Goochtown
Clear Sky Chart
History

This sumarizes the distribution of each different forecast outcome for the Goochtown clear sky chart from 2005-11-05 to 2017-09-24.

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
44%
15433
20%
47012
14%
15389
50%
15389
24%
30689

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
21%
720
15%
2327
9%
716
30%
716
15%
1664
January16th to endNight
21%
768
18%
2496
9%
768
32%
768
17%
1724
February1st to 15thNight
19%
704
15%
2123
5%
701
29%
701
18%
1515
February16th to endNight
17%
631
16%
1893
6%
631
26%
631
16%
1378
March1st to 15thNight
25%
720
17%
2089
9%
720
32%
720
19%
1475
March16th to endNight
32%
768
15%
2112
8%
768
37%
768
21%
1511
April1st to 15thNight
36%
581
22%
1839
14%
581
47%
581
27%
1148
April16th to endNight
40%
540
22%
1673
13%
540
48%
540
26%
1086
May1st to 15thNight
42%
539
15%
1619
10%
539
47%
539
20%
1145
May16th to endNight
59%
562
18%
1684
14%
561
62%
561
27%
1073
June1st to 15thNight
68%
540
17%
1620
15%
540
70%
540
34%
967
June16th to endNight
70%
540
17%
1620
15%
540
72%
540
33%
968
July1st to 15thNight
64%
510
13%
1530
12%
510
65%
510
28%
987
July16th to endNight
73%
564
19%
1595
17%
531
76%
531
34%
947
August1st to 15thNight
73%
539
21%
1609
20%
536
74%
536
33%
977
August16th to endNight
76%
573
22%
1883
24%
573
76%
573
32%
1083
September1st to 15thNight
64%
669
22%
1929
20%
669
66%
669
31%
1205
September16th to endNight
61%
693
28%
1914
22%
693
63%
693
33%
1192
October1st to 15thNight
58%
660
33%
1834
28%
660
62%
660
37%
1077
October16th to endNight
43%
704
26%
2171
20%
704
52%
704
29%
1321
November1st to 15thNight
46%
700
29%
2276
24%
700
56%
700
32%
1294
November16th to endNight
35%
720
23%
2340
17%
720
45%
720
24%
1490
December1st to 15thNight
30%
720
15%
2340
11%
720
35%
720
16%
1661
December16th to endNight
25%
768
17%
2496
10%
768
35%
768
15%
1801

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
14%7%36%5%35%45%7%36%
47914
Night
14%6%35%5%2445%7%40%
47210
TransparencyDay
45%6%11%20%14%2
47615
Night
42%5%11%21%16%3
47013
SeeingDay
17%6%20%22%20%12%
5304
Night
17%7%24%28%19%3
15435

By Month

Percentage Cloud Cover SE (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
20%11%5%8%5%24446%27%
1611
16th to endDay
18%10%47%434335%35%
1728
February1st to 15thDay
16%11%5%8%433445%31%
1738
16th to endDay
15%10%49%6%34445%30%
1580
March1st to 15thDay
24%8%25%5%24345%34%
1869
16th to endDay
18%8%36%5%245%46%32%
2111
April1st to 15thDay
12%6%35%5%2445%7%40%
2118
16th to endDay
15%6%35%5%3445%6%38%
2286
May1st to 15thDay
19%7%25%6%35%45%7%32%
2331
16th to endDay
10%7%35%5%36%46%8%37%
2431
June1st to 15thDay
8%426%7%36%5%6%8%38%
2340
16th to endDay
8%4246%46%5%7%10%39%
2340
July1st to 15thDay
13%5%25%6%36%7%6%9%32%
2340
16th to endDay
11%426%6%47%6%7%10%31%
2465
August1st to 15thDay
9%5%25%6%46%6%7%11%33%
2340
16th to endDay
9%6%25%5%46%7%7%9%35%
2317
September1st to 15thDay
15%6%35%6%35%5%5%6%35%
2019
16th to endDay
15%425%43445%7%44%
1905
October1st to 15thDay
11%414323446%52%
1795
16th to endDay
19%5%24322236%47%
1700
November1st to 15thDay
14%5%15%334246%48%
1582
16th to endDay
17%8%24424435%43%
1620
December1st to 15thDay
22%9%26%5%33345%33%
1620
16th to endDay
19%11%37%424436%31%
1728
January1st to 15thNight
19%9%5%7%7%33346%30%
2327
16th to endNight
17%10%46%424445%34%
2496
February1st to 15thNight
18%9%47%5%24435%33%
2114
16th to endNight
18%12%47%5%34335%31%
1893
March1st to 15thNight
15%9%36%6%3445%5%35%
2089
16th to endNight
16%9%37%5%35%35%6%34%
2112
April1st to 15thNight
13%5%35%424446%45%
1839
16th to endNight
14%5%35%5%24447%41%
1673
May1st to 15thNight
16%6%26%6%45%446%35%
1619
16th to endNight
7%4147%35%6%5%8%42%
1682
June1st to 15thNight
5%3145%25%6%7%11%44%
1620
16th to endNight
5%4244345%7%12%44%
1620
July1st to 15thNight
10%435%435%5%7%8%41%
1620
16th to endNight
6%3235%347%8%10%43%
1703
August1st to 15thNight
5%325%5%35%5%6%10%46%
1620
16th to endNight
6%3244346%7%9%47%
1883
September1st to 15thNight
12%4244245%6%8%44%
1929
16th to endNight
10%6%25%424345%50%
1914
October1st to 15thNight
11%5%14322446%52%
1834
16th to endNight
16%425%323345%47%
2171
November1st to 15thNight
12%6%23413336%52%
2276
16th to endNight
18%6%34323336%42%
2340
December1st to 15thNight
21%10%36%423445%32%
2340
16th to endNight
21%10%46%434335%31%
2496

