Dodgeville
Clear Sky Chart
History

This sumarizes the distribution of each different forecast outcome for the Dodgeville clear sky chart from 2005-11-06 to 2024-01-16.

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
35%
24711
18%
74706
10%
24659
42%
24659
23%
49684

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
22%
950
15%
2648
6%
946
30%
946
19%
1879
January11th to 20thNight
19%
926
12%
2591
4%
926
26%
926
15%
1974
January21st to endNight
19%
990
12%
2650
3%
990
26%
990
16%
2018
February1st to 10thNight
20%
900
12%
2340
3%
900
26%
900
18%
1731
February11th to 20thNight
23%
793
19%
2192
6%
793
32%
793
21%
1502
February21st to endNight
19%
592
19%
1776
5%
592
32%
592
18%
1232
March1st to 10thNight
24%
720
14%
2160
6%
720
31%
720
19%
1486
March11th to 20thNight
30%
581
20%
2021
12%
581
42%
581
23%
1230
March21st to endNight
25%
594
15%
2039
10%
594
34%
594
15%
1448
April1st to 10thNight
24%
540
16%
1800
7%
540
36%
540
19%
1192
April11th to 20thNight
32%
533
20%
1775
16%
533
43%
533
19%
1187
April21st to endNight
33%
540
16%
1778
9%
540
42%
540
21%
1172
May1st to 10thNight
33%
540
16%
1496
8%
540
40%
540
23%
1051
May11th to 20thNight
37%
531
18%
1417
9%
531
43%
531
26%
975
May21st to endNight
46%
584
17%
1551
9%
582
52%
582
32%
991
June1st to 10thNight
51%
540
16%
1440
9%
540
55%
540
35%
894
June11th to 20thNight
46%
540
19%
1440
10%
540
50%
540
35%
896
June21st to endNight
56%
540
19%
1440
10%
540
60%
540
38%
877
July1st to 10thNight
70%
525
19%
1400
12%
525
71%
525
45%
796
July11th to 20thNight
63%
522
22%
1392
14%
522
67%
522
44%
811
July21st to endNight
66%
591
22%
1487
16%
558
69%
558
43%
850
August1st to 10thNight
68%
537
24%
1505
20%
534
72%
534
40%
866
August11th to 20thNight
66%
534
23%
1689
23%
534
70%
534
37%
946
August21st to endNight
62%
594
23%
1980
24%
594
67%
594
36%
1067
September1st to 10thNight
59%
540
25%
1800
23%
540
66%
540
35%
977
September11th to 20thNight
55%
549
31%
1809
28%
549
61%
549
35%
1006
September21st to endNight
47%
720
25%
1984
15%
720
55%
720
35%
1204
October1st to 10thNight
45%
720
23%
2160
15%
720
51%
720
32%
1279
October11th to 20thNight
32%
720
20%
2160
11%
720
42%
720
26%
1379
October21st to endNight
28%
792
17%
2506
10%
792
36%
792
20%
1676
November1st to 10thNight
30%
740
25%
2406
15%
740
43%
740
28%
1426
November11th to 20thNight
22%
809
17%
2519
8%
809
32%
809
18%
1723
November21st to endNight
24%
950
18%
2660
8%
950
34%
950
22%
1799
December1st to 10thNight
20%
950
13%
2660
4%
950
27%
950
18%
1942
December11th to 20thNight
20%
949
13%
3200
4%
948
27%
948
13%
2349
December21st to endNight
15%
1035
8%
4835
3%
1026
24%
1026
7%
3853

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%47%6%35%5%5%7%37%
74799
Night
13%9%46%6%3445%6%39%
75017
TransparencyDay
47%412%24%12%1
74499
Night
46%412%23%14%2
74837
SeeingDay
17%11%29%26%14%4
14733
Night
17%10%31%29%11%1
24726

