Pincourt
Clear Sky Chart
History

This sumarizes the distribution of each different forecast outcome for the Pincourt clear sky chart from 2005-11-06 to 2024-01-22.

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
30%
22594
9%
74848
5%
22558
35%
22558
9%
60731

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
16%
760
5%
2649
2%
757
20%
757
4%
2319
January11th to 20thNight
17%
760
4%
2660
2%
760
20%
760
5%
2332
January21st to endNight
23%
800
8%
2798
5%
800
28%
800
7%
2293
February1st to 10thNight
17%
720
6%
2358
2%
720
21%
720
6%
2010
February11th to 20thNight
22%
701
8%
2189
3%
700
28%
700
7%
1812
February21st to endNight
22%
592
10%
1776
4%
592
30%
592
8%
1496
March1st to 10thNight
22%
720
9%
2160
6%
720
26%
720
8%
1805
March11th to 20thNight
23%
720
9%
2080
4%
720
29%
720
9%
1729
March21st to endNight
29%
792
14%
1993
6%
792
34%
792
13%
1622
April1st to 10thNight
27%
720
11%
1800
3%
720
31%
720
12%
1492
April11th to 20thNight
28%
711
11%
1775
3%
711
33%
711
13%
1444
April21st to endNight
28%
590
12%
1670
6%
590
33%
590
12%
1340
May1st to 10thNight
31%
403
11%
1483
8%
403
37%
403
9%
1162
May11th to 20thNight
34%
354
14%
1416
11%
354
43%
354
10%
1068
May21st to endNight
38%
388
11%
1551
12%
388
44%
388
11%
1134
June1st to 10thNight
35%
360
5%
1440
5%
360
41%
360
8%
1151
June11th to 20thNight
42%
360
9%
1440
10%
360
48%
360
11%
1076
June21st to endNight
39%
360
8%
1440
9%
360
46%
360
9%
1110
July1st to 10thNight
52%
350
8%
1400
12%
350
56%
350
12%
1045
July11th to 20thNight
50%
348
9%
1392
12%
348
54%
348
11%
1026
July21st to endNight
53%
394
9%
1486
9%
372
56%
372
11%
1115
August1st to 10thNight
56%
358
10%
1422
10%
356
59%
356
13%
1024
August11th to 20thNight
52%
545
14%
1609
9%
545
55%
545
18%
1173
August21st to endNight
50%
792
10%
1980
4%
792
52%
792
17%
1575
September1st to 10thNight
49%
720
9%
1800
4%
720
51%
720
16%
1433
September11th to 20thNight
53%
720
13%
1866
8%
720
55%
720
18%
1435
September21st to endNight
44%
720
11%
1980
8%
720
47%
720
14%
1558
October1st to 10thNight
36%
720
11%
2111
7%
720
40%
720
11%
1699
October11th to 20thNight
31%
720
10%
2185
5%
720
38%
720
9%
1788
October21st to endNight
25%
792
8%
2574
5%
792
29%
792
9%
2098
November1st to 10thNight
26%
740
9%
2407
6%
740
30%
740
9%
1941
November11th to 20thNight
23%
760
12%
2550
8%
760
30%
760
9%
2063
November21st to endNight
19%
760
7%
2660
4%
760
23%
760
5%
2263
December1st to 10thNight
16%
760
3%
2660
1%
760
19%
760
4%
2362
December11th to 20thNight
16%
760
8%
3246
3%
759
21%
759
4%
2701
December21st to endNight
14%
824
3%
4842
1%
817
17%
817
2%
4037

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%8%36%6%35%5%5%7%34%
74827
Night
18%10%47%6%35%45%6%32%
75103
TransparencyDay
34%37%9%14%7%1
74532
Night
36%36%8%13%6%1
74932
SeeingDay
20%11%28%24%13%4
13478
Night
23%10%29%28%10%1
22609

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%17%6%9%7%35%5%4421%
1517
11th to 20thDay
