Fergus Falls
Clear Sky Chart
History

This sumarizes the distribution of each different forecast outcome for the Fergus Falls clear sky chart from 2005-11-05 to 2017-12-02.

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
37%
16505
15%
47724
9%
16459
42%
16459
23%
32695

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
27%
900
9%
2673
6%
895
31%
895
15%
2036
January16th to endNight
26%
960
11%
2597
5%
960
31%
960
15%
2031
February1st to 15thNight
35%
879
12%
2288
5%
875
39%
875
19%
1705
February16th to endNight
35%
747
13%
2009
7%
747
40%
747
19%
1500
March1st to 15thNight
34%
588
13%
2028
9%
588
40%
588
18%
1403
March16th to endNight
33%
576
14%
2112
13%
576
38%
576
16%
1453
April1st to 15thNight
35%
539
16%
1777
12%
539
43%
539
23%
1152
April16th to endNight
32%
540
16%
1620
12%
540
39%
540
20%
1149
May1st to 15thNight
35%
540
13%
1563
7%
540
38%
540
22%
1088
May16th to endNight
40%
562
12%
1452
4%
561
43%
561
31%
966
June1st to 15thNight
46%
540
13%
1260
5%
540
49%
540
37%
830
June16th to endNight
55%
540
15%
1260
7%
540
57%
540
45%
771
July1st to 15thNight
63%
510
16%
1190
8%
510
64%
510
49%
719
July16th to endNight
65%
564
19%
1395
9%
531
66%
531
50%
775
August1st to 15thNight
66%
539
20%
1610
16%
536
69%
536
39%
907
August16th to endNight
55%
573
24%
1719
22%
573
62%
573
40%
954
September1st to 15thNight
57%
540
21%
1847
20%
540
65%
540
37%
975
September16th to endNight
42%
537
24%
1980
19%
537
54%
537
31%
1089
October1st to 15thNight
34%
699
20%
2139
13%
699
40%
699
25%
1356
October16th to endNight
32%
837
17%
2373
8%
837
38%
837
23%
1625
November1st to 15thNight
33%
950
17%
2606
8%
950
40%
950
23%
1805
November16th to endNight
29%
975
14%
2730
8%
975
33%
975
20%
1964
December1st to 15thNight
26%
910
7%
2616
4%
910
29%
910
13%
2079
December16th to endNight
19%
960
9%
2880
4%
960
25%
960
10%
2363

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
12%8%36%5%35%45%7%36%
48733
Night
11%8%46%5%3445%6%38%
47885
Cloud CoverDay
12%7%36%5%35%45%7%36%
48743
Night
10%8%36%5%3445%6%38%
47888
Cloud CoverDay
12%8%36%6%35%45%7%36%
48744
Night
11%8%36%5%3445%7%38%
47889
Cloud CoverDay
13%8%36%5%35%45%7%36%
48742
Night
11%8%36%5%3445%6%38%
47889
TransparencyDay
46%6%14%22%8%
48412
Night
44%6%14%22%10%1
47725
SeeingDay
15%7%29%28%16%2
6399
Night
14%7%32%32%10%1
16507