By Month

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 10thDay
9%11%7%10%7%5%446%8%30%
1517
11th to 20thDay
12%13%7%14%7%346%5%6%22%
1480
21st to endDay
12%13%7%13%8%445%47%23%
1704
February1st to 10thDay
12%12%6%8%5%35%6%6%7%30%
1620
11th to 20thDay
14%10%5%6%5%36%5%5%7%34%
1655
21st to endDay
14%13%5%7%6%45%5%46%32%
1480
March1st to 10thDay
14%10%5%8%6%35%447%34%
1800
11th to 20thDay
12%10%47%5%2445%7%39%
1953
21st to endDay
21%10%47%5%445%46%30%
2316
April1st to 10thDay
18%10%5%7%5%45%5%5%6%30%
2160
11th to 20thDay
17%11%38%6%345%5%5%34%
2134
21st to endDay
20%9%46%6%3436%6%32%
2180
May1st to 10thDay
17%8%37%7%45%5%6%8%30%
2461
11th to 20thDay
16%7%38%6%3446%8%33%
2479
21st to endDay
15%6%36%6%35%6%5%8%36%
2725
June1st to 10thDay
11%5%245%345%6%9%45%
2520
11th to 20thDay
12%5%25%5%35%5%6%9%42%
2520
21st to endDay
12%5%35%6%45%5%6%9%41%
2520
July1st to 10thDay
7%4245%35%6%7%9%47%
2520
11th to 20thDay
7%326%6%45%5%7%9%45%
2520
21st to endDay
8%425%5%35%5%7%10%46%
2743
August1st to 10thDay
7%425%5%46%7%8%11%40%
2421
11th to 20thDay
11%6%36%5%36%45%8%43%
2210
21st to endDay
10%5%25%5%35%5%7%8%46%
2376
September1st to 10thDay
14%5%26%6%4445%6%44%
2160
11th to 20thDay
13%5%2342446%7%49%
2132
21st to endDay
13%6%36%5%3445%7%43%
1972
October1st to 10thDay
14%6%36%5%33446%46%
1800
11th to 20thDay
19%9%36%6%3345%6%37%
1800
21st to endDay
18%10%45%5%23345%40%
1850
November1st to 10thDay
10%8%5%6%6%3345%6%44%
1672
11th to 20thDay
15%11%47%6%4445%6%33%
1658
21st to endDay
14%11%47%6%33447%38%
1520
December1st to 10thDay
14%14%49%6%245%5%6%31%
1520
11th to 20thDay
13%11%6%9%8%35%5%5%7%28%
1918
21st to endDay
16%20%10%11%7%3444417%
2783
January1st to 10thNight
11%11%6%8%7%45%45%5%35%
2648
11th to 20thNight
13%13%7%11%8%4445%5%27%
2591
21st to endNight
12%13%6%11%6%45%447%26%
2650
February1st to 10thNight
11%13%5%9%7%45%5%45%31%
2340
11th to 20thNight
10%10%47%8%45%5%5%5%38%
2191
21st to endNight
16%12%5%6%5%3435%5%35%
1776
March1st to 10thNight
16%11%46%5%3446%7%35%
2160
11th to 20thNight
13%7%36%5%35%47%7%41%
2021
21st to endNight
20%11%47%6%35%447%30%
2039
April1st to 10thNight
16%9%37%6%345%46%37%
1800
11th to 20thNight
19%8%26%6%3435%6%38%
1775
21st to endNight
17%8%35%6%35%5%6%7%36%
1778
May1st to 10thNight
17%7%35%6%35%7%5%7%35%
1496
11th to 20thNight
15%10%36%5%35%5%5%7%37%
1416
21st to endNight
12%5%26%4345%6%8%45%
1551
June1st to 10thNight
10%425%6%35%5%6%9%46%
1440
11th to 20thNight
12%6%344345%5%9%47%
1440
21st to endNight
9%6%33435%46%8%51%
1440
July1st to 10thNight
6%3234245%6%9%56%
1440
11th to 20thNight
6%4244245%5%9%55%
1440
21st to endNight
6%3235%36%5%5%10%52%
1575
August1st to 10thNight
6%3145%36%5%7%9%50%
1514
11th to 20thNight
10%42343446%9%51%
1689
21st to endNight
9%4345%24447%54%
1980
September1st to 10thNight
10%42443445%7%54%
1800
11th to 20thNight
11%4235%3445%6%53%
1809
21st to endNight
10%5%245%345%46%51%
1984
October1st to 10thNight
13%6%24434445%51%
2160
11th to 20thNight
16%8%35%5%245%5%6%42%
2160
21st to endNight
17%10%36%5%345%47%37%
2506
November1st to 10thNight
12%7%36%42345%5%49%
2406
11th to 20thNight
14%10%47%7%45%446%35%
2519
21st to endNight
16%10%47%5%2435%6%39%
2660
December1st to 10thNight
13%11%5%9%6%45%5%6%6%30%
2660
11th to 20thNight
14%11%5%10%7%45%5%45%29%
3279
21st to endNight
18%16%6%11%7%45%45%419%
4884

