Chateau De Testa Stars
Clear Sky Chart
History

This sumarizes the distribution of each different forecast outcome for the Chateau De Testa Stars clear sky chart from 2005-11-06 to 2024-03-06.

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
33%
23493
14%
80616
10%
23391
40%
23391
16%
57497

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
12%
755
10%
4169
4%
737
21%
737
4%
3314
January11th to 20thNight
13%
759
6%
4100
2%
740
20%
740
4%
3369
January21st to endNight
15%
830
6%
4513
4%
814
22%
814
5%
3791
February1st to 10thNight
18%
760
12%
2470
7%
760
25%
760
10%
1915
February11th to 20thNight
12%
742
11%
2405
4%
740
21%
740
10%
1834
February21st to endNight
16%
628
12%
1890
4%
628
25%
628
12%
1457
March1st to 10thNight
21%
743
17%
2042
7%
743
30%
743
17%
1479
March11th to 20thNight
24%
720
18%
1980
10%
720
31%
720
18%
1406
March21st to endNight
22%
792
17%
2178
7%
792
30%
792
18%
1587
April1st to 10thNight
25%
720
14%
1868
5%
720
30%
720
20%
1365
April11th to 20thNight
30%
711
17%
1775
6%
711
35%
711
24%
1238
April21st to endNight
27%
540
19%
1620
8%
540
35%
540
21%
1103
May1st to 10thNight
36%
540
14%
1620
8%
540
41%
540
19%
1127
May11th to 20thNight
39%
531
16%
1593
10%
531
45%
531
22%
1095
May21st to endNight
53%
392
19%
1555
18%
392
61%
392
26%
871
June1st to 10thNight
50%
360
17%
1440
18%
360
57%
360
25%
832
June11th to 20thNight
51%
360
17%
1440
20%
360
57%
360
22%
862
June21st to endNight
51%
360
18%
1440
19%
360
59%
360
24%
839
July1st to 10thNight
55%
361
15%
1411
18%
361
60%
361
23%
847
July11th to 20thNight
61%
522
18%
1566
17%
522
64%
522
33%
944
July21st to endNight
61%
591
16%
1672
14%
558
63%
558
27%
1078
August1st to 10thNight
63%
537
19%
1600
15%
534
66%
534
32%
986
August11th to 20thNight
59%
534
20%
1598
15%
534
62%
534
30%
1001
August21st to endNight
59%
706
21%
1894
13%
706
61%
706
34%
1190
September1st to 10thNight
55%
720
23%
1800
13%
720
60%
720
35%
1153
September11th to 20thNight
62%
720
27%
1944
20%
720
66%
720
40%
1143
September21st to endNight
44%
720
21%
1996
15%
720
49%
720
26%
1333
October1st to 10thNight
44%
720
18%
2160
16%
720
48%
720
25%
1387
October11th to 20thNight
33%
720
17%
2160
11%
720
42%
720
22%
1442
October21st to endNight
30%
792
19%
2376
11%
792
39%
792
19%
1683
November1st to 10thNight
39%
740
22%
2282
16%
740
47%
740
25%
1445
November11th to 20thNight
27%
760
17%
2634
11%
760
36%
760
15%
1838
November21st to endNight
23%
760
15%
2660
9%
760
32%
760
13%
1926
December1st to 10thNight
17%
760
8%
2660
5%
760
21%
760
8%
2122
December11th to 20thNight
18%
759
9%
3248
5%
759
24%
759
7%
2495
December21st to endNight
17%
828
6%
4857
5%
817
23%
817
4%
4000

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
17%10%48%6%35%5%5%7%30%
78580
Night
17%11%5%7%6%3445%6%31%
80943
TransparencyDay
54%5%12%19%10%1
78296
Night
53%5%11%19%10%1
80746
SeeingDay
24%13%26%21%11%4
13725
Night
23%12%26%27%12%1
23517

