Bearbower Sand Prairie Area
Clear Sky Chart
History

This sumarizes the distribution of each different forecast outcome for the Bearbower Sand Prairie Area clear sky chart from 2005-11-06 to 2024-11-12.

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
36%
25601
17%
96763
10%
25315
43%
25315
19%
62547

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
26%
942
8%
4405
5%
926
33%
926
11%
3336
January11th to 20thNight
23%
950
13%
4264
5%
930
28%
930
10%
3114
January21st to endNight
21%
1039
8%
4499
4%
1023
28%
1023
9%
3522
February1st to 10thNight
23%
950
14%
2470
4%
950
29%
950
20%
1814
February11th to 20thNight
28%
922
18%
2398
6%
919
35%
919
25%
1644
February21st to endNight
24%
628
17%
1884
5%
628
34%
628
20%
1280
March1st to 10thNight
24%
682
23%
3552
8%
669
33%
669
15%
2005
March11th to 20thNight
31%
566
25%
3418
12%
550
42%
550
15%
1612
March21st to endNight
22%
626
6%
3681
4%
605
31%
605
7%
2822
April1st to 10thNight
24%
570
18%
1900
10%
570
36%
570
20%
1258
April11th to 20thNight
27%
563
18%
1875
12%
563
39%
563
19%
1230
April21st to endNight
31%
570
17%
1860
11%
570
41%
570
22%
1210
May1st to 10thNight
33%
568
21%
2644
10%
559
41%
559
16%
1635
May11th to 20thNight
37%
550
17%
2437
10%
541
44%
541
19%
1405
May21st to endNight
42%
608
15%
2711
7%
593
49%
593
21%
1460
June1st to 10thNight
52%
570
18%
1520
8%
570
57%
570
36%
938
June11th to 20thNight
50%
570
18%
1520
9%
570
53%
570
35%
939
June21st to endNight
51%
570
19%
1520
10%
570
55%
570
35%
952
July1st to 10thNight
71%
544
15%
2405
11%
535
74%
535
24%
1446
July11th to 20thNight
67%
535
19%
2201
14%
533
71%
533
35%
1069
July21st to endNight
64%
609
16%
2617
18%
569
67%
569
26%
1460
August1st to 10thNight
68%
554
23%
2579
22%
544
72%
544
28%
1294
August11th to 20thNight
65%
550
18%
2580
25%
543
70%
543
24%
1397
August21st to endNight
64%
609
19%
3125
26%
605
68%
605
23%
1687
September1st to 10thNight
58%
570
25%
1900
24%
570
64%
570
33%
1057
September11th to 20thNight
59%
570
29%
1900
27%
570
64%
570
34%
1065
September21st to endNight
49%
694
25%
2152
17%
694
58%
694
36%
1198
October1st to 10thNight
45%
760
21%
2373
15%
740
50%
740
30%
1484
October11th to 20thNight
33%
760
19%
2513
11%
740
42%
740
23%
1599
October21st to endNight
31%
836
13%
3388
10%
814
39%
814
14%
2505
November1st to 10thNight
33%
780
25%
2536
15%
780
46%
780
28%
1490
November11th to 20thNight
25%
898
19%
2617
8%
898
34%
898
22%
1747
November21st to endNight
27%
950
18%
2660
8%
950
36%
950
23%
1801
December1st to 10thNight
22%
950
12%
2660
4%
950
30%
950
19%
1915
December11th to 20thNight
26%
949
14%
3166
5%
948
32%
948
15%
2242
December21st to endNight
18%
1039
9%
4833
4%
1026
28%
1026
8%
3915

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
13%8%38%5%4445%7%38%
101562
Night
13%9%38%5%4435%6%40%
97710
TransparencyDay
44%6%12%23%13%1
105170
Night
43%5%11%23%15%2
102242
SeeingDay
16%10%30%26%14%4
15899
Night
16%9%32%31%11%1
25740

