
45%5%11%23%13%1
1800
16th to endDay
55%5%10%19%8%
1911
November1st to 15thDay
58%5%12%15%7%1
1592
16th to endDay
63%5%12%14%4
1560
December1st to 15thDay
69%5%11%11%1
1560
16th to endDay
72%410%9%3
1599
January1st to 15thNight
65%7%13%11%2
2775
16th to endNight
67%6%14%9%2
2704
February1st to 15thNight
69%6%12%9%2
2466
16th to endNight
63%6%12%12%4
2006
March1st to 15thNight
58%311%16%8%
1995
16th to endNight
54%5%12%16%10%1
2112
April1st to 15thNight
56%5%8%16%11%1
1808
16th to endNight
53%49%18%12%1
1620
May1st to 15thNight
57%5%9%18%7%
1584
16th to endNight
52%7%11%19%7%
1496
June1st to 15thNight
57%5%12%18%5%
1371
16th to endNight
52%7%12%18%9%
1260
July1st to 15thNight
42%8%16%22%10%
1204
16th to endNight
48%8%14%21%6%
1532
August1st to 15thNight
44%6%14%24%10%
1608
16th to endNight
38%6%14%27%12%
1755
September1st to 15thNight
41%410%28%12%1
1836
16th to endNight
40%49%26%17%1
1986
October1st to 15thNight
45%5%11%22%13%1
2160
16th to endNight
50%5%11%22%9%
2311
November1st to 15thNight
53%7%14%17%6%
2596
16th to endNight
57%6%15%14%6%
2730
December1st to 15thNight
64%5%14%13%2
2730
16th to endNight
68%5%11%10%4
2968

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
29%23%32%11%2
176
16th to endDay
29%21%33%12%2
304
February1st to 15thDay
30%20%28%18%1
277
16th to endDay
24%20%30%20%4
220
March1st to 15thDay
32%22%26%12%5%
270
16th to endDay
34%20%25%10%8%1
288
April1st to 15thDay
35%20%29%10%4
270
16th to endDay
30%19%29%14%5%1
270
May1st to 15thDay
33%20%25%12%6%
324
16th to endDay
36%13%28%15%41
519
June1st to 15thDay
35%12%29%18%3
495
16th to endDay
31%12%28%19%5%1
495
July1st to 15thDay
25%10%29%22%10%1
475
16th to endDay
26%10%30%23%7%1
390
August1st to 15thDay
23%10%32%21%8%2
313
16th to endDay
21%9%28%22%15%1
332
September1st to 15thDay
24%11%34%20%6%1
315
16th to endDay
22%13%30%17%10%5%
312
October1st to 15thDay
24%10%32%18%10%3
270
16th to endDay
32%19%25%13%7%
288
November1st to 15thDay
25%16%28%20%5%2
280
16th to endDay
31%17%27%16%5%1
285
December1st to 15thDay
40%20%23%12%2
285
16th to endDay
39%23%22%11%2
239
January1st to 15thNight
28%19%33%16%2
815
16th to endNight
29%20%30%17%2
832
February1st to 15thNight
28%18%32%18%1
760
16th to endNight
24%17%36%17%4
631
March1st to 15thNight
28%20%28%20%3
720
16th to endNight
26%18%32%17%5%
768
April1st to 15thNight
34%14%32%14%3
578
16th to endNight
30%16%32%16%4
540
May1st to 15thNight
32%11%32%17%5%
540
16th to endNight
29%12%35%19%3
561
June1st to 15thNight
32%12%32%18%4
471
16th to endNight
27%8%36%17%9%
360
July1st to 15thNight
17%7%42%23%9%
354
16th to endNight
20%6%37%29%5%
565
August1st to 15thNight
20%6%31%30%10%
539
16th to endNight
18%8%36%25%9%1
573
September1st to 15thNight
21%10%36%23%8%
576
16th to endNight
22%10%29%23%11%1
717
October1st to 15thNight
25%11%31%22%8%1
720
16th to endNight
28%16%30%18%6%
768
November1st to 15thNight
26%14%27%22%7%1
789
16th to endNight
28%18%26%19%6%
825
December1st to 15thNight
35%17%29%14%3
825
16th to endNight
34%21%26%14%2
880
Page generated at 2018-02-15 11:58:49. Version ac04

Copyright 2018 A. Danko


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