This page made possible by the sponsorship of: David Oesper.

Dodgeville
Clear Sky Chart
History

This sumarizes the distribution of each different forecast outcome for the Dodgeville clear sky chart from 2005-11-05 to 2017-08-12.

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%
15919
18%
46484
10%
15876
43%
15876
24%
30685

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
21%
900
14%
2506
6%
895
29%
895
18%
1814
January16th to endNight
20%
960
13%
2607
4%
960
27%
960
17%
1949
February1st to 15thNight
22%
876
14%
2288
3%
876
29%
876
20%
1639
February16th to endNight
25%
636
19%
1898
8%
636
35%
636
19%
1288
March1st to 15thNight
27%
687
15%
2127
8%
687
34%
687
20%
1399
March16th to endNight
29%
576
15%
2019
11%
576
36%
576
18%
1362
April1st to 15thNight
29%
539
16%
1797
9%
539
39%
539
19%
1211
April16th to endNight
33%
540
19%
1785
13%
540
44%
540
22%
1187
May1st to 15thNight
32%
540
17%
1477
8%
540
39%
540
23%
1044
May16th to endNight
48%
563
18%
1497
9%
561
54%
561
34%
938
June1st to 15thNight
49%
540
15%
1440
8%
540
52%
540
33%
920
June16th to endNight
52%
540
17%
1440
9%
540
56%
540
37%
894
July1st to 15thNight
65%
510
19%
1360
11%
510
68%
510
46%
771
July16th to endNight
68%
564
21%
1417
15%
531
70%
531
46%
790
August1st to 15thNight
69%
527
23%
1512
20%
524
73%
524
39%
869
August16th to endNight
61%
525
19%
1750
19%
525
65%
525
34%
982
September1st to 15thNight
63%
495
28%
1650
27%
495
70%
495
37%
868
September16th to endNight
54%
607
25%
1768
17%
607
60%
607
36%
1032
October1st to 15thNight
42%
660
24%
1980
16%
660
49%
660
31%
1192
October16th to endNight
31%
704
17%
2192
10%
704
40%
704
23%
1424
November1st to 15thNight
32%
700
23%
2276
16%
700
42%
700
26%
1374
November16th to endNight
25%
870
16%
2490
8%
870
32%
870
21%
1704
December1st to 15thNight
19%
900
11%
2520
3%
900
26%
900
15%
1901
December16th to endNight
17%
960
12%
2688
3%
960
25%
960
13%
2133

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
14%8%36%5%3445%7%36%
47495
Night
13%7%35%5%34446%39%
46652
Cloud CoverDay
13%8%36%5%3445%7%36%
47505
Night
13%7%35%5%3445%6%39%
46657
Cloud CoverDay
14%7%36%5%3445%7%36%
47503
Night
13%7%35%5%24446%40%
46657
TransparencyDay
46%412%23%11%1
47180
Night
44%312%23%13%1
46485
SeeingDay
15%7%27%27%15%5%
5898
Night
17%8%31%30%11%1
15923

