Estevan Point
Clear Sky Chart
History

This sumarizes the distribution of each different forecast outcome for the Estevan Point clear sky chart from 2005-11-06 to 2024-02-05.

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
34%
22902
9%
80861
7%
22760
36%
22760
11%
63390

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%
848
7%
4708
7%
816
19%
816
3%
4031
January11th to 20thNight
21%
842
15%
4629
5%
820
22%
820
4%
3312
January21st to endNight
23%
934
3%
4921
4%
902
26%
902
3%
4504
February1st to 10thNight
22%
752
9%
2429
5%
752
27%
752
8%
2036
February11th to 20thNight
31%
701
10%
2274
8%
700
34%
700
12%
1771
February21st to endNight
26%
592
9%
1887
7%
592
28%
592
10%
1481
March1st to 10thNight
26%
720
7%
2093
4%
720
29%
720
10%
1721
March11th to 20thNight
25%
720
8%
1980
5%
720
27%
720
9%
1693
March21st to endNight
25%
792
7%
2178
5%
792
26%
792
10%
1833
April1st to 10thNight
30%
635
7%
1779
4%
635
32%
635
11%
1436
April11th to 20thNight
31%
533
10%
1601
7%
533
33%
533
12%
1284
April21st to endNight
32%
540
11%
1620
8%
540
36%
540
13%
1258
May1st to 10thNight
45%
454
11%
1534
14%
454
47%
454
17%
1060
May11th to 20thNight
45%
354
9%
1344
12%
354
48%
354
12%
994
May21st to endNight
47%
389
8%
1358
8%
388
50%
388
18%
945
June1st to 10thNight
43%
360
2%
1260
2%
360
44%
360
12%
946
June11th to 20thNight
40%
360
2%
1260
1%
360
40%
360
14%
934
June21st to endNight
50%
360
5%
1260
2%
360
52%
360
16%
887
July1st to 10thNight
52%
350
4%
1225
3%
350
53%
350
19%
827
July11th to 20thNight
61%
348
11%
1218
11%
348
63%
348
27%
715
July21st to endNight
66%
411
12%
1319
15%
389
68%
389
31%
761
August1st to 10thNight
59%
537
13%
1553
14%
534
60%
534
25%
1023
August11th to 20thNight
66%
534
18%
1602
18%
534
67%
534
33%
942
August21st to endNight
49%
594
14%
1782
11%
594
52%
594
21%
1220
September1st to 10thNight
55%
649
16%
1729
10%
649
57%
649
27%
1182
September11th to 20thNight
47%
720
16%
1975
11%
720
49%
720
22%
1421
September21st to endNight
44%
720
15%
1980
11%
720
47%
720
22%
1413
October1st to 10thNight
39%
720
10%
2127
8%
720
41%
720
19%
1535
October11th to 20thNight
34%
720
7%
2160
6%
720
36%
720
12%
1729
October21st to endNight
28%
792
10%
2571
6%
792
34%
792
10%
2026
November1st to 10thNight
20%
740
6%
2560
4%
740
23%
740
6%
2154
November11th to 20thNight
20%
760
6%
2660
5%
760
22%
760
6%
2229
November21st to endNight
25%
788
7%
2718
4%
788
28%
788
9%
2194
December1st to 10thNight
29%
850
9%
2850
6%
850
32%
850
10%
2258
December11th to 20thNight
23%
850
4%
3516
3%
849
25%
849
6%
3053
December21st to endNight
19%
933
5%
5201
4%
905
24%
905
4%
4582

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
29%9%36%5%34446%27%
77693
Night
34%10%36%5%33345%24%
81125
TransparencyDay
59%8%12%14%6%1
77396
Night
63%6%10%13%7%1
81003
SeeingDay
29%8%19%23%16%5%
14846
Night
37%6%14%20%17%6%
22918

