Brainerd
Clear Sky Chart
History

This sumarizes the distribution of each different forecast outcome for the Brainerd clear sky chart from 2005-11-06 to 2024-01-13.

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
35%
24934
15%
74621
8%
24874
41%
24874
21%
51519

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
27%
950
13%
2837
5%
946
35%
946
17%
2051
January11th to 20thNight
25%
915
9%
2631
4%
915
29%
915
14%
2010
January21st to endNight
23%
990
13%
2574
4%
990
30%
990
15%
2028
February1st to 10thNight
27%
900
14%
2340
4%
900
34%
900
22%
1668
February11th to 20thNight
29%
879
18%
2273
6%
874
36%
874
24%
1581
February21st to endNight
26%
740
16%
1924
5%
740
35%
740
19%
1442
March1st to 10thNight
29%
572
13%
2012
9%
572
36%
572
17%
1388
March11th to 20thNight
28%
540
18%
1980
11%
540
40%
540
20%
1285
March21st to endNight
32%
594
16%
2178
13%
594
39%
594
16%
1505
April1st to 10thNight
28%
540
15%
1805
10%
540
38%
540
19%
1232
April11th to 20thNight
31%
533
18%
1683
14%
533
41%
533
18%
1191
April21st to endNight
32%
540
15%
1620
9%
540
39%
540
21%
1138
May1st to 10thNight
34%
540
15%
1526
8%
540
38%
540
24%
1049
May11th to 20thNight
39%
531
17%
1417
7%
531
45%
531
27%
964
May21st to endNight
45%
584
13%
1552
5%
582
48%
582
29%
1043
June1st to 10thNight
49%
540
13%
1339
5%
540
53%
540
34%
883
June11th to 20thNight
45%
540
14%
1260
5%
540
50%
540
37%
829
June21st to endNight
53%
540
14%
1260
7%
540
55%
540
37%
830
July1st to 10thNight
66%
525
17%
1225
8%
525
68%
525
51%
731
July11th to 20thNight
56%
522
20%
1265
9%
522
59%
522
44%
771
July21st to endNight
65%
591
20%
1505
11%
558
67%
558
46%
830
August1st to 10thNight
64%
537
19%
1601
15%
534
68%
534
37%
924
August11th to 20thNight
58%
534
21%
1600
18%
534
64%
534
34%
944
August21st to endNight
55%
594
24%
1832
23%
594
63%
594
36%
1018
September1st to 10thNight
56%
540
21%
1800
20%
540
62%
540
33%
1005
September11th to 20thNight
48%
540
22%
1872
18%
540
58%
540
31%
1059
September21st to endNight
40%
576
23%
2016
15%
576
51%
576
27%
1167
October1st to 10thNight
36%
720
19%
2160
12%
720
41%
720
25%
1403
October11th to 20thNight
30%
720
19%
2160
10%
720
38%
720
21%
1467
October21st to endNight
28%
804
16%
2400
7%
804
36%
804
18%
1704
November1st to 10thNight
30%
925
18%
2591
9%
925
38%
925
20%
1824
November11th to 20thNight
25%
950
14%
2660
6%
950
31%
950
16%
1990
November21st to endNight
24%
950
14%
2660
5%
950
31%
950
19%
1909
December1st to 10thNight
25%
950
9%
2660
4%
950
29%
950
13%
2080
December11th to 20thNight
18%
949
11%
3245
3%
949
26%
949
11%
2474
December21st to endNight
16%
1039
6%
5158
3%
1026
24%
1026
6%
4102

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%9%47%6%35%5%5%7%36%
74812
Night
12%9%48%6%3445%7%37%
74936
TransparencyDay
47%7%13%23%10%1
74503
Night
47%6%12%23%11%1
74765
SeeingDay
16%9%31%27%14%4
14903
Night
16%8%33%31%11%1
24941

