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 2019-05-11.

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%
18347
18%
53648
10%
18304
43%
18304
24%
35479

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
23%
1050
15%
2926
6%
1045
31%
1045
18%
2101
January16th to endNight
21%
1120
13%
3041
4%
1120
28%
1120
18%
2252
February1st to 15thNight
21%
1026
13%
2678
3%
1026
29%
1026
19%
1952
February16th to endNight
24%
741
18%
2211
7%
741
33%
741
18%
1522
March1st to 15thNight
26%
802
17%
2482
9%
802
34%
802
20%
1637
March16th to endNight
30%
672
16%
2356
12%
672
38%
672
19%
1562
April1st to 15thNight
26%
629
16%
2097
8%
629
38%
629
18%
1428
April16th to endNight
35%
624
18%
2061
12%
624
44%
624
22%
1352
May1st to 15thNight
32%
617
16%
1689
8%
617
39%
617
22%
1215
May16th to endNight
49%
611
17%
1625
9%
609
55%
609
35%
1011
June1st to 15thNight
49%
585
15%
1560
8%
585
52%
585
33%
994
June16th to endNight
52%
585
16%
1560
9%
585
56%
585
36%
978
July1st to 15thNight
66%
555
20%
1480
12%
555
68%
555
47%
833
July16th to endNight
68%
612
21%
1545
15%
579
70%
579
47%
858
August1st to 15thNight
70%
575
23%
1649
20%
572
73%
572
40%
942
August16th to endNight
61%
621
20%
2070
21%
621
65%
621
34%
1164
September1st to 15thNight
64%
585
28%
1950
28%
585
70%
585
37%
1024
September16th to endNight
55%
719
27%
2090
19%
719
61%
719
37%
1207
October1st to 15thNight
38%
780
22%
2340
14%
780
45%
780
27%
1477
October16th to endNight
31%
832
19%
2590
11%
832
40%
832
24%
1651
November1st to 15thNight
30%
820
23%
2666
15%
820
41%
820
24%
1664
November16th to endNight
25%
1016
17%
2906
8%
1016
33%
1016
21%
1987
December1st to 15thNight
20%
1050
12%
2940
4%
1050
27%
1050
15%
2207
December16th to endNight
18%
1120
12%
3136
3%
1120
26%
1120
13%
2461

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%3445%7%36%
54216
Night
13%8%36%5%34446%39%
53816
Cloud CoverDay
13%8%36%5%3445%7%36%
54226
Night
13%8%36%5%34446%39%
53821
Cloud CoverDay
13%8%36%5%3445%7%36%
54224
Night
13%8%36%5%34446%39%
53821
TransparencyDay
47%412%23%11%1
53901
Night
45%312%23%13%1
53649
SeeingDay
16%8%28%26%14%5%
8180
Night
17%8%30%29%11%1
18351

