South Cushing
Clear Sky Chart
History

This sumarizes the distribution of each different forecast outcome for the South Cushing clear sky chart from 2005-11-05 to 2017-09-21.

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
31%
14861
16%
46924
8%
14828
40%
14828
19%
31618

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
18%
720
16%
2506
5%
716
33%
716
15%
1633
January16th to endNight
14%
768
15%
2673
3%
768
29%
768
13%
1760
February1st to 15thNight
16%
703
13%
2255
4%
701
28%
701
13%
1603
February16th to endNight
21%
631
18%
1893
5%
631
37%
631
19%
1288
March1st to 15thNight
20%
720
15%
2103
5%
720
33%
720
16%
1513
March16th to endNight
27%
768
20%
2108
8%
768
37%
768
23%
1399
April1st to 15thNight
23%
691
18%
1769
5%
691
31%
691
23%
1273
April16th to endNight
33%
540
15%
1620
6%
540
39%
540
21%
1125
May1st to 15thNight
32%
540
13%
1620
8%
540
38%
540
18%
1170
May16th to endNight
34%
456
11%
1578
10%
455
38%
455
14%
1155
June1st to 15thNight
41%
360
9%
1295
8%
360
46%
360
12%
968
June16th to endNight
49%
360
9%
1306
13%
360
51%
360
18%
899
July1st to 15thNight
53%
340
9%
1360
15%
340
55%
340
19%
864
July16th to endNight
52%
386
11%
1428
14%
364
55%
364
19%
922
August1st to 15thNight
53%
539
12%
1608
8%
535
55%
535
22%
1098
August16th to endNight
58%
606
20%
1752
12%
606
61%
606
30%
1096
September1st to 15thNight
50%
720
17%
1910
10%
720
54%
720
33%
1229
September16th to endNight
50%
681
26%
1880
16%
681
57%
681
36%
1131
October1st to 15thNight
38%
660
20%
1884
11%
660
47%
660
24%
1245
October16th to endNight
26%
704
17%
2249
8%
704
38%
704
21%
1485
November1st to 15thNight
33%
700
19%
2277
12%
700
43%
700
23%
1466
November16th to endNight
25%
733
18%
2415
7%
733
38%
733
16%
1599
December1st to 15thNight
16%
750
15%
2643
3%
750
30%
750
15%
1802
December16th to endNight
15%
785
15%
2792
3%
785
30%
785
14%
1895

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
18%6%2442445%7%38%
47927
Night
19%7%25%424346%37%
47096
TransparencyDay
44%6%12%21%13%1
47618
Night
46%5%12%21%12%1
46924
SeeingDay
22%7%29%26%10%2
6238
Night
23%10%28%25%10%1
14862

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
16%7%3442335%7%40%
1432
16th to endDay
17%8%34324337%40%
1551
February1st to 15thDay
16%9%36%42445%6%35%
1604
16th to endDay
13%9%35%5%245%6%6%35%
1580
March1st to 15thDay
20%8%35%324446%36%
1846
16th to endDay
16%7%24424345%42%
2115
April1st to 15thDay
19%6%24424446%39%
2178
16th to endDay
20%6%245%34346%38%
2340
May1st to 15thDay
25%7%35%5%24346%31%
2332
16th to endDay
23%6%35%42445%7%32%
2545
June1st to 15thDay
26%6%35%434446%30%
2661
16th to endDay
22%5%25%435%45%7%33%
2649
July1st to 15thDay
15%425%425%47%8%38%
2520
16th to endDay
14%5%345%26%6%6%10%36%
2630
August1st to 15thDay
13%5%244345%6%8%39%
2340
16th to endDay
11%42342446%8%47%
2448
September1st to 15thDay
12%5%145%23447%47%
2049
16th to endDay
16%5%13213346%49%
1873
October1st to 15thDay
19%6%245%23346%42%
1746
16th to endDay
19%6%24423446%40%
1621
November1st to 15thDay
19%7%24423346%40%
1581
16th to endDay
21%6%25%322226%43%
1543
December1st to 15thDay
24%6%24323435%38%
1315
16th to endDay
24%10%25%32324434%
1428
January1st to 15thNight
16%8%3432445%8%38%
2506
16th to endNight
17%11%3442435%8%36%
2673
February1st to 15thNight
15%8%36%7%45%35%5%34%
2254
16th to endNight
15%9%46%424246%39%
1893
March1st to 15thNight
20%10%25%5%2435%435%
2090
16th to endNight
18%5%35%424346%42%
2108
April1st to 15thNight
21%8%245%26%445%35%
1769
16th to endNight
22%7%35%433346%35%
1620
May1st to 15thNight
22%10%245%245%45%30%
1620
16th to endNight
24%9%26%5%25%347%26%
1576
June1st to 15thNight
26%7%25%5%45%5%5%6%24%
1295
16th to endNight
21%7%25%424448%32%
1306
July1st to 15thNight
18%5%25%5%26%45%9%33%
1440
16th to endNight
16%7%245%35%47%9%32%
1524
August1st to 15thNight
14%6%26%426%5%48%36%
1620
16th to endNight
13%41443445%8%45%
1752
September1st to 15thNight
14%414324446%48%
1910
16th to endNight
13%5%13323236%53%
1880
October1st to 15thNight
20%6%2432345%6%40%
1884
16th to endNight
20%7%24422346%40%
2249
November1st to 15thNight
19%5%25%31345%6%42%
2277
16th to endNight
18%6%245%3345%5%40%
2415
December1st to 15thNight
23%8%25%323335%37%
2643
16th to endNight
24%8%34423246%36%
2792

