Fargo
Clear Sky Chart
History

This sumarizes the distribution of each different forecast outcome for the Fargo clear sky chart from 2005-11-06 to 2024-01-12.

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%
24957
15%
74800
9%
24898
42%
24898
22%
51252

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
29%
950
12%
2837
5%
946
36%
946
15%
2139
January11th to 20thNight
28%
908
7%
2602
4%
908
30%
908
13%
2084
January21st to endNight
24%
990
12%
2714
5%
990
29%
990
14%
2116
February1st to 10thNight
33%
900
11%
2340
4%
900
37%
900
20%
1747
February11th to 20thNight
30%
878
15%
2274
6%
874
35%
874
20%
1709
February21st to endNight
35%
650
16%
1834
7%
650
42%
650
19%
1343
March1st to 10thNight
29%
644
11%
2084
6%
644
34%
644
18%
1494
March11th to 20thNight
31%
540
19%
1980
12%
540
42%
540
21%
1280
March21st to endNight
35%
594
14%
2178
12%
594
42%
594
18%
1454
April1st to 10thNight
33%
540
15%
1836
11%
540
42%
540
22%
1175
April11th to 20thNight
31%
533
18%
1599
13%
533
39%
533
20%
1110
April21st to endNight
31%
540
16%
1620
9%
540
40%
540
20%
1133
May1st to 10thNight
33%
540
13%
1620
8%
540
37%
540
21%
1105
May11th to 20thNight
40%
531
17%
1438
6%
531
44%
531
30%
937
May21st to endNight
39%
584
14%
1402
4%
582
43%
582
32%
942
June1st to 10thNight
49%
540
16%
1260
6%
540
53%
540
40%
806
June11th to 20thNight
44%
540
15%
1260
6%
540
49%
540
38%
816
June21st to endNight
57%
540
14%
1260
8%
540
58%
540
41%
796
July1st to 10thNight
64%
525
17%
1225
9%
525
66%
525
49%
741
July11th to 20thNight
60%
522
20%
1218
8%
522
63%
522
50%
728
July21st to endNight
64%
591
20%
1488
10%
558
64%
558
47%
829
August1st to 10thNight
62%
537
21%
1601
14%
534
66%
534
39%
900
August11th to 20thNight
60%
534
22%
1600
19%
534
65%
534
38%
909
August21st to endNight
53%
594
25%
1782
24%
594
60%
594
40%
968
September1st to 10thNight
52%
540
21%
1779
20%
540
60%
540
37%
959
September11th to 20thNight
52%
540
23%
1980
21%
540
61%
540
31%
1080
September21st to endNight
41%
540
25%
1980
17%
540
55%
540
29%
1098
October1st to 10thNight
35%
665
20%
2105
13%
665
42%
665
25%
1331
October11th to 20thNight
31%
720
20%
2160
11%
720
39%
720
24%
1423
October21st to endNight
27%
944
16%
2528
6%
944
34%
944
22%
1788
November1st to 10thNight
31%
925
19%
2489
7%
925
39%
925
22%
1759
November11th to 20thNight
27%
950
14%
2660
6%
950
32%
950
16%
2009
November21st to endNight
25%
950
13%
2660
6%
950
31%
950
21%
1902
December1st to 10thNight
27%
950
9%
2769
5%
950
31%
950
14%
2130
December11th to 20thNight
21%
949
7%
3479
4%
949
26%
949
11%
2603
December21st to endNight
19%
1039
6%
5159
4%
1026
25%
1026
6%
3909

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%47%6%35%5%5%7%38%
74654
Night
11%9%47%6%35%5%5%7%38%
75074
TransparencyDay
45%7%14%23%9%1
74346
Night
46%7%14%22%10%1
74905
SeeingDay
15%9%31%30%13%3
14915
Night
15%8%33%33%10%1
24965

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
5%12%7%11%11%5%6%5%7%7%24%
1328
11th to 20thDay