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
7%11%8%10%8%5%5%5%5%7%28%
1328
11th to 20thDay
11%14%6%13%10%45%6%5%6%20%
1380
21st to endDay
8%13%8%12%12%5%6%5%6%7%18%
1782
February1st to 10thDay
9%10%6%9%9%46%6%7%6%29%
1620
11th to 20thDay
8%10%5%8%9%6%5%5%7%7%31%
1574
21st to endDay
10%11%5%9%9%35%7%47%29%
1332
March1st to 10thDay
12%11%48%7%45%5%5%7%30%
1966
11th to 20thDay
14%9%48%5%35%5%6%8%34%
1980
21st to endDay
19%10%48%6%3445%6%32%
2178
April1st to 10thDay
17%10%47%6%35%45%6%33%
2155
11th to 20thDay
18%13%47%5%35%45%6%31%
2226
21st to endDay
21%10%46%5%34445%33%
2340
May1st to 10thDay
17%8%47%6%35%5%5%6%34%
2434
11th to 20thDay
16%7%35%5%35%5%6%8%37%
2479
21st to endDay
15%6%36%6%35%6%5%8%37%
2725
June1st to 10thDay
12%5%245%35%5%7%8%42%
2617
11th to 20thDay
15%5%36%6%35%46%7%40%
2700
21st to endDay
10%5%25%6%46%6%7%9%40%
2700
July1st to 10thDay
6%3245%36%5%6%9%51%
2700
11th to 20thDay
8%5%25%5%35%5%6%9%47%
2651
21st to endDay
6%4245%345%8%9%50%
2721
August1st to 10thDay
9%435%6%45%6%6%8%45%
2328
11th to 20thDay
12%6%346%35%5%48%45%
2301
21st to endDay
12%5%245%3445%7%49%
2523
September1st to 10thDay
10%6%26%43446%9%46%
2160
11th to 20thDay
12%6%35%6%35%5%5%8%42%
2085
21st to endDay
17%6%26%5%345%6%7%41%
1926
October1st to 10thDay
18%9%26%5%2445%7%38%
1800
11th to 20thDay
18%12%45%6%34346%36%
1800
21st to endDay
19%10%5%7%5%44445%33%
1954
November1st to 10thDay
13%12%5%8%6%35%45%5%33%
1487
11th to 20thDay
12%15%7%13%7%35%336%27%
1520
21st to endDay
13%12%6%8%7%36%5%6%6%28%
1520
December1st to 10thDay
10%14%6%9%9%6%6%5%46%23%
1520
11th to 20thDay
10%14%7%11%8%5%6%45%5%25%
1858
21st to endDay
22%15%6%12%9%3433418%
2442
January1st to 10thNight
8%8%5%12%9%5%5%5%7%7%28%
2837
11th to 20thNight
10%15%5%12%7%35%6%6%8%23%
2631
21st to endNight
11%13%6%13%8%45%6%7%6%21%
2574
February1st to 10thNight
6%9%6%10%8%46%5%6%7%34%
2340
11th to 20thNight
6%11%49%7%445%6%8%37%
2273
21st to endNight
11%12%5%9%7%45%5%5%7%30%
1924
March1st to 10thNight
11%10%5%8%7%45%45%7%34%
2012
11th to 20thNight
11%11%47%5%3445%5%40%
1980
21st to endNight
15%11%48%6%345%5%6%34%
2178
April1st to 10thNight
17%11%46%444446%35%
1805
11th to 20thNight
18%11%5%7%43444436%
1683
21st to endNight
19%10%37%5%3435%6%36%
1620
May1st to 10thNight
17%9%46%5%24346%41%
1526
11th to 20thNight
15%5%35%5%245%5%8%41%
1416
21st to endNight
13%5%246%35%5%7%7%42%
1551
June1st to 10thNight
11%4244345%7%8%46%
1339
11th to 20thNight
9%425%5%4446%10%46%
1260
21st to endNight
10%5%36%4235%5%9%48%
1260
July1st to 10thNight
32234345%7%10%58%
1260
11th to 20thNight
7%2245%3446%7%57%
1307
21st to endNight
331443446%8%60%
1594
August1st to 10thNight
6%3344345%7%10%50%
1611
11th to 20thNight
11%42343435%7%54%
1600
21st to endNight
10%324423448%56%
1832
September1st to 10thNight
9%425%43446%7%52%
1800
11th to 20thNight
10%5%245%34447%52%
1872
21st to endNight
15%5%2442435%6%49%
2016
October1st to 10thNight
15%8%25%5%2435%7%42%
2160
11th to 20thNight
15%11%36%5%35%45%6%38%
2160
21st to endNight
18%10%48%5%3445%5%34%
2400
November1st to 10thNight
13%10%48%6%345%5%6%36%
2591
11th to 20thNight
14%10%6%10%7%3345%6%30%
2660
21st to endNight
12%9%48%8%45%5%6%7%33%
2660
December1st to 10thNight
11%11%7%10%10%46%5%5%6%24%
2660
11th to 20thNight
12%13%6%10%8%45%6%5%6%25%
3319
21st to endNight
22%17%5%11%7%34345%19%
5225

