Observatoire "Hawaii mini" du star pit
Clear Sky Chart
History

This sumarizes the distribution of each different forecast outcome for the Observatoire "Hawaii mini" du star pit clear sky chart from 2005-11-06 to 2024-01-16.

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
20%
22827
11%
74924
5%
22775
28%
22775
12%
55703

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
7%
770
8%
2671
1%
767
15%
767
5%
2208
January11th to 20thNight
12%
741
10%
2591
2%
741
20%
741
6%
2030
January21st to endNight
14%
792
12%
2772
3%
792
26%
792
10%
2011
February1st to 10thNight
11%
720
10%
2476
3%
720
21%
720
8%
1911
February11th to 20thNight
7%
702
8%
2153
1%
700
16%
700
7%
1700
February21st to endNight
14%
592
16%
1776
5%
592
27%
592
12%
1330
March1st to 10thNight
15%
720
15%
2160
6%
720
25%
720
12%
1628
March11th to 20thNight
15%
720
13%
2039
4%
720
23%
720
13%
1531
March21st to endNight
20%
792
15%
2093
5%
792
27%
792
16%
1598
April1st to 10thNight
16%
720
12%
1800
3%
720
22%
720
13%
1430
April11th to 20thNight
20%
587
16%
1651
6%
587
27%
587
17%
1184
April21st to endNight
21%
540
14%
1620
6%
540
28%
540
13%
1220
May1st to 10thNight
25%
540
12%
1620
8%
540
32%
540
16%
1199
May11th to 20thNight
29%
369
16%
1431
12%
369
42%
369
15%
974
May21st to endNight
26%
389
11%
1436
8%
388
36%
388
14%
1003
June1st to 10thNight
27%
360
6%
1260
5%
360
31%
360
13%
929
June11th to 20thNight
36%
360
11%
1260
10%
360
42%
360
19%
836
June21st to endNight
30%
360
7%
1260
6%
360
34%
360
14%
913
July1st to 10thNight
30%
350
9%
1266
7%
350
38%
350
17%
856
July11th to 20thNight
36%
348
9%
1392
10%
348
41%
348
16%
922
July21st to endNight
40%
394
9%
1486
10%
372
42%
372
16%
983
August1st to 10thNight
39%
394
12%
1458
9%
392
46%
392
20%
951
August11th to 20thNight
37%
532
10%
1596
6%
532
41%
532
19%
1131
August21st to endNight
34%
645
18%
1833
9%
645
39%
645
23%
1227
September1st to 10thNight
31%
720
12%
1813
5%
720
34%
720
24%
1283
September11th to 20thNight
33%
720
13%
1980
6%
720
38%
720
23%
1361
September21st to endNight
31%
720
18%
1980
10%
720
36%
720
23%
1373
October1st to 10thNight
25%
720
19%
1988
8%
720
35%
720
20%
1384
October11th to 20thNight
21%
720
10%
2291
4%
720
28%
720
12%
1741
October21st to endNight
14%
792
9%
2574
3%
792
22%
792
10%
1996
November1st to 10thNight
16%
740
12%
2407
4%
740
25%
740
10%
1807
November11th to 20thNight
20%
782
15%
2514
9%
782
28%
782
11%
1889
November21st to endNight
14%
850
9%
2793
4%
850
21%
850
8%
2205
December1st to 10thNight
12%
850
6%
2850
2%
850
16%
850
7%
2367
December11th to 20thNight
11%
850
9%
3476
3%
848
19%
848
5%
2743
December21st to endNight
9%
926
7%
5158
2%
906
16%
906
3%
3849

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
19%12%47%6%3445%6%29%
74574
Night
18%13%5%8%6%34445%29%
75225
TransparencyDay
56%7%11%17%8%1
74276
Night
56%7%11%17%8%1
75058
SeeingDay
25%20%32%17%6%1
14346
Night
23%19%31%20%6%1
22837

