Fargo
Clear Sky Chart
History

This sumarizes the distribution of each different forecast outcome for the Fargo clear sky chart from 2005-11-05 to 2018-08-29.

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
34%
17500
15%
50509
8%
17453
40%
17453
21%
34689

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%
975
10%
2889
6%
970
32%
970
14%
2207
January16th to endNight
25%
1040
11%
2870
4%
1040
30%
1040
14%
2216
February1st to 15thNight
32%
955
11%
2483
4%
951
36%
951
17%
1864
February16th to endNight
32%
789
13%
2155
7%
789
37%
789
17%
1628
March1st to 15thNight
29%
660
13%
2220
8%
660
36%
660
16%
1565
March16th to endNight
30%
624
14%
2288
11%
624
36%
624
16%
1562
April1st to 15thNight
29%
584
16%
1908
10%
584
40%
584
21%
1224
April16th to endNight
26%
579
16%
1736
8%
579
37%
579
17%
1224
May1st to 15thNight
30%
585
13%
1706
5%
585
35%
585
19%
1188
May16th to endNight
37%
611
13%
1515
4%
609
41%
609
28%
988
June1st to 15thNight
40%
585
14%
1365
6%
585
44%
585
31%
895
June16th to endNight
47%
585
13%
1365
5%
585
51%
585
34%
866
July1st to 15thNight
55%
555
17%
1295
8%
555
58%
555
45%
786
July16th to endNight
54%
612
19%
1483
8%
579
60%
579
44%
837
August1st to 15thNight
61%
575
22%
1717
15%
572
65%
572
38%
939
August16th to endNight
52%
615
22%
1845
20%
615
59%
615
36%
1045
September1st to 15thNight
51%
540
22%
1846
20%
540
60%
540
34%
972
September16th to endNight
45%
537
25%
1980
19%
537
57%
537
30%
1081
October1st to 15thNight
33%
684
20%
2124
12%
684
41%
684
23%
1340
October16th to endNight
28%
870
17%
2406
8%
870
35%
870
22%
1671
November1st to 15thNight
30%
950
17%
2593
7%
950
37%
950
21%
1832
November16th to endNight
26%
975
14%
2730
7%
975
32%
975
18%
1976
December1st to 15thNight
24%
975
7%
2870
4%
975
26%
975
11%
2255
December16th to endNight
17%
1040
9%
3120
4%
1040
24%
1040
9%
2528

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%36%5%3445%7%37%
51760
Night
11%8%36%5%3445%6%38%
50667
Cloud CoverDay
13%7%36%5%3445%7%37%
51770
Night
11%8%36%5%3445%6%39%
50670
Cloud CoverDay
13%7%36%6%3445%7%37%
51771
Night
11%8%36%5%35%45%6%38%
50671
Cloud CoverDay
12%8%36%5%3445%7%37%
51769
Night
11%8%36%5%35%45%6%38%
50671
TransparencyDay
45%7%14%22%8%
51435
Night
45%6%13%22%10%1
50510
SeeingDay
14%13%27%27%14%3
7483
Night
13%19%26%29%10%1
17500

