Conkles Hollow
Clear Sky Chart
History

This sumarizes the distribution of each different forecast outcome for the Conkles Hollow 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
38%
15404
17%
46552
11%
15363
44%
15363
21%
31763

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%
720
11%
2327
5%
716
21%
716
9%
1870
January16th to endNight
17%
768
12%
2496
7%
768
25%
768
11%
1896
February1st to 15thNight
20%
701
12%
2247
6%
701
27%
701
13%
1659
February16th to endNight
17%
631
12%
1893
5%
631
24%
631
12%
1447
March1st to 15thNight
24%
720
16%
2034
9%
720
30%
720
16%
1465
March16th to endNight
26%
768
16%
2112
8%
768
33%
768
20%
1499
April1st to 15thNight
25%
662
15%
1881
6%
662
34%
662
22%
1300
April16th to endNight
33%
540
21%
1620
10%
540
42%
540
24%
1060
May1st to 15thNight
36%
540
14%
1620
7%
540
42%
540
19%
1129
May16th to endNight
54%
562
16%
1684
12%
561
57%
561
28%
1073
June1st to 15thNight
58%
540
17%
1620
12%
540
64%
540
33%
960
June16th to endNight
57%
540
16%
1620
12%
540
61%
540
32%
983
July1st to 15thNight
56%
510
14%
1530
12%
510
59%
510
29%
971
July16th to endNight
67%
564
17%
1595
13%
531
71%
531
34%
952
August1st to 15thNight
68%
527
23%
1575
18%
524
71%
524
33%
942
August16th to endNight
69%
525
24%
1589
21%
525
71%
525
37%
911
September1st to 15thNight
64%
657
27%
1812
20%
657
68%
657
38%
1073
September16th to endNight
54%
657
26%
1815
20%
657
58%
657
31%
1151
October1st to 15thNight
49%
660
25%
1908
22%
660
54%
660
32%
1181
October16th to endNight
34%
704
22%
2122
16%
704
43%
704
22%
1425
November1st to 15thNight
41%
700
25%
2276
20%
700
50%
700
27%
1359
November16th to endNight
29%
720
16%
2340
12%
720
36%
720
16%
1642
December1st to 15thNight
22%
720
10%
2340
7%
720
27%
720
10%
1826
December16th to endNight
17%
768
10%
2496
5%
768
23%
768
9%
1989

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
16%8%36%5%3445%7%33%
47408
Night
15%8%36%5%2445%7%37%
46745
Cloud CoverDay
16%8%36%5%3445%7%33%
47418
Night
14%8%36%5%2445%7%37%
46749
TransparencyDay
49%6%11%19%11%1
47119
Night
46%5%11%20%13%2
46552
SeeingDay
20%10%24%21%14%8%
5237
Night
19%11%25%26%14%1
15408

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
21%13%5%10%6%4433420%
1611
16th to endDay
17%15%7%9%6%34445%21%
1728
February1st to 15thDay
19%13%6%8%5%24345%26%
1612
16th to endDay
17%15%6%7%5%22335%29%
1580
March1st to 15thDay
20%13%46%424345%29%
1915
16th to endDay
21%10%36%5%24345%31%
2112
April1st to 15thDay
19%9%35%423346%36%
2075
16th to endDay
17%7%35%5%24346%38%
2340
May1st to 15thDay
21%8%35%5%345%47%29%
2331
16th to endDay
10%5%36%6%36%5%5%9%36%
2431
June1st to 15thDay
11%5%25%5%45%5%7%8%38%
2340
16th to endDay
12%425%6%46%6%6%9%33%
2340
July1st to 15thDay
15%6%26%6%46%5%7%7%32%
2340
16th to endDay
10%435%6%36%6%8%9%34%
2465
August1st to 15thDay
8%5%26%7%47%6%7%11%33%
2288
16th to endDay
9%425%6%45%6%6%9%40%
2249
September1st to 15thDay
14%5%1333445%7%44%
1815
16th to endDay
18%6%25%423435%43%
1815
October1st to 15thDay
14%6%35%42345%7%41%
1722
16th to endDay
21%7%24324335%40%
1749
November1st to 15thDay
12%8%25%42325%7%45%
1582
16th to endDay
18%10%46%5%24346%31%
1620
December1st to 15thDay
24%15%6%8%5%24335%20%
1620
16th to endDay
21%18%6%8%5%23345%20%
1728
January1st to 15thNight
20%14%7%11%7%2443421%
2327
16th to endNight
16%15%5%9%6%3434426%
2496
February1st to 15thNight
19%12%47%6%24435%30%
2245
16th to endNight
17%14%5%8%5%25%445%26%
1893
March1st to 15thNight
17%9%46%42445%8%31%
2022
16th to endNight
19%8%36%334446%35%
2112
April1st to 15thNight
15%8%35%5%2446%6%37%
1881
16th to endNight
13%6%26%6%3445%8%38%
1620
May1st to 15thNight
17%6%36%43446%7%34%
1620
16th to endNight
8%5%245%36%5%6%9%42%
1682
June1st to 15thNight
6%4134246%7%9%48%
1620
16th to endNight
8%4244245%7%10%45%
1620
July1st to 15thNight
9%6%26%33445%9%44%
1620
16th to endNight
6%424426%47%9%46%
1703
August1st to 15thNight
5%315%5%35%5%7%10%46%
1586
16th to endNight
6%32443445%8%52%
1589
September1st to 15thNight
11%41332345%5%53%
1812
16th to endNight
14%425%422445%47%
1815
October1st to 15thNight
12%5%2432335%8%47%
1908
16th to endNight
20%6%24423445%39%
2122
November1st to 15thNight
15%6%24423345%47%
2276
16th to endNight
20%10%35%5%24346%32%
2340
December1st to 15thNight
22%13%5%7%5%24345%24%
2340
16th to endNight
21%15%7%7%6%34346%20%
2496

