Parc National d'Aiguebelle
Clear Sky Chart
History

This sumarizes the distribution of each different forecast outcome for the Parc National d'Aiguebelle 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
26%
14987
10%
46797
6%
14954
30%
14954
13%
36016

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
15%
900
6%
2685
3%
895
18%
895
6%
2325
January16th to endNight
21%
839
7%
2693
3%
839
25%
839
7%
2237
February1st to 15thNight
23%
704
10%
2287
6%
701
28%
701
10%
1816
February16th to endNight
19%
631
8%
2051
3%
631
25%
631
9%
1676
March1st to 15thNight
25%
720
12%
2025
9%
720
29%
720
13%
1592
March16th to endNight
31%
768
18%
2094
10%
768
36%
768
20%
1528
April1st to 15thNight
24%
704
13%
1782
5%
704
28%
704
18%
1348
April16th to endNight
29%
540
17%
1620
9%
540
36%
540
21%
1132
May1st to 15thNight
30%
360
13%
1440
14%
360
37%
360
14%
983
May16th to endNight
36%
375
9%
1467
9%
374
44%
374
16%
984
June1st to 15thNight
32%
360
7%
1260
5%
360
36%
360
16%
872
June16th to endNight
41%
360
8%
1260
5%
360
44%
360
21%
793
July1st to 15thNight
39%
340
8%
1190
6%
340
42%
340
20%
741
July16th to endNight
44%
376
10%
1328
13%
354
46%
354
20%
864
August1st to 15thNight
40%
473
9%
1544
8%
471
43%
471
18%
1074
August16th to endNight
41%
600
14%
1746
9%
600
44%
600
24%
1169
September1st to 15thNight
35%
720
11%
1800
4%
720
37%
720
25%
1301
September16th to endNight
38%
693
16%
1925
9%
693
42%
693
24%
1320
October1st to 15thNight
24%
660
12%
1980
9%
660
28%
660
13%
1525
October16th to endNight
19%
704
8%
2188
6%
704
22%
704
9%
1830
November1st to 15thNight
17%
700
8%
2452
5%
700
22%
700
8%
1998
November16th to endNight
14%
720
6%
2520
4%
720
16%
720
6%
2128
December1st to 15thNight
13%
780
4%
2580
1%
780
17%
780
5%
2219
December16th to endNight
15%
960
6%
2880
3%
960
17%
960
5%
2561

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
21%11%47%6%34446%24%
48146
Night
19%13%5%8%6%35%445%23%
46953
Cloud CoverDay
21%12%47%6%35%445%24%
48156
Night
19%13%5%8%6%35%445%23%
46958
TransparencyDay
60%310%17%6%
47820
Night
62%310%16%6%
46797
SeeingDay
27%11%29%20%8%2
5910
Night
26%10%28%24%8%1
14987

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
20%18%7%13%6%345%5%410%
1253
16th to endDay
13%16%7%11%7%47%7%5%5%11%
1527
February1st to 15thDay
9%14%6%10%9%6%8%5%5%7%14%
1575
16th to endDay
13%17%6%11%7%45%445%18%
1422
March1st to 15thDay
18%10%49%7%36%44426%
1923
16th to endDay
13%13%35%6%45%5%45%31%
2130
April1st to 15thDay
22%14%47%5%2333427%
2176
16th to endDay
20%12%46%5%23335%32%
2340
May1st to 15thDay
21%9%36%5%2445%6%29%
2511
16th to endDay
25%9%34424345%31%
2645
June1st to 15thDay
23%8%35%5%35%45%6%28%
2700
16th to endDay
19%7%36%6%35%5%5%6%30%
2700
July1st to 15thDay
21%7%25%5%35%5%5%9%29%
2700
16th to endDay
19%5%36%6%36%6%5%7%28%
2745
August1st to 15thDay
23%8%36%7%345%5%6%25%
2403
16th to endDay
20%7%36%6%3445%8%28%
2444
September1st to 15thDay
24%7%25%4245%5%7%29%
2160
16th to endDay
26%9%34424336%31%
1894
October1st to 15thDay
26%12%36%5%24335%24%
1650
16th to endDay
34%19%46%5%3343411%
1681
November1st to 15thDay
25%19%7%8%5%2322417%
1406
16th to endDay
26%19%7%10%7%3333210%
1440
December1st to 15thDay
21%19%8%12%7%2444411%
1377
16th to endDay
19%20%6%10%10%5%5%4438%
1344
January1st to 15thNight
19%18%7%11%8%36%6%2411%
2685
16th to endNight
14%14%7%12%9%5%7%7%6%5%11%
2693
February1st to 15thNight
10%15%6%11%10%46%446%18%
2285
16th to endNight
14%17%7%10%8%36%445%17%
2051
March1st to 15thNight
18%12%5%8%7%45%5%5%422%
2013
16th to endNight
13%11%47%5%36%436%33%
2094
April1st to 15thNight
22%11%36%5%3434430%
1782
16th to endNight
19%9%46%5%33245%35%
1620
May1st to 15thNight
19%10%25%5%4445%5%31%
1440
16th to endNight
23%5%345%1445%7%32%
1465
June1st to 15thNight
20%6%36%6%24446%32%
1260
16th to endNight
14%425%5%35%5%6%7%39%
1260
July1st to 15thNight
19%5%24435%5%6%7%34%
1260
16th to endNight
15%6%26%7%345%5%8%35%
1420
August1st to 15thNight
18%8%26%5%45%5%46%32%
1554
16th to endNight
15%6%25%5%35%448%37%
1746
September1st to 15thNight
19%7%26%5%24346%36%
1800
16th to endNight
21%5%25%424447%37%
1925
October1st to 15thNight
22%13%5%8%5%24336%24%
1980
16th to endNight
29%15%48%6%2333416%
2188
November1st to 15thNight
23%16%7%9%5%2433418%
2452
16th to endNight
26%18%7%8%5%3333414%
2520
December1st to 15thNight
20%19%8%12%7%2443312%
2580
16th to endNight
20%20%8%12%7%36%4339%
2880