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%29%
1672
16th to endDay
11%11%6%12%8%345%46%23%
1885
February1st to 15thDay
14%12%7%7%434446%30%
1845
16th to endDay
14%11%46%6%25%5%46%32%
1834
March1st to 15thDay
12%11%47%434447%35%
2139
16th to endDay
17%8%46%5%33447%34%
2572
April1st to 15thDay
19%10%37%5%35%445%29%
2511
16th to endDay
20%9%35%423345%35%
2504
May1st to 15thDay
18%8%37%6%35%45%7%29%
2816
16th to endDay
13%6%26%5%245%6%8%36%
2841
June1st to 15thDay
13%5%245%345%6%8%39%
2730
16th to endDay
11%5%25%5%445%6%9%39%
2730
July1st to 15thDay
6%3245%35%5%7%9%46%
2730
16th to endDay
8%426%5%25%46%9%41%
2879
August1st to 15thDay
8%5%25%5%46%5%6%10%40%
2551
16th to endDay
12%5%25%5%345%5%8%41%
2484
September1st to 15thDay
13%41443345%6%48%
2340
16th to endDay
12%5%35%424448%43%
2182
October1st to 15thDay
17%7%26%5%23335%42%
1950
16th to endDay
15%9%35%5%2335%6%39%
1986
November1st to 15thDay
12%9%46%5%3335%6%38%
1852
16th to endDay
14%10%46%5%33336%37%
1711
December1st to 15thDay
16%12%49%7%23446%29%
1680
16th to endDay
17%15%6%9%7%35%335%20%
1792
January1st to 15thNight
12%10%6%8%6%34345%34%
2926
16th to endNight
11%11%5%9%6%35%446%28%
3041
February1st to 15thNight
12%12%5%8%6%35%44433%
2675
16th to endNight
15%11%45%5%34345%36%
2211
March1st to 15thNight
14%9%45%5%2335%6%38%
2469
16th to endNight
16%8%35%5%25%5%5%7%33%
2356
April1st to 15thNight
19%8%36%5%23435%35%
2097
16th to endNight
18%7%15%5%2345%6%38%
2061
May1st to 15thNight
19%7%246%246%5%6%33%
1689
16th to endNight
10%4344245%5%9%45%
1624
June1st to 15thNight
12%4145%3445%7%44%
1560
16th to endNight
9%5%2342446%8%47%
1560
July1st to 15thNight
6%2133135%6%8%57%
1560
16th to endNight
6%212325%45%9%54%
1641
August1st to 15thNight
6%314425%46%8%50%
1658
16th to endNight
11%4245%23437%51%
2070
September1st to 15thNight
8%31342335%6%56%
1950
16th to endNight
7%413435%45%6%52%
2090
October1st to 15thNight
15%7%24423445%44%
2340
16th to endNight
15%8%35%413446%42%
2590
November1st to 15thNight
13%7%36%5%33435%44%
2666
16th to endNight
16%9%36%5%24346%37%
2906
December1st to 15thNight
17%10%49%6%35%445%28%
2940
16th to endNight
19%13%5%8%6%35%445%22%
3136

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%10%6%9%7%45%35%6%29%
1672
16th to endDay
11%12%5%12%8%35%5%46%23%
1885
February1st to 15thDay
14%12%6%7%424446%30%
1845
16th to endDay
14%11%36%7%25%446%32%
1834
March1st to 15thDay
13%10%46%5%24447%35%
2149
16th to endDay
16%8%46%5%34446%34%
2572
April1st to 15thDay
19%10%47%5%25%446%29%
2511
16th to endDay
20%9%35%423435%35%
2504
May1st to 15thDay
17%9%37%7%35%5%5%7%29%
2816
16th to endDay
13%6%26%5%35%5%6%8%36%
2841
June1st to 15thDay
13%5%25%5%35%5%6%8%39%
2730
16th to endDay
10%5%345%45%46%10%38%
2730
July1st to 15thDay
6%3245%35%5%6%9%46%
2730
16th to endDay
8%426%5%35%5%6%8%41%
2879
August1st to 15thDay
7%5%25%5%45%5%7%10%40%
2551
16th to endDay
11%5%35%5%345%5%7%41%
2484
September1st to 15thDay
13%414433446%48%
2340
16th to endDay
11%6%35%43445%8%43%
2182
October1st to 15thDay
17%7%26%422335%42%
1950
16th to endDay
15%10%25%5%2335%5%39%
1986
November1st to 15thDay
13%9%36%6%23446%38%
1852
16th to endDay
14%11%36%5%23346%37%
1711
December1st to 15thDay
15%12%49%7%23436%29%
1680
16th to endDay
18%14%7%9%7%35%335%20%
1792
January1st to 15thNight
12%10%6%8%5%34335%34%
2926
16th to endNight
12%11%5%10%6%3445%7%28%
3041
February1st to 15thNight
12%12%5%7%6%35%5%3433%
2668
16th to endNight
15%11%46%6%24345%36%
2211
March1st to 15thNight
14%9%35%5%2335%6%38%
2482
16th to endNight
16%8%35%5%35%45%7%34%
2356
April1st to 15thNight
19%8%36%6%23445%35%
2097
16th to endNight
18%6%25%5%2445%6%38%
2061
May1st to 15thNight
18%7%25%6%25%5%5%7%33%
1688
16th to endNight
9%42442446%9%45%
1624
June1st to 15thNight
12%4245%335%5%8%44%
1560
16th to endNight
9%6%134345%5%9%46%
1560
July1st to 15thNight
5%21332445%9%56%
1560
16th to endNight
5%212325%45%10%55%
1641
August1st to 15thNight
6%3144345%6%8%51%
1658
16th to endNight
11%424423347%51%
2070
September1st to 15thNight
8%313333346%56%
1950
16th to endNight
7%42343445%7%52%
2090
October1st to 15thNight
15%6%24433445%44%
2340
16th to endNight
14%8%25%5%23446%42%
2590
November1st to 15thNight
13%7%36%433445%44%
2666
16th to endNight
16%9%36%5%24346%37%
2906
December1st to 15thNight
17%10%48%7%35%5%45%28%
2940
16th to endNight
19%13%5%8%6%45%345%23%
3136

