Minot
Clear Sky Chart
History

This sumarizes the distribution of each different forecast outcome for the Minot 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
36%
25202
15%
80485
8%
25112
43%
25112
22%
53022

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
25%
938
12%
4458
6%
926
33%
926
12%
3010
January11th to 20thNight
23%
947
11%
4360
5%
930
29%
930
10%
3073
January21st to endNight
22%
1038
10%
4710
5%
1023
28%
1023
10%
3188
February1st to 10thNight
26%
950
11%
2660
4%
950
32%
950
16%
2012
February11th to 20thNight
27%
800
15%
2312
5%
800
34%
800
19%
1661
February21st to endNight
35%
592
19%
1776
9%
592
43%
592
24%
1200
March1st to 10thNight
28%
720
9%
2160
5%
720
32%
720
16%
1634
March11th to 20thNight
34%
635
19%
2075
11%
635
43%
635
23%
1339
March21st to endNight
35%
594
14%
2054
11%
594
43%
594
20%
1397
April1st to 10thNight
34%
540
20%
1800
13%
540
46%
540
24%
1114
April11th to 20thNight
32%
533
15%
1667
10%
533
41%
533
20%
1140
April21st to endNight
37%
540
15%
1620
12%
540
43%
540
26%
1072
May1st to 10thNight
45%
540
15%
1528
9%
540
48%
540
30%
981
May11th to 20thNight
45%
531
16%
1417
7%
531
48%
531
29%
936
May21st to endNight
42%
584
12%
1408
5%
582
44%
582
29%
976
June1st to 10thNight
45%
540
11%
1260
5%
540
48%
540
36%
850
June11th to 20thNight
42%
540
9%
1260
5%
540
45%
540
34%
855
June21st to endNight
52%
540
11%
1260
6%
540
56%
540
40%
820
July1st to 10thNight
62%
525
13%
1229
9%
525
64%
525
51%
719
July11th to 20thNight
56%
522
15%
1392
7%
522
60%
522
45%
797
July21st to endNight
63%
591
20%
1488
11%
558
65%
558
50%
818
August1st to 10thNight
62%
537
21%
1424
13%
534
65%
534
45%
799
August11th to 20thNight
57%
534
23%
1557
15%
534
65%
534
40%
861
August21st to endNight
57%
594
28%
1857
24%
594
67%
594
45%
934
September1st to 10thNight
50%
540
23%
1800
18%
540
62%
540
38%
953
September11th to 20thNight
47%
540
22%
1934
20%
540
57%
540
31%
1063
September21st to endNight
40%
540
24%
1980
18%
540
51%
540
26%
1136
October1st to 10thNight
35%
559
22%
1999
15%
559
45%
559
24%
1221
October11th to 20thNight
37%
871
20%
2311
9%
871
43%
871
28%
1532
October21st to endNight
30%
990
20%
2574
6%
990
38%
990
27%
1716
November1st to 10thNight
30%
925
19%
2405
6%
925
38%
925
23%
1683
November11th to 20thNight
29%
950
18%
2588
7%
950
36%
950
21%
1865
November21st to endNight
24%
950
14%
2850
4%
950
33%
950
19%
1971
December1st to 10thNight
26%
950
11%
2850
4%
950
33%
950
18%
2043
December11th to 20thNight
22%
949
12%
3436
4%
948
31%
948
13%
2482
December21st to endNight
24%
1033
9%
5026
6%
1026
31%
1026
9%
3171

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
10%8%47%6%35%5%6%7%39%
78012
Night
8%8%48%6%45%5%5%7%40%
81228
TransparencyDay
43%7%15%24%11%1
77710
Night
43%6%14%24%12%1
81052
SeeingDay
13%9%32%30%14%3
15075
Night
12%8%35%33%11%1
25241

By Month

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 10thDay
411%6%11%13%6%5%5%6%7%26%
2442
11th to 20thDay