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%18%6%13%7%246%4410%
1253
16th to endDay
13%18%7%11%7%47%7%6%411%
1527
February1st to 15thDay
9%15%7%10%8%6%8%5%6%6%15%
1575
16th to endDay
13%18%7%11%7%45%44418%
1422
March1st to 15thDay
18%11%49%6%46%44425%
1934
16th to endDay
13%13%36%6%35%445%31%
2129
April1st to 15thDay
23%13%5%7%5%3333426%
2176
16th to endDay
20%11%36%5%24335%31%
2340
May1st to 15thDay
21%10%36%5%25%5%5%5%28%
2511
16th to endDay
25%9%35%424335%31%
2645
June1st to 15thDay
22%8%36%5%35%35%7%28%
2700
16th to endDay
18%7%37%5%35%5%5%6%30%
2700
July1st to 15thDay
20%6%35%5%35%5%5%8%28%
2700
16th to endDay
19%6%36%6%46%5%5%7%27%
2745
August1st to 15thDay
23%8%36%7%45%45%6%24%
2403
16th to endDay
19%7%36%6%35%5%5%7%28%
2444
September1st to 15thDay
23%8%35%4245%5%7%28%
2160
16th to endDay
25%9%34424446%31%
1894
October1st to 15thDay
26%12%27%5%2344425%
1650
16th to endDay
33%19%46%5%3433411%
1681
November1st to 15thDay
25%19%7%7%6%2332417%
1406
16th to endDay
26%19%7%10%7%3333310%
1440
December1st to 15thDay
21%20%8%12%6%2435%311%
1377
16th to endDay
19%20%6%12%9%5%5%4438%
1344
January1st to 15thNight
19%18%8%11%8%35%5%3310%
2685
16th to endNight
14%13%7%12%8%5%7%7%6%411%
2693
February1st to 15thNight
10%15%6%10%11%46%5%46%18%
2278
16th to endNight
14%17%6%11%8%45%445%17%
2051
March1st to 15thNight
18%12%6%8%6%45%5%5%422%
2025
16th to endNight
13%11%5%7%5%36%435%33%
2094
April1st to 15thNight
22%11%36%5%2434429%
1782
16th to endNight
19%9%5%7%422345%35%
1620
May1st to 15thNight
17%10%37%5%25%5%45%31%
1440
16th to endNight
23%5%3442446%7%31%
1465
June1st to 15thNight
20%7%27%5%25%447%31%
1260
16th to endNight
13%5%25%6%35%6%6%6%39%
1260
July1st to 15thNight
18%5%344246%6%8%34%
1260
16th to endNight
15%6%25%6%35%5%5%8%35%
1420
August1st to 15thNight
18%7%36%6%35%45%6%32%
1554
16th to endNight
15%5%35%6%345%5%7%37%
1746
September1st to 15thNight
18%7%36%5%33446%36%
1800
16th to endNight
20%6%2442435%7%37%
1925
October1st to 15thNight
22%14%47%6%24335%25%
1980
16th to endNight
29%16%47%5%2333416%
2188
November1st to 15thNight
23%16%6%9%5%2333418%
2452
16th to endNight
25%19%7%7%6%3333414%
2520
December1st to 15thNight
21%19%7%11%7%3443312%
2580
16th to endNight
19%21%9%12%7%36%4329%
2880