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
21%13%6%10%6%35%33420%
1611
16th to endDay
17%15%7%9%6%34445%21%
1728
February1st to 15thDay
19%13%5%9%5%24336%26%
1612
16th to endDay
17%15%5%8%5%2333430%
1580
March1st to 15thDay
21%12%46%424345%29%
1926
16th to endDay
21%10%37%5%24345%31%
2111
April1st to 15thDay
19%9%45%5%24345%36%
2075
16th to endDay
16%6%35%5%24447%37%
2340
May1st to 15thDay
20%8%35%5%3445%7%29%
2331
16th to endDay
10%5%27%6%35%6%6%9%35%
2431
June1st to 15thDay
11%435%5%45%5%7%7%38%
2340
16th to endDay
12%5%25%6%46%6%6%9%33%
2340
July1st to 15thDay
15%6%27%5%36%5%6%7%32%
2340
16th to endDay
10%5%25%6%46%7%8%9%34%
2465
August1st to 15thDay
7%5%26%6%5%6%7%7%11%32%
2288
16th to endDay
9%415%6%45%6%6%9%40%
2249
September1st to 15thDay
14%5%233245%5%7%44%
1815
16th to endDay
18%6%25%413435%43%
1815
October1st to 15thDay
13%7%35%42345%7%41%
1722
16th to endDay
21%7%24423345%40%
1749
November1st to 15thDay
12%8%2442235%6%46%
1582
16th to endDay
18%10%46%5%24346%31%
1620
December1st to 15thDay
23%15%7%8%5%3433420%
1620
16th to endDay
21%18%6%8%5%23245%21%
1728
January1st to 15thNight
20%13%7%10%6%3433421%
2327
16th to endNight
16%15%5%9%6%3433426%
2496
February1st to 15thNight
18%12%47%5%33435%30%
2238
16th to endNight
17%14%6%8%5%25%34427%
1893
March1st to 15thNight
17%9%5%6%43445%7%31%
2034
16th to endNight
19%8%36%424447%35%
2112
April1st to 15thNight
15%8%35%5%2446%6%37%
1881
16th to endNight
13%6%26%6%2446%8%38%
1620
May1st to 15thNight
17%5%35%5%25%5%6%8%34%
1619
16th to endNight
8%5%245%36%46%9%42%
1682
June1st to 15thNight
6%3144247%7%8%48%
1620
16th to endNight
8%4244235%7%11%44%
1620
July1st to 15thNight
9%6%26%5%2446%9%44%
1620
16th to endNight
6%414435%47%9%47%
1703
August1st to 15thNight
4325%6%35%6%7%10%45%
1586
16th to endNight
6%325%33345%9%51%
1589
September1st to 15thNight
11%41333345%6%53%
1812
16th to endNight
14%5%25%423445%48%
1815
October1st to 15thNight
11%5%3442336%7%47%
1908
16th to endNight
19%6%235%3445%5%39%
2122
November1st to 15thNight
15%6%14423346%47%
2276
16th to endNight
20%10%36%423446%32%
2340
December1st to 15thNight
22%13%5%7%5%34335%24%
2340
16th to endNight
21%15%6%8%6%34346%20%
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
67%39%13%5%
1612
16th to endDay
64%6%11%13%4
1728
February1st to 15thDay
60%413%13%7%
1614
16th to endDay
59%411%18%6%
1580
March1st to 15thDay
57%411%19%5%
1926
16th to endDay
54%5%10%21%7%
2112
April1st to 15thDay
49%49%21%11%2
2075
16th to endDay
46%5%10%19%13%4
2340
May1st to 15thDay
53%6%11%17%8%2
2331
16th to endDay
41%11%11%20%13%1
2435
June1st to 15thDay
40%8%12%21%15%1
2340
16th to endDay
44%9%12%17%14%2
2340
July1st to 15thDay
48%7%10%17%14%1
2201
16th to endDay
39%10%15%20%12%1
2310
August1st to 15thDay
40%9%13%21%13%1
2275
16th to endDay
37%7%13%23%13%4
2249
September1st to 15thDay
36%6%11%19%21%3
1815
16th to endDay
43%5%6%20%22%
1815
October1st to 15thDay
41%5%11%22%17%1
1722
16th to endDay
46%310%26%11%1
1749
November1st to 15thDay
39%48%24%17%5%
1582
16th to endDay
54%49%20%10%
1620
