Lake Lakota
Clear Sky Chart
History

This sumarizes the distribution of each different forecast outcome for the Lake Lakota clear sky chart from 2005-11-06 to 2024-02-20.

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
38%
24919
13%
80168
7%
24831
43%
24831
14%
59869

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
31%
938
7%
4482
4%
926
36%
926
6%
3683
January11th to 20thNight
29%
947
14%
4082
5%
930
32%
930
7%
3008
January21st to endNight
25%
1030
7%
4492
3%
1023
30%
1023
7%
3475
February1st to 10thNight
27%
950
10%
2470
3%
950
31%
950
14%
1959
February11th to 20thNight
29%
927
12%
2398
4%
923
33%
923
17%
1848
February21st to endNight
32%
595
12%
1779
4%
595
39%
595
13%
1382
March1st to 10thNight
32%
608
11%
2048
7%
608
36%
608
12%
1548
March11th to 20thNight
31%
540
13%
1980
9%
540
37%
540
12%
1489
March21st to endNight
29%
594
9%
2178
7%
594
34%
594
9%
1724
April1st to 10thNight
28%
540
10%
1925
7%
540
35%
540
12%
1428
April11th to 20thNight
28%
533
16%
1604
9%
533
38%
533
12%
1231
April21st to endNight
32%
540
13%
1620
9%
540
40%
540
13%
1249
May1st to 10thNight
35%
540
11%
1620
6%
540
42%
540
15%
1215
May11th to 20thNight
39%
531
15%
1594
8%
531
45%
531
15%
1194
May21st to endNight
38%
583
9%
1565
3%
582
41%
582
15%
1231
June1st to 10thNight
54%
540
13%
1391
5%
540
56%
540
21%
1023
June11th to 20thNight
48%
540
17%
1260
5%
540
52%
540
26%
913
June21st to endNight
57%
540
15%
1260
5%
540
59%
540
27%
921
July1st to 10thNight
67%
525
14%
1227
6%
525
67%
525
26%
913
July11th to 20thNight
65%
522
17%
1464
9%
522
68%
522
26%
994
July21st to endNight
67%
591
15%
1673
11%
558
68%
558
23%
1127
August1st to 10thNight
61%
537
15%
1601
12%
534
64%
534
20%
1149
August11th to 20thNight
62%
534
20%
1600
19%
534
68%
534
24%
1075
August21st to endNight
58%
594
20%
1782
19%
594
65%
594
25%
1186
September1st to 10thNight
55%
540
17%
1862
16%
540
61%
540
20%
1232
September11th to 20thNight
52%
540
19%
1980
16%
540
60%
540
18%
1341
September21st to endNight
43%
540
19%
1980
13%
540
52%
540
19%
1278
October1st to 10thNight
36%
652
19%
2092
12%
652
42%
652
18%
1450
October11th to 20thNight
33%
720
14%
2160
7%
720
39%
720
15%
1611
October21st to endNight
34%
847
15%
2431
7%
847
40%
847
15%
1820
November1st to 10thNight
37%
925
15%
2405
6%
925
44%
925
19%
1784
November11th to 20thNight
31%
950
16%
2606
5%
950
39%
950
15%
2028
November21st to endNight
34%
950
13%
2660
8%
950
38%
950
16%
1994
December1st to 10thNight
28%
950
8%
2660
3%
950
33%
950
14%
2082
December11th to 20thNight
30%
949
11%
3175
4%
949
35%
949
11%
2314
December21st to endNight
23%
1037
7%
5062
3%
1026
31%
1026
5%
3970

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
12%7%37%6%35%5%5%7%41%
78511
Night
10%7%37%5%3445%7%43%
80718
TransparencyDay
29%35%9%17%9%1
78218
Night
29%34%9%17%9%1
80531
SeeingDay
16%9%31%29%13%3
14852
Night
14%8%34%33%10%1
24959

