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 2020-06-03.

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%
19777
18%
57818
10%
19734
42%
19734
24%
38366

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
22%
1125
14%
3136
5%
1120
30%
1120
18%
2254
January16th to endNight
20%
1200
13%
3259
4%
1200
28%
1200
17%
2443
February1st to 15thNight
21%
1101
13%
2873
3%
1101
28%
1101
19%
2098
February16th to endNight
23%
798
20%
2380
7%
798
34%
798
19%
1632
March1st to 15thNight
26%
859
16%
2659
8%
859
33%
859
20%
1749
March16th to endNight
29%
720
16%
2524
12%
720
37%
720
18%
1691
April1st to 15thNight
26%
674
16%
2247
8%
674
38%
674
18%
1520
April16th to endNight
34%
669
18%
2209
12%
669
44%
669
22%
1447
May1st to 15thNight
32%
675
16%
1846
8%
675
40%
675
22%
1316
May16th to endNight
47%
707
17%
1881
9%
705
52%
705
32%
1202
June1st to 15thNight
49%
637
16%
1700
9%
637
52%
637
34%
1072
June16th to endNight
52%
630
17%
1680
9%
630
56%
630
36%
1053
July1st to 15thNight
66%
600
20%
1600
12%
600
69%
600
45%
909
July16th to endNight
67%
660
21%
1673
15%
627
69%
627
46%
936
August1st to 15thNight
69%
620
24%
1778
21%
617
73%
617
39%
1023
August16th to endNight
60%
669
20%
2230
21%
669
65%
669
34%
1253
September1st to 15thNight
61%
630
28%
2100
27%
630
68%
630
36%
1130
September16th to endNight
53%
774
25%
2250
18%
774
59%
774
35%
1325
October1st to 15thNight
37%
840
21%
2520
14%
840
44%
840
27%
1599
October16th to endNight
31%
896
19%
2789
11%
896
40%
896
24%
1783
November1st to 15thNight
29%
880
22%
2861
14%
880
39%
880
23%
1803
November16th to endNight
24%
1088
17%
3113
7%
1088
33%
1088
20%
2148
December1st to 15thNight
20%
1125
12%
3150
4%
1125
27%
1125
15%
2365
December16th to endNight
18%
1200
13%
3360
3%
1200
27%
1200
14%
2615

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%
58601
Night
13%8%36%5%34446%39%
57986
Cloud CoverDay
13%8%36%5%3445%7%36%
58611
Night
13%8%36%5%34446%39%
57991
Cloud CoverDay
13%8%36%5%3445%7%36%
58609
Night
13%8%36%5%34446%39%
57991
TransparencyDay
47%312%23%11%1
58286
Night
45%312%23%13%1
57819
SeeingDay
17%8%28%25%14%4
9688
Night
17%8%31%29%11%1
19781