By Month

Percentage Cloud Cover NW (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
45%13%36%423345%12%
2219
11th to 20thDay
34%11%46%5%33446%20%
2199
21st to endDay
54%12%35%4233229%
2740
February1st to 10thDay
43%9%36%43435%5%16%
1623
11th to 20thDay
34%11%36%423435%25%
1575
21st to endDay
32%11%25%6%43447%23%
1368
March1st to 10thDay
34%13%46%6%3434420%
1867
11th to 20thDay
38%12%48%5%2343317%
1980
21st to endDay
37%10%48%42333322%
2178
April1st to 10thDay
33%11%37%6%34445%20%
2178
11th to 20thDay
30%11%35%5%24446%26%
2308
21st to endDay
32%9%26%434446%26%
2340
May1st to 10thDay
25%8%35%5%34447%32%
2425
11th to 20thDay
23%10%37%6%45%46%7%25%
2549
21st to endDay
21%9%47%5%35%5%5%8%28%
2917
June1st to 10thDay
28%9%36%5%25%45%6%26%
2700
11th to 20thDay
21%9%47%6%45%5%6%6%27%
2700
21st to endDay
24%8%36%5%3445%6%32%
2700
July1st to 10thDay
19%8%46%7%44447%34%
2700
11th to 20thDay
14%7%35%4345%5%8%41%
2700
21st to endDay
12%6%36%5%35%45%7%44%
2919
August1st to 10thDay
14%7%36%6%35%45%8%39%
2378
11th to 20thDay
11%7%45%5%2345%7%47%
2298
21st to endDay
19%7%25%5%35%46%8%36%
2574
September1st to 10thDay
19%6%35%4235%48%40%
2230
11th to 20thDay
23%8%35%5%45%45%6%33%
1982
21st to endDay
24%7%25%6%33446%35%
1980
October1st to 10thDay
25%7%27%6%35%6%6%6%29%
1832
11th to 20thDay
35%9%46%6%44446%20%
1800
21st to endDay
33%10%36%5%345%3425%
1782
November1st to 10thDay
41%9%36%5%33445%18%
1516
11th to 20thDay
41%10%45%6%3333319%
1520
21st to endDay
40%8%47%5%2335%419%
1459
December1st to 10thDay
29%12%48%5%34445%21%
1330
11th to 20thDay
43%13%46%5%2333316%
1685
21st to endDay
50%11%37%43333310%
2442
January1st to 10thNight
42%16%47%5%2322313%
4726
11th to 20thNight
37%8%35%5%24336%25%
4699
21st to endNight
59%11%35%4232229%
4921
February1st to 10thNight
40%11%35%5%24345%17%
2429
11th to 20thNight
32%11%36%5%2334427%
2272
21st to endNight
33%11%46%5%3433423%
1887
March1st to 10thNight
32%12%47%5%3345%5%20%
2093
11th to 20thNight
35%13%5%8%5%3434318%
1979
21st to endNight
38%11%46%5%3333419%
2178
April1st to 10thNight
33%13%35%433345%22%
1779
11th to 20thNight
33%10%47%5%34345%22%
1601
21st to endNight
29%10%36%6%3434427%
1620
May1st to 10thNight
26%7%25%423447%35%
1534
11th to 20thNight
20%9%38%6%45%6%5%6%27%
1344
21st to endNight
22%9%46%44345%7%34%
1358
June1st to 10thNight
26%9%48%5%3445%6%26%
1260
11th to 20thNight
23%10%37%6%245%5%6%29%
1260
21st to endNight
19%9%46%45%445%7%33%
1260
July1st to 10thNight
17%8%35%6%345%5%6%39%
1260
11th to 20thNight
13%7%25%43335%8%47%
1260
21st to endNight
10%7%36%5%23447%49%
1396
August1st to 10thNight
13%7%36%5%345%5%8%42%
1561
11th to 20thNight
8%6%46%4325%5%6%50%
1602
21st to endNight
17%9%35%5%345%5%6%37%
1782
September1st to 10thNight
15%7%36%5%24447%42%
1729
11th to 20thNight
23%10%35%323335%38%
1975
21st to endNight
28%6%24423336%38%
1980
October1st to 10thNight
28%7%35%422345%36%
2127
11th to 20thNight
34%8%36%6%345%45%23%
2160
21st to endNight
34%8%46%5%24445%23%
2571
November1st to 10thNight
41%10%36%5%4434416%
2560
11th to 20thNight
38%11%5%8%7%3322318%
2660
21st to endNight
42%7%35%43333322%
2718
December1st to 10thNight
32%11%47%6%3434424%
2850
11th to 20thNight
44%13%46%43233315%
3520
21st to endNight
49%12%36%42233313%
5214

