Wapinita Airstrip
Clear Sky Chart
History

This sumarizes the distribution of each different forecast outcome for the Wapinita Airstrip clear sky chart from 2005-11-05 to 2018-10-08.

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
54%
15972
17%
51036
15%
15947
58%
15947
26%
32084

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
34%
776
7%
2716
6%
776
36%
776
10%
2130
January16th to endNight
41%
832
10%
2850
9%
832
44%
832
14%
2095
February1st to 15thNight
45%
757
10%
2483
9%
756
47%
756
16%
1820
February16th to endNight
42%
684
14%
2121
11%
684
47%
684
19%
1473
March1st to 15thNight
45%
780
11%
2269
8%
780
48%
780
19%
1615
March16th to endNight
45%
832
11%
2213
5%
832
49%
832
20%
1610
April1st to 15thNight
43%
779
12%
1949
5%
779
45%
779
24%
1396
April16th to endNight
51%
694
16%
1852
8%
694
54%
694
30%
1211
May1st to 15thNight
59%
389
22%
1559
25%
389
65%
389
30%
803
May16th to endNight
65%
406
13%
1624
16%
406
71%
406
26%
887
June1st to 15thNight
59%
390
13%
1560
18%
390
65%
390
26%
868
June16th to endNight
59%
390
17%
1560
25%
390
65%
390
38%
713
July1st to 15thNight
82%
370
23%
1480
35%
370
88%
370
63%
509
July16th to endNight
82%
408
32%
1544
41%
386
91%
386
66%
518
August1st to 15thNight
87%
496
34%
1642
34%
494
90%
494
66%
636
August16th to endNight
80%
761
37%
2003
25%
761
82%
761
71%
924
September1st to 15thNight
82%
780
37%
1950
23%
780
84%
780
74%
911
September16th to endNight
73%
776
30%
2118
25%
776
75%
776
48%
1152
October1st to 15thNight
58%
752
20%
2256
18%
752
63%
752
34%
1352
October16th to endNight
55%
768
19%
2374
18%
768
59%
768
26%
1540
November1st to 15thNight
45%
760
11%
2541
11%
760
47%
760
16%
1843
November16th to endNight
43%
780
10%
2730
8%
780
48%
780
17%
1894
December1st to 15thNight
42%
780
10%
2730
10%
780
45%
780
14%
2014
December16th to endNight
35%
832
10%
2912
8%
832
39%
832
13%
2170

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
5%5%35%5%35%5%5%7%46%
52123
Night
5%6%36%5%35%5%6%7%45%
51204
Cloud CoverDay
5%6%25%5%35%45%7%48%
52123
Night
6%6%35%5%3445%7%46%
51208
TransparencyDay
35%7%13%22%15%5%
51794
Night
37%8%15%21%12%4
51037
SeeingDay
8%15%26%27%15%5%
6885
Night
8%7%21%36%22%3
15985

By Month

Percentage Cloud Cover NW (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
9%12%6%10%10%5%7%5%5%8%18%
1552
16th to endDay
8%11%5%8%8%46%5%5%8%27%
1723
February1st to 15thDay
8%10%47%8%36%7%6%9%27%
1711
16th to endDay
6%8%47%7%46%7%6%8%31%
1639
March1st to 15thDay
7%9%5%8%8%46%7%7%9%26%
2019
16th to endDay
6%8%49%9%5%8%6%6%8%26%
2363
April1st to 15thDay
8%9%47%7%47%5%6%8%30%
2329
16th to endDay
5%6%25%7%35%6%6%9%41%
2381
May1st to 15thDay
4426%6%345%6%7%48%
2721
16th to endDay
8%5%35%6%35%5%6%8%42%
2839
June1st to 15thDay
6%435%435%46%8%47%
2730
16th to endDay
4213323447%60%
2730
July1st to 15thDay
12212326%76%
2730
16th to endDay
2111222478%
2881
August1st to 15thDay
1121235%5%75%
2561
16th to endDay
112212235%74%
2551
September1st to 15thDay
112222235%75%
2340
16th to endDay
442442445%6%56%
2171
October1st to 15thDay
7%5%36%425%6%7%7%43%
1873
16th to endDay
7%7%25%6%35%6%5%7%41%
1848
November1st to 15thDay
6%9%48%8%48%6%7%8%27%
1647
16th to endDay
7%9%5%8%8%5%8%8%7%8%22%
1560
December1st to 15thDay
8%12%5%8%8%46%5%6%5%27%
1560
16th to endDay
9%9%5%9%8%5%8%6%7%8%21%
1664
January1st to 15thNight
7%12%5%11%9%46%5%7%8%21%
2716
16th to endNight
8%8%5%8%7%5%6%6%6%8%28%
2850
February1st to 15thNight
7%10%48%6%45%6%6%9%30%
2471
16th to endNight
6%8%36%7%35%5%7%9%35%
2121
March1st to 15thNight
8%6%47%6%36%6%7%9%32%
2269
16th to endNight
5%5%37%7%47%6%8%10%32%
2209
April1st to 15thNight
8%5%36%6%45%5%6%8%37%
1949
16th to endNight
5%4245%25%5%6%9%47%
1852
May1st to 15thNight
431443446%7%53%
1559
16th to endNight
4424426%7%6%10%47%
1624
June1st to 15thNight
8%43432446%6%51%
1560
16th to endNight
3214323336%63%
1560
July1st to 15thNight
111223479%
1560
16th to endNight
1111222481%
1640
August1st to 15thNight
11112235%78%
1650
16th to endNight
11111123479%
2003
September1st to 15thNight
111223481%
1950
16th to endNight
321342435%7%60%
2118
October1st to 15thNight
6%426%43445%7%51%
2256
16th to endNight
8%5%25%6%345%5%7%44%
2374
November1st to 15thNight
7%7%38%7%47%7%8%7%30%
2541
16th to endNight
6%8%47%7%46%6%7%8%33%
2730
December1st to 15thNight
7%11%5%8%7%45%5%5%8%29%
2730
16th to endNight
9%9%5%9%8%45%6%6%7%28%
2912