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
54%315%17%11%
1518
11th to 20thDay
62%410%17%7%1
1480
21st to endDay
62%312%14%8%1
1704
February1st to 10thDay
55%213%20%9%1
1620
11th to 20thDay
50%411%24%9%2
1664
21st to endDay
55%49%20%11%2
1480
March1st to 10thDay
52%313%23%8%1
1800
11th to 20thDay
45%312%24%13%2
1953
21st to endDay
56%310%22%8%1
2316
April1st to 10thDay
54%410%21%11%1
2160
11th to 20thDay
53%39%22%12%2
2134
21st to endDay
52%411%20%12%1
2180
May1st to 10thDay
52%5%13%23%7%1
2461
11th to 20thDay
49%413%23%11%1
2483
21st to endDay
46%5%11%21%14%2
2725
June1st to 10thDay
36%5%15%28%15%1
2520
11th to 20thDay
38%5%14%24%18%1
2520
21st to endDay
41%5%13%26%13%1
2520
July1st to 10thDay
33%6%15%31%13%2
2451
11th to 20thDay
35%5%16%27%15%2
2445
21st to endDay
33%416%28%15%3
2591
August1st to 10thDay
36%6%15%30%11%2
2406
11th to 20thDay
39%5%13%27%14%2
2210
21st to endDay
35%412%29%18%2
2376
September1st to 10thDay
40%5%11%25%17%2
2160
11th to 20thDay
34%412%32%16%2
2132
21st to endDay
40%410%29%16%1
1972
October1st to 10thDay
41%410%30%15%
1800
11th to 20thDay
48%311%23%14%1
1800
21st to endDay
48%312%23%13%1
1850
November1st to 10thDay
42%313%26%13%3
1672
11th to 20thDay
52%312%21%10%1
1658
21st to endDay
49%416%23%8%1
1520
December1st to 10thDay
54%313%20%9%2
1520
11th to 20thDay
56%315%15%9%2
1915
21st to endDay
73%29%11%5%
2783
January1st to 10thNight
52%311%21%13%1
2648
11th to 20thNight
60%313%16%8%
2591
21st to endNight
58%310%17%10%1
2650
February1st to 10thNight
55%211%18%12%2
2340
11th to 20thNight
47%412%22%14%2
2192
21st to endNight
52%210%22%10%4
1776
March1st to 10thNight
50%313%21%10%2
2160
11th to 20thNight
42%313%24%16%2
2021
21st to endNight
56%39%21%10%2
2039
April1st to 10thNight
48%310%23%14%2
1800
11th to 20thNight
49%47%19%18%3
1775
21st to endNight
47%412%21%13%3
1778
May1st to 10thNight
47%5%13%21%14%
1496
11th to 20thNight
46%312%23%14%1
1417
21st to endNight
37%6%14%25%17%2
1552
June1st to 10thNight
35%5%13%28%18%1
1440
11th to 20thNight
36%410%26%22%2
1440
21st to endNight
33%5%17%25%18%3
1440
July1st to 10thNight
26%5%14%34%18%3
1400
11th to 20thNight
27%5%13%31%20%4
1392
21st to endNight
28%5%18%29%18%3
1487
August1st to 10thNight
28%6%15%33%16%2
1505
11th to 20thNight
31%415%31%18%2
1689
21st to endNight
31%412%29%20%5%
1980
September1st to 10thNight
30%411%28%24%2
1800
11th to 20thNight
32%411%33%18%2
1809
21st to endNight
34%410%30%20%1
1984
October1st to 10thNight
35%49%30%21%2
2160
11th to 20thNight
42%313%23%18%1
2160
21st to endNight
47%410%24%13%1
2506
November1st to 10thNight
38%311%27%18%3
2406
11th to 20thNight
51%313%21%12%1
2519
21st to endNight
47%313%25%10%1
2660
December1st to 10thNight
55%312%21%8%1
2660
11th to 20thNight
58%312%18%8%1
3281
21st to endNight
69%38%15%5%
4884

