Hanceville
Clear Sky Chart
History

This sumarizes the distribution of each different forecast outcome for the Hanceville clear sky chart from 2005-11-06 to 2024-01-14.

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
47%
23471
23%
74474
16%
23416
55%
23416
27%
45948

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 10thNight
23%
760
22%
2459
9%
757
39%
757
20%
1558
January11th to 20thNight
26%
736
23%
2336
11%
736
39%
736
17%
1603
January21st to endNight
23%
792
28%
2376
11%
792
39%
792
23%
1514
February1st to 10thNight
26%
720
24%
2160
10%
720
39%
720
24%
1403
February11th to 20thNight
25%
703
19%
2098
9%
699
35%
699
21%
1393
February21st to endNight
22%
592
21%
1776
8%
592
33%
592
20%
1224
March1st to 10thNight
30%
720
23%
2160
12%
720
39%
720
24%
1361
March11th to 20thNight
30%
720
18%
2064
9%
720
38%
720
23%
1372
March21st to endNight
33%
698
23%
2084
12%
698
43%
698
25%
1328
April1st to 10thNight
38%
540
26%
1800
17%
540
50%
540
28%
1054
April11th to 20thNight
39%
533
27%
1775
17%
533
52%
533
28%
1024
April21st to endNight
46%
540
26%
1800
19%
540
57%
540
31%
1013
May1st to 10thNight
51%
540
24%
1639
15%
540
59%
540
35%
954
May11th to 20thNight
54%
531
19%
1592
13%
531
59%
531
29%
999
May21st to endNight
69%
582
21%
1744
19%
582
71%
582
33%
1053
June1st to 10thNight
67%
540
18%
1620
16%
540
69%
540
29%
1035
June11th to 20thNight
77%
540
20%
1620
16%
540
80%
540
41%
897
June21st to endNight
71%
540
18%
1620
16%
540
73%
540
33%
973
July1st to 10thNight
70%
525
13%
1575
12%
525
71%
525
27%
1037
July11th to 20thNight
77%
522
15%
1566
15%
522
78%
522
32%
965
July21st to endNight
69%
591
16%
1695
16%
558
70%
558
26%
1123
August1st to 10thNight
81%
537
16%
1778
18%
534
81%
534
32%
1025
August11th to 20thNight
71%
534
15%
1776
18%
534
71%
534
26%
1111
August21st to endNight
68%
594
20%
1980
24%
594
68%
594
25%
1268
September1st to 10thNight
67%
562
22%
1822
23%
562
68%
562
29%
1116
September11th to 20thNight
62%
720
22%
1980
19%
720
64%
720
30%
1290
September21st to endNight
67%
720
30%
1980
22%
720
71%
720
41%
1134
October1st to 10thNight
56%
720
32%
1980
24%
720
62%
720
42%
1126
October11th to 20thNight
51%
720
33%
1980
23%
720
59%
720
36%
1187
October21st to endNight
48%
792
30%
2508
26%
792
55%
792
31%
1452
November1st to 10thNight
51%
740
28%
2406
24%
740
61%
740
33%
1332
November11th to 20thNight
40%
760
29%
2470
18%
760
55%
760
32%
1390
November21st to endNight
39%
760
26%
2470
17%
760
51%
760
26%
1498
December1st to 10thNight
32%
760
23%
2470
15%
760
44%
760
20%
1616
December11th to 20thNight
31%
759
24%
2910
15%
758
40%
758
20%
1743
December21st to endNight
26%
828
14%
4405
12%
817
37%
817
11%
2777

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
13%6%35%5%35%5%6%7%41%
74826
Night
13%6%25%5%3445%7%45%
74944
TransparencyDay
40%7%11%20%18%4
74551
Night
37%6%11%20%20%6%
74738
SeeingDay
17%10%23%23%19%9%
13414
Night
16%8%22%29%21%4
23482