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
57%38%16%11%1
1612
16th to endDay
52%310%24%8%1
1728
February1st to 15thDay
55%47%21%9%2
1740
16th to endDay
54%411%17%9%1
1580
March1st to 15thDay
52%49%18%13%1
1869
16th to endDay
50%6%12%21%8%
2112
April1st to 15thDay
41%5%9%23%15%3
2118
16th to endDay
45%6%9%22%13%3
2286
May1st to 15thDay
50%6%11%20%10%
2331
16th to endDay
42%8%14%22%10%2
2435
June1st to 15thDay
39%9%13%22%13%1
2340
16th to endDay
38%8%13%18%18%2
2340
July1st to 15thDay
44%8%15%15%13%2
2201
16th to endDay
42%10%13%18%12%2
2310
August1st to 15thDay
42%9%14%19%12%1
2327
16th to endDay
39%8%13%19%14%2
2317
September1st to 15thDay
45%7%11%16%14%4
2019
16th to endDay
38%5%9%20%22%2
1905
October1st to 15thDay
33%47%25%24%5%
1795
16th to endDay
39%37%25%21%2
1700
November1st to 15thDay
38%27%23%21%6%
1582
16th to endDay
43%46%25%17%3
1620
December1st to 15thDay
53%48%19%10%2
1620
16th to endDay
53%412%20%8%
1728
January1st to 15thNight
55%39%15%13%2
2327
16th to endNight
51%49%21%11%1
2496
February1st to 15thNight
53%310%20%10%1
2123
16th to endNight
55%310%18%10%1
1893
March1st to 15thNight
50%48%18%13%3
2089
16th to endNight
49%5%10%22%10%1
2112
April1st to 15thNight
38%5%10%21%20%4
1839
16th to endNight
41%5%9%24%14%4
1673
May1st to 15thNight
48%7%10%21%10%2
1620
16th to endNight
36%9%14%23%13%2
1684
June1st to 15thNight
31%7%17%24%16%2
1620
16th to endNight
30%8%16%23%15%4
1620
July1st to 15thNight
37%8%15%20%15%3
1530
16th to endNight
29%9%19%22%15%3
1595
August1st to 15thNight
31%9%15%21%19%3
1609
16th to endNight
30%8%14%25%18%3
1883
September1st to 15thNight
35%7%14%20%15%6%
1929
16th to endNight
36%5%7%20%27%3
1914
October1st to 15thNight
31%49%23%25%6%
1834
16th to endNight
38%37%23%22%4
2171
November1st to 15thNight
34%25%22%26%6%
2276
16th to endNight
43%37%23%19%2
2340
December1st to 15thNight
54%39%18%10%3
2340
16th to endNight
56%310%18%10%1
2496

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
31%17%37%5%5%2
90
16th to endDay
31%18%39%9%1
96
February1st to 15thDay
21%23%41%12%2
90
16th to endDay
25%19%33%17%3
81
March1st to 15thDay
29%22%29%15%2
159
16th to endDay
19%11%33%26%7%1
288
April1st to 15thDay
16%14%22%26%16%2
270
16th to endDay
18%8%26%24%15%6%
270
May1st to 15thDay
24%9%24%20%14%7%
288
16th to endDay
15%6%18%29%16%13%
331
June1st to 15thDay
10%211%26%31%17%
315
16th to endDay
10%419%25%25%15%
315
July1st to 15thDay
16%117%26%21%17%
305
16th to endDay
14%8%18%30%27%
326
August1st to 15thDay
11%12%20%29%25%
313
16th to endDay
11%28%27%28%21%
332
September1st to 15thDay
17%210%18%30%19%
315
16th to endDay
15%110%25%32%14%
287
October1st to 15thDay
14%220%29%20%11%
255
16th to endDay
20%5%25%26%17%4
212
November1st to 15thDay
17%7%24%28%16%4
90
16th to endDay
24%14%34%20%6%
90
December1st to 15thDay
28%11%36%12%8%2
90
16th to endDay
30%14%46%5%3
96
January1st to 15thNight
24%16%33%20%5%
720
16th to endNight
22%14%36%23%2
768
February1st to 15thNight
22%14%38%23%1
704
16th to endNight
24%13%40%18%2
631
March1st to 15thNight
22%12%34%25%5%
720
16th to endNight
20%10%30%27%9%
768
April1st to 15thNight
16%10%34%27%11%
581
16th to endNight
17%6%31%28%14%1
540
May1st to 15thNight
16%5%27%33%15%2
540
16th to endNight
8%218%34%28%6%
563
June1st to 15thNight
7%112%41%30%6%
540
16th to endNight
7%112%40%35%3
540
July1st to 15thNight
11%11%33%37%4
510
16th to endNight
8%7%29%44%9%
564
August1st to 15thNight
7%7%31%45%7%
539
16th to endNight
7%6%36%40%7%
573
September1st to 15thNight
13%111%27%39%7%
669
16th to endNight
13%214%28%35%5%
693
October1st to 15thNight
14%5%17%28%27%6%
660
16th to endNight
18%5%27%27%17%2
704
November1st to 15thNight
16%6%26%29%18%2
700
16th to endNight
21%10%29%27%9%
720
December1st to 15thNight
26%12%26%25%8%
720
16th to endNight
28%11%30%25%4
768
Page generated at 2017-09-25 09:02:19. Version ac04

Copyright 2017 A. Danko


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