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
75%5%6%9%41
2219
11th to 20thDay
66%5%7%13%8%2
2220
21st to endDay
84%45%5%2
2740
February1st to 10thDay
71%7%8%8%43
1623
11th to 20thDay
64%5%10%11%9%1
1584
21st to endDay
62%7%10%12%7%3
1368
March1st to 10thDay
67%6%11%12%4
1867
11th to 20thDay
72%5%9%7%5%2
1980
21st to endDay
69%7%9%11%31
2178
April1st to 10thDay
66%8%11%9%6%
2178
11th to 20thDay
62%7%9%14%7%
2308
21st to endDay
61%8%10%15%6%1
2340
May1st to 10thDay
53%9%14%18%6%
2425
11th to 20thDay
57%10%13%14%6%
2552
21st to endDay
54%10%15%15%5%
2918
June1st to 10thDay
57%10%15%12%5%1
2700
11th to 20thDay
56%13%12%14%5%
2700
21st to endDay
52%9%14%17%6%1
2700
July1st to 10thDay
49%10%16%14%9%1
2626
11th to 20thDay
40%11%21%21%7%
2619
21st to endDay
36%9%23%24%8%1
2757
August1st to 10thDay
42%10%19%19%8%2
2361
11th to 20thDay
36%9%20%20%11%3
2298
21st to endDay
43%12%19%20%6%
2574
September1st to 10thDay
41%10%15%23%8%3
2230
11th to 20thDay
51%9%13%14%12%1
1982
21st to endDay
48%9%14%18%8%3
1980
October1st to 10thDay
52%9%14%14%9%2
1832
11th to 20thDay
66%7%11%11%5%
1800
21st to endDay
63%7%9%12%7%1
1782
November1st to 10thDay
71%7%9%7%5%1
1516
11th to 20thDay
71%5%7%8%8%1
1520
21st to endDay
68%6%8%10%5%2
1459
December1st to 10thDay
65%8%9%9%7%2
1330
11th to 20thDay
74%6%8%6%42
1688
21st to endDay
79%5%6%6%31
2442
January1st to 10thNight
77%5%6%7%41
4726
11th to 20thNight
62%49%13%9%2
4740
21st to endNight
84%345%31
4921
February1st to 10thNight
70%6%7%9%6%2
2429
11th to 20thNight
63%5%10%12%9%1
2274
21st to endNight
65%412%12%6%2
1887
March1st to 10thNight
67%6%10%12%5%
2093
11th to 20thNight
71%6%7%10%5%2
1980
21st to endNight
70%5%9%11%5%1
2178
April1st to 10thNight
64%6%11%13%6%
1779
11th to 20thNight
65%6%8%14%8%1
1601
21st to endNight
61%5%9%16%8%1
1620
May1st to 10thNight
50%6%16%20%8%
1534
11th to 20thNight
57%8%12%18%5%1
1344
21st to endNight
49%8%17%21%5%
1358
June1st to 10thNight
58%7%15%13%42
1260
11th to 20thNight
54%10%14%17%5%
1260
21st to endNight
50%8%17%15%8%1
1260
July1st to 10thNight
45%9%15%17%11%2
1225
11th to 20thNight
33%9%22%24%10%1
1218
21st to endNight
31%8%24%25%10%2
1319
August1st to 10thNight
39%10%17%23%10%1
1553
11th to 20thNight
33%6%23%21%13%4
1602
21st to endNight
44%10%16%24%6%
1782
September1st to 10thNight
41%9%15%24%10%2
1729
11th to 20thNight
50%6%11%17%15%2
1975
21st to endNight
49%6%13%20%9%2
1980
October1st to 10thNight
52%6%12%17%12%1
2127
11th to 20thNight
64%6%12%11%6%
2160
21st to endNight
63%6%11%12%7%1
2571
November1st to 10thNight
72%6%8%9%41
2560
11th to 20thNight
73%47%7%6%1
2660
21st to endNight
67%6%8%11%6%3
2718
December1st to 10thNight
65%6%9%12%6%2
2850
11th to 20thNight
76%5%6%7%42
3516
21st to endNight
77%6%6%6%41
5214