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
56%6%10%21%7%
1329
11th to 20thDay
63%7%8%15%7%
1380
21st to endDay
64%5%11%12%7%
1782
February1st to 10thDay
53%5%11%21%10%1
1620
11th to 20thDay
51%5%13%21%8%2
1583
21st to endDay
54%7%9%18%12%
1332
March1st to 10thDay
52%7%14%20%7%
1966
11th to 20thDay
48%6%14%22%9%1
1980
21st to endDay
54%5%12%22%7%1
2178
April1st to 10thDay
53%5%9%19%13%1
2155
11th to 20thDay
54%5%12%17%11%1
2226
21st to endDay
53%5%10%21%11%
2340
May1st to 10thDay
51%6%10%22%9%2
2434
11th to 20thDay
46%6%13%25%9%2
2483
21st to endDay
44%8%12%24%11%1
2725
June1st to 10thDay
37%9%17%28%10%1
2617
11th to 20thDay
42%7%14%23%13%1
2700
21st to endDay
37%10%16%28%9%1
2700
July1st to 10thDay
29%8%15%30%16%1
2626
11th to 20thDay
32%9%15%28%14%2
2570
21st to endDay
28%8%17%30%15%1
2570
August1st to 10thDay
34%8%15%29%10%3
2314
11th to 20thDay
37%8%17%28%10%1
2301
21st to endDay
34%7%14%30%15%1
2523
September1st to 10thDay
34%8%14%33%11%
2160
11th to 20thDay
38%10%16%27%8%
2085
21st to endDay
42%7%12%31%8%
1926
October1st to 10thDay
46%7%14%25%9%1
1800
11th to 20thDay
50%5%11%22%9%2
1800
21st to endDay
54%5%12%21%8%
1954
November1st to 10thDay
52%6%11%19%11%1
1487
11th to 20thDay
60%5%11%15%8%1
1520
21st to endDay
53%8%13%17%6%2
1520
December1st to 10thDay
60%7%13%15%5%
1520
11th to 20thDay
60%5%13%18%4
1855
21st to endDay
70%5%6%12%6%
2442
January1st to 10thNight
53%6%11%21%9%1
2837
11th to 20thNight
58%6%13%14%8%1
2631
21st to endNight
61%5%10%16%8%1
2574
February1st to 10thNight
48%6%12%22%11%1
2340
11th to 20thNight
44%6%13%23%11%2
2274
21st to endNight
53%6%8%20%11%1
1924
March1st to 10thNight
50%6%14%20%9%1
2012
11th to 20thNight
47%5%13%22%13%1
1980
21st to endNight
52%6%12%22%8%2
2178
April1st to 10thNight
49%5%11%19%16%1
1805
11th to 20thNight
52%5%6%19%16%1
1683
21st to endNight
49%6%10%20%14%2
1620
May1st to 10thNight
45%6%12%24%12%1
1526
11th to 20thNight
41%7%12%24%13%2
1417
21st to endNight
39%8%13%21%16%2
1552
June1st to 10thNight
34%9%17%29%9%2
1339
11th to 20thNight
33%7%17%24%16%2
1260
21st to endNight
33%8%16%29%12%2
1260
July1st to 10thNight
21%8%19%34%18%1
1225
11th to 20thNight
26%8%14%31%17%5%
1265
21st to endNight
22%7%17%34%18%3
1505
August1st to 10thNight
28%8%14%35%10%4
1601
11th to 20thNight
31%8%16%31%14%1
1600
21st to endNight
28%6%13%32%19%2
1832
September1st to 10thNight
30%7%15%33%14%1
1800
11th to 20thNight
32%7%16%33%13%
1872
21st to endNight
36%6%11%35%12%
2016
October1st to 10thNight
43%5%11%29%11%1
2160
11th to 20thNight
46%6%11%25%11%1
2160
21st to endNight
51%6%12%22%9%
2400
November1st to 10thNight
48%6%11%23%10%1
2591
11th to 20thNight
54%7%13%16%9%1
2660
21st to endNight
49%7%16%20%6%2
2660
December1st to 10thNight
59%7%12%16%5%1
2660
11th to 20thNight
59%6%12%16%6%2
3321
21st to endNight
69%48%13%5%
5225