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
9%12%5%13%11%6%7%5%45%22%
2442
11th to 20thDay
6%13%6%9%7%310%47%10%24%
2763
21st to endDay
6%12%6%13%12%6%6%6%45%23%
3135
February1st to 10thDay
10%9%6%11%9%5%7%6%5%6%27%
1710
11th to 20thDay
9%10%5%9%7%35%5%5%7%34%
1669
21st to endDay
13%10%5%8%6%46%5%47%33%
1480
March1st to 10thDay
15%10%5%8%423447%37%
1912
11th to 20thDay
13%10%48%6%346%5%7%35%
1980
21st to endDay
18%14%46%5%3445%6%30%
2178
April1st to 10thDay
16%7%37%5%3446%7%38%
2034
11th to 20thDay
20%9%36%434446%37%
2302
21st to endDay
22%7%25%5%3445%7%37%
2340
May1st to 10thDay
18%7%36%5%35%5%7%6%36%
2340
11th to 20thDay
16%8%36%6%35%5%6%7%37%
2302
21st to endDay
18%6%25%5%446%5%8%37%
2712
June1st to 10thDay
11%4245%335%6%8%49%
2564
11th to 20thDay
13%6%25%5%35%5%6%7%44%
2700
21st to endDay
9%424435%46%9%49%
2700
July1st to 10thDay
5%3245%245%6%10%53%
2694
11th to 20thDay
5%32442445%8%60%
2444
21st to endDay
5%323435%5%6%9%56%
2546
August1st to 10thDay
10%5%26%5%45%5%6%9%44%
2328
11th to 20thDay
9%5%25%435%5%6%9%47%
2301
21st to endDay
8%415%42335%7%57%
2574
September1st to 10thDay
15%424433446%51%
2094
11th to 20thDay
10%5%3432335%8%53%
1980
21st to endDay
10%425%43445%7%52%
1980
October1st to 10thDay
16%6%245%2445%6%47%
1850
11th to 20thDay
14%7%23422345%53%
1800
21st to endDay
16%7%36%423346%46%
1922
November1st to 10thDay
11%6%25%43445%7%48%
1673
11th to 20thDay
9%8%39%6%46%5%37%40%
1573
21st to endDay
12%8%46%4345%7%6%41%
1520
December1st to 10thDay
8%8%49%8%36%5%6%7%36%
1520
11th to 20thDay
8%12%48%8%5%6%6%5%7%31%
1918
21st to endDay
16%8%5%15%7%345%5%8%24%
2531
January1st to 10thNight
10%12%411%12%46%5%5%6%25%
4510
11th to 20thNight
5%10%5%9%9%48%6%9%8%28%
4201
21st to endNight
6%12%6%13%7%46%6%5%6%28%
4532
February1st to 10thNight
9%11%5%9%6%45%45%6%38%
2470
11th to 20thNight
9%10%47%5%445%5%6%42%
2397
21st to endNight
9%8%48%6%36%447%41%
1779
March1st to 10thNight
10%7%47%5%345%5%7%43%
2048
11th to 20thNight
13%8%46%5%45%45%6%41%
1980
21st to endNight
17%9%36%6%4445%7%36%
2178
April1st to 10thNight
14%8%26%435%5%5%8%39%
1925
11th to 20thNight
15%10%26%5%34346%42%
1604
21st to endNight
16%7%36%4345%5%6%41%
1620
May1st to 10thNight
14%6%25%4345%6%8%43%
1620
11th to 20thNight
15%6%25%42445%8%45%
1593
21st to endNight
14%6%35%5%345%6%8%41%
1564
June1st to 10thNight
6%5%234245%5%8%55%
1391
11th to 20thNight
7%5%233245%5%11%52%
1260
21st to endNight
7%3135%2445%8%58%
1260
July1st to 10thNight
5%21443346%10%59%
1262
11th to 20thNight
321233445%8%66%
1512
21st to endNight
43223235%6%11%59%
1772
August1st to 10thNight
7%4245%35%5%5%9%51%
1611
11th to 20thNight
8%32331445%6%60%
1600
21st to endNight
5%3134235%48%62%
1782
September1st to 10thNight
9%41432345%7%57%
1862
11th to 20thNight
9%4143245%5%6%58%
1980
21st to endNight
9%5%23323447%59%
1980
October1st to 10thNight
16%5%23423446%51%
2092
11th to 20thNight
13%7%24323346%53%
2160
21st to endNight
14%7%25%423346%49%
2431
November1st to 10thNight
9%4245%2446%7%52%
2405
11th to 20thNight
9%6%37%5%345%5%7%47%
2606
21st to endNight
9%7%36%5%3436%7%48%
2660
December1st to 10thNight
8%8%48%6%35%5%5%7%40%
2660
11th to 20thNight
10%9%36%7%45%5%5%7%39%
3279
21st to endNight
17%10%5%14%7%34445%28%
5132