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%28%
1672
16th to endDay
11%11%6%12%8%345%47%22%
1885
February1st to 15thDay
14%12%6%7%434446%30%
1845
16th to endDay
14%11%46%6%25%446%32%
1834
March1st to 15thDay
13%11%47%5%24447%35%
2149
16th to endDay
17%9%46%5%34446%34%
2570
April1st to 15thDay
19%10%47%5%35%446%29%
2511
16th to endDay
20%9%35%5%23345%34%
2504
May1st to 15thDay
18%8%37%6%35%45%7%28%
2816
16th to endDay
13%5%26%5%345%6%9%36%
2841
June1st to 15thDay
13%5%25%5%3446%8%39%
2730
16th to endDay
11%425%5%35%5%6%10%39%
2730
July1st to 15thDay
6%3245%35%5%7%9%46%
2730
16th to endDay
9%426%5%25%46%9%41%
2879
August1st to 15thDay
7%425%5%36%5%6%10%40%
2551
16th to endDay
11%5%26%5%25%45%8%40%
2484
September1st to 15thDay
13%41442335%6%48%
2340
16th to endDay
12%6%35%42445%8%43%
2182
October1st to 15thDay
17%7%26%423335%42%
1950
16th to endDay
16%9%35%42335%5%39%
1986
November1st to 15thDay
13%9%46%5%23446%38%
1852
16th to endDay
14%10%47%5%23336%37%
1711
December1st to 15thDay
16%12%49%6%23446%29%
1680
16th to endDay
17%15%7%9%8%25%335%20%
1792
January1st to 15thNight
12%11%6%8%6%34345%34%
2926
16th to endNight
11%11%5%9%6%45%446%28%
3041
February1st to 15thNight
12%12%5%8%6%345%4433%
2668
16th to endNight
15%11%35%5%34345%36%
2211
March1st to 15thNight
14%9%45%5%2335%6%38%
2482
16th to endNight
16%8%35%5%35%45%7%33%
2356
April1st to 15thNight
19%8%26%5%33435%35%
2097
16th to endNight
18%7%15%5%2445%6%38%
2061
May1st to 15thNight
19%7%246%346%5%6%34%
1688
16th to endNight
9%425%3245%6%9%45%
1624
June1st to 15thNight
12%4245%2445%7%44%
1560
16th to endNight
9%5%2342445%8%47%
1560
July1st to 15thNight
6%2133145%5%8%57%
1560
16th to endNight
6%21242445%10%55%
1641
August1st to 15thNight
6%314425%5%7%8%50%
1658
16th to endNight
11%3245%23437%51%
2070
September1st to 15thNight
8%31342335%6%56%
1950
16th to endNight
8%313435%45%7%52%
2090
October1st to 15thNight
15%7%24423445%44%
2340
16th to endNight
14%8%25%423447%42%
2590
November1st to 15thNight
13%7%36%434435%44%
2666
16th to endNight
16%9%36%5%24346%37%
2906
December1st to 15thNight
17%10%49%6%35%445%28%
2940
16th to endNight
19%13%5%8%6%45%445%23%
3136

