Sainte-Aurélie
Clear Sky Chart
History

This sumarizes the distribution of each different forecast outcome for the Sainte-Aurélie clear sky chart from 2005-11-05 to 2018-02-13.

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
18%
15311
11%
48829
5%
15279
26%
15279
11%
36920

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
4%
780
8%
2716
2%
776
12%
776
4%
2251
January16th to endNight
7%
832
9%
2912
1%
832
17%
832
6%
2329
February1st to 15thNight
7%
753
7%
2496
2%
750
14%
750
5%
2049
February16th to endNight
9%
631
11%
1893
2%
631
20%
631
8%
1494
March1st to 15thNight
12%
720
13%
2137
5%
720
22%
720
11%
1625
March16th to endNight
20%
768
16%
2056
5%
768
27%
768
14%
1546
April1st to 15thNight
16%
700
14%
1778
4%
700
22%
700
13%
1371
April16th to endNight
21%
540
15%
1620
4%
540
30%
540
14%
1157
May1st to 15thNight
22%
508
11%
1588
7%
508
29%
508
13%
1143
May16th to endNight
22%
375
10%
1455
6%
374
32%
374
10%
1037
June1st to 15thNight
20%
360
6%
1260
4%
360
25%
360
10%
972
June16th to endNight
30%
360
8%
1260
4%
360
36%
360
14%
878
July1st to 15thNight
29%
340
8%
1312
9%
340
33%
340
15%
874
July16th to endNight
31%
376
9%
1418
9%
354
40%
354
15%
947
August1st to 15thNight
39%
455
10%
1526
7%
453
44%
453
17%
1046
August16th to endNight
36%
618
17%
1764
8%
618
42%
618
25%
1133
September1st to 15thNight
29%
720
12%
1872
4%
720
33%
720
23%
1323
September16th to endNight
35%
717
19%
1980
11%
717
42%
717
26%
1296
October1st to 15thNight
24%
720
15%
2062
6%
720
32%
720
18%
1478
October16th to endNight
14%
768
9%
2496
4%
768
22%
768
10%
1934
November1st to 15thNight
20%
760
14%
2472
9%
760
28%
760
11%
1872
November16th to endNight
16%
810
12%
2734
5%
810
24%
810
9%
2104
December1st to 15thNight
8%
825
5%
2925
1%
825
13%
825
4%
2458
December16th to endNight
7%
875
8%
3097
2%
875
15%
875
4%
2603

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%12%47%6%34445%24%
49205
Night
19%12%5%8%6%34445%26%
48999
TransparencyDay
60%5%9%16%7%
48893
Night
58%5%10%16%7%
48829
SeeingDay
27%22%27%15%6%1
6577
Night
21%27%26%17%6%
15311

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
16%18%6%12%9%3444316%
1552
16th to endDay
11%15%6%13%9%35%5%4417%
1664
February1st to 15thDay
11%18%8%13%10%46%32415%
1626
16th to endDay
14%17%8%11%8%4443417%
1580
March1st to 15thDay
17%17%7%8%6%3433424%
1812
16th to endDay
16%13%6%8%6%3443428%
2166
April1st to 15thDay
22%15%46%5%2233429%
2170
16th to endDay
22%12%25%5%23345%32%
2340
May1st to 15thDay
24%11%46%5%34445%26%
2373
16th to endDay
25%9%46%5%3445%7%22%
2657
June1st to 15thDay
28%8%35%5%345%5%6%21%
2700
16th to endDay
25%7%37%7%35%5%46%23%
2700
July1st to 15thDay
19%8%36%6%36%5%6%7%26%
2564
16th to endDay
21%8%36%5%46%5%5%7%23%
2654
August1st to 15thDay
22%8%36%6%345%6%7%23%
2410
16th to endDay
19%7%25%5%3445%6%35%
2437
September1st to 15thDay
25%7%24423446%33%
2088
16th to endDay
19%6%2432346%7%38%
1980
October1st to 15thDay
23%12%36%433346%29%
1894
16th to endDay
26%19%36%42334420%
1728
November1st to 15thDay
21%18%46%5%23335%25%
1716
16th to endDay
20%18%6%9%41234422%
1553
December1st to 15thDay
21%20%8%10%7%3323314%
1365
16th to endDay
21%18%9%11%7%35%32313%
1476
January1st to 15thNight
16%16%7%13%8%35%5%4315%
2716
16th to endNight
10%15%7%12%9%46%7%3417%
2912
February1st to 15thNight
10%15%7%13%10%5%7%43417%
2495
16th to endNight
14%18%6%12%7%3432422%
1893
March1st to 15thNight
18%12%6%7%6%34345%28%
2124
16th to endNight
14%13%5%7%5%4444431%
2056
April1st to 15thNight
22%14%47%42435%426%
1778
16th to endNight
21%9%35%5%23345%33%
1620
May1st to 15thNight
22%9%45%43445%6%29%
1588
16th to endNight
24%7%35%435%435%29%
1453
June1st to 15thNight
26%9%36%5%45%35%5%23%
1260
16th to endNight
19%6%35%6%245%6%7%32%
1260
July1st to 15thNight
18%7%25%5%35%5%6%8%32%
1392
16th to endNight
18%6%25%5%35%5%6%7%33%
1514
August1st to 15thNight
16%8%25%5%35%5%6%7%34%
1536
16th to endNight
15%425%43436%7%41%
1764
September1st to 15thNight
21%6%25%423446%37%
1872
16th to endNight
19%6%23323336%46%
1980
October1st to 15thNight
21%9%46%433446%32%
2062
16th to endNight
26%16%36%42334423%
2496
November1st to 15thNight
21%13%5%6%5%24445%26%
2472
16th to endNight
20%15%5%10%5%2224325%
2734
December1st to 15thNight
21%18%8%11%8%3322315%
2925
16th to endNight
20%17%6%12%7%45%42215%
3097