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
8%13%8%19%7%7%6%345%21%
2527
11th to 20thDay
10%12%411%9%8%6%5%7%6%23%
2608
21st to endDay
14%18%6%16%6%5%435%6%16%
3135
February1st to 10thDay
11%12%5%10%6%6%445%7%29%
1710
11th to 20thDay
12%11%46%5%5%6%45%6%34%
1668
21st to endDay
14%10%49%5%445%5%6%33%
1570
March1st to 10thDay
16%10%38%5%33345%41%
3278
11th to 20thDay
10%7%26%5%5%445%8%43%
3480
21st to endDay
22%14%5%11%5%45%35%6%20%
3931
April1st to 10thDay
19%12%37%44445%6%32%
2280
11th to 20thDay
16%12%38%5%45%35%6%33%
2254
21st to endDay
23%8%36%44335%6%34%
2316
May1st to 10thDay
20%7%27%5%5%5%46%7%33%
4234
11th to 20thDay
16%7%26%44445%7%42%
4399
21st to endDay
16%6%26%5%4446%8%40%
4824
June1st to 10thDay
12%5%25%45%5%47%8%44%
2660
11th to 20thDay
11%6%36%33446%7%45%
2660
21st to endDay
12%6%36%5%5%45%6%9%40%
2660
July1st to 10thDay
11%7%38%5%5%5%47%9%36%
4440
11th to 20thDay
5%415%34446%9%55%
4440
21st to endDay
6%5%26%5%5%5%5%8%10%44%
4698
August1st to 10thDay
8%5%27%445%5%7%8%44%
4104
11th to 20thDay
12%5%26%445%47%10%40%
3993
21st to endDay
8%426%44436%9%49%
4180
September1st to 10thDay
14%416%33425%7%49%
2280
11th to 20thDay
11%5%25%444447%50%
2280
21st to endDay
11%5%26%5%4445%7%47%
2003
October1st to 10thDay
15%6%26%44335%6%46%
1900
11th to 20thDay
18%8%25%444346%42%
1900
21st to endDay
16%10%27%434345%41%
2063
November1st to 10thDay
12%7%26%5%45%347%44%
1762
11th to 20thDay
13%11%6%8%44445%7%35%
1584
21st to endDay
16%10%28%44335%6%38%
1520
December1st to 10thDay
13%12%5%12%5%5%4346%31%
1520
11th to 20thDay
14%11%49%7%6%436%7%30%
1918
21st to endDay
22%19%8%13%43424416%
2783
January1st to 10thNight
10%13%8%17%6%5%4345%25%
4428
11th to 20thNight
12%15%5%13%7%4448%6%22%
4345
21st to endNight
16%15%6%14%6%5%4346%22%
4532
February1st to 10thNight
11%12%5%9%7%5%4345%34%
2470
11th to 20thNight
11%10%38%5%5%435%7%40%
2397
21st to endNight
13%11%38%5%5%5%346%38%
1884
March1st to 10thNight
16%8%37%433235%45%
3605
11th to 20thNight
11%6%25%44335%7%50%
3480
21st to endNight
26%11%412%5%4334424%
3700
April1st to 10thNight
15%10%37%5%4335%5%40%
1900
11th to 20thNight
16%9%26%445%446%39%
1875
21st to endNight
18%7%26%44436%6%39%
1860
May1st to 10thNight
18%8%25%44445%6%39%
2668
11th to 20thNight
12%7%37%44435%6%45%
2506
21st to endNight
10%7%25%44445%7%46%
2743
June1st to 10thNight
8%5%26%4445%7%7%48%
1520
11th to 20thNight
8%5%25%45%35%8%9%45%
1520
21st to endNight
12%425%34337%8%47%
1520
July1st to 10thNight
10%6%36%445%47%9%43%
2530
11th to 20thNight
422433445%9%60%
2530
21st to endNight
6%426%445%46%9%50%
2862
August1st to 10thNight
6%315%34447%9%53%
2836
11th to 20thNight
9%5%25%44335%7%53%
2842
21st to endNight
9%5%25%43435%6%53%
3476
September1st to 10thNight
10%425%43335%5%55%
1900
11th to 20thNight
12%425%344347%53%
1900
21st to endNight
9%5%1433435%6%56%
2152
October1st to 10thNight
12%6%25%433346%53%
2280
11th to 20thNight
15%6%26%434346%47%
2280
21st to endNight
17%9%26%5%44345%40%
2533
November1st to 10thNight