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%11%6%9%9%36%48%6%25%
1378
16th to endDay
8%14%6%10%10%5%6%5%5%6%19%
1706
February1st to 15thDay
8%11%5%7%7%5%6%5%6%6%29%
1710
16th to endDay
10%12%5%9%9%6%5%6%7%8%18%
1614
March1st to 15thDay
15%9%5%7%7%35%45%6%28%
2059
16th to endDay
14%11%49%7%25%45%7%27%
2288
April1st to 15thDay
13%9%27%5%34447%36%
2367
16th to endDay
20%9%35%43335%6%33%
2499
May1st to 15thDay
20%8%25%6%24446%34%
2575
16th to endDay
15%6%25%5%345%5%7%38%
2948
June1st to 15thDay
17%425%5%25%45%8%37%
2925
16th to endDay
10%4145%345%7%9%42%
2925
July1st to 15thDay
7%3144245%5%8%51%
2925
16th to endDay
5%3134245%7%9%51%
2942
August1st to 15thDay
8%324435%5%6%9%44%
2486
16th to endDay
11%413423445%53%
2653
September1st to 15thDay
11%324424447%50%
2112
16th to endDay
15%424413347%47%
1980
October1st to 15thDay
16%6%25%5%23346%43%
1824
16th to endDay
21%9%35%433345%34%
1817
November1st to 15thDay
12%9%5%8%5%24435%38%
1594
16th to endDay
11%13%5%8%7%3344431%
1560
December1st to 15thDay
12%14%6%9%7%46%5%5%421%
1417
16th to endDay
12%16%5%10%7%45%445%21%
1456
January1st to 15thNight
8%10%5%9%8%47%7%6%5%25%
2889
16th to endNight
10%10%49%7%47%6%6%6%25%
2870
February1st to 15thNight
8%10%49%6%46%5%5%6%31%
2480
16th to endNight
9%9%49%7%46%6%6%6%29%
2155
March1st to 15thNight
13%9%5%8%6%34447%32%
2208
16th to endNight
14%9%47%5%2445%6%35%
2288
April1st to 15thNight
14%7%35%42445%6%41%
1908
16th to endNight
20%8%35%423345%36%
1736
May1st to 15thNight
17%7%26%5%24346%38%
1706
16th to endNight
10%325%3246%6%8%45%
1514
June1st to 15thNight
11%31442445%10%46%
1365
16th to endNight
7%223425%45%9%50%
1365
July1st to 15thNight
421332445%8%60%
1365
16th to endNight
421332335%8%59%
1577
August1st to 15thNight
6%31332345%7%56%
1727
16th to endNight
8%313224446%56%
1845
September1st to 15thNight
9%313213447%58%
1846
16th to endNight
12%413313346%54%
1980
October1st to 15thNight
14%5%25%43445%6%44%
2124
16th to endNight
18%9%2442435%6%38%
2406
November1st to 15thNight
11%10%5%7%5%2445%6%37%
2593
16th to endNight
12%8%36%6%35%45%7%34%
2730
December1st to 15thNight
10%14%7%9%9%45%445%25%
2870
16th to endNight
12%17%6%10%8%3434422%
3120

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%6%9%9%45%48%6%25%
1379
16th to endDay
9%12%6%10%10%5%6%45%6%20%
1706
February1st to 15thDay
9%11%5%8%8%5%6%5%5%6%28%
1710
16th to endDay
10%12%5%9%9%6%6%5%7%7%18%
1614
March1st to 15thDay
15%9%5%7%6%35%447%28%
2070
16th to endDay
14%11%5%8%6%35%5%48%26%
2286
April1st to 15thDay
13%8%36%5%3445%7%36%
2367
16th to endDay
20%9%35%43435%6%33%
2499
May1st to 15thDay
20%8%35%5%34346%34%
2575
16th to endDay
15%5%245%345%5%7%38%
2948
June1st to 15thDay
18%335%5%25%45%8%37%
2925
16th to endDay
11%4245%245%7%9%43%
2925
July1st to 15thDay
8%3144245%5%8%52%
2925
16th to endDay
5%312425%5%7%10%51%
2942
August1st to 15thDay
9%324435%5%6%9%45%
2486
16th to endDay
11%413423346%53%
2653
September1st to 15thDay
11%3144235%47%50%
2112
16th to endDay
15%424413447%47%
1980
October1st to 15thDay
16%6%26%5%23345%43%
1824
16th to endDay
21%9%35%5%22345%34%
1817
November1st to 15thDay
13%8%5%8%5%34335%38%
1594
16th to endDay
12%12%5%8%7%3344431%
1560
December1st to 15thDay
12%14%6%9%7%46%6%5%422%
1417
16th to endDay
12%16%6%9%7%35%45%5%21%
1456
January1st to 15thNight
8%10%6%9%8%47%7%6%5%26%
2889
16th to endNight
10%10%49%6%5%6%6%6%6%25%
2870
February1st to 15thNight
8%10%48%6%46%5%5%5%32%
2473
16th to endNight
8%10%49%8%46%5%5%6%29%
2155
March1st to 15thNight
13%9%5%8%6%34447%33%
2220
16th to endNight
14%9%47%5%3435%6%35%
2286
April1st to 15thNight
14%7%35%42445%7%41%
1908
16th to endNight
20%8%35%424335%37%
1736
May1st to 15thNight
17%7%25%5%24446%38%
1705
16th to endNight
10%4144246%7%8%45%
1515
June1st to 15thNight
11%41442335%10%46%
1365
16th to endNight
7%224335%5%5%9%51%
1365
July1st to 15thNight
4213224448%61%
1365
16th to endNight
421331345%8%59%
1577
August1st to 15thNight
6%31432345%8%56%
1727
16th to endNight
8%413324446%56%
1845
September1st to 15thNight
9%312213447%58%
1846
16th to endNight
13%313323346%54%
1980
October1st to 15thNight
14%5%25%43435%6%45%
2124
16th to endNight
18%9%34423446%39%
2406
November1st to 15thNight
11%9%47%5%2445%6%37%
2593
16th to endNight
12%8%36%6%345%5%7%34%
2730
December1st to 15thNight
10%14%7%9%9%35%445%25%
2870
16th to endNight
13%17%6%9%9%3433422%
3120

