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 2024-11-11.

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%
25840
14%
97195
8%
25574
41%
25574
17%
65117

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
28%
940
11%
4687
6%
926
36%
926
11%
3332
January11th to 20thNight
25%
941
7%
4510
4%
930
29%
930
8%
3448
January21st to endNight
22%
1031
9%
4491
4%
1023
29%
1023
9%
3482
February1st to 10thNight
28%
950
15%
2470
4%
950
35%
950
22%
1751
February11th to 20thNight
28%
929
18%
2403
6%
924
36%
924
25%
1664
February21st to endNight
27%
785
16%
2041
4%
785
35%
785
20%
1513
March1st to 10thNight
29%
598
25%
3427
9%
588
36%
588
13%
1836
March11th to 20thNight
27%
565
17%
3443
11%
550
40%
550
13%
2023
March21st to endNight
31%
620
10%
3758
13%
605
39%
605
9%
2751
April1st to 10thNight
28%
570
16%
1905
11%
570
39%
570
20%
1293
April11th to 20thNight
31%
563
18%
1777
14%
563
40%
563
19%
1239
April21st to endNight
33%
570
14%
1710
9%
570
39%
570
21%
1188
May1st to 10thNight
33%
568
19%
2647
8%
559
38%
559
16%
1619
May11th to 20thNight
38%
552
16%
2443
7%
541
44%
541
19%
1384
May21st to endNight
44%
606
10%
2721
5%
593
48%
593
17%
1771
June1st to 10thNight
48%
570
13%
1413
5%
570
52%
570
35%
929
June11th to 20thNight
44%
570
14%
1330
5%
570
49%
570
37%
880
June21st to endNight
52%
570
14%
1330
7%
570
53%
570
36%
881
July1st to 10thNight
65%
541
12%
2127
8%
535
67%
535
29%
1280
July11th to 20thNight
56%
536
19%
1939
9%
533
59%
533
36%
954
July21st to endNight
64%
609
14%
2504
11%
569
66%
569
31%
1249
August1st to 10thNight
63%
559
19%
2613
15%
544
67%
544
24%
1461
August11th to 20thNight
58%
548
16%
2538
18%
543
63%
543
22%
1457
August21st to endNight
54%
616
17%
3058
23%
605
62%
605
22%
1732
September1st to 10thNight
56%
570
22%
1900
21%
570
63%
570
34%
1048
September11th to 20thNight
48%
570
22%
1976
18%
570
57%
570
32%
1101
September21st to endNight
41%
608
24%
2128
16%
608
52%
608
28%
1211
October1st to 10thNight
36%
760
17%
2394
12%
740
42%
740
23%
1597
October11th to 20thNight
30%
760
14%
2863
9%
740
38%
740
16%
2033
October21st to endNight
27%
849
11%
3528
7%
827
35%
827
12%
2517
November1st to 10thNight
30%
975
18%
2731
9%
975
37%
975
20%
1931
November11th to 20thNight
24%
953
14%
2667
6%
953
31%
953
16%
1997
November21st to endNight
24%
950
14%
2660
5%
950
31%
950
19%
1909
December1st to 10thNight
24%
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%38%5%5%5%46%7%37%
101852
Night
12%10%49%5%4445%6%37%
97401
TransparencyDay
46%6%13%24%10%1
105448
Night
46%6%12%24%11%1
101946
SeeingDay
16%9%31%27%14%4
16116
Night
15%8%33%31%11%1
25999

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%17%6%15%8%5%5%35%6%23%
2218
11th to 20thDay
6%10%5%15%11%9%8%7%6%5%17%
2391