12%7%25%434346%50%
2536
11th to 20thNight
13%10%47%5%3435%7%38%
2617
21st to endNight
16%10%27%444346%41%
2660
December1st to 10thNight
13%10%410%6%4445%6%33%
2660
11th to 20thNight
14%12%49%6%45%35%6%33%
3279
21st to endNight
21%16%6%12%5%5%4345%19%
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
66%6%10%11%6%
2528
11th to 20thDay
59%413%15%8%
2608
21st to endDay
69%411%11%4
3135
February1st to 10thDay
54%5%13%18%9%1
1710
11th to 20thDay
49%6%12%23%9%1
1677
21st to endDay
50%6%13%20%9%3
1570
March1st to 10thDay
46%5%10%24%13%2
3278
11th to 20thDay
39%6%12%29%14%1
3480
21st to endDay
64%6%12%13%41
3931
April1st to 10thDay
53%5%11%22%8%
2280
11th to 20thDay
50%6%10%21%12%1
2254
21st to endDay
50%5%11%20%12%2
2316
May1st to 10thDay
49%7%12%18%13%1
4272
11th to 20thDay
41%7%12%28%12%
4403
21st to endDay
40%8%11%23%16%1
4837
June1st to 10thDay
35%9%14%24%16%2
2660
11th to 20thDay
36%7%12%22%21%3
2660
21st to endDay
40%8%13%23%13%2
2660
July1st to 10thDay
43%7%13%27%9%1
4371
11th to 20thDay
27%7%15%32%18%2
4365
21st to endDay
33%11%18%20%18%2
4550
August1st to 10thDay
35%8%15%27%13%2
4090
11th to 20thDay
38%7%16%24%14%1
4032
21st to endDay
32%6%14%30%17%2
4179
September1st to 10thDay
34%5%12%25%21%3
2280
11th to 20thDay
33%6%12%31%17%1
2280
21st to endDay
36%5%10%30%17%1
2003
October1st to 10thDay
23%46%33%33%1
3160
11th to 20thDay
31%211%28%24%5%
3140
21st to endDay
41%410%29%14%3
3377
November1st to 10thDay
40%5%13%26%13%3
1762
11th to 20thDay
49%5%15%19%12%1
1584
21st to endDay
47%6%16%23%9%
1520
December1st to 10thDay
55%6%12%18%8%2
1520
11th to 20thDay
53%5%17%16%9%1
1915
21st to endDay
72%410%9%4
2783
January1st to 10thNight
60%5%12%15%8%1
4428
11th to 20thNight
60%312%15%9%
4345
21st to endNight
65%5%10%14%5%1
4532
February1st to 10thNight
52%410%21%12%1
2470
11th to 20thNight
44%5%12%25%13%2
2398
21st to endNight
48%412%20%14%2
1884
March1st to 10thNight
43%410%26%16%2
3605
11th to 20thNight
34%5%11%32%17%2
3480
21st to endNight
65%5%11%13%5%1
3700
April1st to 10thNight
46%49%25%13%2
1900
11th to 20thNight
46%5%8%21%16%3
1875
21st to endNight
44%5%11%24%14%2
1860
May1st to 10thNight
44%6%11%16%21%2
2695
11th to 20thNight
39%6%10%28%14%3
2507
21st to endNight
34%7%12%27%18%2
2751
June1st to 10thNight
31%8%16%26%16%3
1520
11th to 20thNight
32%8%13%23%20%4
1520
21st to endNight
33%7%15%26%15%4
1520
July1st to 10thNight
37%6%15%27%12%2
2490
11th to 20thNight
21%6%17%36%17%2
2482
21st to endNight
30%9%16%23%20%2
2771
August1st to 10thNight
27%6%17%33%16%2
2826
11th to 20thNight
30%6%14%35%14%1
2869
21st to endNight
31%6%12%27%19%5%
3476
September1st to 10thNight
31%6%9%26%26%2
1900
11th to 20thNight
32%5%9%32%20%2
1900
21st to endNight
29%6%10%30%23%2
2152
October1st to 10thNight
23%36%29%36%3
3800
11th to 20thNight
28%310%23%30%6%
3779
21st to endNight
47%48%23%15%3
4169
November1st to 10thNight
36%413%25%18%3
2536
11th to 20thNight
46%412%24%12%1
2617
21st to endNight
46%412%26%11%1
2660
December1st to 10thNight