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
71%45%11%6%
1553
16th to endDay
65%46%15%6%
1664
February1st to 15thDay
72%36%11%41
1629
16th to endDay
69%4411%7%1
1580
March1st to 15thDay
63%38%12%10%1
1822
16th to endDay
59%47%16%11%1
2166
April1st to 15thDay
59%27%17%9%3
2170
16th to endDay
55%48%17%11%2
2340
May1st to 15thDay
59%49%17%8%1
2373
16th to endDay
60%6%11%15%6%
2661
June1st to 15thDay
62%6%9%15%5%
2700
16th to endDay
61%5%10%15%6%
2700
July1st to 15thDay
54%7%14%17%5%
2415
16th to endDay
59%6%12%17%4
2487
August1st to 15thDay
57%8%16%14%3
2396
16th to endDay
48%5%14%23%7%
2437
September1st to 15thDay
51%5%12%19%10%
2088
16th to endDay
44%5%12%26%11%
1980
October1st to 15thDay
56%411%20%6%
1894
16th to endDay
67%38%16%3
1728
November1st to 15thDay
61%5%10%15%7%
1716
16th to endDay
65%5%7%14%6%
1553
December1st to 15thDay
74%46%11%2
1365
16th to endDay
74%447%7%1
1476
January1st to 15thNight
70%5%6%11%5%
2716
16th to endNight
65%6%6%14%6%
2912
February1st to 15thNight
69%47%12%5%
2496
16th to endNight
65%37%13%9%1
1893
March1st to 15thNight
58%5%8%16%9%2
2137
16th to endNight
55%5%7%18%11%1
2056
April1st to 15thNight
58%3418%12%2
1778
16th to endNight
52%49%17%13%3
1620
May1st to 15thNight
54%411%17%11%
1588
16th to endNight
55%6%11%16%9%
1455
June1st to 15thNight
61%5%9%16%5%
1260
16th to endNight
49%7%15%19%8%
1260
July1st to 15thNight
46%8%16%19%8%
1312
16th to endNight
49%5%16%19%8%
1418
August1st to 15thNight
46%8%18%23%3
1526
16th to endNight
38%7%18%29%6%
1764
September1st to 15thNight
46%5%12%24%9%
1872
16th to endNight
40%5%14%27%11%
1980
October1st to 15thNight
51%412%22%8%
2062
16th to endNight
63%411%15%5%
2496
November1st to 15thNight
57%6%12%15%6%1
2472
16th to endNight
62%410%16%6%
2734
December1st to 15thNight
73%47%11%2
2925
16th to endNight
73%46%9%6%
3097

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
23%35%36%4
90
16th to endDay
19%35%36%7%1
96
February1st to 15thDay
29%27%29%8%4
191
16th to endDay
26%28%30%10%3
239
March1st to 15thDay
27%33%26%10%2
270
16th to endDay
25%25%23%17%6%2
288
April1st to 15thDay
28%28%25%11%31
270
16th to endDay
25%24%28%14%5%1
270
May1st to 15thDay
35%20%26%10%41
288
16th to endDay
25%27%30%13%3
370
June1st to 15thDay
32%21%24%15%6%
495
16th to endDay
26%21%26%18%7%
495
July1st to 15thDay
26%16%32%15%8%
349
16th to endDay
23%17%29%23%4
326
August1st to 15thDay
27%14%25%22%8%1
313
16th to endDay
21%18%26%19%10%3
332
September1st to 15thDay
22%17%28%18%10%3
315
16th to endDay
18%16%27%19%12%5%
314
October1st to 15thDay
25%24%22%15%8%4
299
16th to endDay
34%22%26%12%3
288
November1st to 15thDay
28%24%21%19%41
280
16th to endDay
28%27%23%13%5%2
213
December1st to 15thDay
40%22%25%7%22
90
16th to endDay
36%28%25%9%1
96
January1st to 15thNight
19%39%31%7%1
780
16th to endNight
17%35%33%11%2
832
February1st to 15thNight
16%38%30%11%2
753
16th to endNight
23%32%28%11%2
631
March1st to 15thNight
24%29%30%13%2
720
16th to endNight
19%32%25%17%4
768
April1st to 15thNight
23%32%24%14%5%
700
16th to endNight
22%26%26%18%5%
540
May1st to 15thNight
23%27%22%17%8%1
508
16th to endNight
20%26%26%20%5%
375
June1st to 15thNight
25%22%23%20%6%
360
16th to endNight
17%23%24%24%9%
360
July1st to 15thNight
17%18%30%22%11%
340
16th to endNight
18%20%23%28%9%
376
August1st to 15thNight
16%11%23%29%17%1
455
16th to endNight
14%14%28%27%12%2
618
September1st to 15thNight
20%14%28%25%9%1
720
16th to endNight
17%17%26%24%11%1
717
October1st to 15thNight
23%20%26%20%7%1
720
16th to endNight
31%22%26%14%5%
768
November1st to 15thNight
24%26%22%16%8%
760
16th to endNight
23%31%25%12%6%
810
December1st to 15thNight
25%35%24%10%2
825
16th to endNight
26%35%21%12%3
875
Page generated at 2018-02-13 20:46:00. Version ac04

Copyright 2018 A. Danko


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