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
10%10%7%9%6%4445%6%27%
1432
16th to endDay
11%12%6%12%8%345%45%23%
1615
February1st to 15thDay
13%12%7%7%434446%31%
1575
16th to endDay
13%10%46%6%35%5%46%33%
1575
March1st to 15thDay
13%11%47%423347%35%
1832
16th to endDay
18%9%46%5%33347%33%
2205
April1st to 15thDay
18%8%47%6%35%446%30%
2151
16th to endDay
20%9%35%423345%34%
2175
May1st to 15thDay
18%8%37%6%35%45%7%28%
2472
16th to endDay
13%6%26%6%345%6%8%36%
2617
June1st to 15thDay
14%5%245%345%6%7%39%
2520
16th to endDay
10%5%245%45%5%6%9%39%
2520
July1st to 15thDay
7%3245%35%5%7%9%44%
2520
16th to endDay
8%427%5%25%46%9%41%
2655
August1st to 15thDay
8%5%25%5%46%5%6%10%40%
2349
16th to endDay
12%5%26%43445%8%42%
2100
September1st to 15thDay
14%41443345%6%46%
1980
16th to endDay
13%6%35%4245%5%8%41%
1847
October1st to 15thDay
14%6%25%42333447%
1650
16th to endDay
16%9%35%5%2335%6%38%
1680
November1st to 15thDay
11%8%46%43335%6%41%
1582
16th to endDay
16%10%46%5%23336%36%
1467
December1st to 15thDay
17%13%49%6%23336%28%
1440
16th to endDay
18%15%6%9%8%25%335%20%
1536
January1st to 15thNight
13%11%5%8%6%34345%33%
2506
16th to endNight
12%11%6%9%7%35%446%27%
2607
February1st to 15thNight
10%11%5%8%5%35%5%4434%
2285
16th to endNight
14%10%45%5%25%345%37%
1898
March1st to 15thNight
15%9%45%42335%6%39%
2114
16th to endNight
18%9%35%5%25%45%6%32%
2019
April1st to 15thNight
18%8%36%5%335%36%36%
1797
16th to endNight
20%7%25%42345%6%37%
1785
May1st to 15thNight
18%7%245%246%5%6%35%
1477
16th to endNight
9%4344345%5%10%44%
1496
June1st to 15thNight
12%4145%2445%7%44%
1440
16th to endNight
8%5%2342446%8%48%
1440
July1st to 15thNight
6%2133145%6%8%56%
1440
16th to endNight
6%212335%45%10%53%
1513
August1st to 15thNight
6%314425%46%7%50%
1521
16th to endNight
10%424423447%50%
1750
September1st to 15thNight
9%31342345%6%55%
1650
16th to endNight
8%313435%45%7%50%
1768
October1st to 15thNight
12%6%23423445%49%
1980
16th to endNight
16%7%35%414446%40%
2192
November1st to 15thNight
11%6%35%424445%46%
2276
16th to endNight
16%9%36%5%24346%37%
2490
December1st to 15thNight
18%10%48%6%35%44427%
2520
16th to endNight
20%13%5%8%6%35%44422%
2688

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
10%11%6%9%7%45%36%6%28%
1432
16th to endDay
11%13%6%12%7%35%5%46%23%
1615
February1st to 15thDay
13%12%7%6%424446%31%
1575
16th to endDay
13%10%36%7%35%446%34%
1575
March1st to 15thDay
14%11%46%5%23347%35%
1842
16th to endDay
18%8%46%5%24346%33%
2205
April1st to 15thDay
17%9%47%6%26%446%30%
2151
16th to endDay
20%9%35%423435%34%
2175
May1st to 15thDay
17%9%37%6%35%5%5%7%28%
2472
16th to endDay
13%6%26%5%35%5%6%8%35%
2617
June1st to 15thDay
14%5%25%5%35%5%6%8%39%
2520
16th to endDay
10%5%345%45%5%6%10%39%
2520
July1st to 15thDay
6%3245%35%6%6%9%44%
2520
16th to endDay
8%427%5%35%5%6%9%40%
2655
August1st to 15thDay
7%5%25%5%46%5%7%10%40%
2349
16th to endDay
11%5%35%5%3445%7%43%
2100
September1st to 15thDay
14%41443345%7%46%
1980
16th to endDay
12%6%35%43445%8%42%
1847
October1st to 15thDay
14%7%26%422335%46%
1650
16th to endDay
16%10%25%5%2345%6%38%
1680
November1st to 15thDay
11%8%36%5%23446%41%
1582
16th to endDay
16%11%45%5%23336%36%
1467
December1st to 15thDay
17%13%49%6%23436%28%
1440
16th to endDay
19%14%7%9%7%35%33420%
1536
January1st to 15thNight
13%10%5%9%5%34345%32%
2506
16th to endNight
12%11%6%10%6%4445%6%27%
2607
February1st to 15thNight
10%11%5%7%6%35%5%45%34%
2278
16th to endNight
14%10%46%6%24445%37%
1898
March1st to 15thNight
15%9%45%42325%6%38%
2127
16th to endNight
18%8%35%5%35%45%6%32%
2019
April1st to 15thNight
18%8%26%6%24445%36%
1797
16th to endNight
20%7%24424446%37%
1785
May1st to 15thNight
17%7%25%6%245%5%7%35%
1476
16th to endNight
9%425%4245%6%10%43%
1496
June1st to 15thNight
12%4245%245%5%7%44%
1440
16th to endNight
8%5%234345%5%9%47%
1440
July1st to 15thNight
5%21332445%9%55%
1440
16th to endNight
5%212325%45%10%54%
1513
August1st to 15thNight
6%3244345%6%8%50%
1521
16th to endNight
10%424424447%50%
1750
September1st to 15thNight
9%313333346%55%
1650
16th to endNight
7%423435%45%7%50%
1768
October1st to 15thNight
12%6%24423445%48%
1980
16th to endNight
15%7%25%423446%40%
2192
November1st to 15thNight
11%7%35%433446%46%
2276
16th to endNight
17%8%36%424346%37%
2490
December1st to 15thNight
18%10%48%6%35%5%4427%
2520
16th to endNight
20%13%5%8%6%45%345%22%
2688