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
54%314%17%9%
1673
16th to endDay
61%312%15%7%
1885
February1st to 15thDay
55%212%20%8%1
1846
16th to endDay
52%410%22%8%1
1834
March1st to 15thDay
49%213%22%10%1
2149
16th to endDay
51%312%24%7%1
2572
April1st to 15thDay
56%310%20%9%
2511
16th to endDay
51%310%20%12%2
2504
May1st to 15thDay
54%412%21%7%
2816
16th to endDay
44%5%12%22%14%1
2845
June1st to 15thDay
41%414%25%13%
2730
16th to endDay
40%5%14%24%13%1
2730
July1st to 15thDay
33%5%15%27%14%2
2581
16th to endDay
38%415%24%13%2
2712
August1st to 15thDay
36%5%13%29%13%1
2536
16th to endDay
40%412%27%12%1
2484
September1st to 15thDay
35%49%29%18%2
2340
16th to endDay
39%312%28%15%
2182
October1st to 15thDay
45%39%24%16%
1950
16th to endDay
46%313%24%11%
1986
November1st to 15thDay
45%311%26%11%1
1852
16th to endDay
49%317%22%6%
1711
December1st to 15thDay
57%212%19%7%
1680
16th to endDay
66%210%12%7%
1792
January1st to 15thNight
52%311%20%12%
2926
16th to endNight
55%213%17%9%
3041
February1st to 15thNight
53%211%20%11%1
2678
16th to endNight
50%210%24%8%2
2211
March1st to 15thNight
47%312%22%13%1
2482
16th to endNight
49%212%24%9%1
2356
April1st to 15thNight
51%29%21%14%1
2097
16th to endNight
46%310%20%14%4
2061
May1st to 15thNight
50%411%20%12%
1689
16th to endNight
34%5%15%26%16%1
1626
June1st to 15thNight
37%412%27%17%1
1560
16th to endNight
34%414%24%18%2
1560
July1st to 15thNight
25%412%33%19%4
1480
16th to endNight
24%418%30%18%3
1545
August1st to 15thNight
28%5%13%30%19%2
1649
16th to endNight
33%313%30%15%4
2070
September1st to 15thNight
28%411%26%27%2
1950
16th to endNight
31%410%33%18%1
2090
October1st to 15thNight
41%39%24%19%1
2340
16th to endNight
42%313%24%15%1
2590
November1st to 15thNight
42%211%23%16%2
2666
16th to endNight
48%313%24%8%
2906
December1st to 15thNight
58%211%19%7%
2940
16th to endNight
63%210%15%6%1
3136

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
21%12%30%29%5%
180
16th to endDay
19%11%38%22%6%
192
February1st to 15thDay
22%18%36%16%5%
180
16th to endDay
30%17%28%17%5%
159
March1st to 15thDay
20%13%43%13%6%2
180
16th to endDay
22%9%31%23%10%3
300
April1st to 15thDay
29%10%29%20%8%
390
16th to endDay
21%10%26%23%15%3
379
May1st to 15thDay
22%9%34%23%9%1
548
16th to endDay
15%9%25%23%17%7%
597
June1st to 15thDay
14%5%26%31%18%3
570
16th to endDay
12%7%30%27%16%5%
570
July1st to 15thDay
5%422%32%22%12%
550
16th to endDay
10%325%31%20%9%
595
August1st to 15thDay
8%319%35%23%9%
547
16th to endDay
14%5%19%27%20%11%
396
September1st to 15thDay
14%317%30%22%10%
375
16th to endDay
13%6%24%29%22%4
368
October1st to 15thDay
28%8%28%23%8%1
180
16th to endDay
24%11%34%22%6%
192
November1st to 15thDay
15%15%33%21%12%2
180
16th to endDay
25%11%37%22%4
180
December1st to 15thDay
18%12%37%21%7%2
180
16th to endDay
27%15%35%20%2
192
January1st to 15thNight
18%14%35%23%7%
1050
16th to endNight
18%10%39%26%4
1120
February1st to 15thNight
19%10%37%27%5%
1030
16th to endNight
21%15%33%23%5%
741
March1st to 15thNight
19%11%34%25%7%
802
16th to endNight
20%8%33%28%9%
672
April1st to 15thNight
22%11%34%25%6%
629
16th to endNight
20%6%33%27%10%
624
May1st to 15thNight
20%5%35%28%9%
617
16th to endNight
11%5%27%37%17%1
611
June1st to 15thNight
15%423%41%14%
585
16th to endNight
12%228%37%16%1
585
July1st to 15thNight
7%116%41%27%3
555
16th to endNight
6%117%43%27%2
612
August1st to 15thNight
7%213%47%25%4
575
16th to endNight
12%215%40%23%6%
621
September1st to 15thNight
9%319%36%23%7%
585
16th to endNight
10%323%37%22%2
719
October1st to 15thNight
20%7%29%25%15%1
780
16th to endNight
18%10%33%28%8%
832
November1st to 15thNight
18%10%35%25%9%
820
16th to endNight
20%12%36%23%6%
1016
December1st to 15thNight
22%12%36%21%6%
1050
16th to endNight
25%11%34%22%4
1120
Page generated at 2019-05-11 23:31:08. Version ac04

Copyright 2019 A. Danko


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