Big Bend City(MN)
Clear Sky Chart
History

This sumarizes the distribution of each different forecast outcome for the Big Bend City(MN) clear sky chart from 2005-11-05 to 2017-09-16.

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
40%
16134
17%
46719
10%
16087
46%
16087
26%
30579

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
34%
900
13%
2646
7%
895
40%
895
20%
1862
January16th to endNight
30%
960
13%
2529
5%
960
35%
960
18%
1908
February1st to 15thNight
34%
879
11%
2288
4%
875
38%
875
21%
1664
February16th to endNight
34%
744
15%
2006
6%
744
40%
744
23%
1430
March1st to 15thNight
36%
575
16%
2015
11%
575
43%
575
21%
1317
March16th to endNight
32%
576
15%
2112
13%
576
39%
576
18%
1400
April1st to 15thNight
34%
539
19%
1801
15%
539
43%
539
23%
1130
April16th to endNight
32%
540
18%
1620
13%
540
41%
540
20%
1131
May1st to 15thNight
35%
540
15%
1584
9%
540
40%
540
25%
1056
May16th to endNight
42%
563
14%
1498
6%
561
46%
561
30%
974
June1st to 15thNight
44%
540
16%
1284
5%
540
49%
540
39%
815
June16th to endNight
57%
540
19%
1260
7%
540
61%
540
53%
736
July1st to 15thNight
63%
510
19%
1190
7%
510
65%
510
55%
681
July16th to endNight
66%
564
21%
1471
11%
531
69%
531
52%
760
August1st to 15thNight
66%
539
22%
1610
18%
536
69%
536
39%
892
August16th to endNight
63%
573
26%
1722
27%
573
69%
573
44%
917
September1st to 15thNight
58%
540
23%
1857
21%
540
67%
540
38%
960
September16th to endNight
45%
492
25%
1817
19%
492
58%
492
32%
964
October1st to 15thNight
37%
643
24%
1963
16%
643
44%
643
31%
1161
October16th to endNight
38%
742
19%
2150
11%
742
44%
742
26%
1410
November1st to 15thNight
38%
875
21%
2385
10%
875
46%
875
29%
1551
November16th to endNight
34%
900
16%
2520
10%
900
38%
900
23%
1729
December1st to 15thNight
32%
900
10%
2520
6%
900
36%
900
18%
1884
December16th to endNight
26%
960
11%
2871
6%
960
32%
960
13%
2247

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%7%35%5%3445%7%39%
48021
Night
11%7%36%5%3445%6%41%
46887
Cloud CoverDay
13%7%35%5%3445%7%39%
48031
Night
11%7%35%5%34446%42%
46890
Cloud CoverDay
13%7%35%5%3445%7%39%
48032
Night
11%7%36%5%24446%41%
46891
Cloud CoverDay
13%7%35%5%2445%7%39%
48030
Night
11%7%35%5%3445%6%41%
46891
TransparencyDay
43%414%24%10%1
47707
Night
42%414%25%11%1
46719
SeeingDay
15%6%27%30%15%3
6132
Night
15%6%29%35%12%1
16135