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 10thDay
20%8%35%422346%42%
1706
11th to 20thDay
22%9%25%434335%41%
1700
21st to endDay
18%7%24324335%47%
1980
February1st to 10thDay
19%11%35%423446%39%
1800
11th to 20thDay
24%7%35%5%34445%38%
1748
21st to endDay
23%10%25%42444438%
1480
March1st to 10thDay
16%7%35%5%25%446%43%
1800
11th to 20thDay
19%7%46%445%45%6%36%
1894
21st to endDay
14%6%36%7%35%5%5%7%39%
2286
April1st to 10thDay
12%5%35%43345%7%47%
2160
11th to 20thDay
14%6%25%5%3445%6%46%
2134
21st to endDay
10%435%4346%6%7%47%
2160
May1st to 10thDay
13%5%25%5%35%447%47%
2317
11th to 20thDay
10%6%36%5%45%6%6%8%41%
2301
21st to endDay
10%426%6%36%6%7%9%41%
2531
June1st to 10thDay
10%6%36%7%47%7%7%9%35%
2340
11th to 20thDay
5%325%5%47%6%9%10%43%
2340
21st to endDay
8%425%6%47%6%8%10%40%
2340
July1st to 10thDay
9%5%37%7%5%7%8%8%11%30%
2340
11th to 20thDay
8%5%36%7%47%8%8%12%32%
2340
21st to endDay
7%5%36%6%5%8%9%10%12%31%
2519
August1st to 10thDay
6%5%26%6%5%8%8%8%11%35%
2148
11th to 20thDay
10%5%38%7%47%6%8%10%32%
2125
21st to endDay
12%7%36%7%5%6%6%6%9%35%
2376
September1st to 10thDay
10%5%25%6%36%7%6%9%40%
2120
11th to 20thDay
12%6%26%5%36%5%7%7%42%
1980
21st to endDay
11%4245%2446%6%52%
1980
October1st to 10thDay
9%43442335%6%55%
1980
11th to 20thDay
11%6%234235%46%53%
1980
21st to endDay
14%4245%23445%53%
1842
November1st to 10thDay
13%5%23423345%55%
1672
11th to 20thDay
13%6%24424346%51%
1710
21st to endDay
15%7%25%5%335%5%6%44%
1710
December1st to 10thDay
23%7%35%424445%37%
1710
11th to 20thDay
18%7%35%5%35%435%42%
2153
21st to endDay
19%10%46%6%3435%6%34%
3124
January1st to 10thNight
19%7%35%42443444%
2459
11th to 20thNight
20%9%45%5%34445%37%
2336
21st to endNight
17%7%45%424445%44%
2376
February1st to 10thNight
19%8%35%423446%43%
2160
11th to 20thNight
22%7%25%424335%42%
2098
21st to endNight
22%6%25%425%45%6%38%
1776
March1st to 10thNight
17%6%25%5%34346%46%
2160
11th to 20thNight
16%7%26%5%345%5%7%41%
2064
21st to endNight
15%6%25%5%345%6%6%44%
2084
April1st to 10thNight
12%4245%36%45%8%47%
1800
11th to 20thNight
15%5%2432435%6%50%
1775
21st to endNight
10%5%25%4345%5%7%51%
1800
May1st to 10thNight
8%4245%25%5%5%8%52%
1639
11th to 20thNight
9%6%35%5%35%5%6%10%44%
1592
21st to endNight
7%3246%36%6%7%9%46%
1744
June1st to 10thNight
6%5%35%5%46%7%7%11%41%
1620
11th to 20thNight
5%223435%5%7%10%55%
1620
21st to endNight
6%4246%35%5%7%11%46%
1620
July1st to 10thNight
8%5%35%6%47%7%7%10%37%
1620
11th to 20thNight
6%4245%45%6%8%12%44%
1620
21st to endNight
6%5%36%6%46%6%9%11%38%
1795
August1st to 10thNight
43246%36%6%9%14%43%
1790
11th to 20thNight
8%426%6%35%6%7%10%43%
1776
21st to endNight
10%7%35%5%45%5%7%9%41%
1980
September1st to 10thNight
8%425%6%46%6%5%7%48%
1822
11th to 20thNight
10%6%25%6%35%6%6%7%45%
1980
21st to endNight
7%5%2443446%7%56%
1980
October1st to 10thNight
9%5%14423336%60%
1980
11th to 20thNight
11%6%2443335%5%53%
1980
21st to endNight
16%6%24422335%54%
2508
November1st to 10thNight
11%32442435%5%56%
2406
11th to 20thNight
13%6%24323445%54%
2470
21st to endNight
16%6%24424446%47%
2470
December1st to 10thNight
19%7%346%3445%6%40%
2470
11th to 20thNight
18%6%35%423445%46%
3042
21st to endNight
19%9%46%5%3446%7%32%
4532