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
12%9%34%32%11%3
270
11th to 20thDay
18%9%29%35%8%
246
21st to endDay
13%8%41%21%14%3
264
February1st to 10thDay
15%15%45%21%4
240
11th to 20thDay
16%17%36%21%8%1
240
21st to endDay
16%9%40%32%31
198
March1st to 10thDay
17%13%36%25%8%2
240
11th to 20thDay
17%8%33%29%10%3
240
21st to endDay
21%13%29%19%15%2
264
April1st to 10thDay
23%15%30%24%8%1
415
11th to 20thDay
27%11%27%23%12%1
504
21st to endDay
25%10%29%22%12%1
600
May1st to 10thDay
21%13%31%22%11%2
603
11th to 20thDay
20%11%28%25%12%3
625
21st to endDay
18%8%27%31%14%3
679
June1st to 10thDay
12%6%29%31%18%4
630
11th to 20thDay
16%8%35%28%11%2
630
21st to endDay
11%7%32%28%16%5%
630
July1st to 10thDay
7%423%29%28%9%
621
11th to 20thDay
9%6%29%30%18%8%
618
21st to endDay
6%5%24%34%24%7%
684
August1st to 10thDay
10%422%32%26%6%
626
11th to 20thDay
12%6%21%33%23%6%
615
21st to endDay
11%7%27%29%20%5%
642
September1st to 10thDay
11%7%30%31%18%4
450
11th to 20thDay
11%6%29%30%18%6%
375
21st to endDay
23%10%30%23%10%3
270
October1st to 10thDay
22%9%27%24%12%5%
270
11th to 20thDay
16%14%38%25%6%1
270
21st to endDay
26%15%36%15%6%1
297
November1st to 10thDay
17%11%37%25%9%1
270
11th to 20thDay
19%13%44%21%3
270
21st to endDay
23%10%41%22%4
270
December1st to 10thDay
14%10%43%23%9%1
270
11th to 20thDay
18%14%38%28%2
270
21st to endDay
26%10%34%25%41
297
January1st to 10thNight
11%11%37%29%9%2
950
11th to 20thNight
16%10%35%30%8%1
915
21st to endNight
17%10%38%27%7%1
990
February1st to 10thNight
10%10%39%31%9%1
900
11th to 20thNight
11%11%42%26%9%1
879
21st to endNight
16%9%36%28%10%1
740
March1st to 10thNight
15%10%36%28%9%2
572
11th to 20thNight
16%9%42%26%6%
540
21st to endNight
22%8%29%27%11%3
594
April1st to 10thNight
20%10%36%28%6%1
540
11th to 20thNight
25%7%29%30%9%1
533
21st to endNight
22%7%31%29%9%1
540
May1st to 10thNight
18%8%36%29%8%1
540
11th to 20thNight
17%8%31%34%10%1
531
21st to endNight
14%7%28%37%13%
584
June1st to 10thNight
13%429%39%15%1
540
11th to 20thNight
11%434%42%10%
540
21st to endNight
11%5%23%41%18%1
540
July1st to 10thNight
5%222%45%24%2
525
11th to 20thNight
7%328%43%17%1
522
21st to endNight
5%223%45%23%2
591
August1st to 10thNight
7%219%49%20%3
537
11th to 20thNight
13%220%38%25%2
534
21st to endNight
11%425%36%22%2
594
September1st to 10thNight
10%6%22%43%17%2
540
11th to 20thNight
11%6%29%34%19%2
540
21st to endNight
17%7%33%28%13%2
576
October1st to 10thNight
19%10%31%27%13%1
720
11th to 20thNight
21%9%35%28%5%1
720
21st to endNight
23%10%34%27%6%
804
November1st to 10thNight
18%9%33%31%9%
925
11th to 20thNight
19%13%35%25%8%1
950
21st to endNight
17%13%40%24%6%
950
December1st to 10thNight
16%11%36%29%7%1
950
11th to 20thNight
19%11%36%26%7%1
950
21st to endNight
25%10%36%23%6%1
1045
Page generated at 2024-01-10 09:16:11. Version ac07

Copyright 2024 Attilla Danko


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