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
49%12%15%15%7%2
180
11th to 20thDay
52%11%12%17%6%3
180
21st to endDay
45%11%13%17%11%3
379
February1st to 10thDay
48%8%19%17%7%1
353
11th to 20thDay
40%10%21%17%10%2
335
21st to endDay
37%10%26%18%8%2
280
March1st to 10thDay
38%9%20%18%14%2
370
11th to 20thDay
38%11%20%20%9%3
420
21st to endDay
43%6%22%17%9%3
462
April1st to 10thDay
37%13%22%17%8%3
420
11th to 20thDay
32%9%19%20%15%4
412
21st to endDay
36%13%23%15%10%4
420
May1st to 10thDay
26%9%19%26%17%3
423
11th to 20thDay
24%5%22%25%19%5%
518
21st to endDay
18%9%26%28%15%4
680
June1st to 10thDay
32%7%20%27%13%2
630
11th to 20thDay
22%10%25%24%16%2
630
21st to endDay
21%5%21%23%26%4
630
July1st to 10thDay
21%418%31%23%4
621
11th to 20thDay
14%420%34%22%6%
618
21st to endDay
11%215%32%31%8%
684
August1st to 10thDay
17%416%24%30%10%
497
11th to 20thDay
12%316%30%30%9%
437
21st to endDay
20%6%20%27%19%8%
495
September1st to 10thDay
24%5%16%28%20%7%
450
11th to 20thDay
32%5%15%18%20%10%
450
21st to endDay
27%8%17%24%18%6%
450
October1st to 10thDay
29%6%18%22%18%7%
450
11th to 20thDay
38%9%18%16%11%7%
450
21st to endDay
37%11%17%19%10%5%
396
November1st to 10thDay
38%10%18%19%13%2
208
11th to 20thDay
42%11%19%8%11%9%
180
21st to endDay
46%11%18%10%9%7%
180
December1st to 10thDay
40%11%17%17%8%7%
180
11th to 20thDay
41%7%22%16%11%3
180
21st to endDay
50%10%15%17%7%2
198
January1st to 10thNight
54%10%15%13%6%3
850
11th to 20thNight
49%8%13%17%12%2
850
21st to endNight
49%7%13%15%13%3
935
February1st to 10thNight
45%7%18%20%8%1
752
11th to 20thNight
38%7%16%25%12%1
704
21st to endNight
40%9%17%23%7%3
592
March1st to 10thNight
38%10%17%16%16%4
720
11th to 20thNight
42%10%16%19%12%2
720
21st to endNight
44%8%13%17%13%4
792
April1st to 10thNight
39%9%13%21%14%4
635
11th to 20thNight
39%5%15%24%14%3
533
21st to endNight
34%7%16%25%15%3
540
May1st to 10thNight
28%313%26%23%7%
454
11th to 20thNight
24%315%23%28%7%
354
21st to endNight
25%314%26%26%6%
389
June1st to 10thNight
30%410%25%26%5%
360
11th to 20thNight
24%418%25%24%5%
360
21st to endNight
21%312%26%30%9%
360
July1st to 10thNight
22%211%21%31%13%
350
11th to 20thNight
14%211%22%39%11%
348
21st to endNight
12%18%25%34%20%
411
August1st to 10thNight
17%27%20%32%23%
537
11th to 20thNight
13%17%21%40%18%
534
21st to endNight
23%212%24%29%10%
594
September1st to 10thNight
18%311%23%32%14%
649
11th to 20thNight
28%5%11%18%23%16%
720
21st to endNight
33%414%21%22%7%
720
October1st to 10thNight
33%314%21%21%8%
720
11th to 20thNight
39%5%13%18%17%8%
720
21st to endNight
41%9%16%20%11%4
792
November1st to 10thNight
47%8%19%17%8%1
740
11th to 20thNight
44%10%17%18%7%4
760
21st to endNight
45%7%17%18%9%5%
788
December1st to 10thNight
38%8%17%19%15%3
850
11th to 20thNight
47%8%15%19%9%1
850
21st to endNight
50%9%18%19%5%1
935
Page generated at 2024-02-02 02:20:28. Version ac07

Copyright 2024 Attilla Danko


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