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
10%10%7%9%6%4445%7%27%
1432
16th to endDay
11%12%6%12%8%345%46%23%
1615
February1st to 15thDay
13%12%7%7%334446%31%
1575
16th to endDay
13%10%45%6%35%5%46%33%
1575
March1st to 15thDay
14%11%47%423347%35%
1842
16th to endDay
18%9%46%5%33346%33%
2203
April1st to 15thDay
18%9%47%5%35%446%30%
2151
16th to endDay
21%10%35%5%23345%34%
2175
May1st to 15thDay
18%8%37%6%35%45%7%28%
2472
16th to endDay
13%5%26%6%346%6%8%35%
2617
June1st to 15thDay
14%5%25%5%3446%8%39%
2520
16th to endDay
10%425%5%35%5%6%9%39%
2520
July1st to 15thDay
7%3245%35%5%7%9%44%
2520
16th to endDay
8%427%5%25%46%9%41%
2655
August1st to 15thDay
8%425%5%36%5%6%10%40%
2349
16th to endDay
12%5%26%5%35%45%7%42%
2100
September1st to 15thDay
14%41442345%6%47%
1980
16th to endDay
12%6%35%4245%5%8%41%
1847
October1st to 15thDay
15%6%26%42233447%
1650
16th to endDay
16%9%35%5%2335%6%38%
1680
November1st to 15thDay
11%8%46%42435%6%41%
1582
16th to endDay
16%10%46%433336%37%
1467
December1st to 15thDay
17%13%49%6%23436%28%
1440
16th to endDay
18%15%7%9%8%25%435%20%
1536
January1st to 15thNight
13%11%5%8%6%34345%33%
2506
16th to endNight
11%11%6%10%6%45%446%27%
2607
February1st to 15thNight
10%11%5%7%6%35%5%4434%
2278
16th to endNight
14%11%35%5%24445%37%
1898
March1st to 15thNight
15%9%45%42335%6%38%
2127
16th to endNight
18%9%35%5%35%45%6%32%
2019
April1st to 15thNight
18%8%26%5%33436%36%
1797
16th to endNight
20%7%15%42345%5%37%
1785
May1st to 15thNight
18%7%245%246%5%6%35%
1476
16th to endNight
9%425%3245%6%10%44%
1496
June1st to 15thNight
12%4245%2445%7%44%
1440
16th to endNight
8%5%3342445%8%48%
1440
July1st to 15thNight
6%2133145%5%9%56%
1440
16th to endNight
6%212425%45%10%54%
1513
August1st to 15thNight
6%314425%47%8%50%
1521
16th to endNight
11%323423438%50%
1750
September1st to 15thNight
9%31342335%6%55%
1650
16th to endNight
8%3135%35%45%7%50%
1768
October1st to 15thNight
12%6%13423445%49%
1980
16th to endNight
15%7%35%424446%40%
2192
November1st to 15thNight
11%6%25%424436%46%
2276
16th to endNight
16%9%36%5%24346%37%
2490
December1st to 15thNight
18%10%48%6%35%5%4427%
2520
16th to endNight
20%13%5%8%6%45%44422%
2688