9%13%7%12%9%47%5%7%6%22%
1384
21st to endDay
10%14%6%12%11%6%6%6%5%6%17%
1642
February1st to 10thDay
8%13%6%8%7%5%7%7%6%6%27%
1620
11th to 20thDay
6%11%5%9%9%7%7%6%7%7%25%
1574
21st to endDay
11%11%6%10%9%6%6%5%7%8%22%
1435
March1st to 10thDay
13%12%5%10%9%45%5%46%27%
1876
11th to 20thDay
11%10%5%10%6%46%5%5%8%30%
1980
21st to endDay
14%11%5%9%8%35%5%6%7%27%
2178
April1st to 10thDay
15%10%47%7%45%45%6%34%
2120
11th to 20thDay
18%11%5%7%5%3445%7%32%
2309
21st to endDay
22%8%46%5%3446%6%33%
2340
May1st to 10thDay
19%8%36%6%3445%6%37%
2340
11th to 20thDay
14%6%25%7%35%5%5%8%40%
2456
21st to endDay
16%6%36%6%35%45%7%39%
2870
June1st to 10thDay
14%435%5%35%5%6%9%42%
2700
11th to 20thDay
14%425%5%35%5%6%8%43%
2700
21st to endDay
10%4245%35%5%7%10%43%
2700
July1st to 10thDay
7%3243245%7%9%54%
2700
11th to 20thDay
8%315%5%345%6%10%49%
2700
21st to endDay
5%3244346%7%9%54%
2740
August1st to 10thDay
7%415%5%35%6%8%9%46%
2328
11th to 20thDay
13%6%25%4245%47%47%
2301
21st to endDay
9%5%15%5%34447%54%
2574
September1st to 10thDay
12%4245%245%5%8%51%
2178
11th to 20thDay
13%5%35%5%34447%47%
1980
21st to endDay
14%5%26%5%2446%8%44%
1980
October1st to 10thDay
17%7%26%6%34446%41%
1836
11th to 20thDay
18%10%45%5%23436%41%
1800
21st to endDay
18%11%37%5%4445%6%33%
1826
November1st to 10thDay
14%10%6%10%5%45%446%35%
1588
11th to 20thDay
10%14%6%11%9%44345%29%
1520
21st to endDay
10%12%6%10%9%34445%33%
1520
December1st to 10thDay
8%15%5%11%9%5%6%7%5%5%24%
1406
11th to 20thDay
9%12%6%12%8%5%5%6%6%6%25%
1683
21st to endDay
21%12%5%11%9%5%5%43423%
2442
January1st to 10thNight
7%9%6%10%10%48%7%6%5%28%
2837
11th to 20thNight
9%14%5%11%8%5%7%7%5%5%22%
2602
21st to endNight
10%11%5%12%9%5%7%6%7%7%23%
2714
February1st to 10thNight
8%10%5%10%7%48%6%6%6%31%
2340
11th to 20thNight
6%11%5%10%8%5%7%7%6%6%29%
2273
21st to endNight
10%10%5%9%6%5%6%6%5%6%32%
1834
March1st to 10thNight
12%11%5%9%6%5%45%5%8%31%
2084
11th to 20thNight
11%10%48%6%3445%6%39%
1980
21st to endNight
13%9%48%5%25%5%5%8%35%
2178
April1st to 10thNight
14%7%46%4345%5%8%39%
1836
11th to 20thNight
19%10%45%5%3445%5%36%
1599
21st to endNight
19%9%45%6%24447%37%
1620
May1st to 10thNight
15%9%46%6%25%45%5%39%
1620
11th to 20thNight
15%5%235%345%7%8%44%
1438
21st to endNight
12%5%27%435%6%6%7%44%
1402
June1st to 10thNight
10%3245%335%7%11%47%
1260
11th to 20thNight
9%425%435%46%9%48%
1260
21st to endNight
6%324435%5%6%10%50%
1260
July1st to 10thNight
5%224335%45%8%59%
1260
11th to 20thNight
43134235%6%9%60%
1260
21st to endNight
432342446%8%59%
1575
August1st to 10thNight
6%4144345%7%8%54%
1611
11th to 20thNight
8%5%2432445%7%56%
1600
21st to endNight
8%42432445%6%60%
1782
September1st to 10thNight
9%32333445%8%55%
1779
11th to 20thNight
9%424435%447%54%
1980
21st to endNight
14%41442345%7%52%
1980
October1st to 10thNight
15%6%35%5%345%5%7%43%
2105
11th to 20thNight
16%9%35%5%3435%6%41%
2160
21st to endNight
16%10%46%5%3445%6%38%
2528
November1st to 10thNight