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 10thDay
16%19%7%11%9%45%445%17%
1492
11th to 20thDay
15%17%7%10%9%4434423%
1480
21st to endDay
8%12%7%10%9%36%5%5%5%28%
1584
February1st to 10thDay
11%16%6%11%10%6%5%5%45%20%
1483
11th to 20thDay
14%17%7%11%9%35%34323%
1692
21st to endDay
12%14%7%10%9%34445%28%
1480
March1st to 10thDay
14%15%6%10%6%3445%5%27%
1797
11th to 20thDay
16%14%6%9%7%34445%27%
1921
21st to endDay
17%12%5%9%7%35%445%29%
2261
April1st to 10thDay
23%15%49%6%34346%25%
2160
11th to 20thDay
20%14%35%5%24435%36%
2258
21st to endDay
23%12%37%5%34446%29%
2340
May1st to 10thDay
22%11%36%5%34446%32%
2340
11th to 20thDay
22%9%36%5%35%346%33%
2478
21st to endDay
21%8%47%7%345%5%6%30%
2840
June1st to 10thDay
23%8%36%6%35%6%6%8%25%
2700
11th to 20thDay
22%7%25%5%36%46%6%33%
2700
21st to endDay
24%9%48%7%45%45%6%25%
2700
July1st to 10thDay
19%8%36%6%446%6%8%30%
2654
11th to 20thDay
17%7%37%6%35%6%7%8%31%
2520
21st to endDay
20%7%36%6%46%6%5%7%31%
2744
August1st to 10thDay
20%8%36%6%46%5%7%8%26%
2453
11th to 20thDay
16%8%37%6%45%5%6%6%34%
2304
21st to endDay
18%7%36%5%35%5%5%7%36%
2520
September1st to 10thDay
21%7%26%43445%7%37%
2147
11th to 20thDay
21%7%2442245%6%43%
1980
21st to endDay
22%8%2443345%6%38%
1980
October1st to 10thDay
20%12%36%4345%47%33%
1972
11th to 20thDay
24%15%47%5%34446%24%
1666
21st to endDay
28%14%37%5%34445%22%
1782
November1st to 10thDay
19%17%47%6%4345%5%28%
1671
11th to 20thDay
20%16%6%9%6%3444423%
1663
21st to endDay
19%19%5%12%6%3434422%
1383
December1st to 10thDay
22%18%8%9%7%3443418%
1330
11th to 20thDay
17%17%7%10%7%45%33325%
1668
21st to endDay
21%16%7%11%7%3443422%
2431
January1st to 10thNight
15%18%9%12%9%46%43417%
2671
11th to 20thNight
15%15%7%12%9%45%44422%
2591
21st to endNight
10%12%6%9%9%5%6%6%6%6%26%
2772
February1st to 10thNight
11%15%6%11%10%46%5%45%24%
2476
11th to 20thNight
12%17%8%12%8%445%4423%
2151
21st to endNight
13%16%5%9%7%5%5%435%28%
1776
March1st to 10thNight
15%14%6%8%7%35%445%28%
2150
11th to 20thNight
16%14%5%8%6%45%5%4430%
2038
21st to endNight
18%13%5%9%6%34345%29%
2093
April1st to 10thNight
22%15%6%7%5%24435%26%
1800
11th to 20thNight
20%11%36%5%345%6%6%32%
1651
21st to endNight
24%12%5%7%6%3334431%
1620
May1st to 10thNight
23%11%46%43446%430%
1620
11th to 20thNight
21%8%36%6%24445%35%
1430
21st to endNight
22%8%36%5%44446%35%
1435
June1st to 10thNight
22%10%46%6%5%6%5%5%7%26%
1260
11th to 20thNight
17%9%35%5%35%45%7%37%
1260
21st to endNight
21%8%47%5%35%5%5%8%30%
1260
July1st to 10thNight
16%8%38%5%25%5%5%9%33%
1303
11th to 20thNight
17%6%36%6%46%6%5%9%34%
1440
21st to endNight
16%7%26%6%46%5%5%8%34%
1574
August1st to 10thNight
17%6%25%5%35%5%6%8%38%
1468
11th to 20thNight
19%7%26%5%446%5%9%33%
1596
21st to endNight
18%6%16%5%35%45%7%39%
1833
September1st to 10thNight
19%7%35%6%35%45%6%38%
1813
11th to 20thNight
21%7%35%423446%41%
1980
21st to endNight
21%7%25%5%2444441%
1980
October1st to 10thNight
20%11%37%42445%5%38%
1988
11th to 20thNight
26%13%36%5%34445%28%
2291
21st to endNight
24%15%45%5%35%446%26%
2574
November1st to 10thNight
20%14%47%6%45%5%46%27%
2407
11th to 20thNight
18%13%5%10%6%34445%28%
2514
21st to endNight
18%17%7%11%6%3444423%
2793
December1st to 10thNight
20%18%7%10%6%4444417%
2850
11th to 20thNight
18%16%7%11%8%45%44420%
3531
21st to endNight
19%20%5%9%6%2333326%
5236