19%15%6%9%6%3445%6%23%
1520
21st to endDay
11%13%49%7%5%6%5%6%7%26%
1592
February1st to 10thDay
15%14%5%10%8%46%5%45%24%
1598
11th to 20thDay
15%11%48%7%45%5%6%6%28%
1658
21st to endDay
18%14%5%9%6%35%5%45%27%
1480
March1st to 10thDay
15%12%5%8%7%45%5%46%30%
1797
11th to 20thDay
16%10%46%6%45%5%5%6%32%
1877
21st to endDay
19%8%27%5%3445%6%36%
2362
April1st to 10thDay
21%8%46%6%345%46%32%
2160
11th to 20thDay
19%7%45%5%345%5%6%37%
2134
21st to endDay
21%8%46%6%3445%5%33%
2290
May1st to 10thDay
19%6%37%6%45%5%5%6%36%
2492
11th to 20thDay
17%7%36%5%245%5%7%40%
2478
21st to endDay
16%7%35%6%45%5%6%8%37%
2725
June1st to 10thDay
20%7%36%5%35%5%6%7%31%
2520
11th to 20thDay
15%6%26%6%35%5%5%8%39%
2520
21st to endDay
18%6%36%6%35%5%6%8%32%
2520
July1st to 10thDay
11%5%35%5%35%5%6%8%43%
2520
11th to 20thDay
12%5%25%5%35%6%8%10%38%
2520
21st to endDay
12%435%5%36%6%6%10%39%
2744
August1st to 10thDay
12%6%26%6%35%6%7%9%39%
2506
11th to 20thDay
9%6%25%5%45%5%7%10%42%
2270
21st to endDay
12%5%25%5%346%7%8%42%
2376
September1st to 10thDay
12%6%35%5%346%5%8%43%
2160
11th to 20thDay
14%5%245%3345%7%49%
2093
21st to endDay
15%6%35%6%35%5%5%7%41%
1980
October1st to 10thDay
20%7%35%6%445%5%6%36%
1846
11th to 20thDay
18%8%47%7%46%6%5%6%29%
1774
21st to endDay
25%10%46%5%3446%6%27%
1782
November1st to 10thDay
17%9%46%5%3446%8%33%
1671
11th to 20thDay
17%10%47%7%45%5%6%7%28%
1627
21st to endDay
20%12%38%7%46%6%5%7%23%
1520
December1st to 10thDay
25%13%6%9%5%35%5%5%6%18%
1520
11th to 20thDay
21%13%5%8%6%35%6%6%5%23%
1906
21st to endDay
28%15%5%8%7%4434419%
2772
January1st to 10thNight
17%17%6%9%8%46%445%20%
2649
11th to 20thNight
17%16%5%9%7%45%445%22%
2660
21st to endNight
13%12%6%9%8%46%45%6%29%
2798
February1st to 10thNight
15%14%6%11%8%46%5%5%6%20%
2358
11th to 20thNight
15%10%49%7%45%5%6%6%28%
2187
21st to endNight
15%13%5%9%7%34435%31%
1776
March1st to 10thNight
17%13%5%8%8%35%45%6%28%
2150
11th to 20thNight
17%12%47%6%345%5%5%32%
2079
21st to endNight
19%10%36%5%34445%37%
1993
April1st to 10thNight
24%8%36%6%4445%7%30%
1800
11th to 20thNight
22%7%36%5%345%46%35%
1775
21st to endNight
21%9%46%6%34446%34%
1670
May1st to 10thNight
21%8%46%5%34447%34%
1483
11th to 20thNight
18%7%36%7%35%446%39%
1415
21st to endNight
15%437%435%45%7%41%
1550
June1st to 10thNight
20%7%37%5%346%5%8%30%
1440
11th to 20thNight
16%7%35%3345%6%7%40%
1440
21st to endNight
16%7%36%6%35%5%6%7%36%
1440
July1st to 10thNight
11%5%26%5%36%5%6%9%44%
1440
11th to 20thNight
11%425%6%36%6%7%9%40%
1440
21st to endNight
11%7%35%5%35%5%6%10%41%
1574
August1st to 10thNight
12%5%15%5%246%6%10%44%
1432
11th to 20thNight
11%7%25%6%3446%8%44%
1609
21st to endNight
13%5%36%5%25%5%6%8%42%
1980
September1st to 10thNight
12%6%36%6%345%5%7%43%
1800
11th to 20thNight
16%6%2442335%7%48%
1866
21st to endNight
17%6%245%45%5%5%7%41%
1980
October1st to 10thNight
18%7%36%6%45%5%5%6%36%
2111
11th to 20thNight
20%7%46%6%45%45%5%34%
2185
21st to endNight
24%7%47%7%5%435%6%29%