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%11%6%9%7%5%5%45%7%28%
1290
16th to endDay
9%12%6%10%7%46%5%6%6%24%
1692
February1st to 15thDay
8%12%5%8%8%45%6%5%7%26%
1575
16th to endDay
9%10%48%9%5%5%6%6%9%24%
1479
March1st to 15thDay
12%11%46%7%345%5%6%31%
1933
16th to endDay
17%10%48%5%25%46%6%28%
2112
April1st to 15thDay
17%7%2442335%7%38%
2145
16th to endDay
23%11%345%23345%32%
2340
May1st to 15thDay
20%7%36%5%23346%35%
2364
16th to endDay
15%6%35%425%5%5%9%36%
2617
June1st to 15thDay
16%6%24436%45%6%37%
2673
16th to endDay
7%423425%5%6%8%49%
2700
July1st to 15thDay
5%21342446%8%54%
2700
16th to endDay
5%31442446%10%53%
2588
August1st to 15thDay
8%425%5%36%5%6%7%43%
2340
16th to endDay
11%314334446%52%
2480
September1st to 15thDay
10%32342435%7%51%
2100
16th to endDay
14%42331435%7%49%
1815
October1st to 15thDay
16%6%2442335%6%44%
1656
16th to endDay
19%7%24414447%39%
1720
November1st to 15thDay
11%7%37%434346%43%
1472
16th to endDay
14%9%46%6%3445%7%33%
1440
December1st to 15thDay
12%12%6%8%7%35%446%26%
1440
16th to endDay
16%15%6%8%8%24446%24%
1350
January1st to 15thNight
7%8%5%8%7%36%6%7%7%31%
2646
16th to endNight
10%11%6%9%5%46%6%6%6%26%
2529
February1st to 15thNight
8%11%48%6%35%5%5%7%33%
2285
16th to endNight
8%8%48%7%36%5%46%35%
2006
March1st to 15thNight
12%9%46%424345%39%
2003
16th to endNight
14%8%46%5%33446%35%
2112
April1st to 15thNight
16%7%34423446%41%
1801
16th to endNight
19%8%45%43433437%
1620
May1st to 15thNight
17%6%25%423347%40%
1584
16th to endNight
12%4235%35%5%7%8%40%
1496
June1st to 15thNight
11%5%23414447%49%
1284
16th to endNight
5%213323447%62%
1260
July1st to 15thNight
421321437%9%58%
1260
16th to endNight
311232445%9%61%
1576
August1st to 15thNight
6%315%43445%6%55%
1620
16th to endNight
8%313322436%60%
1722
September1st to 15thNight
9%31332335%6%57%
1857
16th to endNight
11%424323246%55%
1817
October1st to 15thNight
14%6%24323337%49%
1963
16th to endNight
16%9%24424346%42%
2150
November1st to 15thNight
10%7%45%424447%44%
2385
16th to endNight
11%8%36%6%345%46%38%
2520
December1st to 15thNight
13%10%47%7%45%446%30%
2520
16th to endNight
16%14%6%9%7%33445%24%
2871

Percentage Cloud Cover NW (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%11%6%10%6%45%46%7%27%
1291
16th to endDay
9%13%6%9%7%45%5%6%6%25%
1692
February1st to 15thDay
9%12%5%8%8%5%6%6%47%25%
1575
16th to endDay
9%9%5%8%9%45%6%6%9%24%
1479
March1st to 15thDay
13%11%46%6%3445%7%31%
1944
16th to endDay
17%10%47%6%35%45%6%28%
2110
April1st to 15thDay
18%7%25%424347%39%
2145
16th to endDay
23%10%35%5%23345%32%
2340
May1st to 15thDay
21%6%45%5%34346%35%
2364
16th to endDay
15%5%25%5%25%45%8%37%
2617
June1st to 15thDay
16%5%25%435%5%5%6%38%
2673
16th to endDay
8%3234345%6%8%49%
2700
July1st to 15thDay
5%31332446%9%55%
2700
16th to endDay
5%21442446%10%53%
2588
August1st to 15thDay
8%425%5%36%46%7%44%
2340
16th to endDay
11%313324446%53%
2480
September1st to 15thDay
11%31333345%8%51%
2100
16th to endDay
14%413313447%50%
1815
October1st to 15thDay
15%6%24413446%45%
1656
16th to endDay
19%6%25%324346%40%
1720
November1st to 15thDay
11%8%27%424345%44%
1472
16th to endDay
14%10%47%5%25%45%6%33%
1440
December1st to 15thDay
12%12%5%9%7%45%446%27%
1440
16th to endDay
17%13%6%8%8%34336%25%
1350
January1st to 15thNight
7%8%5%8%7%45%6%7%7%31%
2646
16th to endNight
10%11%6%9%6%5%5%6%6%6%27%
2529
February1st to 15thNight
8%11%48%6%445%5%6%33%
2278
16th to endNight
8%8%48%6%36%45%6%36%
2006
March1st to 15thNight
12%8%5%6%42445%5%39%
2015
16th to endNight
15%8%47%5%34446%35%
2110
April1st to 15thNight
16%7%34423447%41%
1801
16th to endNight
20%8%36%5%2433438%
1620
May1st to 15thNight
18%6%35%323346%41%
1583
16th to endNight
11%4235%35%5%6%9%40%
1497
June1st to 15thNight
11%5%2342445%6%50%
1284
16th to endNight
5%31331335%7%62%
1260
July1st to 15thNight
421231436%10%59%
1260
16th to endNight
321232445%9%60%
1576
August1st to 15thNight
6%314424437%55%
1620
16th to endNight
8%313322336%61%
1722
September1st to 15thNight
9%31232335%5%58%
1857
16th to endNight
11%423313246%55%
1817
October1st to 15thNight
14%5%14323346%49%
1963
16th to endNight
17%8%24323346%41%
2150
November1st to 15thNight
10%7%35%424447%44%
2385
16th to endNight
11%8%37%6%345%46%39%
2520
December1st to 15thNight
13%11%36%7%45%5%46%30%
2520
16th to endNight
16%14%6%9%8%24435%24%
2871