51%5%12%22%8%1
2660
11th to 20thNight
52%5%13%23%6%1
3281
21st to endNight
68%5%8%13%6%
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
18%13%34%25%8%2
270
11th to 20thDay
17%13%43%21%4
270
21st to endDay
20%15%33%26%5%1
297
February1st to 10thDay
16%20%38%22%4
270
11th to 20thDay
19%19%32%22%7%
270
21st to endDay
20%15%43%17%5%
225
March1st to 10thDay
15%19%41%19%5%1
270
11th to 20thDay
20%16%33%21%8%2
270
21st to endDay
31%16%30%16%6%1
363
April1st to 10thDay
25%14%39%17%5%
460
11th to 20thDay
24%18%28%21%8%1
452
21st to endDay
25%14%34%16%9%2
496
May1st to 10thDay
23%13%32%23%8%1
653
11th to 20thDay
20%13%27%25%12%3
675
21st to endDay
16%11%29%25%15%4
734
June1st to 10thDay
10%5%29%31%20%5%
680
11th to 20thDay
13%6%29%33%17%3
680
21st to endDay
11%8%33%31%13%4
680
July1st to 10thDay
9%318%35%22%13%
671
11th to 20thDay
8%326%31%24%8%
668
21st to endDay
6%324%36%26%4
739
August1st to 10thDay
7%424%32%27%8%
676
11th to 20thDay
12%5%20%31%23%10%
643
21st to endDay
8%422%34%24%8%
539
September1st to 10thDay
15%5%22%31%21%6%
490
11th to 20thDay
9%423%36%21%7%
490
21st to endDay
13%11%29%27%17%3
358
October1st to 10thDay
18%9%29%25%15%4
300
11th to 20thDay
25%18%32%16%8%1
300
21st to endDay
21%18%36%18%5%2
330
November1st to 10thDay
17%11%38%23%9%3
300
11th to 20thDay
16%23%27%26%8%1
273
21st to endDay
26%11%35%23%5%
270
December1st to 10thDay
13%13%43%22%7%2
270
11th to 20thDay
18%13%35%23%9%1
270
21st to endDay
26%19%37%16%2
297
January1st to 10thNight
14%14%37%27%7%
950
11th to 20thNight
16%14%36%28%6%
950
21st to endNight
19%12%34%29%5%
1045
February1st to 10thNight
17%12%38%27%6%
950
11th to 20thNight
16%12%38%28%6%
923
21st to endNight
18%13%39%25%41
628
March1st to 10thNight
20%13%37%24%6%1
684
11th to 20thNight
17%10%35%28%9%1
570
21st to endNight
24%11%36%22%6%1
627
April1st to 10thNight
20%12%41%24%3
570
11th to 20thNight
20%13%35%25%6%
563
21st to endNight
20%10%35%26%8%1
570
May1st to 10thNight
18%10%34%31%7%1
570
11th to 20thNight
17%9%30%34%10%1
561
21st to endNight
15%5%31%33%15%2
617
June1st to 10thNight
9%5%28%42%15%1
570
11th to 20thNight
10%332%42%13%1
570
21st to endNight
12%428%39%15%1
570
July1st to 10thNight
6%115%44%30%3
555
11th to 20thNight
5%219%44%27%3
552
21st to endNight
7%120%48%22%2
624
August1st to 10thNight
6%215%48%27%2
567
11th to 20thNight
9%316%43%25%4
564
21st to endNight
10%217%43%24%3
627
September1st to 10thNight
11%420%40%21%4
570
11th to 20thNight
12%321%37%25%2
570
21st to endNight
10%7%29%35%18%1
694
October1st to 10thNight
15%6%29%35%14%1
760
11th to 20thNight
18%11%34%29%8%
760
21st to endNight
21%11%31%28%8%
836
November1st to 10thNight
16%9%38%28%8%
780
11th to 20thNight
17%13%40%23%7%
898
21st to endNight
20%11%37%24%8%
950
December1st to 10thNight
17%13%39%25%6%1
950
11th to 20thNight
22%9%35%27%6%
950
21st to endNight
26%12%35%23%4
1045
Page generated at 2024-11-08 21:45:40. Version ac07

Copyright © 2024 Attilla Danko.


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