Saint-Agapit
Clear Sky Chart
History

This sumarizes the distribution of each different forecast outcome for the Saint-Agapit clear sky chart from 2005-11-06 to 2024-01-10.

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
25%
22711
12%
74835
6%
22664
32%
22664
13%
55470

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
10%
760
8%
2647
2%
757
18%
757
6%
2186
January11th to 20thNight
13%
720
9%
2520
2%
720
21%
720
7%
2010
January21st to endNight
20%
792
11%
2772
5%
792
29%
792
11%
2075
February1st to 10thNight
15%
720
10%
2516
4%
720
25%
720
9%
1959
February11th to 20thNight
12%
703
10%
2100
2%
700
21%
700
9%
1679
February21st to endNight
19%
592
14%
1776
6%
592
29%
592
15%
1328
March1st to 10thNight
19%
720
14%
2160
6%
720
28%
720
14%
1633
March11th to 20thNight
20%
720
13%
2078
5%
720
28%
720
13%
1583
March21st to endNight
27%
792
17%
2036
6%
792
34%
792
19%
1534
April1st to 10thNight
19%
720
11%
1800
3%
720
23%
720
16%
1405
April11th to 20thNight
24%
635
16%
1699
6%
635
30%
635
20%
1240
April21st to endNight
23%
540
14%
1620
7%
540
29%
540
16%
1187
May1st to 10thNight
26%
505
12%
1585
8%
505
33%
505
16%
1154
May11th to 20thNight
29%
354
16%
1416
16%
354
39%
354
15%
951
May21st to endNight
29%
389
11%
1551
8%
388
40%
388
15%
1032
June1st to 10thNight
32%
360
9%
1281
7%
360
38%
360
15%
903
June11th to 20thNight
38%
360
11%
1260
11%
360
44%
360
18%
861
June21st to endNight
36%
360
8%
1274
8%
360
40%
360
15%
919
July1st to 10thNight
37%
350
9%
1400
11%
350
43%
350
17%
916
July11th to 20thNight
43%
348
11%
1392
15%
348
48%
348
17%
910
July21st to endNight
45%
394
10%
1486
11%
372
48%
372
16%
986
August1st to 10thNight
51%
358
13%
1422
13%
356
56%
356
19%
901
August11th to 20thNight
43%
525
11%
1589
7%
525
46%
525
19%
1116
August21st to endNight
42%
713
17%
1901
9%
713
45%
713
24%
1300
September1st to 10thNight
40%
720
12%
1800
5%
720
42%
720
27%
1273
September11th to 20thNight
44%
720
15%
1955
8%
720
49%
720
28%
1311
September21st to endNight
37%
720
19%
1980
12%
720
42%
720
26%
1351
October1st to 10thNight
35%
720
20%
1984
12%
720
42%
720
22%
1399
October11th to 20thNight
27%
720
12%
2304
6%
720
34%
720
14%
1713
October21st to endNight
18%
792
10%
2574
4%
792
26%
792
12%
1962
November1st to 10thNight
23%
740
12%
2407
6%
740
31%
740
13%
1776
November11th to 20thNight
22%
760
15%
2470
10%
760
30%
760
12%
1866
November21st to endNight
18%
814
10%
2764
4%
814
25%
814
9%
2170
December1st to 10thNight
14%
850
6%
2850
2%
850
19%
850
7%
2331
December11th to 20thNight
15%
850
8%
3470
3%
848
21%
848
6%
2730
December21st to endNight
11%
875
7%
4996
1%
861
19%
861
4%
3820

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%10%47%6%3445%6%30%
74524
Night
19%12%48%6%34445%29%
75138
TransparencyDay
54%7%12%18%8%1
74229
Night
56%6%11%17%8%1
74968
SeeingDay
25%16%29%20%9%2
14005
Night
25%12%30%25%7%
22722

