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 2017-04-28.

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%
15758
15%
45608
9%
15712
42%
15712
23%
31445

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
32%
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
36%
747
13%
2009
7%
747
40%
747
19%
1500
March1st to 15thNight
33%
588
13%
2028
9%
588
39%
588
18%
1403
March16th to endNight
32%
576
14%
2112
13%
576
38%
576
16%
1453
April1st to 15thNight
34%
539
16%
1777
12%
539
42%
539
23%
1152
April16th to endNight
32%
534
16%
1602
12%
534
40%
534
20%
1136
May1st to 15thNight
31%
495
14%
1433
7%
495
35%
495
20%
1012
May16th to endNight
42%
514
12%
1328
4%
513
44%
513
31%
882
June1st to 15thNight
43%
495
14%
1155
5%
495
47%
495
35%
778
June16th to endNight
55%
495
13%
1155
6%
495
57%
495
45%
706
July1st to 15thNight
62%
465
17%
1085
8%
465
63%
465
48%
659
July16th to endNight
64%
522
17%
1283
8%
489
65%
489
49%
722
August1st to 15thNight
64%
494
22%
1475
17%
491
68%
491
40%
823
August16th to endNight
54%
525
22%
1575
20%
525
61%
525
39%
877
September1st to 15thNight
57%
495
22%
1693
21%
495
65%
495
36%
911
September16th to endNight
43%
492
23%
1815
19%
492
54%
492
32%
983
October1st to 15thNight
33%
641
20%
1961
13%
641
40%
641
24%
1254
October16th to endNight
31%
767
15%
2175
7%
767
37%
767
22%
1506
November1st to 15thNight
34%
875
18%
2400
8%
875
41%
875
24%
1650
November16th to endNight
29%
900
13%
2520
9%
900
32%
900
19%
1839
December1st to 15thNight
25%
900
7%
2589
4%
900
28%
900
13%
2064
December16th to endNight
20%
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
13%8%36%5%35%45%7%36%
46096
Night
11%8%46%5%3445%6%38%
45769
Cloud CoverDay
12%8%36%5%35%5%5%7%36%
46106
Night
11%8%46%5%3445%6%38%
45772
Cloud CoverDay
13%8%36%6%35%45%7%35%
46107
Night
11%8%46%5%3445%6%37%
45773
Cloud CoverDay
13%8%36%5%35%45%7%35%
46105
Night
11%8%46%5%3445%6%37%
45773
TransparencyDay
46%7%15%21%8%
45775
Night
45%6%14%22%9%1
45609
SeeingDay
15%7%29%28%16%2
5493
Night
15%7%32%32%10%1
15760