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
16%17%31%25%9%2
270
11th to 20thDay
22%16%36%19%6%1
255
21st to endDay
20%15%36%23%5%
264
February1st to 10thDay
18%20%43%16%4
240
11th to 20thDay
24%23%30%18%6%
240
21st to endDay
23%21%42%12%2
198
March1st to 10thDay
18%18%43%16%5%
240
11th to 20thDay
18%20%37%17%6%3
240
21st to endDay
30%11%31%19%7%1
402
April1st to 10thDay
26%15%34%20%5%
420
11th to 20thDay
24%18%27%19%12%1
412
21st to endDay
24%15%27%21%12%2
420
May1st to 10thDay
21%13%33%25%7%1
544
11th to 20thDay
19%14%29%23%12%3
625
21st to endDay
17%10%25%25%16%7%
679
June1st to 10thDay
11%5%27%33%20%5%
630
11th to 20thDay
13%7%30%30%15%4
630
21st to endDay
13%8%30%29%15%5%
630
July1st to 10thDay
7%417%33%26%12%
621
11th to 20thDay
8%6%26%32%21%7%
618
21st to endDay
7%5%28%34%20%6%
684
August1st to 10thDay
7%322%35%24%10%
626
11th to 20thDay
13%6%19%27%23%12%
524
21st to endDay
11%8%22%32%20%8%
495
September1st to 10thDay
18%6%20%32%18%6%
450
11th to 20thDay
13%5%20%33%21%7%
450
21st to endDay
17%10%28%25%18%3
442
October1st to 10thDay
17%10%28%29%14%1
270
11th to 20thDay
25%20%31%17%6%
270
21st to endDay
27%15%32%18%5%2
297
November1st to 10thDay
13%17%40%20%7%2
270
11th to 20thDay
19%22%33%18%7%1
270
21st to endDay
22%11%40%23%4
270
December1st to 10thDay
17%19%39%17%7%1
270
11th to 20thDay
20%11%40%21%7%
270
21st to endDay
29%16%37%16%2
297
January1st to 10thNight
16%16%36%24%7%1
950
11th to 20thNight
19%13%37%25%5%1
926
21st to endNight
20%12%37%26%5%1
990
February1st to 10thNight
18%13%38%25%5%
900
11th to 20thNight
16%15%40%25%5%
797
21st to endNight
23%17%36%20%41
592
March1st to 10thNight
21%13%38%22%6%1
720
11th to 20thNight
18%10%36%28%8%1
581
21st to endNight
25%12%31%25%7%
594
April1st to 10thNight
20%14%37%23%6%
540
11th to 20thNight
22%13%30%29%7%
533
21st to endNight
19%9%33%28%9%1
540
May1st to 10thNight
19%9%33%31%7%1
540
11th to 20thNight
17%9%30%33%11%
531
21st to endNight
14%5%28%35%17%1
584
June1st to 10thNight
10%5%26%43%15%1
540
11th to 20thNight
14%5%30%37%14%
540
21st to endNight
12%424%43%17%1
540
July1st to 10thNight
7%313%42%33%3
525
11th to 20thNight
8%419%44%23%2
522
21st to endNight
8%318%45%25%2
591
August1st to 10thNight
7%216%46%27%3
537
11th to 20thNight
11%214%41%25%6%
534
21st to endNight
11%317%45%21%3
594
September1st to 10thNight
11%422%38%19%6%
540
11th to 20thNight
13%323%34%23%5%
549
21st to endNight
13%8%27%33%19%1
720
October1st to 10thNight
16%6%28%30%19%1
720
11th to 20thNight
19%12%32%28%9%
720
21st to endNight
21%12%34%25%8%
792
November1st to 10thNight
15%12%39%25%9%
740
11th to 20thNight
19%17%37%21%6%
809
21st to endNight
20%14%36%24%6%
950
December1st to 10thNight
20%14%39%22%5%1
950
11th to 20thNight
22%12%37%24%5%
950
21st to endNight
26%16%35%20%3
1045
Page generated at 2024-01-13 00:38:14. Version ac07

Copyright 2024 Attilla Danko


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