21st to endDay
6%16%11%15%9%6%445%5%19%
3135
February1st to 10thDay
9%11%5%11%8%5%5%46%6%29%
1710
11th to 20thDay
7%11%49%8%6%5%37%7%33%
1664
21st to endDay
9%12%411%7%5%5%5%48%30%
1413
March1st to 10thDay
11%12%310%5%5%5%45%6%34%
3422
11th to 20thDay
9%9%410%5%4436%8%39%
3480
21st to endDay
20%13%410%5%45%346%27%
3814
April1st to 10thDay
17%11%47%5%5%435%5%34%
2275
11th to 20thDay
18%13%48%44435%6%31%
2352
21st to endDay
21%10%36%5%44345%33%
2470
May1st to 10thDay
18%7%37%44445%7%37%
4260
11th to 20thDay
15%6%26%44436%7%42%
4399
21st to endDay
18%7%37%5%45%45%7%35%
4824
June1st to 10thDay
11%6%25%5%5%5%47%8%42%
2763
11th to 20thDay
16%6%37%5%4446%7%39%
2850
21st to endDay
10%6%25%5%5%6%5%8%9%40%
2850
July1st to 10thDay
8%5%26%5%6%7%5%7%9%40%
4750
11th to 20thDay
6%41434446%9%54%
4662
21st to endDay
7%5%15%44447%10%49%
4765
August1st to 10thDay
13%5%25%44446%8%45%
4104
11th to 20thDay
12%6%26%5%45%35%9%43%
4041
21st to endDay
13%7%36%44445%6%44%
4439
September1st to 10thDay
10%6%26%34446%9%47%
2280
11th to 20thDay
11%6%26%5%45%45%8%44%
2200
21st to endDay
16%6%26%43445%7%43%
2032
October1st to 10thDay
18%9%26%43435%7%39%
1900
11th to 20thDay
16%13%36%5%44246%37%
1900
21st to endDay
19%11%5%8%45%4345%33%
2062
November1st to 10thDay
13%13%410%5%5%435%5%32%
1567
11th to 20thDay
12%15%7%14%6%44335%26%
1520
21st to endDay
13%12%5%9%6%45%47%6%28%
1520
December1st to 10thDay
10%15%6%11%8%6%6%45%5%23%
1520
11th to 20thDay
10%15%6%12%7%6%5%45%5%25%
1858
21st to endDay
22%16%5%15%6%4323418%
2442
January1st to 10thNight
10%11%5%15%7%5%446%6%26%
4737
11th to 20thNight
6%13%414%9%8%10%5%6%7%19%
4560
21st to endNight
8%18%10%15%6%5%5%45%5%22%
4532
February1st to 10thNight
6%10%5%11%6%6%5%46%7%34%
2470
11th to 20thNight
5%11%410%6%5%446%8%37%
2403
21st to endNight
10%12%410%6%5%5%45%7%31%
2041
March1st to 10thNight
9%9%37%5%4445%7%44%
3463
11th to 20thNight
9%10%310%6%6%6%45%5%38%
3480
21st to endNight
21%14%5%11%433335%27%
3817
April1st to 10thNight
16%11%37%444446%36%
1905
11th to 20thNight
18%12%48%33434437%
1777
21st to endNight
19%10%37%44335%6%36%
1710
May1st to 10thNight
16%8%37%44435%6%40%
2645
11th to 20thNight
15%5%25%43445%7%46%
2506
21st to endNight
17%7%35%5%4446%6%38%
2743
June1st to 10thNight
11%5%15%44447%8%46%
1413
11th to 20thNight
9%5%26%45%436%9%45%
1330
21st to endNight
10%6%27%43346%8%47%
1330
July1st to 10thNight
10%425%445%5%8%10%44%
2220
11th to 20thNight
5%21433435%7%62%
2306
21st to endNight
4425%44447%8%56%
2795
August1st to 10thNight
11%5%35%44435%8%49%
2836
11th to 20thNight
14%5%25%33436%7%50%
2798
21st to endNight
11%6%26%43445%8%47%
3224
September1st to 10thNight
9%425%33436%7%53%
1900
11th to 20thNight
9%5%25%44435%7%53%
1976
21st to endNight
14%5%15%333246%51%
