Brainerd
Clear Sky Chart
History

This sumarizes the distribution of each different forecast outcome for the Brainerd clear sky chart from 2005-11-05 to 2017-09-19.

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%
16186
15%
46719
8%
16139
42%
16139
22%
32224

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 15thNight
28%
900
11%
2676
5%
895
34%
895
17%
1970
January16th to endNight
24%
960
12%
2552
3%
960
31%
960
16%
1967
February1st to 15thNight
32%
879
15%
2285
5%
875
38%
875
22%
1618
February16th to endNight
28%
789
14%
2051
5%
789
35%
789
20%
1505
March1st to 15thNight
32%
561
13%
2001
9%
561
38%
561
18%
1352
March16th to endNight
32%
576
15%
2112
12%
576
39%
576
15%
1476
April1st to 15thNight
33%
539
16%
1796
12%
539
42%
539
20%
1209
April16th to endNight
32%
540
15%
1620
11%
540
38%
540
19%
1186
May1st to 15thNight
32%
540
14%
1497
6%
540
37%
540
23%
1049
May16th to endNight
42%
563
13%
1498
5%
561
46%
561
28%
1018
June1st to 15thNight
48%
540
12%
1312
5%
540
51%
540
35%
858
June16th to endNight
53%
540
13%
1260
6%
540
55%
540
39%
813
July1st to 15thNight
59%
510
16%
1190
7%
510
61%
510
44%
742
July16th to endNight
63%
564
18%
1403
9%
531
64%
531
44%
812
August1st to 15thNight
65%
539
20%
1610
16%
536
68%
536
38%
916
August16th to endNight
54%
573
22%
1752
20%
573
61%
573
36%
990
September1st to 15thNight
57%
540
21%
1800
18%
540
64%
540
35%
987
September16th to endNight
44%
526
20%
1867
15%
526
53%
526
29%
1058
October1st to 15thNight
36%
660
22%
1980
14%
660
43%
660
27%
1247
October16th to endNight
30%
712
14%
2128
7%
712
36%
712
18%
1517
November1st to 15thNight
30%
875
17%
2451
8%
875
37%
875
21%
1728
November16th to endNight
27%
900
14%
2520
8%
900
33%
900
17%
1873
December1st to 15thNight
23%
900
8%
2520
3%
900
27%
900
12%
1997
December16th to endNight
18%
960
9%
2838
3%
960
26%
960
10%
2336

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
14%8%36%5%3445%7%35%
48110
Night
12%8%46%5%3445%6%38%
46881
Cloud CoverDay
13%8%36%5%35%45%7%35%
48121
Night
12%9%47%5%3445%7%37%
46885
Cloud CoverDay
13%8%36%5%35%45%7%35%
48119
Night
12%8%47%5%3445%7%37%
46885
TransparencyDay
47%7%13%22%8%
47787
Night
46%6%13%23%10%1
46722
SeeingDay
16%6%29%27%16%3
6184
Night
16%7%31%31%11%1
16187