Percentage Cloud Cover SW (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
10%13%5%9%8%48%5%6%7%20%
1552
16th to endDay
8%11%48%7%5%6%6%5%8%26%
1723
February1st to 15thDay
7%10%47%6%46%6%7%10%28%
1711
16th to endDay
7%7%47%7%36%6%6%9%32%
1639
March1st to 15thDay
7%10%47%7%47%6%8%8%27%
2019
16th to endDay
7%8%47%9%5%7%6%7%8%27%
2363
April1st to 15thDay
8%9%47%6%46%6%6%7%33%
2329
16th to endDay
5%6%25%5%35%5%6%9%44%
2381
May1st to 15thDay
5%425%5%245%5%6%51%
2721
16th to endDay
8%6%25%5%3446%8%44%
2839
June1st to 15thDay
6%435%5%25%45%7%50%
2730
16th to endDay
4213424336%61%
2730
July1st to 15thDay
12112245%77%
2730
16th to endDay
21111123479%
2881
August1st to 15thDay
11212347%75%
2561
16th to endDay
11121223476%
2551
September1st to 15thDay
11121222477%
2340
16th to endDay
5%3234245%5%6%56%
2171
October1st to 15thDay
7%5%25%6%25%5%7%8%43%
1873
16th to endDay
7%6%26%6%35%5%7%8%40%
1848
November1st to 15thDay
8%8%48%6%47%6%7%7%29%
1647
16th to endDay
7%11%48%8%48%7%8%8%22%
1560
December1st to 15thDay
9%12%5%9%6%45%5%6%6%27%
1560
16th to endDay
10%11%49%8%48%5%7%8%21%
1664
January1st to 15thNight
8%13%6%10%8%35%5%6%8%21%
2716
16th to endNight
10%9%48%7%46%6%6%7%27%
2850
February1st to 15thNight
7%11%48%5%35%5%6%8%32%
2471
16th to endNight
7%9%45%6%35%6%6%8%36%
2121
March1st to 15thNight
7%6%37%7%36%5%7%9%34%
2269
16th to endNight
5%7%25%7%5%7%6%8%11%33%
2213
April1st to 15thNight
9%5%26%6%36%6%5%8%38%
1949
16th to endNight
6%6%145%345%5%8%49%
1852
May1st to 15thNight
431343445%6%56%
1559
16th to endNight
442332446%10%50%
1624
June1st to 15thNight
8%32332445%6%53%
1560
16th to endNight
3313323345%65%
1560
July1st to 15thNight
11223480%
1560
16th to endNight
1111222482%
1640
August1st to 15thNight
1212235%80%
1650
16th to endNight
1121212480%
2003
September1st to 15thNight
111113482%
1950
16th to endNight
421232336%7%62%
2118
October1st to 15thNight
6%5%245%34346%52%
2256
16th to endNight
8%425%6%35%5%6%6%45%
2374
November1st to 15thNight
8%7%36%7%46%6%7%9%31%
2541
16th to endNight
7%8%5%7%5%45%6%7%8%34%
2730
December1st to 15thNight
7%12%5%8%7%46%45%8%28%
2730
16th to endNight
9%10%5%9%7%46%5%5%8%26%
2912