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
7%10%6%12%7%47%7%6%6%24%
1264
16th to endDay
8%13%7%11%8%5%6%6%6%5%19%
1626
February1st to 15thDay
7%12%6%9%8%46%6%6%6%26%
1575
16th to endDay
9%11%6%8%8%6%8%5%7%8%19%
1476
March1st to 15thDay
14%9%48%8%26%5%5%6%29%
1921
16th to endDay
13%11%5%8%8%46%447%26%
2112
April1st to 15thDay
13%7%35%5%25%46%8%37%
2168
16th to endDay
21%11%26%5%24345%30%
2340
May1st to 15thDay
20%9%36%434446%31%
2386
16th to endDay
15%6%345%345%5%8%36%
2659
June1st to 15thDay
18%6%25%5%345%5%8%35%
2700
16th to endDay
9%3245%25%5%6%10%43%
2700
July1st to 15thDay
7%31432445%9%52%
2700
16th to endDay
5%214435%5%7%9%50%
2674
August1st to 15thDay
9%5%25%435%45%9%44%
2340
16th to endDay
11%42342345%7%51%
2483
September1st to 15thDay
11%42342445%6%49%
2109
16th to endDay
14%42442345%7%47%
1980
October1st to 15thDay
14%9%35%5%24445%41%
1809
16th to endDay
20%11%34424345%35%
1848
November1st to 15thDay
13%10%48%425%346%36%
1581
16th to endDay
13%11%48%9%34445%29%
1560
December1st to 15thDay
11%13%6%8%8%46%5%5%5%22%
1378
16th to endDay
13%15%7%10%10%25%336%19%
1344
January1st to 15thNight
7%11%5%10%9%46%6%6%6%25%
2673
16th to endNight
8%11%6%10%7%46%6%7%6%23%
2597
February1st to 15thNight
8%11%6%7%5%46%5%5%8%30%
2285
16th to endNight
7%9%48%7%46%7%6%6%30%
2009
March1st to 15thNight
13%8%38%5%35%5%5%7%33%
2016
16th to endNight
14%9%48%5%3345%7%33%
2112
April1st to 15thNight
16%8%3442345%6%40%
1777
16th to endNight
20%8%36%5%23435%36%
1620
May1st to 15thNight
16%8%25%5%34446%38%
1563
16th to endNight
10%425%5%35%5%6%7%42%
1451
June1st to 15thNight
12%5%2332345%8%47%
1260
16th to endNight
6%31331346%11%54%
1260
July1st to 15thNight
421332436%8%57%
1260
16th to endNight
321333346%7%60%
1492
August1st to 15thNight
7%31332436%9%53%
1620
16th to endNight
6%31332335%6%59%
1719
September1st to 15thNight
9%413313347%58%
1847
16th to endNight
11%423323345%54%
1980
October1st to 15thNight
13%5%26%42445%5%44%
2139
16th to endNight
17%9%35%423346%38%
2373
November1st to 15thNight
10%8%46%5%35%5%46%39%
2606
16th to endNight
10%10%47%5%3445%7%35%
2730
December1st to 15thNight
10%13%6%9%9%46%5%46%23%
2616
16th to endNight
13%16%8%11%9%3445%5%18%
2880

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
7%11%5%12%7%5%6%7%6%6%24%
1265
16th to endDay
8%13%7%11%8%5%6%6%5%5%20%
1626
February1st to 15thDay
7%11%6%8%8%46%6%7%6%25%
1575
16th to endDay
9%11%5%8%8%6%8%5%7%7%20%
1476
March1st to 15thDay
14%8%48%7%35%5%46%30%
1932
16th to endDay
12%11%5%8%7%46%447%25%
2110
April1st to 15thDay
13%8%35%435%46%8%37%
2168
16th to endDay
21%11%36%5%3435%5%30%
2340
May1st to 15thDay
19%9%46%434446%31%
2386
16th to endDay
15%6%345%35%5%5%8%36%
2659
June1st to 15thDay
18%5%36%425%45%8%34%
2700
16th to endDay
8%4245%245%7%10%43%
2700
July1st to 15thDay
6%32432445%9%52%
2700
16th to endDay
5%314435%5%6%10%49%
2674
August1st to 15thDay
8%5%25%5%35%5%5%9%43%
2340
16th to endDay
11%32442445%6%51%
2483
September1st to 15thDay
11%314433447%50%
2109
16th to endDay
14%424323447%48%
1980
October1st to 15thDay
14%8%35%5%24435%41%
1809
16th to endDay
20%11%34333345%35%
1848
November1st to 15thDay
13%9%48%5%24345%36%
1581
16th to endDay
14%10%5%8%8%34446%29%
1560
December1st to 15thDay
12%12%6%9%8%37%45%5%23%
1378
16th to endDay
13%15%7%10%10%35%44420%
1344
January1st to 15thNight
7%10%6%10%9%46%6%6%6%25%
2673
16th to endNight
8%11%5%10%7%46%7%7%6%23%
2597
February1st to 15thNight
7%11%5%8%6%36%5%5%8%30%
2278
16th to endNight
7%9%39%8%47%7%5%7%29%
2009
March1st to 15thNight
12%8%48%6%35%5%5%7%33%
2028
16th to endNight
14%9%48%5%3445%7%33%
2110
April1st to 15thNight
16%8%3432345%6%41%
1777
16th to endNight
20%8%36%5%23435%36%
1620
May1st to 15thNight
16%8%35%5%35%35%6%38%
1562
16th to endNight
10%425%436%6%6%7%43%
1452
June1st to 15thNight
11%5%1332445%9%47%
1260
16th to endNight
5%31241346%11%54%
1260
July1st to 15thNight
431322447%8%57%
1260
16th to endNight
322332346%8%60%
1492
August1st to 15thNight
6%31342435%9%53%
1620
16th to endNight
6%31332335%6%59%
1719
September1st to 15thNight
9%313313347%57%
1847
16th to endNight
11%423323345%54%
1980
October1st to 15thNight
13%6%26%4235%5%5%44%
2139
16th to endNight
17%9%35%41335%6%39%
2373
November1st to 15thNight
10%9%36%5%345%46%39%
2606
16th to endNight
10%10%37%5%3445%7%36%
2730
December1st to 15thNight
10%13%6%9%9%46%446%24%
2616
16th to endNight
13%16%8%11%9%345%5%5%19%
2880