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
51%27%8%11%3
2443
11th to 20thDay
46%24%6%19%4
2763
21st to endDay
51%23%11%10%4
3135
February1st to 10thDay
39%35%9%12%5%1
1710
11th to 20thDay
33%36%9%14%7%1
1678
21st to endDay
36%37%9%14%41
1480
March1st to 10thDay
34%36%10%15%5%1
1912
11th to 20thDay
34%37%9%15%5%
1980
21st to endDay
39%36%10%11%31
2178
April1st to 10thDay
29%36%9%17%9%1
2034
11th to 20thDay
33%35%7%13%11%1
2302
21st to endDay
31%37%8%18%6%
2340
May1st to 10thDay
32%37%8%14%10%
2340
11th to 20thDay
27%37%10%18%8%1
2306
21st to endDay
31%37%8%15%8%1
2712
June1st to 10thDay
26%37%11%17%9%1
2564
11th to 20thDay
24%37%9%15%12%3
2700
21st to endDay
20%37%12%19%11%2
2700
July1st to 10thDay
18%38%12%20%11%1
2620
11th to 20thDay
15%38%8%17%15%6%
2369
21st to endDay
15%38%9%23%12%2
2405
August1st to 10thDay
23%37%12%17%9%2
2314
11th to 20thDay
21%36%9%23%10%1
2301
21st to endDay
16%36%8%19%16%4
2574
September1st to 10thDay
21%36%6%19%15%2
2094
11th to 20thDay
22%36%10%21%11%1
1980
21st to endDay
18%36%9%22%13%1
1980
October1st to 10thDay
22%36%8%19%14%1
1850
11th to 20thDay
26%35%8%19%11%2
1800
21st to endDay
28%36%8%17%10%1
1922
November1st to 10thDay
19%41%10%19%9%3
1673
11th to 20thDay
28%39%10%14%8%
1573
21st to endDay
23%40%11%18%7%1
1520
December1st to 10thDay
30%40%11%14%5%1
1520
11th to 20thDay
36%32%14%15%3
1915
21st to endDay
45%26%11%13%4
2531
January1st to 10thNight
51%25%7%14%3
4510
11th to 20thNight
40%25%10%17%6%1
4201
21st to endNight
46%24%11%12%7%
4532
February1st to 10thNight
33%34%7%18%7%1
2470
11th to 20thNight
28%35%9%18%9%2
2398
21st to endNight
30%36%10%17%6%1
1779
March1st to 10thNight
29%36%11%18%5%1
2048
11th to 20thNight
29%37%8%18%8%1
1980
21st to endNight
35%36%9%14%41
2178
April1st to 10thNight
27%37%8%16%11%
1925
11th to 20thNight
29%36%5%16%12%2
1604
21st to endNight
29%36%9%17%8%1
1620
May1st to 10thNight
25%37%9%18%10%1
1620
11th to 20thNight
24%38%8%16%12%1
1594
21st to endNight
29%38%9%14%8%2
1565
June1st to 10thNight
20%37%11%20%11%1
1391
11th to 20thNight
17%37%12%15%15%4
1260
21st to endNight
16%37%11%19%16%2
1260
July1st to 10thNight
17%38%10%22%11%2
1227
11th to 20thNight
12%38%10%19%16%5%
1464
21st to endNight
13%38%10%20%15%2
1673
August1st to 10thNight
21%36%10%20%11%3
1601
11th to 20thNight
14%37%10%24%14%2
1600
21st to endNight
14%36%10%18%17%5%
1782
September1st to 10thNight
17%36%8%20%15%4
1862
11th to 20thNight
18%37%8%22%13%2
1980
21st to endNight
15%36%7%25%15%2
1980
October1st to 10thNight
20%36%8%19%17%1
2092
11th to 20thNight
27%35%7%19%10%2
2160
21st to endNight
25%36%9%16%12%1
2431
November1st to 10thNight
17%40%10%14%15%4
2405
11th to 20thNight
25%40%10%14%11%1
2606
21st to endNight
21%40%10%18%10%1
2660
December1st to 10thNight
27%39%12%17%5%
2660
11th to 20thNight
29%33%16%17%4
3281
21st to endNight
47%25%7%15%5%
5132