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%11%6%9%10%36%48%5%25%
1378
16th to endDay
9%13%6%11%9%5%6%5%5%6%20%
1706
February1st to 15thDay
8%12%5%7%7%47%5%6%6%28%
1710
16th to endDay
10%12%5%10%9%5%6%6%6%7%19%
1614
March1st to 15thDay
15%9%5%7%6%35%5%46%28%
2070
16th to endDay
14%11%5%8%7%25%45%7%27%
2288
April1st to 15thDay
13%8%36%6%35%347%36%
2367
16th to endDay
20%9%35%43335%6%33%
2499
May1st to 15thDay
19%8%35%6%24446%34%
2575
16th to endDay
16%5%25%5%3445%7%38%
2948
June1st to 15thDay
18%435%425%45%8%37%
2925
16th to endDay
10%4145%245%7%9%42%
2925
July1st to 15thDay
8%3144245%5%8%51%
2925
16th to endDay
5%3144345%7%10%50%
2942
August1st to 15thDay
8%415%425%6%6%8%45%
2486
16th to endDay
11%414423436%52%
2653
September1st to 15thDay
11%3245%23447%50%
2112
16th to endDay
14%42442335%7%47%
1980
October1st to 15thDay
16%6%25%5%23335%43%
1824
16th to endDay
21%10%35%5%23345%34%
1817
November1st to 15thDay
13%9%5%8%5%34335%37%
1594
16th to endDay
12%13%5%8%8%2444431%
1560
December1st to 15thDay
12%14%6%10%7%46%6%4421%
1417
16th to endDay
12%16%5%10%7%5%5%445%21%
1456
January1st to 15thNight
8%10%5%9%8%37%7%5%5%26%
2889
16th to endNight
10%11%49%7%5%7%6%6%6%24%
2870
February1st to 15thNight
8%10%5%8%6%46%5%5%6%31%
2473
16th to endNight
8%10%49%7%47%6%5%6%29%
2155
March1st to 15thNight
13%9%5%8%5%34447%33%
2220
16th to endNight
13%10%38%5%34446%35%
2288
April1st to 15thNight
13%7%35%43445%7%40%
1908
16th to endNight
20%8%35%5%24345%37%
1736
May1st to 15thNight
17%7%35%6%25%445%38%
1705
16th to endNight
10%425%3246%6%8%45%
1514
June1st to 15thNight
11%32443436%10%46%
1365
16th to endNight
6%223435%5%5%10%50%
1365
July1st to 15thNight
4213324448%60%
1365
16th to endNight
431331345%8%59%
1577
August1st to 15thNight
6%31432345%8%56%
1727
16th to endNight
8%41332445%5%56%
1845
September1st to 15thNight
9%313214347%58%
1846
16th to endNight
13%413323346%54%
1980
October1st to 15thNight
13%5%25%434446%44%
2124
16th to endNight
17%9%3442335%5%39%
2406
November1st to 15thNight
11%10%5%7%425%45%6%36%
2593
16th to endNight
13%8%36%6%45%45%7%33%
2730
December1st to 15thNight
10%14%7%9%9%45%44425%
2870
16th to endNight
13%17%6%10%8%35%34421%
3120