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%314%16%9%
1433
16th to endDay
61%313%15%6%
1615
February1st to 15thDay
55%211%21%8%1
1576
16th to endDay
51%410%23%9%1
1575
March1st to 15thDay
49%314%22%9%1
1842
16th to endDay
53%312%23%6%1
2205
April1st to 15thDay
54%310%21%9%
2151
16th to endDay
52%210%20%11%1
2175
May1st to 15thDay
53%411%21%7%
2472
16th to endDay
44%5%11%22%13%1
2621
June1st to 15thDay
42%414%24%13%
2520
16th to endDay
39%5%14%24%14%1
2520
July1st to 15thDay
34%5%15%27%13%1
2371
16th to endDay
38%415%24%13%2
2488
August1st to 15thDay
37%5%13%28%13%1
2334
16th to endDay
39%412%27%13%1
2100
September1st to 15thDay
36%410%30%16%
1980
16th to endDay
40%412%27%13%
1847
October1st to 15thDay
40%310%26%17%
1650
16th to endDay
46%314%23%11%
1680
November1st to 15thDay
43%311%27%12%2
1582
16th to endDay
50%417%21%5%
1467
December1st to 15thDay
58%212%18%6%
1440
16th to endDay
67%210%11%7%
1536
January1st to 15thNight
53%311%20%11%
2506
16th to endNight
56%213%17%8%
2607
February1st to 15thNight
50%312%21%11%1
2288
16th to endNight
48%311%25%8%2
1898
March1st to 15thNight
46%313%21%13%1
2127
16th to endNight
51%213%24%7%1
2019
April1st to 15thNight
50%28%21%14%1
1797
16th to endNight
48%310%20%14%3
1785
May1st to 15thNight
48%412%21%13%
1477
16th to endNight
34%5%16%25%16%1
1498
June1st to 15thNight
37%412%27%17%
1440
16th to endNight
33%5%14%23%20%2
1440
July1st to 15thNight
26%312%33%19%3
1360
16th to endNight
24%418%29%18%2
1417
August1st to 15thNight
29%5%13%30%20%2
1512
16th to endNight
33%313%28%16%4
1750
September1st to 15thNight
28%311%27%27%1
1650
16th to endNight
32%411%32%17%1
1768
October1st to 15thNight
36%310%26%20%2
1980
16th to endNight
44%313%24%13%1
2192
November1st to 15thNight
39%312%24%18%2
2276
16th to endNight
48%314%23%9%
2490
December1st to 15thNight
58%311%19%6%
2520
16th to endNight
65%211%14%6%1
2688

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
24%8%34%28%3
90
16th to endDay
23%12%27%27%8%1
96
February1st to 15thDay
16%21%36%15%10%
90
16th to endDay
28%13%32%19%6%
81
March1st to 15thDay
23%7%46%15%42
90
16th to endDay
26%10%25%24%10%2
189
April1st to 15thDay
25%7%31%24%10%
270
16th to endDay
22%9%29%22%12%3
270
May1st to 15thDay
20%10%34%22%9%2
429
16th to endDay
15%10%29%24%15%5%
517
June1st to 15thDay
14%5%27%29%18%3
495
16th to endDay
11%7%32%26%16%5%
495
July1st to 15thDay
6%424%32%19%11%
475
16th to endDay
10%326%29%20%9%
515
August1st to 15thDay
8%419%35%23%8%
472
16th to endDay
14%5%13%32%22%10%
268
September1st to 15thDay
16%418%30%22%8%
255
16th to endDay
12%7%23%26%23%6%
249
October1st to 15thDay
15%7%26%31%16%2
90
16th to endDay
23%7%38%23%6%
96
November1st to 15thDay
5%12%33%26%16%5%
90
16th to endDay
35%11%32%15%5%
90
December1st to 15thDay
24%11%38%23%2
90
16th to endDay
32%18%35%10%3
96
January1st to 15thNight
18%14%37%22%7%
900
16th to endNight
18%10%40%26%3
960
February1st to 15thNight
16%11%38%27%5%
880
16th to endNight
19%15%33%25%5%
636
March1st to 15thNight
21%10%34%26%7%
687
16th to endNight
21%9%32%27%8%
576
April1st to 15thNight
21%10%33%27%6%
539
16th to endNight
22%5%33%28%8%
540
May1st to 15thNight
18%6%36%27%9%
540
16th to endNight
10%5%28%39%15%
563
June1st to 15thNight
15%423%41%14%
540
16th to endNight
11%228%39%16%1
540
July1st to 15thNight
8%118%42%26%3
510
16th to endNight
6%117%44%26%2
564
August1st to 15thNight
7%213%48%24%4
527
16th to endNight
12%215%41%23%5%
525
September1st to 15thNight
10%319%36%23%6%
495
16th to endNight
11%224%36%22%2
607
October1st to 15thNight
15%6%30%27%18%1
660
16th to endNight
19%10%32%28%9%
704
November1st to 15thNight
16%10%36%26%9%
700
16th to endNight
20%12%35%23%7%
870
December1st to 15thNight
24%12%37%21%4
900
16th to endNight
27%11%33%22%5%
960
Page generated at 2017-08-13 13:16:40. Version ac04

Copyright 2017 A. Danko


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