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
8%11%7%8%7%45%45%7%28%
1290
16th to endDay
9%13%5%9%7%46%5%6%6%24%
1692
February1st to 15thDay
8%13%5%8%8%46%6%5%6%26%
1575
16th to endDay
9%10%49%8%6%5%6%6%8%24%
1479
March1st to 15thDay
13%11%46%7%3445%6%31%
1944
16th to endDay
17%9%48%5%35%36%6%28%
2112
April1st to 15thDay
17%7%2442335%7%38%
2145
16th to endDay
23%10%345%23335%32%
2340
May1st to 15thDay
20%7%36%5%23347%34%
2364
16th to endDay
15%6%35%5%25%5%5%8%36%
2617
June1st to 15thDay
17%5%25%5%35%46%6%37%
2673
16th to endDay
8%323425%5%5%8%50%
2700
July1st to 15thDay
5%22332446%8%55%
2700
16th to endDay
5%3235%2446%9%53%
2588
August1st to 15thDay
8%425%5%46%46%7%43%
2340
16th to endDay
11%31432445%6%52%
2480
September1st to 15thDay
11%32432345%7%51%
2100
16th to endDay
14%42332345%8%49%
1815
October1st to 15thDay
16%5%3332335%6%44%
1656
16th to endDay
19%7%25%413447%39%
1720
November1st to 15thDay
11%7%36%424345%44%
1472
16th to endDay
15%9%46%6%3445%7%32%
1440
December1st to 15thDay
12%12%5%9%7%35%45%6%26%
1440
16th to endDay
16%15%6%9%7%23446%24%
1350
January1st to 15thNight
7%8%5%8%7%36%6%7%7%31%
2646
16th to endNight
10%12%5%9%6%46%6%6%6%26%
2529
February1st to 15thNight
8%12%49%6%35%5%47%33%
2278
16th to endNight
8%8%48%7%36%5%46%35%
2006
March1st to 15thNight
13%8%5%6%5%24446%39%
2015
16th to endNight
15%8%46%5%24446%36%
2112
April1st to 15thNight
16%7%34423446%41%
1801
16th to endNight
20%8%35%43433437%
1620
May1st to 15thNight
18%7%34424346%41%
1583
16th to endNight
12%4235%35%6%7%8%40%
1496
June1st to 15thNight
11%5%23414447%49%
1284
16th to endNight
5%213323447%62%
1260
July1st to 15thNight
421322437%9%58%
1260
16th to endNight
311222345%9%60%
1576
August1st to 15thNight
6%315%424446%55%
1620
16th to endNight
7%313322345%60%
1722
September1st to 15thNight
9%313314346%57%
1857
16th to endNight
11%424322346%54%
1817
October1st to 15thNight
14%6%15%222336%49%
1963
16th to endNight
17%9%24423346%42%
2150
November1st to 15thNight
9%7%45%4335%47%44%
2385
16th to endNight
11%8%36%5%345%46%38%
2520
December1st to 15thNight
13%10%47%7%45%446%30%
2520
16th to endNight
16%14%5%9%7%3444424%
2871