37%5%11%11%7%12%12%6%6%19%
2540
21st to endDay
5%9%5%13%8%45%5%6%5%33%
2794
February1st to 10thDay
8%12%8%9%8%5%7%46%5%27%
1520
11th to 20thDay
8%12%410%10%6%8%5%5%7%25%
1753
21st to endDay
7%10%7%13%8%5%6%5%46%30%
1480
March1st to 10thDay
9%15%8%11%8%35%5%5%6%25%
1800
11th to 20thDay
9%10%38%7%45%5%5%8%37%
1885
21st to endDay
13%12%6%9%7%345%6%7%27%
2299
April1st to 10thDay
9%10%47%6%35%5%6%8%37%
2160
11th to 20thDay
15%11%48%7%45%445%32%
2240
21st to endDay
17%8%36%6%45%5%5%6%35%
2340
May1st to 10thDay
14%8%36%6%35%5%5%6%39%
2430
11th to 20thDay
15%7%35%6%3446%7%39%
2478
21st to endDay
19%6%36%6%35%5%5%8%35%
2866
June1st to 10thDay
12%5%245%35%45%8%44%
2700
11th to 20thDay
11%435%6%46%6%7%10%37%
2700
21st to endDay
9%5%25%5%36%6%6%10%44%
2700
July1st to 10thDay
7%4245%345%6%9%52%
2692
11th to 20thDay
6%5%244346%7%8%52%
2520
21st to endDay
5%3234245%6%8%57%
2742
August1st to 10thDay
9%5%26%5%35%5%5%7%48%
2507
11th to 20thDay
8%4244346%7%9%50%
2344
21st to endDay
8%32432345%6%58%
2497
September1st to 10thDay
10%5%2443445%6%54%
2160
11th to 20thDay
12%42442435%8%52%
2026
21st to endDay
15%5%25%423346%51%
1980
October1st to 10thDay
17%9%36%424348%41%
1958
11th to 20thDay
12%10%36%6%3445%7%42%
1630
21st to endDay
13%12%49%5%35%45%6%33%
1782
November1st to 10thDay
13%12%48%5%44445%37%
1673
11th to 20thDay
8%11%5%10%7%445%5%6%35%
1589
21st to endDay
7%12%6%9%7%45%46%7%34%
1330
December1st to 10thDay
7%13%6%9%8%36%6%6%7%29%
1330
11th to 20thDay
8%16%6%13%5%36%5%6%7%25%
1683
21st to endDay
7%9%49%7%345%5%5%42%
2442
January1st to 10thNight
5%13%5%11%9%45%45%6%33%
4512
11th to 20thNight
48%5%11%10%6%10%8%7%7%24%
4430
21st to endNight
6%11%5%11%8%46%6%5%6%32%
4873
February1st to 10thNight
7%11%8%10%9%46%7%6%7%26%
2660
11th to 20thNight
7%11%5%10%7%5%7%6%5%6%32%
2312
21st to endNight
8%8%5%9%7%35%6%5%6%39%
1776
March1st to 10thNight
9%11%7%12%8%45%5%5%5%28%
2160
11th to 20thNight
7%9%47%6%35%5%6%7%40%
2075
21st to endNight
10%10%5%7%6%45%5%6%7%34%
2054
April1st to 10thNight
7%8%46%6%35%5%5%9%43%
1800
11th to 20thNight
13%11%36%5%35%6%6%7%35%
1667
21st to endNight
15%8%27%4245%5%8%39%
1620
May1st to 10thNight
11%6%25%6%35%5%6%7%43%
1528
11th to 20thNight
13%5%26%5%26%5%7%7%42%
1417
21st to endNight
16%5%25%5%4445%8%41%
1408
June1st to 10thNight
12%325%5%35%6%7%8%44%
1260
11th to 20thNight
11%4245%36%5%6%9%46%
1260
21st to endNight
6%324435%6%8%12%48%
1260
July1st to 10thNight
6%2133245%6%12%56%
1264
11th to 20thNight
6%32333446%9%59%
1440
21st to endNight
43223345%6%8%62%
1576
August1st to 10thNight
5%42442346%9%57%
1432
11th to 20thNight
5%413434449%57%
1557
21st to endNight
5%31342445%6%64%
1857
September1st to 10thNight
9%32343345%7%58%
1800
11th to 20thNight
10%424435%45%7%52%
1934
21st to endNight
14%6%25%424347%49%
1980
October1st to 10thNight
12%8%35%5%34446%46%
1999
11th to 20thNight
13%8%36%43446%7%43%
2311
21st to endNight
11%9%35%425%5%5%7%43%
2574
November1st to 10thNight
12%9%5%5%6%445%5%6%39%