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
22%11%26%5%24345%30%
2305
May1st to 15thDay
21%9%37%424446%29%
2186
16th to endDay
14%6%345%345%5%9%38%
2431
June1st to 15thDay
20%6%26%5%35%5%5%8%31%
2475
16th to endDay
9%3234245%7%10%44%
2475
July1st to 15thDay
7%31432446%9%51%
2475
16th to endDay
5%214435%5%7%10%49%
2478
August1st to 15thDay
8%5%24425%45%8%44%
2145
16th to endDay
11%42342345%7%50%
2275
September1st to 15thDay
12%42442445%6%48%
1933
16th to endDay
13%42442345%7%48%
1815
October1st to 15thDay
14%10%35%424445%40%
1658
16th to endDay
21%11%3443424434%
1694
November1st to 15thDay
13%9%47%425%346%38%
1457
16th to endDay
14%11%5%8%9%24445%28%
1440
December1st to 15thDay
11%13%6%8%8%46%5%5%5%22%
1368
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%
1602
May1st to 15thNight
17%9%25%5%34345%37%
1433
16th to endNight
9%4245%35%6%6%7%44%
1327
June1st to 15thNight
13%5%2332445%8%45%
1155
16th to endNight
5%31331346%10%54%
1155
July1st to 15thNight
421333446%8%57%
1155
16th to endNight
321333346%7%59%
1380
August1st to 15thNight
6%313315%36%9%54%
1485
16th to endNight
5%32332335%6%58%
1575
September1st to 15thNight
10%413313347%57%
1693
16th to endNight
10%423323346%55%
1815
October1st to 15thNight
13%5%36%4245%5%5%43%
1961
16th to endNight
18%9%35%323346%37%
2175
November1st to 15thNight
10%9%36%5%35%446%40%
2400
16th to endNight
11%11%47%5%3435%7%34%
2520
December1st to 15thNight
10%13%6%9%9%46%5%46%23%
2589
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
22%11%36%5%2335%5%30%
2305
May1st to 15thDay
21%9%46%5%34446%29%
2186
16th to endDay
13%6%345%345%5%9%38%
2431
June1st to 15thDay
19%6%36%5%25%45%8%31%
2475
16th to endDay
8%4234245%7%10%44%
2475
July1st to 15thDay
7%3243245%6%9%51%
2475
16th to endDay
5%314435%5%7%10%49%
2478
August1st to 15thDay
8%5%25%5%345%5%9%44%
2145
16th to endDay
10%32442445%6%51%
2275
September1st to 15thDay
12%3144345%46%48%
1933
16th to endDay
13%424323447%48%
1815
October1st to 15thDay
14%9%35%5%24435%40%
1658
16th to endDay
21%11%34433335%34%
1694
November1st to 15thDay
13%9%47%424346%38%
1457
16th to endDay
14%11%5%8%8%34445%28%
1440
December1st to 15thDay
12%12%6%9%8%37%45%5%23%
1368
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%
1602
May1st to 15thNight
17%8%346%35%35%5%36%
1432
16th to endNight
9%425%436%6%5%7%44%
1328
June1st to 15thNight
12%5%24324449%45%
1155
16th to endNight
5%31241346%11%54%
1155
July1st to 15thNight
431322447%8%57%
1155
16th to endNight
312332345%8%59%
1380
August1st to 15thNight
6%31342445%9%54%
1485
16th to endNight
5%31332435%6%59%
1575
September1st to 15thNight
10%313313347%56%
1693
16th to endNight
10%423323346%55%
1815
October1st to 15thNight
13%6%26%4235%5%5%43%
1961
16th to endNight
17%9%35%41335%6%38%
2175
November1st to 15thNight
10%9%36%5%25%5%5%5%40%
2400
16th to endNight
11%11%47%5%3435%7%34%
2520
December1st to 15thNight
10%13%6%9%9%46%446%23%
2589
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
22%11%26%5%24445%30%
2305
May1st to 15thDay
22%9%46%5%34437%29%
2186
16th to endDay
14%5%345%345%6%9%38%
2431
June1st to 15thDay
19%7%26%5%345%5%8%31%
2475
16th to endDay
9%3234245%7%10%44%
2475
July1st to 15thDay
7%31442446%9%51%
2475
16th to endDay
5%214425%5%7%10%49%
2478
August1st to 15thDay
8%425%5%35%45%9%44%
2145
16th to endDay
10%41442345%7%50%
2275
September1st to 15thDay
12%4245%2445%7%48%
1933
16th to endDay
13%42432335%7%48%
1815
October1st to 15thDay
14%10%35%424445%39%
1658
16th to endDay
21%11%34423335%34%
1694
November1st to 15thDay
13%9%47%425%346%37%
1457
16th to endDay
14%11%5%8%9%24445%28%
1440
December1st to 15thDay
11%13%6%9%8%47%46%5%22%
1368
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%8%36%5%23435%36%
1602
May1st to 15thNight
17%9%35%6%33445%36%
1432
16th to endNight
9%4244446%5%8%43%
1327
June1st to 15thNight
12%5%24423449%45%
1155
16th to endNight
6%31332346%10%54%
1155
July1st to 15thNight
421322446%8%57%
1155
16th to endNight
322333336%7%59%
1380
August1st to 15thNight
6%31332345%9%54%
1485
16th to endNight
5%32332335%6%58%
1575
September1st to 15thNight
10%413313447%56%
1693
16th to endNight
11%413413346%55%
1815
October1st to 15thNight
13%6%26%42446%5%42%
1961
16th to endNight
18%9%35%324347%37%
2175
November1st to 15thNight
10%9%36%5%35%446%39%