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
18%18%7%11%8%35%44417%
1509
11th to 20thDay
17%18%7%10%7%3443423%
1440
21st to endDay
9%15%6%9%8%46%5%5%6%27%
1584
February1st to 10thDay
13%16%8%12%10%4434422%
1442
11th to 20thDay
14%16%7%10%7%45%446%22%
1747
21st to endDay
13%15%7%10%6%3445%6%27%
1480
March1st to 10thDay
17%13%6%9%7%34446%29%
1797
11th to 20thDay
18%12%6%7%5%445%4430%
1881
21st to endDay
17%11%49%6%345%5%6%31%
2317
April1st to 10thDay
24%11%5%9%5%35%335%27%
2160
11th to 20thDay
20%10%36%5%24336%37%
2209
21st to endDay
24%11%47%5%3444430%
2340
May1st to 10thDay
23%9%46%5%35%446%33%
2389
11th to 20thDay
18%8%45%5%345%6%7%34%
2478
21st to endDay
20%7%47%6%35%5%6%6%31%
2725
June1st to 10thDay
21%6%36%6%5%6%6%6%7%28%
2675
11th to 20thDay
19%6%35%5%35%5%6%8%35%
2700
21st to endDay
23%7%47%5%45%6%5%7%28%
2681
July1st to 10thDay
16%6%46%6%46%5%6%9%33%
2520
11th to 20thDay
14%7%37%6%35%6%7%10%32%
2520
21st to endDay
16%7%45%6%36%6%7%8%32%
2744
August1st to 10thDay
18%7%37%6%46%5%7%10%28%
2495
11th to 20thDay
17%6%35%6%45%5%6%8%37%
2304
21st to endDay
18%6%26%5%4446%7%38%
2452
September1st to 10thDay
18%5%26%6%345%5%8%37%
2160
11th to 20thDay
18%6%25%42335%7%45%
2004
21st to endDay
20%7%35%5%3445%6%39%
1980
October1st to 10thDay
22%7%37%6%335%5%7%32%
1973
11th to 20thDay
22%10%48%7%35%6%5%5%25%
1656
21st to endDay
29%13%36%6%44445%22%
1782
November1st to 10thDay
21%10%47%7%34345%31%
1671
11th to 20thDay
22%14%5%9%7%23445%24%
1710
21st to endDay
23%17%5%8%6%3444423%
1411
December1st to 10thDay
25%16%6%11%5%3334320%
1330
11th to 20thDay
21%14%5%10%7%4434424%
1668
21st to endDay
25%16%5%9%6%34445%20%
2590
January1st to 10thNight
18%19%8%11%7%35%33418%
2647
11th to 20thNight
18%17%6%9%7%45%44421%
2520
21st to endNight
11%13%6%11%8%5%6%5%45%26%
2772
February1st to 10thNight
13%14%6%11%10%45%5%45%22%
2516
11th to 20thNight
14%15%7%12%7%5%444423%
2098
21st to endNight
15%15%6%9%7%3435%5%29%
1776
March1st to 10thNight
17%15%47%6%45%44429%
2150
11th to 20thNight
19%11%46%8%5%5%45%5%28%
2077
21st to endNight
19%11%47%6%34445%33%
2036
April1st to 10thNight
23%12%5%7%5%2445%6%27%
1800
11th to 20thNight
22%9%36%5%345%5%6%33%
1699
21st to endNight
26%10%36%6%23445%32%
1620
May1st to 10thNight
23%9%36%6%35%44432%
1585
11th to 20thNight
22%8%36%5%24446%35%
1415
21st to endNight
22%7%36%43445%6%37%
1550
June1st to 10thNight
22%9%35%6%35%5%6%8%29%
1281
11th to 20thNight
20%7%36%6%345%5%7%34%
1260
21st to endNight
19%8%38%7%35%6%5%6%31%
1274
July1st to 10thNight
16%6%46%6%35%5%7%8%35%
1440
11th to 20thNight
16%7%26%6%45%6%5%8%35%
1440
21st to endNight
14%6%37%6%46%6%7%8%34%
1574
August1st to 10thNight
15%5%25%5%45%6%7%10%37%
1432
11th to 20thNight
15%7%36%7%45%6%5%8%33%
1589
21st to endNight
16%6%35%5%445%5%8%40%
1901
September1st to 10thNight
18%6%37%5%3445%7%40%
1800
11th to 20thNight
17%6%35%424446%45%
1955
21st to endNight
18%6%25%5%3445%7%42%
1980
October1st to 10thNight
19%8%35%5%35%5%45%38%
1984
11th to 20thNight
24%8%27%6%4445%5%30%
2304
21st to endNight
26%11%37%5%3445%5%27%
2574
November1st to 10thNight
19%12%48%5%34447%29%
2407
11th to 20thNight
19%12%6%9%6%34445%29%
2470
21st to endNight
21%17%6%9%6%34335%23%
2764
December1st to 10thNight
24%15%6%10%7%345%4419%
2850
11th to 20thNight
20%17%6%10%6%3444422%
3531
21st to endNight
25%20%47%43333324%
5067