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
7%10%6%11%7%47%6%7%6%24%
1264
16th to endDay
8%13%6%11%9%5%6%6%6%6%19%
1626
February1st to 15thDay
7%12%5%9%7%46%6%7%6%25%
1575
16th to endDay
9%11%5%8%9%6%8%5%7%8%19%
1476
March1st to 15thDay
14%8%48%7%35%5%5%6%29%
1932
16th to endDay
13%12%5%8%7%46%447%26%
2112
April1st to 15thDay
13%8%35%5%25%46%8%36%
2168
16th to endDay
21%11%26%5%2445%5%30%
2340
May1st to 15thDay
20%9%36%5%34437%31%
2386
16th to endDay
15%6%35%5%345%5%8%36%
2659
June1st to 15thDay
18%6%25%5%345%5%8%34%
2700
16th to endDay
9%324435%5%7%10%43%
2700
July1st to 15thDay
7%31442445%9%52%
2700
16th to endDay
5%214425%5%7%10%49%
2674
August1st to 15thDay
9%5%25%5%36%45%9%44%
2340
16th to endDay
11%41442345%7%51%
2483
September1st to 15thDay
11%4145%24447%49%
2109
16th to endDay
14%42432345%7%47%
1980
October1st to 15thDay
14%9%35%424445%40%
1809
16th to endDay
20%11%34423445%35%
1848
November1st to 15thDay
13%10%5%8%425%345%36%
1581
16th to endDay
14%11%48%9%24445%29%
1560
December1st to 15thDay
11%13%6%9%8%47%46%5%22%
1378
16th to endDay
13%15%7%10%11%35%436%19%
1344
January1st to 15thNight
7%11%5%10%9%36%6%6%6%24%
2673
16th to endNight
8%11%6%9%8%46%6%7%6%23%
2597
February1st to 15thNight
7%11%6%8%5%37%5%5%7%30%
2278
16th to endNight
7%9%48%8%46%7%6%6%29%
2009
March1st to 15thNight
12%8%38%5%35%5%5%7%33%
2028
16th to endNight
13%9%48%5%3445%7%33%
2112
April1st to 15thNight
16%7%34414447%40%
1777
16th to endNight
20%9%36%5%23435%35%
1620
May1st to 15thNight
16%8%35%6%33446%37%
1562
16th to endNight
10%4245%446%6%8%42%
1451
June1st to 15thNight
12%5%2332345%9%47%
1260
16th to endNight
6%31331346%10%54%
1260
July1st to 15thNight
421322446%8%58%
1260
16th to endNight
322333346%7%60%
1492
August1st to 15thNight
7%31332345%9%54%
1620
16th to endNight
6%31332335%6%59%
1719
September1st to 15thNight
9%413312447%57%
1847
16th to endNight
12%423423345%54%
1980
October1st to 15thNight
13%5%26%42446%5%43%
2139
16th to endNight
17%8%35%424347%38%
2373
November1st to 15thNight
10%9%36%5%35%5%46%38%
2606
16th to endNight
10%10%47%6%3445%7%35%
2730
December1st to 15thNight
10%13%6%9%9%46%5%46%23%
2616
16th to endNight
13%16%8%11%8%34445%18%
2880