By Month

Percentage Cloud Cover NE (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 15thDay
8%13%7%8%8%45%5%5%7%24%
1260
16th to endDay
9%12%7%11%6%5%5%6%6%6%22%
1671
February1st to 15thDay
7%9%6%9%7%45%45%7%30%
1575
16th to endDay
11%11%48%9%36%5%47%26%
1422
March1st to 15thDay
14%8%48%6%245%47%32%
1960
16th to endDay
18%10%37%5%3435%5%31%
2112
April1st to 15thDay
15%9%35%4345%5%6%36%
2151
16th to endDay
22%10%26%5%24445%30%
2340
May1st to 15thDay
21%8%37%6%34445%29%
2454
16th to endDay
16%5%26%5%35%45%8%36%
2617
June1st to 15thDay
16%6%244345%5%7%37%
2646
16th to endDay
13%4245%35%6%6%9%39%
2700
July1st to 15thDay
8%3145%35%46%9%48%
2700
16th to endDay
7%3145%245%7%10%47%
2667
August1st to 15thDay
8%5%35%5%35%5%5%8%43%
2340
16th to endDay
14%5%2342435%8%45%
2448
September1st to 15thDay
10%4244245%49%47%
2160
16th to endDay
15%6%25%424447%42%
1824
October1st to 15thDay
16%9%25%423337%40%
1650
16th to endDay
21%10%35%433345%32%
1744
November1st to 15thDay
13%13%35%5%24435%37%
1407
16th to endDay
16%11%5%9%7%445%5%6%24%
1440
December1st to 15thDay
14%13%6%9%7%47%45%5%22%
1440
16th to endDay
15%17%6%13%8%3433419%
1382
January1st to 15thNight
9%9%5%10%7%45%5%5%6%28%
2676
16th to endNight
11%12%6%10%6%35%5%7%6%23%
2552
February1st to 15thNight
6%11%5%9%5%35%35%8%36%
2285
16th to endNight
8%10%48%7%35%5%5%7%31%
2051
March1st to 15thNight
12%9%46%6%34445%37%
1989
16th to endNight
15%9%47%5%44445%33%
2112
April1st to 15thNight
16%10%45%324435%39%
1796
16th to endNight
21%10%36%42343434%
1620
May1st to 15thNight
19%8%35%413435%40%
1497
16th to endNight
12%426%5%3446%8%41%
1496
June1st to 15thNight
13%32432445%8%46%
1312
16th to endNight
10%32432435%11%47%
1260
July1st to 15thNight
5%31432346%8%55%
1260
16th to endNight
432333336%9%56%
1499
August1st to 15thNight
8%32342445%9%52%
1620
16th to endNight
10%31332335%8%54%
1752
September1st to 15thNight
8%31432345%7%54%
1800
16th to endNight
12%423323346%51%
1867
October1st to 15thNight
13%8%24423346%46%
1980
16th to endNight
20%10%35%333445%34%
2128
November1st to 15thNight
12%11%47%5%3344437%
2451
16th to endNight
15%9%48%6%35%45%6%31%
2520
December1st to 15thNight
13%12%6%10%7%45%45%6%23%
2520
16th to endNight
15%16%6%11%8%34345%19%
2838

Percentage Cloud Cover SW (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 15thDay
9%12%8%8%7%45%5%5%8%24%
1260
16th to endDay
9%13%6%11%8%45%5%6%6%21%
1671
February1st to 15thDay
7%10%6%8%8%46%46%7%30%
1575
16th to endDay
11%11%49%9%35%6%46%26%
1422
March1st to 15thDay
14%8%49%5%3445%7%31%
1971
16th to endDay
18%9%47%5%34446%30%
2112
April1st to 15thDay
15%9%35%5%35%5%5%5%36%
2151
16th to endDay
21%11%26%5%24445%30%
2340
May1st to 15thDay
20%8%47%6%35%5%45%29%
2454
16th to endDay
15%6%26%5%35%5%6%8%35%
2617
June1st to 15thDay
15%6%25%5%2446%8%37%
2646
16th to endDay
11%5%245%25%6%7%9%38%
2700
July1st to 15thDay
7%3245%35%45%8%47%
2700
16th to endDay
6%4245%345%6%10%46%
2667
August1st to 15thDay
8%5%26%5%45%5%5%9%41%
2340
16th to endDay
13%6%2342435%8%44%
2448
September1st to 15thDay
10%4244245%49%46%
2160
16th to endDay
15%6%2443445%7%41%
1824
October1st to 15thDay
16%9%25%5%23337%39%
1650
16th to endDay
21%9%45%5%33345%32%
1744
November1st to 15thDay
13%12%47%5%24435%36%
1407
16th to endDay
16%11%6%9%6%35%45%5%24%
1440
December1st to 15thDay
13%13%5%8%7%6%6%45%422%
1440
16th to endDay
15%17%7%13%8%2433419%
1382
January1st to 15thNight
10%9%5%11%7%36%5%6%7%27%
2676
16th to endNight
11%13%5%11%6%25%5%6%7%23%
2552
February1st to 15thNight
5%11%5%8%5%3435%8%35%
2278
16th to endNight
8%11%48%7%45%5%6%7%31%
2051
March1st to 15thNight
11%10%46%6%34445%37%
2001
16th to endNight
15%9%47%6%25%5%45%33%
2112
April1st to 15thNight
16%10%45%32444439%
1796
16th to endNight
21%9%47%42343433%
1620
May1st to 15thNight
19%8%35%423246%39%
1496
16th to endNight
12%4245%35%5%6%6%41%
1496
June1st to 15thNight
12%41432346%9%45%
1312
16th to endNight
9%42442345%11%48%
1260
July1st to 15thNight
5%32432446%9%54%
1260
16th to endNight
431342445%7%56%
1499
August1st to 15thNight
7%32242435%10%51%
1620
16th to endNight
9%314323347%55%
1752
September1st to 15thNight
8%324423448%54%
1800
16th to endNight
12%5%2342335%6%50%
1867
October1st to 15thNight
13%8%24423347%45%
1980
16th to endNight
19%10%36%423346%34%
2128
November1st to 15thNight
12%10%47%5%34445%36%
2451
16th to endNight
15%8%49%6%3446%6%29%
2520
December1st to 15thNight
13%12%6%10%8%35%5%46%22%
2520
16th to endNight
15%17%7%11%8%33345%18%
2838