2400
16th to endNight
11%11%47%6%3445%7%34%
2520
December1st to 15thNight
10%13%6%9%9%46%5%46%23%
2589
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%
2305
May1st to 15thDay
23%9%36%6%34346%29%
2186
16th to endDay
14%6%25%435%45%8%39%
2431
June1st to 15thDay
19%7%35%5%35%5%5%8%31%
2475
16th to endDay
10%424325%5%6%10%43%
2475
July1st to 15thDay
8%31442346%9%51%
2475
16th to endDay
5%213425%5%7%9%49%
2478
August1st to 15thDay
8%425%43446%9%44%
2145
16th to endDay
11%31442445%6%51%
2275
September1st to 15thDay
12%41442446%5%48%
1933
16th to endDay
14%414423447%47%
1815
October1st to 15thDay
15%9%45%42345%5%39%
1658
16th to endDay
21%11%34423345%33%
1694
November1st to 15thDay
12%9%48%425%445%37%
1457
16th to endDay
15%11%5%8%8%34446%27%
1440
December1st to 15thDay
11%13%5%10%8%47%45%5%22%
1368
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%2343436%
1602
May1st to 15thNight
18%8%35%433445%36%
1432
16th to endNight
10%4245%35%5%6%8%44%
1327
June1st to 15thNight
14%32342345%8%45%
1155
16th to endNight
6%31232347%10%53%
1155
July1st to 15thNight
421332446%8%57%
1155
16th to endNight
421332345%7%60%
1380
August1st to 15thNight
6%31332446%8%56%
1485
16th to endNight
7%313413347%58%
1575
September1st to 15thNight
10%413423347%56%
1693
16th to endNight
11%424423246%55%
1815
October1st to 15thNight
13%7%26%5%2345%6%42%
1961
16th to endNight
18%9%35%424346%37%
2175
November1st to 15thNight
10%9%46%5%25%45%6%38%
2400
16th to endNight
12%11%47%6%3345%7%32%
2520
December1st to 15thNight
11%13%6%9%8%46%5%6%5%23%
2589
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
2305
May1st to 15thDay
55%5%12%19%6%
2186
16th to endDay
42%7%16%23%8%1
2435
June1st to 15thDay
49%9%14%21%5%
2475
16th to endDay
32%9%19%25%11%
2475
July1st to 15thDay
29%7%16%31%14%1
2316
16th to endDay
28%9%20%28%11%1
2313
August1st to 15thDay
33%8%16%27%9%3
2131
16th to endDay
31%6%15%28%14%2
2275
September1st to 15thDay
34%6%18%30%10%
1933
16th to endDay
36%5%16%32%8%
1815
October1st to 15thDay
45%6%14%22%10%
1658
16th to endDay
53%5%12%19%8%
1694
November1st to 15thDay
47%5%14%20%10%
1457
16th to endDay
58%6%14%11%8%
1440
December1st to 15thDay
61%7%13%13%3
1368
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
1602
May1st to 15thNight
48%6%11%20%11%1
1433
16th to endNight
35%9%15%24%12%2
1329
June1st to 15thNight
36%6%17%29%9%
1155
16th to endNight
23%9%19%30%14%3
1155
July1st to 15thNight
23%7%15%35%15%2
1085
16th to endNight
21%6%19%32%16%3
1283
August1st to 15thNight
25%7%16%31%15%4
1475
16th to endNight
25%7%13%29%21%2
1575
September1st to 15thNight
28%5%16%34%14%1
1693
16th to endNight
30%5%14%34%14%
1815
October1st to 15thNight
41%5%12%26%12%2
1961
16th to endNight
48%415%22%9%
2175
November1st to 15thNight
44%6%12%24%10%1
2400
16th to endNight
49%8%19%13%8%
2520
December1st to 15thNight
61%7%12%13%5%
2589
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
27%9%26%21%11%2
437
May1st to 15thDay
23%13%30%19%10%1
393
16th to endDay
16%7%31%26%15%3
437
June1st to 15thDay
20%7%28%29%13%
420
16th to endDay
9%5%34%29%17%4
420
July1st to 15thDay
8%426%30%25%4
400
16th to endDay
5%5%25%37%22%4
445
August1st to 15thDay
8%226%36%23%3
418
16th to endDay
11%327%29%22%5%
443
September1st to 15thDay
10%224%42%17%3
208
16th to endDay
15%8%34%24%14%2
90
October1st to 15thDay
14%10%34%32%7%1
90
16th to endDay
27%10%28%20%11%2
96
November1st to 15thDay
12%7%24%36%17%1
90
16th to endDay
40%6%31%20%2
90
December1st to 15thDay
17%6%41%25%8%
90
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
534
May1st to 15thNight
22%9%33%26%8%
495
16th to endNight
11%5%36%32%13%
515
June1st to 15thNight
16%5%30%39%8%
495
16th to endNight
9%428%42%14%
495
July1st to 15thNight
5%325%43%20%1
465
16th to endNight
4224%46%20%1
522
August1st to 15thNight
7%119%50%18%2
494
16th to endNight
7%332%35%20%1
525
September1st to 15thNight
12%422%41%16%2
495
16th to endNight
13%435%30%14%2
492
October1st to 15thNight
18%9%33%29%9%
641
16th to endNight
23%8%30%29%8%
767
November1st to 15thNight
15%10%33%30%9%
875
16th to endNight
17%13%35%26%7%
900
December1st to 15thNight
17%10%35%29%7%
900
16th to endNight
20%8%33%29%6%1
960
Page generated at 2017-04-29 08:45:08. Version ac04

Copyright 2017 A. Danko


Fergus Falls Clear Sky Chart | Charts Home