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
7%10%6%11%7%5%6%6%7%6%23%
1264
16th to endDay
9%13%7%11%8%5%7%6%7%5%17%
1626
February1st to 15thDay
7%12%5%9%8%46%6%7%6%25%
1575
16th to endDay
9%12%48%9%6%8%6%6%8%19%
1476
March1st to 15thDay
14%9%5%7%8%3445%6%29%
1932
16th to endDay
13%12%5%8%7%35%446%26%
2110
April1st to 15thDay
12%9%26%5%3445%8%36%
2168
16th to endDay
21%10%46%5%34445%30%
2340
May1st to 15thDay
21%9%36%5%34346%32%
2386
16th to endDay
15%6%25%435%45%8%37%
2659
June1st to 15thDay
18%6%25%435%45%8%35%
2700
16th to endDay
10%424435%5%6%10%43%
2700
July1st to 15thDay
7%31442346%8%52%
2700
16th to endDay
5%213425%5%7%9%49%
2674
August1st to 15thDay
9%425%435%5%6%9%44%
2340
16th to endDay
12%41432445%6%51%
2483
September1st to 15thDay
12%41442445%5%49%
2109
16th to endDay
14%41442345%7%46%
1980
October1st to 15thDay
15%9%35%42445%440%
1809
16th to endDay
20%11%34424346%34%
1848
November1st to 15thDay
13%10%5%8%424445%35%
1581
16th to endDay
15%10%5%8%8%34446%28%
1560
December1st to 15thDay
11%13%5%10%8%47%45%5%22%
1378
16th to endDay
12%16%7%11%9%45%335%19%
1344
January1st to 15thNight
8%10%5%10%8%46%6%7%6%24%
2673
16th to endNight
9%11%6%9%7%46%6%7%6%23%
2597
February1st to 15thNight
7%11%6%8%5%36%5%6%7%29%
2278
16th to endNight
7%9%48%8%46%6%6%6%29%
2009
March1st to 15thNight
12%8%48%6%35%45%7%32%
2028
16th to endNight
14%8%48%6%3435%6%34%
2112
April1st to 15thNight
16%8%25%324447%40%
1777
16th to endNight
20%9%36%5%2343435%
1620
May1st to 15thNight
17%8%35%433445%37%
1562
16th to endNight
10%4245%35%47%9%42%
1451
June1st to 15thNight
13%32342345%8%47%
1260
16th to endNight
6%31332347%10%53%
1260
July1st to 15thNight
421332446%8%58%
1260
16th to endNight
421332345%7%61%
1492
August1st to 15thNight
7%31332445%8%55%
1620
16th to endNight
7%313413346%58%
1719
September1st to 15thNight
10%313313347%57%
1847
16th to endNight
12%424323246%53%
1980
October1st to 15thNight
12%6%26%5%2345%5%43%
2139
16th to endNight
17%9%35%423346%38%
2373
November1st to 15thNight
10%9%46%5%25%45%6%37%
2606
16th to endNight
11%10%47%6%3345%7%34%
2730
December1st to 15thNight
11%12%6%9%8%46%5%6%5%23%
2616
16th to endNight
13%16%7%12%9%3444418%
2880