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 10thDay
45%47%18%22%5%
1707
11th to 20thDay
48%46%20%18%4
1700
21st to endDay
41%45%22%23%5%
1980
February1st to 10thDay
47%48%17%20%4
1800
11th to 20thDay
49%5%6%18%17%5%
1758
21st to endDay
50%47%12%21%6%
1480
March1st to 10thDay
43%48%15%20%10%
1800
11th to 20thDay
49%6%9%15%17%5%
1894
21st to endDay
43%6%10%22%16%2
2286
April1st to 10thDay
36%5%11%22%18%7%
2160
11th to 20thDay
39%5%7%21%23%6%
2134
21st to endDay
34%6%11%25%22%3
2160
May1st to 10thDay
36%7%11%23%19%4
2317
11th to 20thDay
39%9%13%23%15%2
2305
21st to endDay
37%8%14%24%15%2
2531
June1st to 10thDay
42%11%13%18%15%1
2340
11th to 20thDay
31%11%16%25%14%2
2340
21st to endDay
36%10%18%21%12%4
2340
July1st to 10thDay
41%13%18%19%8%2
2275
11th to 20thDay
40%14%21%16%8%2
2271
21st to endDay
38%16%19%19%8%1
2378
August1st to 10thDay
38%13%20%22%7%1
2136
11th to 20thDay
43%12%15%18%10%2
2125
21st to endDay
45%9%14%19%10%4
2376
September1st to 10thDay
38%10%15%17%16%5%
2120
11th to 20thDay
38%9%12%17%20%4
1980
21st to endDay
32%6%11%22%22%7%
1980
October1st to 10thDay
30%5%9%21%26%8%
1980
11th to 20thDay
30%5%9%22%25%9%
1980
21st to endDay
34%45%18%30%10%
1842
November1st to 10thDay
33%38%18%29%10%
1672
11th to 20thDay
35%46%20%25%10%
1710
21st to endDay
39%6%7%16%24%7%
1710
December1st to 10thDay
48%6%7%15%19%5%
1710
11th to 20thDay
46%36%19%21%5%
2150
21st to endDay
50%49%19%16%2
3124
January1st to 10thNight
44%47%20%21%5%
2459
11th to 20thNight
50%46%18%18%4
2336
21st to endNight
42%46%19%23%6%
2376
February1st to 10thNight
45%37%20%21%5%
2160
11th to 20thNight
46%36%18%19%7%
2099
21st to endNight
47%6%7%15%18%8%
1776
March1st to 10thNight
41%47%16%21%11%
2160
11th to 20thNight
42%7%11%17%18%6%
2064
21st to endNight
40%6%8%24%18%4
2084
April1st to 10thNight
35%6%12%23%19%6%
1800
11th to 20thNight
35%5%6%21%22%12%
1775
21st to endNight
32%6%9%26%21%5%
1800
May1st to 10thNight
30%7%12%21%25%5%
1639
11th to 20thNight
35%9%17%21%16%3
1593
21st to endNight
29%11%15%25%16%4
1745
June1st to 10thNight
34%11%15%20%18%2
1620
11th to 20thNight
23%9%19%29%17%3
1620
21st to endNight
31%9%17%21%18%4
1620
July1st to 10thNight
37%11%21%19%9%3
1575
11th to 20thNight
30%11%25%21%11%2
1566
21st to endNight
35%14%19%21%10%1
1695
August1st to 10thNight
27%12%23%28%9%1
1778
11th to 20thNight
34%12%20%18%12%4
1776
21st to endNight
38%10%15%21%11%4
1980
September1st to 10thNight
33%10%17%19%15%5%
1822
11th to 20thNight
36%9%11%18%22%5%
1980
21st to endNight
28%5%11%22%26%9%
1980
October1st to 10thNight
28%47%23%26%11%
1980
11th to 20thNight
32%5%7%21%24%11%
1980
21st to endNight
35%35%16%30%10%
2508
November1st to 10thNight
31%5%7%19%26%14%
2406
11th to 20thNight
33%47%17%27%12%
2470
21st to endNight
39%46%19%24%8%
2470
December1st to 10thNight
45%6%7%18%20%4
2470
11th to 20thNight
41%47%17%26%5%
3044
21st to endNight
48%5%8%20%17%2
4532