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%10%6%4445%7%28%
1792
16th to endDay
11%12%6%12%8%345%46%22%
2019
February1st to 15thDay
13%12%6%7%434446%30%
1980
16th to endDay
14%11%36%6%245%46%33%
1973
March1st to 15thDay
13%11%37%434447%36%
2293
16th to endDay
17%9%46%5%33447%33%
2756
April1st to 15thDay
19%9%37%5%35%445%29%
2691
16th to endDay
19%9%35%423345%35%
2686
May1st to 15thDay
18%8%37%6%35%45%7%30%
3092
16th to endDay
14%6%26%5%345%6%8%35%
3289
June1st to 15thDay
13%5%245%3446%8%40%
2969
16th to endDay
11%5%245%45%5%6%9%38%
2940
July1st to 15thDay
7%3145%35%5%7%9%46%
2940
16th to endDay
8%426%5%35%46%9%42%
3103
August1st to 15thDay
7%425%5%46%5%6%10%40%
2751
16th to endDay
11%5%25%5%345%5%7%41%
2676
September1st to 15thDay
13%5%1443345%6%47%
2520
16th to endDay
13%5%35%42445%7%42%
2351
October1st to 15thDay
17%8%26%5%23335%41%
2100
16th to endDay
15%9%35%42335%6%38%
2139
November1st to 15thDay
12%10%46%5%3335%6%38%
1987
16th to endDay
15%11%46%5%33336%35%
1834
December1st to 15thDay
15%12%49%7%24446%29%
1800
16th to endDay
16%15%6%8%7%35%346%21%
1920
January1st to 15thNight
12%10%6%8%6%34345%33%
3136
16th to endNight
12%12%6%9%6%35%446%27%
3259
February1st to 15thNight
12%12%48%6%3444433%
2870
16th to endNight
14%11%45%5%34345%36%
2380
March1st to 15thNight
14%9%35%5%2345%6%38%
2646
16th to endNight
17%9%35%5%25%5%5%6%33%
2524
April1st to 15thNight
19%8%36%5%23435%36%
2247
16th to endNight
17%7%25%5%2445%6%38%
2209
May1st to 15thNight
18%7%246%246%46%35%
1846
16th to endNight
11%5%35%4245%5%9%43%
1880
June1st to 15thNight
12%4145%3445%7%45%
1700
16th to endNight
9%6%2342446%8%47%
1680
July1st to 15thNight
6%2133135%6%8%56%
1680
16th to endNight
6%212425%45%9%54%
1769
August1st to 15thNight
6%314425%46%8%50%
1787
16th to endNight
10%4245%23437%51%
2230
September1st to 15thNight
9%413423346%55%
2100
16th to endNight
8%413435%45%6%50%
2250
October1st to 15thNight
16%7%24423445%44%
2520
16th to endNight
15%8%36%413446%41%
2789
November1st to 15thNight
13%7%36%5%33435%43%
2861
16th to endNight
16%9%36%5%24346%35%
3113
December1st to 15thNight
16%10%49%6%35%45%5%27%
3150
16th to endNight
19%12%48%6%35%445%23%
3360

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%10%7%45%36%6%28%
1792
16th to endDay
12%12%6%12%7%35%5%46%22%
2019
February1st to 15thDay
14%12%6%7%5%245%46%30%
1980
16th to endDay
14%10%46%6%35%446%33%
1973
March1st to 15thDay
13%10%46%5%24447%36%
2303
16th to endDay
17%8%46%5%34446%33%
2756
April1st to 15thDay
19%9%47%5%25%446%29%
2691
16th to endDay
19%9%35%423445%35%
2686
May1st to 15thDay
17%8%37%6%35%5%5%7%30%
3092
16th to endDay
14%6%26%5%35%5%6%8%35%
3289
June1st to 15thDay
13%5%25%5%35%5%5%8%39%
2969
16th to endDay
11%5%345%45%46%10%38%
2940
July1st to 15thDay
6%3245%35%5%6%9%46%
2940
16th to endDay
8%426%5%35%5%7%8%42%
3103
August1st to 15thDay
7%425%5%46%5%7%10%40%
2751
16th to endDay
11%5%25%5%345%5%7%41%
2676
September1st to 15thDay
13%425%43345%6%46%
2520
16th to endDay
12%6%35%43445%7%43%
2351
October1st to 15thDay
18%8%36%423335%40%
2100
16th to endDay
15%10%35%5%2335%6%39%
2139
November1st to 15thDay
12%9%46%6%33446%37%
1987
16th to endDay
15%12%46%5%23336%35%
1834
December1st to 15thDay
15%12%49%7%23445%30%
1800
16th to endDay
17%14%7%8%7%35%446%21%
1920
January1st to 15thNight
13%10%6%9%5%34345%33%
3136
16th to endNight
12%11%6%10%6%44446%27%
3259
February1st to 15thNight
12%12%5%7%6%34435%33%
2863
16th to endNight
14%10%46%6%24345%36%
2380
March1st to 15thNight
14%9%35%5%2435%6%37%
2659
16th to endNight
17%8%35%5%35%45%6%33%
2524
April1st to 15thNight
19%8%26%6%23445%36%
2247
16th to endNight
17%7%25%5%2445%6%38%
2209
May1st to 15thNight
17%7%25%6%25%5%5%6%35%
1845
16th to endNight
11%5%25%42446%8%43%
1880
June1st to 15thNight
11%4245%335%5%8%45%
1700
16th to endNight
9%6%1343445%9%46%
1680
July1st to 15thNight
5%21432445%9%55%
1680
16th to endNight
6%21232445%10%54%
1769
August1st to 15thNight
6%3144345%6%8%50%
1787
16th to endNight
10%4245%23347%51%
2230
September1st to 15thNight
9%313333346%55%
2100
16th to endNight
8%42343445%7%50%
2250
October1st to 15thNight
16%6%24423445%44%
2520
16th to endNight
14%8%35%5%23446%41%
2789
November1st to 15thNight
13%8%36%433445%43%
2861
16th to endNight
17%9%36%5%24346%36%
3113
December1st to 15thNight
16%10%48%7%345%45%27%
3150
16th to endNight
19%12%48%6%45%345%23%
3360