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%7%12%17%5%
1265
16th to endDay
63%6%14%14%1
1626
February1st to 15thDay
56%5%16%16%4
1576
16th to endDay
60%7%12%16%3
1476
March1st to 15thDay
54%6%14%19%6%
1932
16th to endDay
58%6%14%17%3
2112
April1st to 15thDay
44%7%14%21%11%1
2168
16th to endDay
55%6%10%16%9%1
2340
May1st to 15thDay
53%5%11%21%6%
2386
16th to endDay
44%7%15%22%8%
2663
June1st to 15thDay
46%8%14%22%7%
2700
16th to endDay
33%9%19%25%11%
2700
July1st to 15thDay
28%7%15%32%14%1
2541
16th to endDay
28%9%20%28%12%1
2509
August1st to 15thDay
34%8%16%28%9%2
2326
16th to endDay
32%6%15%29%13%2
2483
September1st to 15thDay
33%6%17%32%10%
2109
16th to endDay
36%5%16%32%8%
1980
October1st to 15thDay
44%6%14%23%11%
1809
16th to endDay
51%5%13%20%8%
1848
November1st to 15thDay
50%5%13%20%10%
1581
16th to endDay
56%6%15%12%7%
1560
December1st to 15thDay
62%7%13%13%3
1378
16th to endDay
67%410%11%4
1344
January1st to 15thNight
57%6%12%16%7%
2673
16th to endNight
57%7%13%16%5%
2597
February1st to 15thNight
50%7%13%20%7%
2288
16th to endNight
51%8%12%17%9%
2009
March1st to 15thNight
49%5%15%20%7%
2028
16th to endNight
50%6%15%22%4
2112
April1st to 15thNight
43%6%12%26%10%1
1777
16th to endNight
51%49%21%10%2
1620
May1st to 15thNight
46%6%11%21%12%1
1563
16th to endNight
36%9%15%24%12%1
1453
June1st to 15thNight
34%5%16%29%11%1
1260
16th to endNight
23%9%18%29%15%3
1260
July1st to 15thNight
22%7%15%35%16%2
1190
16th to endNight
20%6%18%32%17%4
1395
August1st to 15thNight
26%7%16%31%14%3
1610
16th to endNight
25%7%13%31%19%2
1719
September1st to 15thNight
26%5%16%34%14%
1847
16th to endNight
32%5%13%33%14%
1980
October1st to 15thNight
40%5%12%26%13%2
2139
16th to endNight
47%415%22%10%
2373
November1st to 15thNight
45%6%13%23%9%1
2606
16th to endNight
48%8%20%15%7%
2730
December1st to 15thNight
60%7%12%13%5%
2616
16th to endNight
67%5%11%11%3
2880

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
16%8%32%27%14%
90
16th to endDay
15%7%32%30%14%
96
February1st to 15thDay
17%10%42%28%1
90
16th to endDay
16%7%44%19%12%
81
March1st to 15thDay
26%10%24%34%4
90
16th to endDay
17%5%34%20%16%5%
96
April1st to 15thDay
16%14%32%21%13%
287
16th to endDay
26%9%28%21%11%2
450
May1st to 15thDay
21%11%30%22%12%1
468
16th to endDay
19%6%31%26%13%2
517
June1st to 15thDay
17%7%27%29%16%
495
16th to endDay
9%5%33%31%16%3
495
July1st to 15thDay
8%425%31%25%4
475
16th to endDay
5%423%37%24%4
515
August1st to 15thDay
9%223%34%26%3
493
16th to endDay
12%326%29%22%5%
523
September1st to 15thDay
9%326%39%18%3
264
16th to endDay
17%6%40%21%12%1
135
October1st to 15thDay
14%11%36%27%8%1
135
16th to endDay
22%15%27%24%9%1
144
November1st to 15thDay
19%9%24%32%13%
135
16th to endDay
31%9%37%20%2
135
December1st to 15thDay
18%6%40%26%8%
94
16th to endDay
25%11%35%19%7%1
96
January1st to 15thNight
11%10%38%27%9%2
900
16th to endNight
15%10%38%30%5%
960
February1st to 15thNight
11%9%33%31%10%2
880
16th to endNight
12%7%35%30%10%3
747
March1st to 15thNight
15%7%35%30%9%1
588
16th to endNight
17%9%32%28%9%1
576
April1st to 15thNight
20%7%32%30%8%
539
16th to endNight
25%8%28%28%8%1
540
May1st to 15thNight
20%8%32%29%8%
540
16th to endNight
11%5%36%32%12%
563
June1st to 15thNight
15%429%40%9%
540
16th to endNight
9%428%42%14%
540
July1st to 15thNight
5%323%45%20%1
510
16th to endNight
4223%46%21%1
564
August1st to 15thNight
8%118%49%19%2
539
16th to endNight
7%330%35%21%1
573
September1st to 15thNight
11%323%41%16%2
540
16th to endNight
14%435%30%13%1
537
October1st to 15thNight
17%9%33%29%9%
699
16th to endNight
22%8%31%28%8%
837
November1st to 15thNight
15%10%33%30%9%
950
16th to endNight
16%13%35%27%7%
975
December1st to 15thNight
17%10%35%29%7%
910
16th to endNight
20%8%33%29%6%1
960
Page generated at 2017-12-03 10:16:42. Version ac04

Copyright 2017 A. Danko


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