2574
November1st to 10thNight
19%9%47%5%345%5%7%32%
2407
11th to 20thNight
18%10%47%6%45%445%32%
2550
21st to endNight
22%11%5%8%7%45%45%425%
2660
December1st to 10thNight
21%15%6%9%6%35%5%5%5%20%
2660
11th to 20thNight
24%14%5%8%6%25%445%23%
3288
21st to endNight
30%15%5%9%5%3333421%
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
42%40%7%10%1
1518
11th to 20thDay
41%39%6%9%5%
1520
21st to endDay
38%37%10%9%6%
1592
February1st to 10thDay
41%36%8%11%31
1598
11th to 20thDay
38%37%10%10%31
1667
21st to endDay
42%35%8%11%4
1480
March1st to 10thDay
38%36%8%12%5%1
1800
11th to 20thDay
35%37%11%12%5%1
1877
21st to endDay
31%36%8%13%10%2
2362
April1st to 10thDay
36%36%5%14%7%1
2160
11th to 20thDay
31%36%6%14%12%1
2134
21st to endDay
36%36%6%12%8%3
2290
May1st to 10thDay
32%37%6%12%11%2
2492
11th to 20thDay
29%38%6%15%10%3
2482
21st to endDay
28%37%9%13%11%2
2725
June1st to 10thDay
34%38%8%12%7%
2520
11th to 20thDay
29%37%7%16%9%2
2520
21st to endDay
35%38%10%12%5%1
2520
July1st to 10thDay
26%39%9%19%8%
2450
11th to 20thDay
27%38%10%18%7%
2445
21st to endDay
26%40%12%16%6%
2591
August1st to 10thDay
30%37%11%17%5%
2492
11th to 20thDay
23%37%13%20%7%
2270
21st to endDay
26%37%11%16%9%1
2376
September1st to 10thDay
27%36%9%19%8%
2160
11th to 20thDay
26%36%8%19%10%
2093
21st to endDay
31%37%9%18%6%
1980
October1st to 10thDay
34%37%8%15%6%
1846
11th to 20thDay
38%37%9%11%5%
1774
21st to endDay
37%37%9%12%5%1
1782
November1st to 10thDay
28%40%10%15%6%
1671
11th to 20thDay
37%39%8%8%7%
1627
21st to endDay
39%40%9%10%1
1520
December1st to 10thDay
45%41%7%6%2
1520
11th to 20thDay
44%33%10%11%2
1906
21st to endDay
56%25%8%8%2
2772
January1st to 10thNight
43%40%7%8%2
2649
11th to 20thNight
43%40%6%8%3
2660
21st to endNight
38%37%8%10%6%1
2798
February1st to 10thNight
43%36%7%9%4
2358
11th to 20thNight
38%37%9%13%3
2189
21st to endNight
41%36%6%12%5%
1776
March1st to 10thNight
41%35%7%12%5%1
2160
11th to 20thNight
37%37%8%13%5%
2080
21st to endNight
32%37%6%14%9%3
1993
April1st to 10thNight
36%36%7%13%7%2
1800
11th to 20thNight
34%35%6%16%8%1
1775
21st to endNight
34%36%5%15%8%3
1670
May1st to 10thNight
35%35%311%11%5%
1483
11th to 20thNight
30%37%5%13%12%3
1416
21st to endNight
27%37%8%13%13%2
1551
June1st to 10thNight
35%38%9%12%6%1
1440
11th to 20thNight
29%37%9%15%9%2
1440
21st to endNight
32%38%9%14%8%
1440
July1st to 10thNight
26%39%9%17%8%
1400
11th to 20thNight
26%39%10%17%8%
1392
21st to endNight
26%40%10%15%8%
1486
August1st to 10thNight
26%36%13%18%7%
1422
11th to 20thNight
23%36%13%18%10%
1609
21st to endNight
28%37%11%16%7%1
1980
September1st to 10thNight
29%37%7%17%9%
1800
11th to 20thNight
26%36%8%20%9%
1866
21st to endNight
30%37%8%16%9%
1980
October1st to 10thNight
34%37%8%14%7%
2111
11th to 20thNight
37%36%9%14%5%
2185
21st to endNight
37%37%9%11%5%1
2574
November1st to 10thNight
32%41%8%13%6%
2407
11th to 20thNight
33%39%9%11%6%1
2550
21st to endNight
40%39%8%10%3
2660