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
8%11%7%8%7%45%46%7%28%
1290
16th to endDay
8%13%6%9%8%45%5%6%7%23%
1692
February1st to 15thDay
8%12%6%8%7%5%6%6%47%25%
1575
16th to endDay
9%11%48%9%47%6%6%8%23%
1479
March1st to 15thDay
12%10%47%7%3445%7%32%
1944
16th to endDay
17%10%47%5%3445%6%27%
2110
April1st to 15thDay
17%7%25%42345%7%39%
2145
16th to endDay
23%11%25%5%23335%31%
2340
May1st to 15thDay
20%8%35%6%24336%34%
2364
16th to endDay
15%6%26%5%25%45%8%36%
2617
June1st to 15thDay
16%5%25%6%345%5%7%37%
2673
16th to endDay
8%323435%5%5%8%49%
2700
July1st to 15thDay
6%21342447%8%54%
2700
16th to endDay
5%3144245%6%10%53%
2588
August1st to 15thDay
8%425%5%35%5%6%8%43%
2340
16th to endDay
11%31342445%6%52%
2480
September1st to 15thDay
10%32432445%7%51%
2100
16th to endDay
14%42331345%7%49%
1815
October1st to 15thDay
15%6%24423446%43%
1656
16th to endDay
19%7%35%42445%6%38%
1720
November1st to 15thDay
11%8%37%5%32446%43%
1472
16th to endDay
15%9%46%6%34447%33%
1440
December1st to 15thDay
11%13%5%8%8%26%5%5%6%26%
1440
16th to endDay
16%14%6%9%7%24445%23%
1350
January1st to 15thNight
7%9%5%9%7%36%6%7%7%31%
2646
16th to endNight
9%12%5%9%6%45%5%6%6%26%
2529
February1st to 15thNight
7%11%5%8%7%35%5%47%33%
2278
16th to endNight
8%8%47%7%45%5%5%6%35%
2006
March1st to 15thNight
12%9%47%5%24346%38%
2015
16th to endNight
14%9%37%5%24446%36%
2112
April1st to 15thNight
15%8%34424347%41%
1801
16th to endNight
20%8%36%425%32437%
1620
May1st to 15thNight
17%8%24423346%40%
1583
16th to endNight
12%414435%6%7%10%40%
1496
June1st to 15thNight
12%4243235%47%48%
1284
16th to endNight
5%21232435%6%61%
1260
July1st to 15thNight
43232347%9%58%
1260
16th to endNight
31122335%5%9%60%
1576
August1st to 15thNight
6%41432445%6%54%
1620
16th to endNight
7%313313345%61%
1722
September1st to 15thNight
8%313323347%57%
1857
16th to endNight
10%42332325%5%55%
1817
October1st to 15thNight
14%6%24313236%50%
1963
16th to endNight
17%8%3342335%6%41%
2150
November1st to 15thNight
10%7%35%434447%43%
2385
16th to endNight
11%8%45%6%34446%38%
2520
December1st to 15thNight
12%11%47%7%45%446%29%
2520
16th to endNight
16%15%6%9%7%35%435%23%
2871