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 10thDay
30%23%31%14%3
270
11th to 20thDay
34%20%27%14%6%
249
21st to endDay
26%21%39%10%4
264
February1st to 10thDay
28%22%35%13%3
240
11th to 20thDay
39%22%31%8%
240
21st to endDay
34%21%38%7%1
198
March1st to 10thDay
25%18%40%13%3
240
11th to 20thDay
25%18%34%16%7%1
334
21st to endDay
23%17%31%21%7%
462
April1st to 10thDay
20%16%30%23%9%3
420
11th to 20thDay
19%15%31%20%13%1
412
21st to endDay
17%11%30%28%13%1
420
May1st to 10thDay
17%8%31%24%15%5%
423
11th to 20thDay
9%6%28%29%19%10%
447
21st to endDay
13%419%31%19%14%
485
June1st to 10thDay
14%316%28%26%13%
450
11th to 20thDay
7%315%29%26%20%
450
21st to endDay
12%314%27%26%19%
450
July1st to 10thDay
10%210%26%29%23%
445
11th to 20thDay
7%19%23%32%27%
444
21st to endDay
8%210%23%35%23%
488
August1st to 10thDay
11%310%22%33%22%
446
11th to 20thDay
13%38%29%32%14%
439
21st to endDay
16%28%24%32%19%
495
September1st to 10thDay
10%49%30%36%12%
450
11th to 20thDay
10%5%14%21%37%13%
450
21st to endDay
13%314%30%30%9%
450
October1st to 10thDay
11%5%23%31%22%7%
450
11th to 20thDay
14%9%26%33%15%2
450
21st to endDay
21%14%22%28%13%2
306
November1st to 10thDay
22%8%34%23%11%3
270
11th to 20thDay
15%21%37%21%6%
270
21st to endDay
16%20%35%19%9%1
270
December1st to 10thDay
32%14%33%15%5%
270
11th to 20thDay
27%20%31%14%6%1
270
21st to endDay
30%15%34%17%31
297
January1st to 10thNight
25%16%33%23%4
760
11th to 20thNight
24%17%28%23%7%
736
21st to endNight
21%17%37%22%3
792
February1st to 10thNight
23%14%33%26%4
720
11th to 20thNight
27%15%30%25%3
703
21st to endNight
28%14%33%23%2
592
March1st to 10thNight
20%16%30%28%5%
720
11th to 20thNight
19%13%32%26%8%1
720
21st to endNight
19%13%31%27%10%
698
April1st to 10thNight
14%11%33%28%12%1
540
11th to 20thNight
18%9%31%27%13%2
533
21st to endNight
11%9%29%34%15%2
540
May1st to 10thNight
10%6%27%31%23%2
540
11th to 20thNight
10%5%22%33%27%4
531
21st to endNight
7%213%35%37%6%
584
June1st to 10thNight
8%212%37%34%7%
540
11th to 20thNight
5%19%32%39%14%
540
21st to endNight
8%110%29%43%10%
540
July1st to 10thNight
10%16%25%43%16%
525
11th to 20thNight
7%16%24%46%17%
522
21st to endNight
8%18%24%44%15%
591
August1st to 10thNight
5%428%48%15%
537
11th to 20thNight
10%26%31%41%10%
534
21st to endNight
11%47%29%40%10%
594
September1st to 10thNight
9%29%29%41%9%
562
11th to 20thNight
12%412%28%38%5%
720
21st to endNight
8%314%35%37%3
720
October1st to 10thNight
10%422%30%27%6%
720
11th to 20thNight
13%7%24%34%20%2
720
21st to endNight
18%8%20%34%19%2
792
November1st to 10thNight
13%8%23%34%19%3
740
11th to 20thNight
17%10%29%30%12%1
760
21st to endNight
19%11%27%31%11%1
760
December1st to 10thNight
24%13%27%28%9%
760
11th to 20thNight
24%12%30%26%9%
760
21st to endNight
27%12%30%25%6%
836
Page generated at 2024-01-11 12:31:58. Version ac07

Copyright 2024 Attilla Danko


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