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
71%5%8%11%4
1510
11th to 20thDay
67%49%14%5%2
1440
21st to endDay
57%6%10%18%9%1
1584
February1st to 10thDay
67%49%13%6%1
1442
11th to 20thDay
64%5%12%11%6%1
1756
21st to endDay
59%5%10%17%8%1
1480
March1st to 10thDay
57%6%9%16%11%2
1800
11th to 20thDay
56%5%11%16%11%1
1881
21st to endDay
55%5%12%16%10%2
2317
April1st to 10thDay
61%410%13%9%3
2160
11th to 20thDay
50%5%10%21%11%2
2209
21st to endDay
58%5%9%14%11%3
2340
May1st to 10thDay
52%5%10%17%13%2
2389
11th to 20thDay
48%8%11%20%12%1
2482
21st to endDay
52%7%11%17%12%1
2725
June1st to 10thDay
53%9%11%19%7%1
2675
11th to 20thDay
46%8%14%20%11%1
2700
21st to endDay
56%8%11%16%9%
2681
July1st to 10thDay
45%10%16%23%6%
2450
11th to 20thDay
45%10%17%21%7%
2445
21st to endDay
48%10%16%19%7%
2591
August1st to 10thDay
50%11%18%19%3
2481
11th to 20thDay
44%9%16%21%9%
2304
21st to endDay
44%8%13%25%9%
2452
September1st to 10thDay
44%7%15%23%10%1
2160
11th to 20thDay
40%5%16%27%11%
2004
21st to endDay
46%6%14%25%9%
1980
October1st to 10thDay
51%6%12%24%7%
1973
11th to 20thDay
60%8%15%15%2
1656
21st to endDay
65%6%8%16%41
1782
November1st to 10thDay
56%6%13%18%8%
1671
11th to 20thDay
63%5%10%15%6%
1710
21st to endDay
65%6%14%11%4
1411
December1st to 10thDay
69%5%11%11%4
1330
11th to 20thDay
65%49%16%6%
1668
21st to endDay
67%8%9%9%6%1
2590
January1st to 10thNight
71%5%8%12%41
2647
11th to 20thNight
67%6%9%13%6%1
2520
21st to endNight
59%6%9%16%9%1
2772
February1st to 10thNight
64%49%14%7%1
2516
11th to 20thNight
64%6%9%13%8%1
2100
21st to endNight
58%410%15%12%1
1776
March1st to 10thNight
59%5%10%16%9%2
2160
11th to 20thNight
58%6%9%13%12%2
2078
21st to endNight
53%5%9%17%11%3
2036
April1st to 10thNight
58%5%11%14%10%3
1800
11th to 20thNight
51%6%9%21%11%2
1699
21st to endNight
56%48%16%13%2
1620
May1st to 10thNight
54%6%10%14%13%2
1585
11th to 20thNight
51%5%10%17%15%2
1416
21st to endNight
49%6%10%18%16%1
1551
June1st to 10thNight
51%8%11%20%9%1
1281
11th to 20thNight
48%8%11%19%12%2
1260
21st to endNight
52%8%12%17%10%1
1274
July1st to 10thNight
44%10%17%20%9%
1400
11th to 20thNight
44%9%15%22%8%1
1392
21st to endNight
46%9%17%20%8%
1486
August1st to 10thNight
40%11%17%26%5%
1422
11th to 20thNight
46%10%18%20%6%
1589
21st to endNight
42%9%14%26%9%
1901
September1st to 10thNight
43%8%15%23%11%1
1800
11th to 20thNight
40%7%17%27%9%1
1955
21st to endNight
42%7%12%25%13%
1980
October1st to 10thNight
48%6%11%24%12%
1984
11th to 20thNight
55%7%13%20%5%
2304
21st to endNight
59%6%12%14%8%
2574
November1st to 10thNight
56%7%13%18%6%
2407
11th to 20thNight
59%6%13%14%8%
2470
21st to endNight
64%5%12%13%5%
2764
December1st to 10thNight
70%5%11%11%3
2850
11th to 20thNight
65%6%9%14%6%
3532
21st to endNight
67%48%15%5%1
5067