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
54%416%16%7%
1291
16th to endDay
58%318%16%2
1692
February1st to 15thDay
57%415%18%4
1576
16th to endDay
55%6%14%16%6%
1479
March1st to 15thDay
51%5%16%20%5%
1944
16th to endDay
55%415%19%3
2112
April1st to 15thDay
45%312%25%11%1
2145
16th to endDay
55%211%19%9%
2340
May1st to 15thDay
50%311%23%9%
2364
16th to endDay
44%5%14%24%10%
2621
June1st to 15thDay
44%5%14%24%9%
2673
16th to endDay
30%6%16%30%14%2
2700
July1st to 15thDay
24%5%17%32%17%2
2541
16th to endDay
26%6%16%31%17%2
2430
August1st to 15thDay
36%6%12%30%11%3
2326
16th to endDay
31%415%31%14%2
2480
September1st to 15thDay
31%415%33%13%
2100
16th to endDay
34%315%31%13%
1815
October1st to 15thDay
39%414%25%14%1
1656
16th to endDay
44%5%14%25%10%
1720
November1st to 15thDay
42%312%25%14%1
1472
16th to endDay
50%5%17%17%7%1
1440
December1st to 15thDay
58%5%13%15%7%
1440
16th to endDay
62%212%14%6%
1350
January1st to 15thNight
49%5%15%20%8%
2646
16th to endNight
55%414%19%5%
2529
February1st to 15thNight
50%5%16%19%8%
2288
16th to endNight
48%5%12%20%11%
2006
March1st to 15thNight
46%415%24%7%
2015
16th to endNight
49%414%26%5%
2112
April1st to 15thNight
43%311%28%11%
1801
16th to endNight
51%38%21%13%2
1620
May1st to 15thNight
44%411%24%13%1
1584
16th to endNight
38%6%14%23%14%2
1498
June1st to 15thNight
34%316%30%13%1
1284
16th to endNight
22%417%32%18%4
1260
July1st to 15thNight
20%415%36%17%4
1190
16th to endNight
19%418%34%18%4
1471
August1st to 15thNight
27%5%13%33%14%4
1610
16th to endNight
26%313%34%19%3
1722
September1st to 15thNight
27%314%34%19%1
1857
16th to endNight
31%311%34%17%
1817
October1st to 15thNight
36%312%28%17%2
1963
16th to endNight
44%214%26%11%
2150
November1st to 15thNight
39%413%23%16%1
2385
16th to endNight
45%419%18%9%1
2520
December1st to 15thNight
54%5%15%17%6%
2520
16th to endNight
63%312%15%5%
2871

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
13%8%25%32%15%4
90
16th to endDay
25%7%25%29%11%2
96
February1st to 15thDay
17%14%37%26%3
90
16th to endDay
16%9%35%29%8%
81
March1st to 15thDay
18%11%36%31%2
90
16th to endDay
20%9%30%21%13%4
96
April1st to 15thDay
22%14%25%22%12%1
264
16th to endDay
27%12%26%22%9%1
450
May1st to 15thDay
22%8%32%24%10%2
468
16th to endDay
19%7%28%30%9%3
517
June1st to 15thDay
15%7%29%30%14%2
495
16th to endDay
7%5%34%33%14%4
495
July1st to 15thDay
6%327%33%22%6%
475
16th to endDay
5%324%42%20%3
515
August1st to 15thDay
10%320%34%26%5%
493
16th to endDay
13%322%29%24%7%
520
September1st to 15thDay
12%326%33%19%5%
255
16th to endDay
18%7%23%27%15%6%
90
October1st to 15thDay
11%10%40%24%10%4
90
16th to endDay
17%8%33%25%11%4
96
November1st to 15thDay
11%322%43%14%5%
90
16th to endDay
43%6%23%17%8%
90
December1st to 15thDay
15%6%41%25%11%
90
16th to endDay
28%15%26%23%6%
96
January1st to 15thNight
12%9%32%33%11%1
900
16th to endNight
17%9%31%34%7%
960
February1st to 15thNight
14%9%31%32%10%1
880
16th to endNight
11%8%34%30%13%1
744
March1st to 15thNight
17%6%32%33%9%
575
16th to endNight
17%7%31%32%9%1
576
April1st to 15thNight
21%9%30%29%9%
539
16th to endNight
24%5%30%29%9%1
540
May1st to 15thNight
20%7%33%30%7%
540
16th to endNight
15%5%29%37%11%
563
June1st to 15thNight
12%6%30%37%12%
540
16th to endNight
7%228%47%13%
540
July1st to 15thNight
6%222%44%22%
510
16th to endNight
423%49%20%1
564
August1st to 15thNight
8%215%47%24%1
539
16th to endNight
8%319%42%23%3
573
September1st to 15thNight
10%224%39%21%1
540
16th to endNight
13%432%31%16%2
492
October1st to 15thNight
17%8%32%28%12%
643
16th to endNight
22%7%26%34%9%
742
November1st to 15thNight
14%8%31%32%12%
875
16th to endNight
15%11%31%30%10%
900
December1st to 15thNight
18%7%29%35%8%
900
16th to endNight
24%7%26%31%8%1
960
Page generated at 2017-09-16 16:07:00. Version ac04

Copyright 2017 A. Danko


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