2128
October1st to 10thNight
14%8%26%43435%6%44%
2280
11th to 20thNight
15%11%27%44435%6%39%
2280
21st to endNight
18%11%38%44435%5%34%
2534
November1st to 10thNight
13%11%48%6%4445%6%35%
2731
11th to 20thNight
14%12%6%12%6%4435%5%30%
2667
21st to endNight
12%10%49%7%45%46%6%33%
2660
December1st to 10thNight
10%12%6%11%9%6%5%5%5%6%24%
2660
11th to 20thNight
11%14%6%12%7%6%5%5%5%6%25%
3319
21st to endNight
22%18%5%12%6%5%324419%
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
62%5%9%18%5%
2219
11th to 20thDay
65%6%8%16%5%
2391
21st to endDay
65%6%9%14%5%
3135
February1st to 10thDay
53%5%10%21%10%1
1710
11th to 20thDay
50%5%13%22%8%1
1673
21st to endDay
52%7%10%18%12%1
1413
March1st to 10thDay
49%7%12%23%9%
3422
11th to 20thDay
43%5%14%28%9%
3480
21st to endDay
59%5%11%20%4
3814
April1st to 10thDay
52%5%9%19%13%1
2275
11th to 20thDay
53%5%12%18%12%1
2352
21st to endDay
53%5%10%21%10%
2470
May1st to 10thDay
45%6%13%22%13%2
4298
11th to 20thDay
40%6%14%27%10%3
4403
21st to endDay
45%9%13%24%8%1
4837
June1st to 10thDay
36%8%17%28%10%1
2763
11th to 20thDay
43%7%13%22%14%1
2850
21st to endDay
37%10%16%27%9%
2850
July1st to 10thDay
40%6%19%22%13%1
4676
11th to 20thDay
25%6%17%37%13%1
4581
21st to endDay
30%6%18%33%13%1
4615
August1st to 10thDay
36%6%14%29%13%2
4090
11th to 20thDay
39%5%16%31%9%
4080
21st to endDay
41%5%15%27%11%1
4438
September1st to 10thDay
33%8%14%34%11%
2280
11th to 20thDay
37%10%17%28%8%1
2200
21st to endDay
40%7%12%32%9%1
2032
October1st to 10thDay
35%413%31%16%1
3160
11th to 20thDay
44%410%23%17%2
3140
21st to endDay
51%313%25%7%
3377
November1st to 10thDay
53%6%11%19%11%1
1567
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
57%5%11%21%6%1
4737
11th to 20thNight
63%6%13%13%5%1
4560
21st to endNight
65%48%17%5%1
4532
February1st to 10thNight
48%5%12%22%11%1
2470
11th to 20thNight
44%6%13%24%11%2
2404
21st to endNight
52%6%10%20%11%2
2041
March1st to 10thNight
40%6%15%23%15%2
3463
11th to 20thNight
46%412%23%14%
3480
21st to endNight
61%48%18%8%1
3817
April1st to 10thNight
49%5%11%19%16%1
1905
11th to 20thNight
51%5%7%20%17%1
1777
21st to endNight
48%6%10%20%14%2
1710
May1st to 10thNight
43%7%11%25%13%2
2672
11th to 20thNight
38%6%10%26%17%3
2507
21st to endNight
44%9%12%22%13%1
2751
June1st to 10thNight
34%8%17%28%10%2
1413
11th to 20thNight
34%7%17%24%16%2
1330
21st to endNight
34%7%15%29%12%2
1330
July1st to 10thNight
34%7%20%24%14%1
2185
11th to 20thNight
21%6%14%41%16%3
2264
21st to endNight
26%5%18%34%15%2
2706
August1st to 10thNight
34%5%14%29%15%4
2826
11th to 20thNight
34%5%14%34%11%1
2825
21st to endNight
36%6%17%29%11%1
3224
September1st to 10thNight
29%6%15%34%14%1
1900
11th to 20thNight
31%6%17%34%12%
1976
21st to endNight
35%5%11%35%14%
2128