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 15thDay
9%12%8%9%7%45%5%5%8%23%
1260
16th to endDay
9%12%7%11%8%46%5%5%6%21%
1671
February1st to 15thDay
8%10%5%9%8%45%5%6%7%29%
1575
16th to endDay
11%11%49%9%35%6%46%26%
1422
March1st to 15thDay
14%8%48%5%35%45%6%32%
1971
16th to endDay
19%9%37%5%3435%6%31%
2110
April1st to 15thDay
15%9%35%435%45%6%35%
2151
16th to endDay
21%11%36%5%34445%30%
2340
May1st to 15thDay
19%8%47%5%35%445%29%
2454
16th to endDay
15%6%25%5%25%6%5%8%35%
2617
June1st to 15thDay
15%6%35%5%25%46%8%36%
2646
16th to endDay
11%5%245%35%6%7%9%38%
2700
July1st to 15thDay
7%3245%35%5%6%8%47%
2700
16th to endDay
6%4145%345%7%10%46%
2667
August1st to 15thDay
8%435%6%45%5%5%8%42%
2340
16th to endDay
13%5%2342435%8%45%
2448
September1st to 15thDay
9%5%25%42445%8%46%
2160
16th to endDay
15%6%3443345%6%41%
1824
October1st to 15thDay
17%9%25%5%23346%40%
1650
16th to endDay
21%9%46%5%33335%31%
1744
November1st to 15thDay
13%12%47%5%24345%36%
1407
16th to endDay
16%12%5%9%7%35%45%7%23%
1440
December1st to 15thDay
13%13%6%8%8%6%6%5%5%421%
1440
16th to endDay
15%16%7%13%7%3433419%
1382
January1st to 15thNight
9%10%5%11%7%46%5%5%7%27%
2676
16th to endNight
11%13%5%11%5%3447%7%23%
2552
February1st to 15thNight
6%11%5%9%5%3435%8%35%
2278
16th to endNight
8%11%48%7%45%5%5%8%30%
2051
March1st to 15thNight
11%10%5%6%6%3445%5%36%
2001
16th to endNight
14%9%47%6%245%5%5%33%
2112
April1st to 15thNight
16%10%35%334435%38%
1796
16th to endNight
20%10%47%42433433%
1620
May1st to 15thNight
19%7%45%413346%38%
1496
16th to endNight
12%4245%35%5%6%7%41%
1496
June1st to 15thNight
12%4143235%6%9%45%
1312
16th to endNight
9%42433345%11%47%
1260
July1st to 15thNight
5%22432346%8%54%
1260
16th to endNight
431442446%7%55%
1499
August1st to 15thNight
7%32342446%9%51%
1620
16th to endNight
9%324323347%54%
1752
September1st to 15thNight
7%315%42345%7%54%
1800
16th to endNight
12%5%13423347%50%
1867
October1st to 15thNight
13%8%24423247%45%
1980
16th to endNight
19%10%35%424346%34%
2128
November1st to 15thNight
12%10%47%5%34446%36%
2451
16th to endNight
15%9%48%7%345%6%5%29%
2520
December1st to 15thNight
13%12%6%10%8%45%5%46%22%
2520
16th to endNight
15%17%7%11%8%34345%18%
2838