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%11%6%8%10%35%48%6%25%
1378
16th to endDay
8%14%6%11%9%5%6%5%46%19%
1706
February1st to 15thDay
8%12%5%8%7%47%5%5%6%28%
1710
16th to endDay
10%12%5%10%8%5%6%6%6%8%18%
1614
March1st to 15thDay
15%9%47%7%35%5%5%6%28%
2070
16th to endDay
13%12%48%7%34447%27%
2286
April1st to 15thDay
13%8%36%6%35%447%36%
2367
16th to endDay
20%9%36%42435%5%33%
2499
May1st to 15thDay
19%8%35%6%24446%34%
2575
16th to endDay
15%5%246%345%5%7%37%
2948
June1st to 15thDay
17%435%425%36%8%36%
2925
16th to endDay
10%4245%35%5%7%10%41%
2925
July1st to 15thDay
8%3144345%5%9%50%
2925
16th to endDay
5%3144345%7%10%50%
2942
August1st to 15thDay
7%415%426%5%6%9%44%
2486
16th to endDay
11%413423446%52%
2653
September1st to 15thDay
11%4245%24447%49%
2112
16th to endDay
15%424413447%47%
1980
October1st to 15thDay
16%7%35%423336%43%
1824
16th to endDay
21%11%35%5%33345%34%
1817
November1st to 15thDay
13%9%5%9%433435%37%
1594
16th to endDay
12%13%5%9%7%24435%30%
1560
December1st to 15thDay
12%14%6%10%8%45%6%5%421%
1417
16th to endDay
12%16%5%11%7%5%5%445%21%
1456
January1st to 15thNight
8%10%5%9%8%37%7%5%5%26%
2889
16th to endNight
10%11%49%7%47%6%6%6%24%
2870
February1st to 15thNight
8%11%5%8%7%37%5%5%5%31%
2473
16th to endNight
8%10%49%7%47%5%5%6%28%
2155
March1st to 15thNight
13%9%49%5%34447%32%
2220
16th to endNight
13%10%38%5%34446%35%
2288
April1st to 15thNight
13%7%35%334447%41%
1908
16th to endNight
20%8%35%5%23346%36%
1736
May1st to 15thNight
17%7%35%6%24446%37%
1705
16th to endNight
10%425%4245%7%7%46%
1514
June1st to 15thNight
11%4145%2346%10%45%
1365
16th to endNight
6%213425%47%10%49%
1365
July1st to 15thNight
4213324448%60%
1365
16th to endNight
431332345%8%59%
1577
August1st to 15thNight
5%31332346%8%56%
1727
16th to endNight
8%41332435%5%56%
1845
September1st to 15thNight
9%313224347%58%
1846
16th to endNight
13%413323346%54%
1980
October1st to 15thNight
13%5%25%434446%44%
2124
16th to endNight
17%9%34423345%39%
2406
November1st to 15thNight
11%10%5%6%435%45%5%36%
2593
16th to endNight
13%8%36%6%45%45%6%33%
2730
December1st to 15thNight
10%14%7%9%9%45%445%24%
2870
16th to endNight
13%17%7%10%8%4434421%
3120