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
32%22%28%16%11
178
11th to 20thDay
26%27%33%9%5%
160
21st to endDay
22%24%32%17%5%1
176
February1st to 10thDay
27%30%35%6%21
162
11th to 20thDay
26%21%37%14%3
415
21st to endDay
25%24%32%16%3
346
March1st to 10thDay
28%20%30%17%4
420
11th to 20thDay
27%20%30%18%5%1
420
21st to endDay
24%20%29%17%8%2
462
April1st to 10thDay
31%18%28%17%6%
420
11th to 20thDay
30%18%27%18%6%1
412
21st to endDay
32%18%29%14%5%1
420
May1st to 10thDay
29%17%31%18%41
423
11th to 20thDay
22%13%33%21%9%1
447
21st to endDay
22%21%33%15%9%
485
June1st to 10thDay
23%14%32%23%7%1
605
11th to 20thDay
22%11%29%25%12%1
630
21st to endDay
26%11%26%24%12%1
611
July1st to 10thDay
16%11%32%27%12%2
445
11th to 20thDay
17%11%35%25%10%2
444
21st to endDay
18%8%33%29%10%2
488
August1st to 10thDay
19%11%26%28%12%4
446
11th to 20thDay
20%6%25%28%18%3
439
21st to endDay
23%15%25%18%14%6%
495
September1st to 10thDay
19%12%26%28%12%5%
450
11th to 20thDay
20%11%26%23%16%4
450
21st to endDay
22%14%24%23%14%4
450
October1st to 10thDay
25%13%26%23%10%2
450
11th to 20thDay
29%17%26%19%9%1
378
21st to endDay
36%15%26%20%4
396
November1st to 10thDay
32%15%30%16%6%1
365
11th to 20thDay
28%20%28%16%7%1
370
21st to endDay
35%17%30%15%2
189
December1st to 10thDay
33%16%27%18%6%1
180
11th to 20thDay
33%20%31%11%41
180
21st to endDay
36%22%27%12%3
198
January1st to 10thNight
28%17%34%17%3
760
11th to 20thNight
26%17%33%20%3
720
21st to endNight
17%14%36%28%5%
792
February1st to 10thNight
22%14%37%22%4
720
11th to 20thNight
24%18%38%17%3
703
21st to endNight
26%15%33%23%4
592
March1st to 10thNight
25%14%36%22%3
720
11th to 20thNight
28%14%33%18%6%1
720
21st to endNight
24%13%31%25%6%
792
April1st to 10thNight
31%14%30%21%5%
720
11th to 20thNight
27%11%34%23%5%
635
21st to endNight
31%13%28%22%6%
540
May1st to 10thNight
28%9%30%26%6%
505
11th to 20thNight
23%12%29%31%41
354
21st to endNight
23%10%31%30%6%
389
June1st to 10thNight
26%8%29%32%6%
360
11th to 20thNight
22%7%27%36%9%
360
21st to endNight
23%7%28%34%9%
360
July1st to 10thNight
17%6%34%35%9%
350
11th to 20thNight
17%5%25%40%12%1
348
21st to endNight
14%8%23%47%8%
394
August1st to 10thNight
17%422%40%17%1
358
11th to 20thNight
18%5%24%37%14%2
525
21st to endNight
17%7%28%31%15%1
713
September1st to 10thNight
20%6%28%32%13%1
720
11th to 20thNight
21%7%24%31%15%2
720
21st to endNight
21%8%28%28%14%1
720
October1st to 10thNight
23%9%26%32%8%1
720
11th to 20thNight
29%11%28%23%9%1
720
21st to endNight
33%12%32%18%4
792
November1st to 10thNight
27%15%28%23%6%
740
11th to 20thNight
26%17%29%19%9%1
760
21st to endNight
30%16%29%18%6%1
814
December1st to 10thNight
32%14%30%18%6%
850
11th to 20thNight
27%19%28%20%6%
850
21st to endNight
34%17%30%16%31
886
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