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
69%6%7%11%6%1
1493
11th to 20thDay
66%47%14%7%2
1480
21st to endDay
56%6%9%16%12%1
1584
February1st to 10thDay
67%6%8%10%8%1
1483
11th to 20thDay
67%5%9%10%8%1
1701
21st to endDay
60%47%17%8%3
1480
March1st to 10thDay
60%5%9%13%11%2
1800
11th to 20thDay
60%5%9%14%11%1
1921
21st to endDay
58%6%9%16%9%3
2261
April1st to 10thDay
63%5%10%12%8%2
2160
11th to 20thDay
53%49%21%12%2
2258
21st to endDay
57%5%9%16%11%3
2340
May1st to 10thDay
54%5%10%16%13%2
2340
11th to 20thDay
53%6%10%20%10%1
2482
21st to endDay
53%8%11%20%8%
2840
June1st to 10thDay
56%8%11%18%6%1
2700
11th to 20thDay
50%7%13%19%9%1
2700
21st to endDay
60%7%10%15%7%
2700
July1st to 10thDay
50%10%14%19%6%
2581
11th to 20thDay
49%10%14%20%7%
2445
21st to endDay
53%9%12%19%6%1
2591
August1st to 10thDay
54%10%17%18%2
2439
11th to 20thDay
50%9%15%19%7%
2304
21st to endDay
47%9%13%23%7%
2520
September1st to 10thDay
47%7%14%22%10%
2147
11th to 20thDay
42%6%14%26%12%
1980
21st to endDay
47%6%12%24%11%1
1980
October1st to 10thDay
52%5%10%23%9%
1972
11th to 20thDay
61%7%15%14%3
1666
21st to endDay
65%6%8%14%5%1
1782
November1st to 10thDay
59%6%12%17%6%
1671
11th to 20thDay
63%7%9%14%6%1
1663
21st to endDay
67%7%9%13%4
1383
December1st to 10thDay
71%5%8%12%5%
1330
11th to 20thDay
64%5%7%16%8%1
1668
21st to endDay
67%5%8%12%7%1
2431
January1st to 10thNight
71%5%7%12%5%1
2671
11th to 20thNight
64%5%9%12%8%1
2591
21st to endNight
54%8%8%16%12%2
2772
February1st to 10thNight
61%7%9%14%10%1
2476
11th to 20thNight
63%5%9%13%8%1
2153
21st to endNight
57%5%7%17%12%1
1776
March1st to 10thNight
57%6%8%18%9%2
2160
11th to 20thNight
54%7%11%16%11%2
2039
21st to endNight
57%49%17%10%3
2093
April1st to 10thNight
60%5%8%14%10%3
1800
11th to 20thNight
49%7%9%21%13%1
1651
21st to endNight
58%5%6%17%12%2
1620
May1st to 10thNight
55%6%10%15%13%2
1620
11th to 20thNight
49%7%10%20%13%1
1431
21st to endNight
50%8%10%17%14%
1436
June1st to 10thNight
55%8%14%17%6%
1260
11th to 20thNight
46%7%12%22%11%3
1260
21st to endNight
52%9%14%16%9%1
1260
July1st to 10thNight
45%10%17%21%7%
1266
11th to 20thNight
45%10%17%22%6%1
1392
21st to endNight
46%9%18%20%7%
1486
August1st to 10thNight
40%11%19%27%2
1458
11th to 20thNight
47%10%19%18%6%
1596
21st to endNight
42%8%15%28%7%
1833
September1st to 10thNight
44%8%13%23%10%1
1813
11th to 20thNight
45%6%17%23%9%
1980
21st to endNight
44%7%11%25%11%1
1980
October1st to 10thNight
47%5%12%24%11%1
1988
11th to 20thNight
58%7%12%19%5%
2291
21st to endNight
60%7%11%14%7%1
2574
November1st to 10thNight
57%8%12%18%6%
2407
11th to 20thNight
56%7%11%16%9%1
2514
21st to endNight
63%7%11%14%5%
2793
December1st to 10thNight
69%6%10%11%3
2850
11th to 20thNight
66%5%9%13%8%
3532
21st to endNight
64%49%14%8%1
5236