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 15thDay
57%6%9%19%6%
1261
16th to endDay
60%6%12%16%4
1671
February1st to 15thDay
52%5%13%20%7%
1576
16th to endDay
56%7%11%18%6%
1422
March1st to 15thDay
50%7%14%19%7%
1971
16th to endDay
54%6%11%23%3
2112
April1st to 15thDay
48%5%12%20%12%1
2151
16th to endDay
55%5%10%16%10%
2340
May1st to 15thDay
56%6%9%20%6%
2454
16th to endDay
45%7%12%23%9%
2621
June1st to 15thDay
44%7%17%23%7%
2646
16th to endDay
39%9%14%26%9%
2700
July1st to 15thDay
32%7%14%28%15%1
2541
16th to endDay
31%8%18%26%13%1
2500
August1st to 15thDay
36%7%15%28%10%1
2326
16th to endDay
37%6%15%25%13%1
2448
September1st to 15thDay
34%8%14%33%8%
2160
16th to endDay
41%8%13%30%5%
1824
October1st to 15thDay
45%6%13%23%9%1
1650
16th to endDay
54%413%19%7%
1744
November1st to 15thDay
49%6%12%20%10%
1407
16th to endDay
59%7%11%13%7%
1440
December1st to 15thDay
63%6%11%14%4
1440
16th to endDay
68%5%8%10%6%
1382
January1st to 15thNight
54%5%11%19%7%
2676
16th to endNight
57%5%12%17%6%
2552
February1st to 15thNight
46%6%13%24%9%
2288
16th to endNight
49%7%11%21%9%
2051
March1st to 15thNight
48%5%16%19%9%
2001
16th to endNight
51%6%13%22%5%
2112
April1st to 15thNight
46%5%10%20%14%1
1796
16th to endNight
53%5%8%17%13%1
1620
May1st to 15thNight
47%5%12%23%10%
1497
16th to endNight
39%8%12%22%15%1
1498
June1st to 15thNight
34%7%18%27%10%1
1312
16th to endNight
31%6%17%27%13%2
1260
July1st to 15thNight
26%7%15%31%16%2
1190
16th to endNight
24%7%17%30%17%3
1403
August1st to 15thNight
27%7%13%35%12%3
1610
16th to endNight
28%6%14%30%17%2
1752
September1st to 15thNight
28%6%14%36%13%
1800
16th to endNight
33%6%15%34%10%
1867
October1st to 15thNight
40%411%30%12%1
1980
16th to endNight
51%5%12%20%9%
2128
November1st to 15thNight
48%6%10%23%10%1
2451
16th to endNight
52%7%15%15%6%1
2520
December1st to 15thNight
61%6%11%16%4
2520
16th to endNight
67%5%9%12%4
2838

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 15thDay
18%7%34%26%10%2
90
16th to endDay
22%231%29%13%1
96
February1st to 15thDay
17%17%41%21%2
90
16th to endDay
20%7%44%20%41
81
March1st to 15thDay
21%8%31%28%7%2
90
16th to endDay
23%7%28%25%15%
96
April1st to 15thDay
17%8%35%24%11%1
270
16th to endDay
28%8%28%22%10%1
450
May1st to 15thDay
25%11%30%21%8%2
468
16th to endDay
20%8%27%26%12%5%
517
June1st to 15thDay
17%6%31%28%14%2
495
16th to endDay
13%7%35%24%14%5%
495
July1st to 15thDay
8%5%24%28%25%8%
475
16th to endDay
7%5%25%32%23%5%
515
August1st to 15thDay
10%221%32%29%4
493
16th to endDay
14%5%24%29%20%4
488
September1st to 15thDay
9%426%31%22%4
315
16th to endDay
22%6%30%25%12%2
108
October1st to 15thDay
10%11%33%26%13%5%
90
16th to endDay
30%6%33%15%13%1
96
November1st to 15thDay
12%5%36%33%10%2
90
16th to endDay
41%5%27%20%41
90
December1st to 15thDay
14%7%43%27%6%
90
16th to endDay
27%10%31%26%32
96
January1st to 15thNight
13%10%34%28%9%2
900
16th to endNight
17%10%38%27%6%
960
February1st to 15thNight
11%9%35%31%10%1
880
16th to endNight
13%8%37%26%11%1
789
March1st to 15thNight
16%8%35%29%8%1
561
16th to endNight
19%7%32%28%9%2
576
April1st to 15thNight
21%6%31%31%8%
539
16th to endNight
26%329%30%8%
540
May1st to 15thNight
21%7%35%25%8%1
540
16th to endNight
14%5%32%33%12%1
563
June1st to 15thNight
14%328%41%10%
540
16th to endNight
11%424%41%16%
540
July1st to 15thNight
7%225%41%20%1
510
16th to endNight
5%125%43%21%1
564
August1st to 15thNight
8%18%43%24%3
539
16th to endNight
10%326%34%22%2
573
September1st to 15thNight
8%423%38%22%2
540
16th to endNight
14%6%32%27%16%2
526
October1st to 15thNight
19%10%29%27%12%1
660
16th to endNight
25%5%31%31%5%
712
November1st to 15thNight
17%9%34%28%8%
875
16th to endNight
19%12%34%23%9%
900
December1st to 15thNight
18%10%34%28%6%
900
16th to endNight
23%8%33%24%8%1
960
Page generated at 2017-09-20 03:49:56. Version ac04

Copyright 2017 A. Danko


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