December1st to 10thNight
45%39%7%7%1
2660
11th to 20thNight
45%32%7%13%3
3288
21st to endNight
56%24%9%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
27%12%29%24%7%1
180
11th to 20thDay
27%16%31%21%41
180
21st to endDay
20%12%38%21%8%1
178
February1st to 10thDay
29%20%37%13%2
230
11th to 20thDay
21%11%45%19%3
325
21st to endDay
28%12%29%29%2
346
March1st to 10thDay
22%13%35%23%7%
420
11th to 20thDay
18%17%35%20%8%1
420
21st to endDay
27%11%29%19%12%2
462
April1st to 10thDay
27%14%28%20%10%1
420
11th to 20thDay
24%16%26%21%11%4
412
21st to endDay
26%11%30%21%10%2
420
May1st to 10thDay
23%10%34%21%10%3
423
11th to 20thDay
17%10%33%23%13%4
447
21st to endDay
17%10%30%26%13%4
485
June1st to 10thDay
24%9%22%29%12%4
450
11th to 20thDay
15%10%26%28%19%2
450
21st to endDay
21%7%28%24%15%5%
450
July1st to 10thDay
12%7%25%28%21%7%
445
11th to 20thDay
14%6%26%30%19%5%
444
21st to endDay
12%7%24%34%18%5%
488
August1st to 10thDay
16%6%21%30%21%7%
446
11th to 20thDay
12%422%33%19%9%
439
21st to endDay
13%9%24%25%19%10%
495
September1st to 10thDay
12%9%26%26%19%9%
450
11th to 20thDay
15%8%22%23%20%12%
450
21st to endDay
15%8%29%24%19%6%
450
October1st to 10thDay
23%11%24%21%15%6%
450
11th to 20thDay
21%13%28%24%12%2
437
21st to endDay
32%11%26%23%8%
396
November1st to 10thDay
24%15%28%24%9%1
365
11th to 20thDay
26%19%29%17%7%1
287
21st to endDay
24%21%26%23%6%1
180
December1st to 10thDay
30%12%28%22%7%2
180
11th to 20thDay
24%16%38%18%31
180
21st to endDay
32%15%29%17%6%2
198
January1st to 10thNight
26%14%30%25%5%
760
11th to 20thNight
27%11%35%22%5%
760
21st to endNight
19%11%36%27%7%1
800
February1st to 10thNight
22%13%37%23%5%1
720
11th to 20thNight
20%13%36%26%4
703
21st to endNight
22%10%36%28%4
592
March1st to 10thNight
24%12%34%25%5%
720
11th to 20thNight
24%11%33%25%6%
720
21st to endNight
25%8%29%28%9%1
792
April1st to 10thNight
26%12%28%27%6%
720
11th to 20thNight
26%11%31%25%7%
711
21st to endNight
26%10%30%24%9%1
590
May1st to 10thNight
26%7%29%27%10%1
403
11th to 20thNight
19%7%32%32%10%1
354
21st to endNight
17%5%32%34%11%
389
June1st to 10thNight
23%6%28%32%9%1
360
11th to 20thNight
19%5%27%34%14%1
360
21st to endNight
17%7%29%29%19%1
360
July1st to 10thNight
12%425%39%19%1
350
11th to 20thNight
9%426%41%17%2
348
21st to endNight
12%424%43%16%2
394
August1st to 10thNight
15%317%44%21%1
358
11th to 20thNight
15%321%34%23%3
545
21st to endNight
16%224%35%20%2
792
September1st to 10thNight
14%5%25%37%18%2
720
11th to 20thNight
18%5%17%36%19%3
720
21st to endNight
18%7%26%29%18%2
720
October1st to 10thNight
21%8%27%28%15%1
720
11th to 20thNight
23%10%28%28%11%
720
21st to endNight
27%11%31%26%5%
792
November1st to 10thNight
24%15%29%24%8%
740
11th to 20thNight
25%14%32%19%9%1
760
21st to endNight
27%13%31%19%9%
760
December1st to 10thNight
31%13%30%21%4
760
11th to 20thNight
29%15%30%20%5%1
760
21st to endNight
34%12%30%19%4
836
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