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
19%20%11%10%6%2333418%
2749
11th to 20thDay
13%21%9%16%10%3323416%
2840
21st to endDay
26%20%8%11%9%3433411%
3124
February1st to 10thDay
20%17%6%10%8%3434421%
1710
11th to 20thDay
17%13%7%13%7%35%5%5%5%21%
1663
21st to endDay
21%12%5%10%7%34445%24%
1560
March1st to 10thDay
16%10%6%9%7%34446%32%
2035
11th to 20thDay
19%12%48%6%35%446%29%
1980
21st to endDay
20%11%5%8%7%345%5%6%27%
2178
April1st to 10thDay
16%10%5%7%5%45%5%5%6%31%
2092
11th to 20thDay
18%10%47%6%35%446%32%
2148
21st to endDay
23%9%36%5%34446%33%
2340
May1st to 10thDay
20%8%46%6%46%5%6%7%28%
2340
11th to 20thDay
21%7%37%6%36%5%6%7%29%
2301
21st to endDay
13%5%25%6%45%6%7%10%37%
2721
June1st to 10thDay
15%6%37%6%46%6%6%9%33%
2520
11th to 20thDay
15%6%37%6%45%6%6%9%34%
2520
21st to endDay
14%7%35%6%45%5%6%9%37%
2520
July1st to 10thDay
12%6%36%6%45%5%6%9%40%
2504
11th to 20thDay
12%6%36%6%35%6%7%10%36%
2340
21st to endDay
12%6%37%7%47%7%6%8%34%
2547
August1st to 10thDay
10%6%27%8%5%6%6%7%10%33%
2327
11th to 20thDay
13%7%37%6%36%6%7%9%34%
2303
21st to endDay
12%5%35%6%36%6%8%9%37%
2444
September1st to 10thDay
16%6%35%5%35%5%46%42%
2160
11th to 20thDay
12%6%25%5%35%5%6%8%43%
2012
21st to endDay
19%7%45%5%35%45%7%37%
1962
October1st to 10thDay
17%6%35%6%345%6%7%37%
1800
11th to 20thDay
21%7%36%5%35%46%6%33%
1800
21st to endDay
24%10%37%5%3435%7%29%
1980
November1st to 10thDay
12%7%36%7%35%5%5%7%41%
1794
11th to 20thDay
19%13%36%444446%32%
1544
21st to endDay
19%14%5%7%7%35%5%46%24%
1520
December1st to 10thDay
20%18%8%10%6%35%435%17%
1520
11th to 20thDay
20%17%9%10%5%34436%20%
1910
21st to endDay
25%22%7%10%6%2333414%
2772
January1st to 10thNight
17%20%10%11%6%3443418%
4193
11th to 20thNight
17%18%8%13%8%5%5%44415%
4120
21st to endNight
29%16%7%8%8%3433316%
4532
February1st to 10thNight
19%13%6%10%7%45%435%24%
2470
11th to 20thNight
19%12%5%10%7%35%446%24%
2403
21st to endNight
20%12%5%11%6%4445%5%25%
1890
March1st to 10thNight
17%10%46%6%445%5%7%32%
2042
11th to 20thNight
20%10%36%5%33447%35%
1980
21st to endNight
17%11%5%8%5%34446%34%
2178
April1st to 10thNight
18%12%45%444436%35%
1868
11th to 20thNight
15%8%36%5%35%5%5%7%37%
1775
21st to endNight
15%8%47%5%3445%7%36%
1620
May1st to 10thNight
19%7%36%5%36%5%5%6%34%
1620
11th to 20thNight
18%6%36%5%345%5%8%36%
1592
21st to endNight
10%5%25%5%345%6%11%44%
1554
June1st to 10thNight
11%5%35%5%3446%9%44%
1440
11th to 20thNight
13%5%36%445%5%5%9%41%
1440
21st to endNight
10%5%246%35%5%7%10%43%
1440
July1st to 10thNight
9%5%37%6%35%46%9%44%
1451
11th to 20thNight
9%5%25%5%35%5%7%10%45%
1620
21st to endNight
9%6%36%5%5%5%6%7%10%38%
1771
August1st to 10thNight
7%6%35%6%35%5%7%9%45%
1611
11th to 20thNight
10%7%35%5%345%5%9%43%
1598
21st to endNight
10%5%24435%6%7%9%44%
1894
September1st to 10thNight
12%6%24435%5%6%6%48%
1800
11th to 20thNight
10%42442436%9%52%
1944
21st to endNight
15%7%35%5%345%5%6%42%
1996
October1st to 10thNight
14%6%36%5%3445%6%43%
2160
11th to 20thNight
18%6%35%6%44447%38%
2160
21st to endNight
23%9%35%5%44437%34%
2376
November1st to 10thNight
14%8%35%5%246%5%7%42%
2282
11th to 20thNight
19%10%46%6%35%5%5%6%31%
2634
21st to endNight
19%14%36%6%44446%29%
2660
December1st to 10thNight
22%15%9%9%6%34445%19%
2660
11th to 20thNight
19%16%6%9%7%34445%23%
3285
21st to endNight
25%16%7%9%7%44445%14%
4884