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
55%6%14%18%5%
1379
16th to endDay
63%6%14%12%2
1706
February1st to 15thDay
54%6%14%18%4
1711
16th to endDay
61%8%12%14%3
1614
March1st to 15thDay
55%7%14%17%4
2070
16th to endDay
56%6%14%18%3
2288
April1st to 15thDay
46%6%15%21%9%1
2367
16th to endDay
52%5%11%19%10%
2499
May1st to 15thDay
51%5%12%23%7%
2575
16th to endDay
44%7%14%24%9%
2952
June1st to 15thDay
45%7%15%24%7%
2925
16th to endDay
36%9%18%25%10%
2925
July1st to 15thDay
29%7%15%31%14%1
2766
16th to endDay
27%9%19%30%11%1
2773
August1st to 15thDay
32%9%17%27%10%2
2472
16th to endDay
32%6%14%30%13%1
2653
September1st to 15thDay
33%6%15%33%10%
2112
16th to endDay
36%6%15%32%8%
1980
October1st to 15thDay
43%6%14%24%11%
1824
16th to endDay
53%5%13%18%8%
1817
November1st to 15thDay
50%6%14%17%10%
1594
16th to endDay
56%7%14%14%6%
1560
December1st to 15thDay
64%7%11%14%2
1417
16th to endDay
64%6%10%12%5%
1456
January1st to 15thNight
56%7%11%17%6%
2889
16th to endNight
56%7%14%15%5%
2870
February1st to 15thNight
50%8%14%20%6%
2483
16th to endNight
53%7%12%17%8%
2155
March1st to 15thNight
50%6%14%20%7%
2220
16th to endNight
49%6%15%22%5%
2288
April1st to 15thNight
41%5%13%24%12%1
1908
16th to endNight
49%5%9%22%11%2
1736
May1st to 15thNight
47%6%11%18%14%1
1706
16th to endNight
34%8%15%26%13%2
1516
June1st to 15thNight
34%6%16%30%10%2
1365
16th to endNight
27%8%19%28%12%3
1365
July1st to 15thNight
22%7%15%31%19%2
1295
16th to endNight
21%6%17%32%17%3
1483
August1st to 15thNight
24%6%14%32%17%3
1717
16th to endNight
27%7%12%31%19%1
1845
September1st to 15thNight
26%6%14%37%14%1
1846
16th to endNight
32%5%13%33%15%
1980
October1st to 15thNight
40%5%12%27%12%2
2124
16th to endNight
45%6%14%23%9%
2406
November1st to 15thNight
47%6%12%22%10%1
2593
16th to endNight
48%7%19%15%8%
2730
December1st to 15thNight
61%6%13%13%4
2870
16th to endNight
66%5%10%12%5%
3120

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
12%7%30%35%11%2
135
16th to endDay
19%6%26%38%9%
144
February1st to 15thDay
12%10%38%34%3
135
16th to endDay
16%10%49%18%5%
120
March1st to 15thDay
17%10%29%33%8%1
135
16th to endDay
22%6%27%23%15%4
144
April1st to 15thDay
17%22%27%21%10%
366
16th to endDay
23%20%24%19%9%1
511
May1st to 15thDay
17%18%28%24%10%
543
16th to endDay
17%16%23%24%13%4
597
June1st to 15thDay
14%18%26%27%12%1
570
16th to endDay
10%17%28%27%13%3
570
July1st to 15thDay
8%10%24%30%20%5%
550
16th to endDay
5%13%24%32%18%5%
595
August1st to 15thDay
7%8%19%33%23%6%
549
16th to endDay
12%8%23%28%21%5%
589
September1st to 15thDay
8%8%31%32%17%1
267
16th to endDay
23%5%34%20%11%3
135
October1st to 15thDay
15%8%40%27%8%
135
16th to endDay
19%15%26%26%10%1
144
November1st to 15thDay
17%5%31%28%14%2
135
16th to endDay
28%14%28%25%2
135
December1st to 15thDay
21%5%35%28%9%
135
16th to endDay
17%9%38%25%8%1
144
January1st to 15thNight
10%21%29%27%9%1
975
16th to endNight
13%23%29%27%5%
1040
February1st to 15thNight
12%22%23%29%9%2
955
16th to endNight
10%21%26%27%12%2
789
March1st to 15thNight
13%20%28%27%10%
660
16th to endNight
15%21%26%23%11%1
624
April1st to 15thNight
14%23%27%27%7%
584
16th to endNight
21%21%24%21%9%
579
May1st to 15thNight
15%21%27%27%7%
585
16th to endNight
10%20%27%28%12%
611
June1st to 15thNight
10%19%24%36%8%
585
16th to endNight
7%17%22%38%13%
585
July1st to 15thNight
6%12%21%41%17%
555
16th to endNight
5%17%19%39%16%1
612
August1st to 15thNight
6%10%16%43%20%2
575
16th to endNight
9%10%25%32%20%1
615
September1st to 15thNight
8%10%25%40%13%1
540
16th to endNight
10%12%28%33%12%
537
October1st to 15thNight
16%16%28%29%8%
684
16th to endNight
23%13%30%24%8%
870
November1st to 15thNight
14%19%29%27%8%
950
16th to endNight
14%23%30%25%5%
975
December1st to 15thNight
14%22%29%27%5%
975
16th to endNight
19%21%28%23%6%
1040
Page generated at 2018-08-30 04:34:21. Version ac04

Copyright 2018 A. Danko


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