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 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%
14922
11%
46285
5%
14879
27%
14879
13%
34399

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%
743
7%
2560
3%
739
18%
739
7%
2055
January16th to endNight
13%
768
5%
2496
1%
768
17%
768
7%
2048
February1st to 15thNight
11%
702
5%
2286
1%
701
16%
701
6%
1893
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%
528
14%
1575
9%
524
38%
524
23%
1058
August16th to endNight
33%
525
18%
1608
10%
525
39%
525
26%
1003
September1st to 15thNight
28%
528
18%
1683
11%
528
38%
528
23%
1081
September16th to endNight
34%
657
24%
1820
14%
657
42%
657
27%
1173
October1st to 15thNight
26%
660
17%
1980
7%
660
36%
660
20%
1350
October16th to endNight
18%
704
14%
2118
4%
704
27%
704
15%
1514
November1st to 15thNight
26%
719
12%
2391
8%
719
31%
719
14%
1747
November16th to endNight
21%
750
10%
2520
5%
750
28%
750
10%
1867
December1st to 15thNight
12%
750
7%
2520
1%
750
18%
750
8%
1999
December16th to endNight
12%
800
7%
2740
2%
800
18%
800
6%
2244

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
22%9%46%5%34346%28%
47675
Night
21%9%47%6%3445%6%27%
46459
TransparencyDay
56%5%10%17%9%1
47367
Night
55%6%12%17%7%
46285
SeeingDay
30%15%28%17%6%1
7096
Night
27%14%31%19%5%
14924

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%
1371
16th to endDay
17%14%6%9%10%6%5%45%415%
1728
February1st to 15thDay
18%13%6%12%11%45%45%5%11%
1575
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%7%344346%5%6%34%
2288
16th to endDay
16%6%25%42445%8%40%
2242
September1st to 15thDay
20%5%25%423245%43%
1944
16th to endDay
18%6%24312346%44%
1810
October1st to 15thDay
21%7%35%323348%37%
1650
16th to endDay
26%9%36%5%33446%26%
1752
November1st to 15thDay
23%12%47%5%23346%26%
1467
16th to endDay
21%15%6%8%5%34445%20%
1440
December1st to 15thDay
28%10%5%11%7%24436%14%
1440
16th to endDay
23%14%6%11%8%3434413%
1476
January1st to 15thNight
18%12%5%10%9%35%5%5%6%16%
2560
16th to endNight
18%12%410%10%6%6%5%6%6%12%
2496
February1st to 15thNight
17%13%5%11%11%5%6%5%5%5%12%
2285
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%2441345%7%38%
1587
16th to endNight
15%42442445%6%45%
1608
September1st to 15thNight
17%6%34423448%40%
1683
16th to endNight
18%6%14223446%46%
1820
October1st to 15thNight
21%6%245%33346%38%
1980
16th to endNight
25%7%36%42335%6%31%
2118
November1st to 15thNight
21%9%46%6%245%5%6%26%
2391
16th to endNight
21%10%47%5%2445%6%25%
2520
December1st to 15thNight
24%11%5%8%6%45%447%17%
2520
16th to endNight
25%12%6%9%8%35%435%17%
2740

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%5%12%10%1
1372
16th to endDay
68%410%12%2
1728
February1st to 15thDay
70%6%12%7%2
1578
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%12%19%12%1
2275
16th to endDay
42%5%12%25%12%
2242
September1st to 15thDay
44%49%23%15%1
1944
16th to endDay
40%48%27%18%1
1810
October1st to 15thDay
46%5%11%21%13%1
1650
16th to endDay
58%5%10%17%7%
1752
November1st to 15thDay
59%411%15%7%1
1467
16th to endDay
64%5%11%13%4
1440
December1st to 15thDay
69%5%11%11%1
1440
16th to endDay
72%5%10%9%3
1476
January1st to 15thNight
65%7%13%11%2
2560
16th to endNight
67%6%14%9%2
2496
February1st to 15thNight
69%6%12%9%2
2286
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%
1575
16th to endNight
38%6%15%27%12%
1608
September1st to 15thNight
42%410%27%11%1
1683
16th to endNight
40%48%27%17%1
1820
October1st to 15thNight
46%5%11%21%12%1
1980
16th to endNight
52%5%11%21%9%
2118
November1st to 15thNight
53%7%14%17%6%
2391
16th to endNight
57%6%15%14%6%
2520
December1st to 15thNight
64%5%13%13%2
2520
16th to endNight
68%5%11%10%3
2740

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
30%17%35%12%3
139
16th to endDay
28%21%33%13%2
256
February1st to 15thDay
26%21%29%21%1
236
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%9%2
297
16th to endDay
21%9%27%22%17%1
268
September1st to 15thDay
26%9%32%21%8%2
255
16th to endDay
20%13%31%18%8%5%
253
October1st to 15thDay
26%9%31%18%10%3
225
16th to endDay
35%17%26%13%7%
240
November1st to 15thDay
26%14%28%20%6%2
235
16th to endDay
33%16%23%18%5%1
240
December1st to 15thDay
38%20%24%13%2
240
16th to endDay
37%21%23%12%3
196
January1st to 15thNight
28%17%33%17%2
743
16th to endNight
29%19%30%17%2
768
February1st to 15thNight
26%19%33%19%1
704
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%
528
16th to endNight
18%8%36%26%9%1
525
September1st to 15thNight
21%9%35%23%9%
528
16th to endNight
22%10%30%24%10%1
657
October1st to 15thNight
26%12%30%20%8%1
660
16th to endNight
29%16%31%17%4
704
November1st to 15thNight
26%14%27%23%7%1
719
16th to endNight
29%17%25%19%7%
750
December1st to 15thNight
34%17%29%14%3
750
16th to endNight
35%20%26%14%3
800
Page generated at 2017-08-13 15:16:43. Version ac04

Copyright 2017 A. Danko


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