October1st to 10thNight
29%37%37%20%4
3800
11th to 20thNight
40%410%25%19%1
3779
21st to endNight
48%414%23%11%
4170
November1st to 10thNight
49%6%11%23%10%1
2731
11th to 20thNight
54%7%13%16%9%1
2667
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%33%10%3
270
11th to 20thDay
16%10%31%35%7%
270
21st to endDay
11%8%39%23%16%3
297
February1st to 10thDay
14%16%40%22%7%
270
11th to 20thDay
15%17%39%20%8%1
270
21st to endDay
15%9%41%32%2
225
March1st to 10thDay
17%13%37%24%7%1
270
11th to 20thDay
16%7%36%27%10%3
270
21st to endDay
22%12%30%20%13%2
297
April1st to 10thDay
22%14%30%25%8%1
455
11th to 20thDay
26%12%27%23%11%1
550
21st to endDay
25%10%28%23%12%1
650
May1st to 10thDay
21%13%31%22%10%2
653
11th to 20thDay
19%11%28%26%12%3
675
21st to endDay
18%8%27%30%14%3
734
June1st to 10thDay
12%6%30%30%18%4
680
11th to 20thDay
18%9%35%26%10%2
680
21st to endDay
12%8%33%28%15%5%
680
July1st to 10thDay
7%5%22%28%28%9%
671
11th to 20thDay
9%6%28%29%19%9%
668
21st to endDay
6%5%24%33%24%8%
739
August1st to 10thDay
11%423%31%25%6%
676
11th to 20thDay
11%5%21%32%24%6%
665
21st to endDay
12%7%27%29%19%5%
694
September1st to 10thDay
10%7%30%32%17%4
490
11th to 20thDay
10%6%29%32%17%6%
410
21st to endDay
21%10%30%24%11%4
300
October1st to 10thDay
22%10%28%24%11%5%
300
11th to 20thDay
16%14%39%24%5%1
300
21st to endDay
25%15%37%15%6%1
330
November1st to 10thDay
18%11%37%24%9%1
300
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
15%10%36%31%8%1
950
21st to endNight
16%10%38%28%8%1
1045
February1st to 10thNight
10%10%38%31%9%1
950
11th to 20thNight
10%11%43%26%9%1
929
21st to endNight
16%9%36%29%10%1
785
March1st to 10thNight
15%10%36%28%8%2
603
11th to 20thNight
15%11%42%26%6%
570
21st to endNight
22%8%29%28%11%3
627
April1st to 10thNight
19%10%36%29%5%1
570
11th to 20thNight
24%7%29%30%9%1
563
21st to endNight
22%7%32%30%9%1
570
May1st to 10thNight
19%8%35%29%8%1
570
11th to 20thNight
16%8%32%34%9%1
561
21st to endNight
14%8%27%37%13%
617
June1st to 10thNight
13%429%39%14%1
570
11th to 20thNight
12%433%41%9%
570
21st to endNight
12%5%24%41%18%1
570
July1st to 10thNight
6%222%44%25%2
555
11th to 20thNight
7%327%43%19%1
552
21st to endNight
5%223%44%23%3
624
August1st to 10thNight
8%219%48%20%3
567
11th to 20thNight
13%219%38%25%2
564
21st to endNight
10%5%25%36%22%2
627
September1st to 10thNight
10%6%22%43%18%2
570
11th to 20thNight
11%6%30%33%19%2
570
21st to endNight
16%7%32%29%14%1
608
October1st to 10thNight
18%10%31%28%12%1
760
11th to 20thNight
21%9%36%28%5%1
760
21st to endNight
22%11%34%27%6%
849
November1st to 10thNight
19%9%33%31%9%
975
11th to 20thNight
19%13%35%25%8%1
953
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
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