11%10%5%8%5%35%5%6%7%35%
2489
11th to 20thNight
11%11%6%10%7%45%446%31%
2660
21st to endNight
12%9%37%7%5%5%46%7%35%
2660
December1st to 10thNight
8%12%7%12%10%5%6%5%5%6%26%
2769
11th to 20thNight
11%13%6%11%8%46%5%5%5%27%
3514
21st to endNight
19%14%5%10%8%45%43424%
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
58%6%16%15%5%1
1329
11th to 20thDay
62%6%13%14%5%
1384
21st to endDay
67%6%12%10%5%
1642
February1st to 10thDay
56%6%12%17%7%
1620
11th to 20thDay
56%6%14%17%6%1
1583
21st to endDay
59%8%12%15%6%
1435
March1st to 10thDay
58%7%14%16%4
1876
11th to 20thDay
53%6%14%21%7%
1980
21st to endDay
57%7%14%18%4
2178
April1st to 10thDay
51%6%11%21%9%1
2120
11th to 20thDay
52%6%13%18%11%1
2312
21st to endDay
51%7%12%22%7%1
2340
May1st to 10thDay
48%6%12%23%10%1
2340
11th to 20thDay
43%7%14%25%10%1
2460
21st to endDay
45%7%13%24%10%1
2870
June1st to 10thDay
38%8%16%28%9%
2700
11th to 20thDay
39%8%16%24%12%1
2700
21st to endDay
34%9%18%27%11%
2700
July1st to 10thDay
25%9%17%34%14%1
2626
11th to 20thDay
29%9%19%28%13%2
2619
21st to endDay
25%8%16%35%15%2
2587
August1st to 10thDay
30%9%17%31%10%2
2314
11th to 20thDay
35%8%18%27%11%1
2301
21st to endDay
29%7%13%33%15%2
2574
September1st to 10thDay
32%6%15%34%12%1
2178
11th to 20thDay
37%7%17%29%11%
1980
21st to endDay
38%8%14%31%8%1
1980
October1st to 10thDay
45%7%13%25%10%
1836
11th to 20thDay
46%5%12%25%11%1
1800
21st to endDay
53%5%15%20%7%
1826
November1st to 10thDay
52%6%14%17%11%1
1588
11th to 20thDay
59%6%13%16%7%
1520
21st to endDay
55%7%15%17%6%1
1520
December1st to 10thDay
61%7%12%16%3
1406
11th to 20thDay
57%8%17%15%3
1680
21st to endDay
67%5%8%17%3
2442
January1st to 10thNight
55%8%13%18%6%
2837
11th to 20thNight
61%8%12%11%7%1
2602
21st to endNight
59%6%13%16%6%
2714
February1st to 10thNight
50%8%15%18%8%1
2340
11th to 20thNight
53%7%11%19%10%
2274
21st to endNight
52%6%12%20%9%1
1834
March1st to 10thNight
52%7%16%18%7%
2084
11th to 20thNight
45%5%14%26%10%
1980
21st to endNight
46%7%16%21%7%1
2178
April1st to 10thNight
42%6%15%23%12%2
1836
11th to 20thNight
49%5%9%22%12%2
1599
21st to endNight
49%6%10%24%10%2
1620
May1st to 10thNight
46%7%11%20%14%2
1620
11th to 20thNight
37%7%13%23%17%3
1439
21st to endNight
38%7%14%26%14%2
1403
June1st to 10thNight
30%7%17%33%10%2
1260
11th to 20thNight
32%7%16%26%14%5%
1260
21st to endNight
27%10%20%30%12%2
1260
July1st to 10thNight
22%8%15%32%22%1
1225
11th to 20thNight
20%9%16%34%18%4
1218
21st to endNight
23%6%15%34%18%3
1488
August1st to 10thNight
27%8%13%33%17%3
1601
11th to 20thNight
28%7%16%31%16%2
1600
21st to endNight
26%6%13%32%22%1
1782
September1st to 10thNight
27%7%14%35%16%1
1779
11th to 20thNight
30%7%16%31%15%1
1980
21st to endNight
33%6%13%33%15%1
1980
October1st to 10thNight
40%6%13%27%12%2
2105
11th to 20thNight
43%6%12%25%13%1
2160
21st to endNight
47%6%15%23%9%
2528
November1st to 10thNight
47%6%12%22%11%2
2489
11th to 20thNight
55%7%13%16%9%1
2660
21st to endNight
48%7%19%19%7%
2660