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
44%5%15%21%11%1
1433
16th to endDay
46%415%22%11%
1551
February1st to 15thDay
49%5%16%18%9%
1607
16th to endDay
47%6%12%19%12%2
1580
March1st to 15thDay
49%414%18%11%2
1856
16th to endDay
42%5%9%19%18%4
2115
April1st to 15thDay
43%5%9%21%17%2
2178
16th to endDay
46%5%9%20%14%3
2340
May1st to 15thDay
52%5%9%16%13%1
2332
16th to endDay
50%7%12%18%10%1
2549
June1st to 15thDay
54%5%11%18%8%1
2661
16th to endDay
48%7%10%19%12%1
2649
July1st to 15thDay
40%7%14%25%11%
2371
16th to endDay
42%9%14%22%10%1
2465
August1st to 15thDay
38%8%18%24%9%
2327
16th to endDay
32%7%16%26%16%
2448
September1st to 15thDay
35%6%12%25%19%1
2049
16th to endDay
37%49%27%20%1
1873
October1st to 15thDay
41%5%11%24%14%2
1746
16th to endDay
43%5%12%24%12%
1621
November1st to 15thDay
44%5%13%22%13%1
1581
16th to endDay
45%315%17%15%1
1543
December1st to 15thDay
48%5%15%20%10%
1315
16th to endDay
53%411%17%12%
1428
January1st to 15thNight
44%6%16%21%10%
2506
16th to endNight
47%414%20%11%
2673
February1st to 15thNight
51%6%12%19%9%
2255
16th to endNight
47%411%21%12%2
1893
March1st to 15thNight
52%48%19%12%2
2103
16th to endNight
43%410%20%17%4
2108
April1st to 15thNight
49%47%17%17%3
1769
16th to endNight
49%411%18%12%3
1620
May1st to 15thNight
52%6%10%14%14%1
1620
16th to endNight
56%5%9%16%10%
1578
June1st to 15thNight
58%6%11%14%6%1
1295
16th to endNight
49%6%11%20%12%
1306
July1st to 15thNight
45%5%14%22%11%
1360
16th to endNight
46%5%16%21%8%1
1428
August1st to 15thNight
44%8%14%22%9%
1608
16th to endNight
35%7%13%26%17%
1752
September1st to 15thNight
36%6%12%26%16%1
1910
16th to endNight
33%48%31%20%1
1880
October1st to 15thNight
42%5%11%22%15%2
1884
16th to endNight
44%5%12%24%12%
2249
November1st to 15thNight
43%414%22%14%1
2277
16th to endNight
46%5%13%20%12%1
2415
December1st to 15thNight
50%413%21%9%
2643
16th to endNight
51%313%20%10%
2792

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
16%28%30%18%6%
60
16th to endDay
24%15%35%25%
79
February1st to 15thDay
25%16%36%18%3
241
16th to endDay
17%12%41%22%6%
239
March1st to 15thDay
24%15%37%17%3
270
16th to endDay
22%15%32%19%6%2
288
April1st to 15thDay
24%11%35%20%7%1
270
16th to endDay
25%6%37%21%6%1
270
May1st to 15thDay
34%7%29%19%7%2
288
16th to endDay
25%6%33%25%8%1
331
June1st to 15thDay
28%324%29%12%1
456
16th to endDay
25%126%31%12%2
444
July1st to 15thDay
20%122%38%14%3
305
16th to endDay
18%121%36%17%4
326
August1st to 15thDay
13%227%34%18%3
313
16th to endDay
14%320%35%19%7%
332
September1st to 15thDay
15%327%30%18%5%
315
16th to endDay
20%225%28%14%8%
275
October1st to 15thDay
22%8%25%23%15%4
242
16th to endDay
24%10%31%26%6%
240
November1st to 15thDay
22%11%26%23%11%3
235
16th to endDay
27%16%30%17%7%1
240
December1st to 15thDay
29%10%39%16%4
115
16th to endDay
37%20%31%9%1
64
January1st to 15thNight
21%20%36%17%3
720
16th to endNight
25%21%33%16%3
768
February1st to 15thNight
20%20%37%18%3
704
16th to endNight
20%14%38%20%5%
631
March1st to 15thNight
27%13%33%21%3
720
16th to endNight
19%12%33%23%9%
768
April1st to 15thNight
26%8%37%21%6%
691
16th to endNight
26%5%26%28%11%1
540
May1st to 15thNight
27%227%27%11%2
540
16th to endNight
30%222%30%11%1
456
June1st to 15thNight
30%315%33%16%1
360
16th to endNight
25%115%40%15%
360
July1st to 15thNight
21%213%37%22%2
340
16th to endNight
20%116%36%24%
386
August1st to 15thNight
17%16%40%23%1
539
16th to endNight
16%116%36%25%3
606
September1st to 15thNight
17%222%32%22%2
720
16th to endNight
18%322%29%20%5%
681
October1st to 15thNight
24%6%24%29%12%2
660
16th to endNight
23%11%34%22%6%
704
November1st to 15thNight
21%9%31%26%9%1
700
16th to endNight
22%17%30%19%9%
733
December1st to 15thNight
28%15%35%16%4
750
16th to endNight
29%16%35%15%2
785
Page generated at 2017-09-22 07:35:39. Version ac04

Copyright 2017 A. Danko


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