2405
11th to 20thNight
7%11%5%9%7%45%5%5%7%34%
2588
21st to endNight
9%10%5%9%7%345%5%7%37%
2850
December1st to 10thNight
6%11%6%10%8%5%6%5%5%7%31%
2850
11th to 20thNight
8%12%5%10%9%46%5%5%6%30%
3514
21st to endNight
8%10%410%8%5%4445%38%
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%7%17%15%4
2443
11th to 20thDay
60%6%15%13%5%
2540
21st to endDay
52%412%23%9%
2794
February1st to 10thDay
57%5%12%20%6%1
1520
11th to 20thDay
58%7%11%15%9%
1763
21st to endDay
55%5%13%16%9%1
1480
March1st to 10thDay
60%6%15%14%5%
1800
11th to 20thDay
45%9%15%23%9%
1885
21st to endDay
55%7%14%17%6%1
2299
April1st to 10thDay
44%7%12%22%13%2
2160
11th to 20thDay
53%5%11%18%11%1
2243
21st to endDay
49%6%14%23%8%
2340
May1st to 10thDay
44%7%12%24%11%1
2430
11th to 20thDay
43%6%13%27%11%
2482
21st to endDay
47%7%14%23%8%1
2866
June1st to 10thDay
38%7%17%26%11%1
2700
11th to 20thDay
39%9%18%23%9%1
2700
21st to endDay
34%10%19%26%10%1
2700
July1st to 10thDay
27%7%19%33%12%2
2618
11th to 20thDay
28%7%16%30%15%3
2445
21st to endDay
23%8%16%33%19%1
2590
August1st to 10thDay
33%8%15%28%14%2
2491
11th to 20thDay
29%8%16%34%13%1
2344
21st to endDay
27%5%12%37%17%1
2497
September1st to 10thDay
31%7%12%31%17%1
2160
11th to 20thDay
32%6%16%28%17%1
2026
21st to endDay
36%6%13%30%14%1
1980
October1st to 10thDay
43%5%15%23%12%1
1958
11th to 20thDay
42%6%13%27%11%1
1630
21st to endDay
50%7%12%22%8%1
1782
November1st to 10thDay
49%5%13%21%10%2
1673
11th to 20thDay
49%5%17%19%8%1
1589
21st to endDay
50%7%17%18%7%1
1330
December1st to 10thDay
52%7%16%19%6%1
1330
11th to 20thDay
56%7%15%17%4
1680
21st to endDay
42%5%14%23%15%1
2442
January1st to 10thNight
51%6%13%21%8%
4512
11th to 20thNight
55%6%16%18%5%
4430
21st to endNight
51%7%14%20%7%
4873
February1st to 10thNight
56%6%11%17%9%1
2660
11th to 20thNight
50%7%12%20%10%1
2312
21st to endNight
44%6%14%22%12%1
1776
March1st to 10thNight
56%6%14%16%7%
2160
11th to 20thNight
42%6%15%24%13%
2075
21st to endNight
47%6%18%21%7%1
2054
April1st to 10thNight
39%7%12%24%16%2
1800
11th to 20thNight
47%7%11%21%12%2
1667
21st to endNight
42%6%15%24%11%1
1620
May1st to 10thNight
39%5%12%28%14%2
1528
11th to 20thNight
39%7%14%23%17%
1418
21st to endNight
42%6%16%25%10%1
1408
June1st to 10thNight
34%8%16%27%12%2
1260
11th to 20thNight
35%8%17%26%12%2
1260
21st to endNight
28%10%19%30%12%1
1260
July1st to 10thNight
20%8%18%36%16%2
1229
11th to 20thNight
23%8%15%33%17%3
1392
21st to endNight
20%7%14%35%20%3
1488
August1st to 10thNight
24%7%16%35%15%4
1424
11th to 20thNight
25%7%16%32%18%2
1557
21st to endNight
21%6%11%37%22%3
1857
September1st to 10thNight
26%6%11%31%23%3
1800
11th to 20thNight
31%6%16%26%18%2
1934
21st to endNight
37%410%32%15%1
1980
October1st to 10thNight
40%6%14%25%14%1
1999
11th to 20thNight
40%5%12%27%14%1
2311
21st to endNight
40%6%15%27%10%1
2574
November1st to 10thNight
44%7%12%21%13%2
2405
11th to 20thNight
48%7%14%23%7%1
2588
21st to endNight
47%7%17%20%8%1
2850