December1st to 10thNight
59%7%16%15%4
2769
11th to 20thNight
58%6%16%15%4
3516
21st to endNight
65%5%12%13%5%
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
9%10%35%33%11%2
270
11th to 20thDay
14%7%35%35%9%
243
21st to endDay
21%11%33%26%8%2
264
February1st to 10thDay
15%16%34%32%4
240
11th to 20thDay
13%14%44%22%6%1
240
21st to endDay
11%7%41%34%6%
198
March1st to 10thDay
13%15%37%27%8%
240
11th to 20thDay
17%8%34%27%10%5%
240
21st to endDay
17%11%28%30%12%2
264
April1st to 10thDay
22%15%33%21%9%1
380
11th to 20thDay
26%13%25%26%8%1
590
21st to endDay
22%11%31%24%10%2
600
May1st to 10thDay
20%9%31%27%12%1
603
11th to 20thDay
17%9%31%27%13%3
625
21st to endDay
17%9%27%30%14%3
679
June1st to 10thDay
11%8%27%33%18%3
630
11th to 20thDay
14%9%39%23%13%2
630
21st to endDay
11%7%30%33%15%4
630
July1st to 10thDay
7%325%36%24%6%
621
11th to 20thDay
9%5%30%33%18%4
618
21st to endDay
5%328%38%21%5%
684
August1st to 10thDay
7%423%37%25%4
626
11th to 20thDay
13%5%22%33%18%9%
615
21st to endDay
10%5%28%33%21%3
693
September1st to 10thDay
11%6%34%29%17%3
468
11th to 20thDay
14%8%36%29%10%2
270
21st to endDay
19%14%33%23%10%2
270
October1st to 10thDay
20%9%30%28%11%2
270
11th to 20thDay
19%16%31%25%9%
270
21st to endDay
22%17%34%19%6%1
297
November1st to 10thDay
20%10%30%31%7%1
270
11th to 20thDay
17%14%40%23%6%1
270
21st to endDay
16%16%38%27%3
270
December1st to 10thDay
14%6%37%31%10%1
270
11th to 20thDay
16%11%43%26%4
270
21st to endDay
21%11%34%25%7%1
297
January1st to 10thNight
10%9%38%32%9%2
950
11th to 20thNight
15%10%34%34%7%
908
21st to endNight
15%9%39%29%8%
990
February1st to 10thNight
11%10%33%34%9%1
900
11th to 20thNight
13%10%37%30%8%2
879
21st to endNight
15%8%32%30%14%1
650
March1st to 10thNight
16%9%35%30%9%1
644
11th to 20thNight
14%8%39%30%8%1
540
21st to endNight
17%9%30%30%12%2
594
April1st to 10thNight
17%11%34%31%7%
540
11th to 20thNight
24%10%30%26%9%1
533
21st to endNight
21%10%32%26%10%
540
May1st to 10thNight
18%8%33%32%8%1
540
11th to 20thNight
15%7%34%33%11%
531
21st to endNight
13%8%35%33%10%1
584
June1st to 10thNight
10%6%29%41%13%
540
11th to 20thNight
12%5%34%40%9%
540
21st to endNight
7%427%47%14%1
540
July1st to 10thNight
6%224%47%20%1
525
11th to 20thNight
6%427%47%16%1
522
21st to endNight
5%323%47%20%2
591
August1st to 10thNight
7%220%52%17%1
537
11th to 20thNight
9%5%22%42%20%2
534
21st to endNight
10%430%37%19%1
594
September1st to 10thNight
10%5%30%39%14%2
540
11th to 20thNight
10%5%29%43%13%1
540
21st to endNight
15%6%34%34%10%
540
October1st to 10thNight
19%9%33%30%9%
665
11th to 20thNight
21%9%32%29%8%
720
21st to endNight
23%11%34%26%6%
944
November1st to 10thNight
17%9%34%33%7%
925
11th to 20thNight
17%11%36%27%8%1
950
21st to endNight
15%11%40%29%5%
950
December1st to 10thNight
13%9%38%30%9%1
950
11th to 20thNight
18%9%39%28%6%1
950
21st to endNight
23%8%36%26%6%
1045
Page generated at 2024-01-09 06:14:39. Version ac07

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