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%10%6%4445%7%28%
1792
16th to endDay
12%12%6%12%8%345%46%22%
2019
February1st to 15thDay
13%13%6%7%434446%30%
1980
16th to endDay
14%11%46%6%25%446%33%
1973
March1st to 15thDay
13%11%47%424347%35%
2303
16th to endDay
17%9%47%5%33446%33%
2754
April1st to 15thDay
19%9%47%5%35%445%29%
2691
16th to endDay
19%9%35%5%23345%35%
2686
May1st to 15thDay
18%8%37%6%35%45%7%29%
3092
16th to endDay
14%6%26%5%345%5%9%35%
3289
June1st to 15thDay
13%5%245%35%46%8%40%
2969
16th to endDay
11%425%5%35%5%6%10%38%
2940
July1st to 15thDay
6%3245%35%5%7%9%46%
2940
16th to endDay
8%326%5%25%46%9%42%
3103
August1st to 15thDay
8%425%5%36%5%6%10%40%
2751
16th to endDay
11%5%26%5%25%45%7%40%
2676
September1st to 15thDay
13%5%1443345%6%47%
2520
16th to endDay
12%6%35%42445%7%43%
2351
October1st to 15thDay
18%7%26%423335%41%
2100
16th to endDay
16%9%35%42335%6%39%
2139
November1st to 15thDay
13%9%46%5%33446%38%
1987
16th to endDay
14%11%47%5%33336%35%
1834
December1st to 15thDay
15%12%49%6%23446%29%
1800
16th to endDay
16%15%7%8%7%25%446%21%
1920
January1st to 15thNight
13%10%6%8%6%34345%33%
3136
16th to endNight
12%11%6%10%6%44446%28%
3259
February1st to 15thNight
12%12%5%8%6%345%4433%
2863
16th to endNight
14%11%46%5%34445%36%
2380
March1st to 15thNight
14%9%35%5%2335%6%37%
2659
16th to endNight
17%9%36%5%35%45%6%33%
2524
April1st to 15thNight
19%8%26%5%33435%36%
2247
16th to endNight
17%7%25%5%2445%6%38%
2209
May1st to 15thNight
18%7%245%346%46%35%
1845
16th to endNight
11%6%25%3245%5%8%43%
1880
June1st to 15thNight
12%4245%2445%8%45%
1700
16th to endNight
9%6%2342445%8%47%
1680
July1st to 15thNight
6%2133145%6%8%56%
1680
16th to endNight
6%31242445%10%54%
1769
August1st to 15thNight
6%314425%5%6%8%50%
1787
16th to endNight
11%4235%23437%51%
2230
September1st to 15thNight
9%423423346%55%
2100
16th to endNight
8%4235%35%45%7%50%
2250
October1st to 15thNight
16%7%24423435%44%
2520
16th to endNight
14%8%25%423446%41%
2789
November1st to 15thNight
13%8%36%433435%43%
2861
16th to endNight
16%9%36%6%24346%35%
3113
December1st to 15thNight
16%10%49%6%3445%5%27%
3150
16th to endNight
19%12%48%6%45%445%23%
3360