December1st to 10thNight
51%6%17%19%7%
2850
11th to 20thNight
54%6%15%18%6%1
3516
21st to endNight
49%5%9%20%15%1
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
10%9%36%30%12%4
270
11th to 20thDay
7%14%40%31%6%1
270
21st to endDay
12%12%33%28%12%2
297
February1st to 10thDay
10%9%44%31%6%
270
11th to 20thDay
10%11%43%27%9%1
267
21st to endDay
8%9%36%35%11%
198
March1st to 10thDay
13%11%38%26%10%2
240
11th to 20thDay
13%9%30%30%16%2
240
21st to endDay
16%10%35%28%10%2
385
April1st to 10thDay
14%15%40%23%6%1
420
11th to 20thDay
23%13%31%23%8%2
521
21st to endDay
20%9%31%27%13%1
600
May1st to 10thDay
15%10%27%33%14%2
603
11th to 20thDay
18%10%27%28%13%5%
625
21st to endDay
18%10%26%27%15%5%
679
June1st to 10thDay
12%8%31%28%17%4
630
11th to 20thDay
11%11%37%25%14%2
630
21st to endDay
10%9%29%37%13%3
630
July1st to 10thDay
8%426%40%19%3
621
11th to 20thDay
8%7%30%35%18%3
618
21st to endDay
5%430%34%23%4
684
August1st to 10thDay
8%5%25%34%22%5%
626
11th to 20thDay
10%323%34%24%6%
615
21st to endDay
8%8%25%33%20%5%
616
September1st to 10thDay
11%11%32%29%14%3
450
11th to 20thDay
14%7%28%33%16%1
316
21st to endDay
18%11%34%26%10%2
270
October1st to 10thDay
24%10%27%25%11%3
270
11th to 20thDay
13%17%30%26%11%2
270
21st to endDay
19%13%41%21%41
297
November1st to 10thDay
22%12%33%21%12%
270
11th to 20thDay
12%14%35%32%6%
270
21st to endDay
13%12%37%27%11%1
270
December1st to 10thDay
9%13%45%20%11%2
270
11th to 20thDay
15%15%41%22%6%1
270
21st to endDay
12%11%39%26%9%3
297
January1st to 10thNight
11%11%43%28%8%
950
11th to 20thNight
12%12%39%29%7%1
950
21st to endNight
11%11%39%30%9%
1045
February1st to 10thNight
12%12%37%31%8%1
950
11th to 20thNight
12%8%40%29%9%2
804
21st to endNight
11%7%36%33%10%3
592
March1st to 10thNight
13%10%35%32%9%2
720
11th to 20thNight
11%9%38%31%10%1
635
21st to endNight
15%6%35%29%12%2
594
April1st to 10thNight
10%10%39%33%8%
540
11th to 20thNight
17%10%34%32%7%1
533
21st to endNight
17%7%31%34%10%1
540
May1st to 10thNight
14%429%36%16%
540
11th to 20thNight
16%7%28%38%11%
531
21st to endNight
17%6%28%35%13%1
584
June1st to 10thNight
12%6%33%33%15%
540
11th to 20thNight
13%6%34%35%11%
540
21st to endNight
7%431%42%15%
540
July1st to 10thNight
6%325%45%21%1
525
11th to 20thNight
6%332%44%14%1
522
21st to endNight
5%227%48%17%1
591
August1st to 10thNight
7%323%49%17%1
537
11th to 20thNight
7%329%43%18%1
534
21st to endNight
6%330%43%16%1
594
September1st to 10thNight
10%431%35%16%2
540
11th to 20thNight
11%435%39%11%1
540
21st to endNight
15%7%34%32%11%1
540
October1st to 10thNight
15%8%36%31%10%
559
11th to 20thNight
16%11%30%33%9%1
871
21st to endNight
15%11%38%27%8%1
990
November1st to 10thNight
16%12%35%29%8%1
925
11th to 20thNight
13%12%38%26%10%1
950
21st to endNight
14%14%39%26%7%1
950
December1st to 10thNight
12%9%42%29%7%1
950
11th to 20thNight
14%13%37%27%8%1
950
21st to endNight
19%7%35%30%9%1
1045
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