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
72%38%12%5%
2750
11th to 20thDay
75%27%12%31
2840
21st to endDay
79%38%8%2
3124
February1st to 10thDay
68%39%13%6%
1710
11th to 20thDay
65%410%14%6%
1672
21st to endDay
63%310%16%7%1
1560
March1st to 10thDay
54%413%21%8%
2035
11th to 20thDay
58%410%17%10%2
1980
21st to endDay
58%48%18%10%1
2178
April1st to 10thDay
53%411%18%12%2
2092
11th to 20thDay
52%5%10%17%14%2
2148
21st to endDay
53%49%21%11%2
2340
May1st to 10thDay
53%5%13%19%9%2
2340
11th to 20thDay
54%7%10%15%11%2
2305
21st to endDay
40%8%18%22%9%2
2721
June1st to 10thDay
46%6%14%21%11%1
2520
11th to 20thDay
46%6%15%20%12%1
2520
21st to endDay
43%6%12%27%10%1
2520
July1st to 10thDay
42%7%13%21%14%3
2434
11th to 20thDay
41%6%14%25%14%1
2271
21st to endDay
44%7%14%20%14%1
2405
August1st to 10thDay
43%6%16%27%8%
2314
11th to 20thDay
44%7%15%23%10%1
2303
21st to endDay
41%7%12%24%13%3
2444
September1st to 10thDay
43%6%10%21%17%4
2160
11th to 20thDay
38%5%14%27%14%1
2012
21st to endDay
47%5%11%22%15%1
1962
October1st to 10thDay
44%5%13%22%14%1
1800
11th to 20thDay
50%5%12%25%9%
1800
21st to endDay
56%412%18%9%1
1980
November1st to 10thDay
44%5%12%21%16%2
1794
11th to 20thDay
54%411%19%9%2
1544
21st to endDay
61%413%17%5%1
1520
December1st to 10thDay
71%410%12%3
1520
11th to 20thDay
68%311%15%3
1906
21st to endDay
76%39%10%2
2772
January1st to 10thNight
70%49%14%3
4193
11th to 20thNight
73%410%11%2
4120
21st to endNight
75%36%12%3
4532
February1st to 10thNight
64%310%17%7%
2470
11th to 20thNight
62%410%17%7%
2405
21st to endNight
61%5%9%15%10%1
1890
March1st to 10thNight
52%410%22%11%1
2042
11th to 20thNight
51%412%22%10%2
1980
21st to endNight
53%5%8%18%14%3
2178
April1st to 10thNight
51%5%9%19%14%2
1868
11th to 20thNight
45%6%11%19%16%3
1775
21st to endNight
48%410%23%12%3
1620
May1st to 10thNight
49%5%10%19%12%4
1620
11th to 20thNight
47%6%11%18%15%2
1593
21st to endNight
34%7%16%28%14%2
1555
June1st to 10thNight
37%6%15%25%15%2
1440
11th to 20thNight
40%6%14%24%14%2
1440
21st to endNight
36%8%15%24%17%1
1440
July1st to 10thNight
38%7%11%22%17%4
1411
11th to 20thNight
33%7%15%25%18%2
1566
21st to endNight
39%8%14%22%15%3
1672
August1st to 10thNight
35%6%15%27%17%
1600
11th to 20thNight
37%6%15%25%14%2
1598
21st to endNight
35%7%14%26%15%4
1894
September1st to 10thNight
35%6%12%24%19%5%
1800
11th to 20thNight
30%5%15%28%22%1
1944
21st to endNight
44%412%22%17%1
1996
October1st to 10thNight
41%6%13%24%14%2
2160
11th to 20thNight
47%311%25%13%1
2160
21st to endNight
52%411%21%11%1
2376
November1st to 10thNight
41%412%22%16%4
2282
11th to 20thNight
53%49%21%10%2
2634
21st to endNight
57%411%22%6%1
2660
December1st to 10thNight
68%412%12%4
2660
11th to 20thNight
65%411%17%3
3288
21st to endNight
73%410%10%2
4884