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
61%10%13%10%3
1552
16th to endDay
55%10%14%12%5%1
1723
February1st to 15thDay
50%12%18%14%3
1711
16th to endDay
47%11%17%16%5%
1639
March1st to 15thDay
51%9%15%16%6%
2019
16th to endDay
53%9%17%16%3
2363
April1st to 15thDay
49%8%17%17%6%
2329
16th to endDay
37%9%19%21%10%1
2381
May1st to 15thDay
33%7%13%29%16%
2721
16th to endDay
38%7%16%27%9%
2843
June1st to 15thDay
35%6%13%28%13%2
2730
16th to endDay
24%5%13%33%17%5%
2730
July1st to 15thDay
11%310%22%34%18%
2581
16th to endDay
10%25%16%34%29%
2714
August1st to 15thDay
10%48%26%35%15%
2544
16th to endDay
12%37%32%33%9%
2551
September1st to 15thDay
13%28%30%33%11%
2340
16th to endDay
27%6%14%28%17%5%
2171
October1st to 15thDay
36%10%13%21%16%1
1873
16th to endDay
40%9%15%22%12%
1848
November1st to 15thDay
51%11%15%17%4
1647
16th to endDay
56%10%16%13%3
1560
December1st to 15thDay
56%10%12%15%5%
1560
16th to endDay
58%9%16%12%2
1664
January1st to 15thNight
59%10%15%11%3
2716
16th to endNight
52%9%15%14%5%1
2850
February1st to 15thNight
49%11%20%15%3
2483
16th to endNight
43%11%17%21%6%
2121
March1st to 15thNight
45%10%16%19%6%
2269
16th to endNight
43%12%20%18%4
2213
April1st to 15thNight
43%9%19%20%6%
1949
16th to endNight
33%10%18%24%10%2
1852
May1st to 15thNight
27%7%15%33%13%1
1560
16th to endNight
28%10%24%24%10%
1624
June1st to 15thNight
31%9%14%29%13%2
1560
16th to endNight
22%5%13%38%15%5%
1560
July1st to 15thNight
8%311%26%29%19%
1480
16th to endNight
9%26%17%31%33%
1544
August1st to 15thNight
9%38%25%35%17%
1642
16th to endNight
10%29%29%37%10%
2003
September1st to 15thNight
9%210%31%32%14%
1950
16th to endNight
22%5%13%29%21%8%
2118
October1st to 15thNight
32%6%13%27%17%2
2256
16th to endNight
38%9%15%18%16%1
2374
November1st to 15thNight
48%11%14%18%6%
2541
16th to endNight
45%10%19%18%5%
2730
December1st to 15thNight
54%8%15%17%4
2730
16th to endNight
54%9%17%13%5%
2912

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
21%6%23%24%16%7%
90
16th to endDay
17%17%23%27%12%1
155
February1st to 15thDay
13%19%26%27%11%1
281
16th to endDay
13%22%32%21%8%1
274
March1st to 15thDay
15%23%29%23%7%1
330
16th to endDay
14%26%30%21%6%
352
April1st to 15thDay
16%24%27%16%11%4
329
16th to endDay
8%24%32%17%13%3
318
May1st to 15thDay
10%20%26%27%11%2
348
16th to endDay
12%13%21%25%20%6%
394
June1st to 15thDay
6%18%27%26%15%5%
375
16th to endDay
416%29%28%16%3
375
July1st to 15thDay
110%28%30%21%6%
365
16th to endDay
15%31%32%20%7%
391
August1st to 15thDay
7%21%35%19%15%
359
16th to endDay
28%21%29%24%13%
396
September1st to 15thDay
18%22%32%26%8%
375
16th to endDay
5%9%25%33%20%4
375
October1st to 15thDay
10%15%27%29%15%1
345
16th to endDay
12%15%23%29%15%3
264
November1st to 15thDay
8%18%28%36%6%
118
16th to endDay
13%18%27%30%8%1
90
December1st to 15thDay
14%18%28%21%6%10%
90
16th to endDay
10%12%28%34%13%1
96
January1st to 15thNight
15%10%21%30%20%2
780
16th to endNight
13%8%21%33%20%3
832
February1st to 15thNight
12%9%22%36%18%1
764
16th to endNight
12%11%27%32%14%
684
March1st to 15thNight
9%12%26%34%16%1
780
16th to endNight
8%13%26%34%16%1
832
April1st to 15thNight
11%11%29%27%17%2
779
16th to endNight
7%8%29%31%19%4
694
May1st to 15thNight
46%25%36%24%3
390
16th to endNight
5%317%40%29%2
407
June1st to 15thNight
9%6%19%42%20%2
390
16th to endNight
5%425%41%22%
390
July1st to 15thNight
212%47%33%3
370
16th to endNight
113%51%29%3
408
August1st to 15thNight
117%36%45%8%
496
16th to endNight
1113%38%36%8%
761
September1st to 15thNight
1112%38%37%8%
780
16th to endNight
5%214%39%32%5%
776
October1st to 15thNight
9%420%38%22%4
752
16th to endNight
9%6%20%36%21%4
768
November1st to 15thNight
11%8%25%40%12%
760
16th to endNight
11%11%22%30%20%2
780
December1st to 15thNight
13%8%21%35%18%2
780
16th to endNight
14%12%26%34%12%1
832
Page generated at 2018-10-09 07:39:19. Version ac04

Copyright 2018 A. Danko


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