December1st to 15thDay
67%49%13%5%
1620
16th to endDay
65%411%13%4
1728
January1st to 15thNight
67%48%12%6%
2327
16th to endNight
61%311%16%5%1
2496
February1st to 15thNight
57%411%18%7%
2247
16th to endNight
61%39%17%7%
1893
March1st to 15thNight
51%5%11%21%8%1
2034
16th to endNight
49%5%13%21%10%
2112
April1st to 15thNight
45%6%11%19%15%2
1881
16th to endNight
42%5%10%19%16%5%
1620
May1st to 15thNight
46%8%12%20%9%2
1620
16th to endNight
36%8%15%21%14%3
1684
June1st to 15thNight
28%10%15%23%20%1
1620
16th to endNight
32%8%15%22%19%2
1620
July1st to 15thNight
38%6%13%18%20%3
1530
16th to endNight
30%9%16%25%17%1
1595
August1st to 15thNight
30%8%13%26%18%2
1575
16th to endNight
29%6%12%25%20%5%
1589
September1st to 15thNight
30%5%12%21%25%4
1812
16th to endNight
38%47%20%28%
1815
October1st to 15thNight
34%6%11%25%18%3
1908
16th to endNight
45%49%25%12%1
2122
November1st to 15thNight
37%310%23%19%5%
2276
16th to endNight
53%410%19%12%1
2340
December1st to 15thNight
62%5%9%15%6%
2340
16th to endNight
65%5%11%13%4
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
34%23%31%5%41
90
16th to endDay
35%32%25%7%
96
February1st to 15thDay
36%31%25%5%1
90
16th to endDay
24%20%46%6%1
81
March1st to 15thDay
34%15%28%15%6%
216
16th to endDay
26%18%30%14%8%
288
April1st to 15thDay
28%11%28%21%7%1
270
16th to endDay
21%12%30%17%12%5%
270
May1st to 15thDay
27%14%26%16%9%4
288
16th to endDay
16%7%30%22%14%8%
331
June1st to 15thDay
11%7%21%36%16%6%
315
16th to endDay
14%10%26%28%12%8%
315
July1st to 15thDay
19%5%24%23%15%11%
305
16th to endDay
11%216%26%20%22%
326
August1st to 15thDay
12%217%24%25%17%
297
16th to endDay
10%211%29%27%18%
268
September1st to 15thDay
13%313%19%33%16%
255
16th to endDay
22%5%13%22%24%11%
254
October1st to 15thDay
13%6%26%27%18%7%
255
16th to endDay
22%13%29%21%11%1
261
November1st to 15thDay
13%13%21%33%15%3
90
16th to endDay
31%17%32%13%5%
90
December1st to 15thDay
31%25%23%14%14
90
16th to endDay
36%29%29%41
96
January1st to 15thNight
30%21%29%16%2
720
16th to endNight
26%21%30%19%1
768
February1st to 15thNight
26%17%30%24%
704
16th to endNight
25%18%33%19%1
631
March1st to 15thNight
22%17%31%23%5%
720
16th to endNight
22%15%31%19%10%
768
April1st to 15thNight
19%15%35%21%7%
662
16th to endNight
16%10%35%25%10%1
540
May1st to 15thNight
18%11%28%26%12%1
540
16th to endNight
10%5%24%30%26%2
563
June1st to 15thNight
7%225%40%22%1
540
16th to endNight
10%222%38%25%1
540
July1st to 15thNight
11%120%36%25%3
510
16th to endNight
7%115%32%37%5%
564
August1st to 15thNight
6%114%37%35%4
527
16th to endNight
7%115%32%35%7%
525
September1st to 15thNight
13%313%33%31%5%
657
16th to endNight
16%5%17%30%25%3
657
October1st to 15thNight
15%6%24%29%19%3
660
16th to endNight
23%11%25%27%10%
704
November1st to 15thNight
18%12%22%27%17%1
700
16th to endNight
24%15%26%24%8%
720
December1st to 15thNight
30%15%25%20%6%
720
16th to endNight
29%17%29%21%2
768
Page generated at 2017-08-13 14:16:33. Version ac04

Copyright 2017 A. Danko


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