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%27%26%12%41
247
11th to 20thDay
37%28%25%7%31
270
21st to endDay
34%21%33%8%3
297
February1st to 10thDay
36%21%34%7%1
270
11th to 20thDay
41%25%26%8%1
270
21st to endDay
40%25%26%8%1
268
March1st to 10thDay
30%20%29%16%4
440
11th to 20thDay
35%18%30%13%41
420
21st to endDay
32%18%28%16%41
462
April1st to 10thDay
31%17%26%18%7%1
420
11th to 20thDay
27%17%28%15%9%4
412
21st to endDay
32%17%29%16%42
420
May1st to 10thDay
30%14%26%18%7%4
423
11th to 20thDay
23%11%33%20%9%3
447
21st to endDay
16%8%27%26%16%6%
485
June1st to 10thDay
15%12%29%26%16%3
450
11th to 20thDay
19%13%23%27%14%5%
450
21st to endDay
16%10%30%27%14%3
450
July1st to 10thDay
16%6%17%28%22%10%
445
11th to 20thDay
13%6%25%32%16%9%
444
21st to endDay
14%426%30%17%8%
488
August1st to 10thDay
12%7%21%28%22%11%
446
11th to 20thDay
15%6%21%29%18%12%
439
21st to endDay
14%5%23%26%21%11%
495
September1st to 10thDay
20%6%20%26%19%8%
450
11th to 20thDay
14%420%30%22%10%
450
21st to endDay
23%11%22%23%15%5%
450
October1st to 10thDay
19%10%26%23%18%5%
450
11th to 20thDay
26%14%28%22%8%1
450
21st to endDay
34%12%29%17%7%1
495
November1st to 10thDay
21%15%30%20%11%3
392
11th to 20thDay
32%18%29%14%5%2
192
21st to endDay
23%19%44%12%21
180
December1st to 10thDay
36%23%24%13%31
180
11th to 20thDay
35%21%28%13%3
180
21st to endDay
37%17%31%11%4
198
January1st to 10thNight
29%19%33%14%3
760
11th to 20thNight
33%18%29%18%3
760
21st to endNight
31%17%30%19%3
836
February1st to 10thNight
31%17%26%24%2
760
11th to 20thNight
32%18%34%15%1
743
21st to endNight
31%15%32%20%2
628
March1st to 10thNight
26%18%31%23%3
743
11th to 20thNight
30%16%27%19%7%1
720
21st to endNight
23%16%33%22%5%1
792
April1st to 10thNight
28%14%29%22%6%1
720
11th to 20thNight
23%13%32%21%9%1
711
21st to endNight
21%9%35%29%6%
540
May1st to 10thNight
22%9%24%34%9%1
540
11th to 20thNight
21%8%26%33%11%1
531
21st to endNight
11%424%35%24%3
394
June1st to 10thNight
13%325%41%16%1
360
11th to 20thNight
12%7%21%39%19%1
360
21st to endNight
12%327%37%20%1
360
July1st to 10thNight
11%319%38%25%4
361
11th to 20thNight
11%316%35%30%5%
522
21st to endNight
11%313%44%27%2
591
August1st to 10thNight
11%113%43%28%3
537
11th to 20thNight
13%6%12%36%29%4
534
21st to endNight
12%418%33%29%5%
706
September1st to 10thNight
15%320%32%27%4
720
11th to 20thNight
12%417%36%28%4
720
21st to endNight
18%8%23%27%20%5%
720
October1st to 10thNight
17%9%22%29%22%2
720
11th to 20thNight
22%9%31%28%9%1
720
21st to endNight
28%13%25%27%7%
792
November1st to 10thNight
19%11%26%31%12%
740
11th to 20thNight
28%13%27%23%8%1
760
21st to endNight
29%14%29%21%7%
760
December1st to 10thNight
33%18%26%18%5%
760
11th to 20thNight
29%18%29%21%3
760
21st to endNight
30%17%28%22%3
836
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