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
24%30%36%7%21
180
11th to 20thDay
29%27%31%9%4
170
21st to endDay
18%32%33%13%21
176
February1st to 10thDay
25%33%31%7%3
203
11th to 20thDay
23%32%34%9%1
391
21st to endDay
23%32%28%14%3
346
March1st to 10thDay
26%25%32%13%3
420
11th to 20thDay
26%24%32%13%5%1
420
21st to endDay
23%27%28%15%6%2
462
April1st to 10thDay
32%25%23%14%5%
420
11th to 20thDay
28%25%28%16%31
412
21st to endDay
31%20%33%12%32
420
May1st to 10thDay
28%18%36%14%31
423
11th to 20thDay
26%15%36%17%6%1
447
21st to endDay
21%20%36%18%5%1
600
June1st to 10thDay
26%15%37%16%7%
630
11th to 20thDay
23%17%29%24%8%
630
21st to endDay
26%14%30%23%7%1
630
July1st to 10thDay
20%14%36%22%8%
576
11th to 20thDay
19%14%40%19%7%
444
21st to endDay
19%13%41%21%6%
488
August1st to 10thDay
20%15%33%23%8%2
446
11th to 20thDay
17%14%33%24%11%1
439
21st to endDay
20%18%28%21%10%4
495
September1st to 10thDay
21%18%28%20%10%3
450
11th to 20thDay
24%14%32%19%9%2
450
21st to endDay
20%18%34%16%8%4
450
October1st to 10thDay
23%19%28%21%8%2
446
11th to 20thDay
30%18%29%14%7%1
360
21st to endDay
32%27%27%11%4
396
November1st to 10thDay
32%21%32%12%3
365
11th to 20thDay
27%25%25%16%6%1
370
21st to endDay
28%29%30%11%1
233
December1st to 10thDay
30%18%32%16%31
180
11th to 20thDay
32%29%28%9%11
180
21st to endDay
36%25%26%12%1
198
January1st to 10thNight
23%28%35%12%1
770
11th to 20thNight
22%27%32%16%2
741
21st to endNight
15%25%38%18%41
792
February1st to 10thNight
18%30%35%13%4
720
11th to 20thNight
23%28%33%13%3
703
21st to endNight
24%23%33%17%4
592
March1st to 10thNight
22%22%37%16%3
720
11th to 20thNight
22%24%35%12%6%1
720
21st to endNight
22%20%30%22%6%
792
April1st to 10thNight
28%20%31%16%4
720
11th to 20thNight
25%17%32%19%6%
587
21st to endNight
30%14%29%20%6%1
540
May1st to 10thNight
26%13%30%24%7%1
540
11th to 20thNight
25%11%28%27%8%1
369
21st to endNight
24%13%31%24%7%1
389
June1st to 10thNight
25%9%31%29%6%
360
11th to 20thNight
17%9%31%32%10%
360
21st to endNight
21%10%32%27%9%1
360
July1st to 10thNight
15%9%39%27%9%
350
11th to 20thNight
17%9%33%31%9%1
348
21st to endNight
16%6%30%37%9%1
394
August1st to 10thNight
16%6%32%30%15%1
394
11th to 20thNight
19%8%29%32%12%1
532
21st to endNight
17%11%31%29%11%2
645
September1st to 10thNight
20%10%32%26%11%1
720
11th to 20thNight
22%11%29%25%11%1
720
21st to endNight
21%13%30%23%11%
720
October1st to 10thNight
22%18%29%23%7%1
720
11th to 20thNight
25%21%27%19%8%1
720
21st to endNight
28%21%32%14%5%
792
November1st to 10thNight
29%22%29%17%4
740
11th to 20thNight
24%26%26%18%6%1
782
21st to endNight
27%24%30%15%41
850
December1st to 10thNight
29%21%31%14%5%
850
11th to 20thNight
26%26%28%15%4
850
21st to endNight
29%27%26%15%3
935
Page generated at 2024-01-13 01:38:12. Version ac07

Copyright 2024 Attilla Danko


Observatoire "Hawaii mini" du star pit Clear Sky Chart |Charts Home