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
75%37%11%1
1254
16th to endDay
71%45%11%6%
1527
February1st to 15thDay
67%29%14%5%
1577
16th to endDay
69%27%16%4
1422
March1st to 15thDay
61%37%15%10%
1934
16th to endDay
54%47%22%9%2
2130
April1st to 15thDay
60%27%16%10%1
2176
16th to endDay
54%39%17%12%1
2340
May1st to 15thDay
55%47%19%11%1
2511
16th to endDay
55%49%20%9%
2649
June1st to 15thDay
54%38%21%10%
2700
16th to endDay
52%412%19%9%
2700
July1st to 15thDay
50%415%21%7%
2541
16th to endDay
54%413%21%5%
2574
August1st to 15thDay
58%415%18%3
2389
16th to endDay
53%415%20%6%
2444
September1st to 15thDay
53%415%19%6%
2160
16th to endDay
53%413%23%4
1894
October1st to 15thDay
61%312%14%6%1
1650
16th to endDay
77%37%8%3
1681
November1st to 15thDay
72%310%8%4
1406
16th to endDay
80%26%8%2
1440
December1st to 15thDay
76%37%10%1
1377
16th to endDay
79%35%8%2
1344
January1st to 15thNight
77%37%9%2
2685
16th to endNight
72%37%11%4
2693
February1st to 15thNight
67%39%13%6%
2287
16th to endNight
70%37%13%5%
2051
March1st to 15thNight
63%28%13%10%
2025
16th to endNight
53%37%20%12%2
2094
April1st to 15thNight
57%38%17%11%1
1782
16th to endNight
51%26%21%15%1
1620
May1st to 15thNight
53%38%18%12%1
1440
16th to endNight
50%5%11%19%11%1
1467
June1st to 15thNight
53%48%20%12%1
1260
16th to endNight
42%5%12%25%12%1
1260
July1st to 15thNight
44%416%26%7%
1190
16th to endNight
46%417%25%6%
1328
August1st to 15thNight
51%415%23%4
1544
16th to endNight
45%419%24%5%
1746
September1st to 15thNight
48%418%20%7%
1800
16th to endNight
46%316%27%5%
1925
October1st to 15thNight
62%211%15%6%
1980
16th to endNight
71%310%11%3
2188
November1st to 15thNight
70%311%11%2
2452
16th to endNight
75%39%9%2
2520
December1st to 15thNight
76%38%9%1
2580
16th to endNight
80%35%7%3
2880

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
35%15%33%11%5%
60
16th to endDay
32%17%25%20%41
75
February1st to 15thDay
20%7%44%26%1
90
16th to endDay
35%17%35%11%
81
March1st to 15thDay
26%13%35%13%10%
267
16th to endDay
21%12%35%17%10%2
288
April1st to 15thDay
29%13%29%17%7%2
270
16th to endDay
26%15%30%17%7%2
270
May1st to 15thDay
32%10%22%23%6%4
288
16th to endDay
32%12%28%18%6%1
358
June1st to 15thDay
29%10%28%22%8%
495
16th to endDay
21%12%29%25%9%2
495
July1st to 15thDay
21%10%29%27%8%1
475
16th to endDay
21%8%29%26%10%3
416
August1st to 15thDay
24%6%24%24%12%7%
313
16th to endDay
26%7%24%22%12%6%
332
September1st to 15thDay
24%8%28%21%11%4
315
16th to endDay
26%7%27%23%11%3
287
October1st to 15thDay
30%10%31%19%42
255
16th to endDay
40%13%22%15%5%2
236
November1st to 15thDay
26%21%40%10%1
60
16th to endDay
51%8%28%8%3
60
December1st to 15thDay
28%11%45%10%5%
60
16th to endDay
39%18%34%43
64
January1st to 15thNight
30%13%28%22%6%
900
16th to endNight
21%11%29%24%10%1
839
February1st to 15thNight
19%10%33%28%7%
704
16th to endNight
25%9%33%23%6%
631
March1st to 15thNight
26%18%25%24%5%
720
16th to endNight
18%12%32%27%7%1
768
April1st to 15thNight
28%13%27%21%7%
704
16th to endNight
23%7%32%28%6%1
540
May1st to 15thNight
24%8%32%23%10%
360
16th to endNight
25%7%25%31%9%1
375
June1st to 15thNight
23%6%28%30%10%
360
16th to endNight
16%7%26%35%13%
360
July1st to 15thNight
20%430%33%9%1
340
16th to endNight
16%5%25%38%14%
376
August1st to 15thNight
24%421%26%20%2
473
16th to endNight
19%7%25%30%16%1
600
September1st to 15thNight
24%6%28%25%12%1
720
16th to endNight
24%7%23%28%14%1
693
October1st to 15thNight
30%13%25%22%7%1
660
16th to endNight
39%10%23%17%6%2
704
November1st to 15thNight
33%11%29%17%6%1
700
16th to endNight
35%12%28%18%4
720
December1st to 15thNight
31%12%29%18%6%1
780
16th to endNight
31%13%25%20%8%1
960
Page generated at 2017-09-25 09:02:25. Version ac04

Copyright 2017 A. Danko


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