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
16%12%32%27%10%3
270
11th to 20thDay
18%10%37%28%6%1
270
21st to endDay
14%9%37%26%11%1
297
February1st to 10thDay
12%18%39%29%3
270
11th to 20thDay
12%16%40%24%8%
267
21st to endDay
22%14%40%19%5%
198
March1st to 10thDay
23%14%36%23%5%1
240
11th to 20thDay
23%6%39%21%10%1
240
21st to endDay
31%11%36%14%6%2
264
April1st to 10thDay
24%17%35%19%5%
294
11th to 20thDay
27%11%33%22%6%1
580
21st to endDay
27%12%28%22%9%2
600
May1st to 10thDay
21%13%31%25%9%1
603
11th to 20thDay
21%10%28%26%13%2
625
21st to endDay
21%7%29%30%11%3
679
June1st to 10thDay
9%7%23%36%21%4
630
11th to 20thDay
14%6%35%30%12%4
630
21st to endDay
11%6%31%35%14%3
630
July1st to 10thDay
5%421%40%26%5%
621
11th to 20thDay
6%6%30%35%20%3
618
21st to endDay
5%424%40%22%4
684
August1st to 10thDay
10%5%20%39%21%4
626
11th to 20thDay
10%5%25%34%22%4
615
21st to endDay
10%5%25%34%22%5%
693
September1st to 10thDay
17%6%24%33%16%4
384
11th to 20thDay
8%436%33%14%3
270
21st to endDay
16%11%36%24%11%2
270
October1st to 10thDay
20%10%26%27%11%6%
270
11th to 20thDay
17%16%35%24%7%1
270
21st to endDay
23%15%36%19%6%
297
November1st to 10thDay
19%11%34%24%8%3
270
11th to 20thDay
15%16%43%20%6%
270
21st to endDay
20%14%36%21%9%1
270
December1st to 10thDay
11%11%43%23%9%2
270
11th to 20thDay
16%13%37%26%7%
270
21st to endDay
22%12%39%23%21
297
January1st to 10thNight
13%10%36%31%9%1
950
11th to 20thNight
14%11%35%32%6%1
950
21st to endNight
15%9%38%30%8%
1045
February1st to 10thNight
15%9%41%29%5%1
950
11th to 20thNight
13%11%38%29%8%1
927
21st to endNight
13%8%38%30%9%1
595
March1st to 10thNight
14%9%38%30%8%
608
11th to 20thNight
16%8%37%33%4
540
21st to endNight
20%10%34%27%8%1
594
April1st to 10thNight
19%11%39%28%3
540
11th to 20thNight
22%13%32%26%6%1
533
21st to endNight
20%11%33%26%9%1
540
May1st to 10thNight
17%7%36%31%9%
540
11th to 20thNight
18%9%29%33%10%1
531
21st to endNight
17%5%33%34%11%
584
June1st to 10thNight
9%5%27%41%18%1
540
11th to 20thNight
11%5%32%39%12%1
540
21st to endNight
8%426%46%16%
540
July1st to 10thNight
6%122%45%26%1
525
11th to 20thNight
4126%50%17%1
522
21st to endNight
5%322%53%17%1
591
August1st to 10thNight
8%220%48%20%1
537
11th to 20thNight
8%324%39%24%1
534
21st to endNight
6%228%41%20%2
594
September1st to 10thNight
10%6%26%42%14%3
540
11th to 20thNight
11%332%37%15%2
540
21st to endNight
11%6%36%33%12%1
540
October1st to 10thNight
18%9%33%29%10%1
652
11th to 20thNight
16%12%35%30%6%1
720
21st to endNight
18%12%32%28%9%
847
November1st to 10thNight
11%10%37%32%9%1
925
11th to 20thNight
13%12%39%30%6%
950
21st to endNight
13%11%37%32%7%
950
December1st to 10thNight
13%10%40%30%6%
950
11th to 20thNight
17%7%36%31%8%1
950
21st to endNight
21%11%35%26%6%
1045
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