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%313%17%9%
1793
16th to endDay
62%311%15%6%
2019
February1st to 15thDay
55%212%19%8%1
1981
16th to endDay
52%49%21%9%2
1973
March1st to 15thDay
48%313%23%10%1
2303
16th to endDay
52%312%23%7%
2756
April1st to 15thDay
56%39%20%9%
2691
16th to endDay
51%310%20%12%2
2686
May1st to 15thDay
53%412%22%7%
3092
16th to endDay
45%5%13%21%12%1
3293
June1st to 15thDay
41%414%25%13%1
2969
16th to endDay
40%5%15%24%12%
2940
July1st to 15thDay
33%5%16%28%13%2
2791
16th to endDay
37%415%25%13%2
2936
August1st to 15thDay
36%5%13%29%13%1
2736
16th to endDay
40%412%27%13%1
2676
September1st to 15thDay
36%410%28%17%2
2520
16th to endDay
39%312%28%14%
2351
October1st to 15thDay
46%39%24%15%
2100
16th to endDay
46%213%24%11%
2139
November1st to 15thDay
46%311%25%11%1
1987
16th to endDay
51%316%20%6%
1834
December1st to 15thDay
56%211%19%8%1
1800
16th to endDay
64%210%13%7%
1920
January1st to 15thNight
52%211%19%12%
3136
16th to endNight
57%212%17%8%
3259
February1st to 15thNight
53%211%19%11%1
2873
16th to endNight
49%210%23%10%2
2380
March1st to 15thNight
46%313%22%12%1
2659
16th to endNight
50%212%24%8%1
2524
April1st to 15thNight
51%28%21%14%1
2247
16th to endNight
46%310%19%15%4
2209
May1st to 15thNight
49%411%20%13%
1846
16th to endNight
37%5%15%25%15%1
1882
June1st to 15thNight
36%312%29%17%1
1700
16th to endNight
35%415%24%17%2
1680
July1st to 15thNight
26%413%32%19%4
1600
16th to endNight
25%417%30%18%3
1673
August1st to 15thNight
29%412%31%19%2
1778
16th to endNight
33%312%30%15%3
2230
September1st to 15thNight
29%411%26%26%2
2100
16th to endNight
33%411%31%18%1
2250
October1st to 15thNight
41%39%24%19%1
2520
16th to endNight
43%312%24%15%1
2789
November1st to 15thNight
43%211%23%16%2
2861
16th to endNight
49%313%24%8%
3113
December1st to 15thNight
58%210%19%7%
3150
16th to endNight
62%210%16%6%1
3360

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
19%16%33%26%4
225
16th to endDay
23%9%34%22%9%
240
February1st to 15thDay
22%20%34%16%4
225
16th to endDay
27%15%33%18%4
201
March1st to 15thDay
21%14%40%14%6%1
225
16th to endDay
24%9%31%23%8%3
356
April1st to 15thDay
29%10%30%20%8%
450
16th to endDay
21%10%29%21%14%2
439
May1st to 15thDay
21%9%34%22%9%2
644
16th to endDay
17%9%27%23%14%6%
757
June1st to 15thDay
14%5%27%30%18%3
656
16th to endDay
13%6%29%28%15%6%
645
July1st to 15thDay
6%321%32%23%11%
625
16th to endDay
9%426%30%20%8%
675
August1st to 15thDay
8%319%34%24%9%
622
16th to endDay
14%6%21%28%19%10%
460
September1st to 15thDay
15%5%19%30%20%9%
435
16th to endDay
14%6%26%27%19%5%
428
October1st to 15thDay
29%11%26%23%8%
225
16th to endDay
24%11%35%22%5%
240
November1st to 15thDay
15%16%36%18%11%2
225
16th to endDay
28%9%36%21%4
225
December1st to 15thDay
17%15%36%21%6%1
225
16th to endDay
24%14%37%21%2
240
January1st to 15thNight
18%15%36%22%6%
1125
16th to endNight
19%10%38%26%5%
1200
February1st to 15thNight
19%11%37%26%5%
1105
16th to endNight
20%14%35%23%5%
798
March1st to 15thNight
19%11%35%24%7%
859
16th to endNight
21%8%33%27%8%
720
April1st to 15thNight
22%11%33%26%5%
674
16th to endNight
19%7%33%28%9%
669
May1st to 15thNight
20%5%34%29%9%
675
16th to endNight
13%427%36%15%1
707
June1st to 15thNight
14%424%41%15%
637
16th to endNight
13%227%38%16%1
630
July1st to 15thNight
7%116%41%29%4
600
16th to endNight
7%118%43%26%2
660
August1st to 15thNight
7%213%46%25%4
620
16th to endNight
12%216%40%22%5%
669
September1st to 15thNight
11%319%36%22%6%
630
16th to endNight
11%424%36%21%2
774
October1st to 15thNight
21%7%30%25%15%
840
16th to endNight
19%10%33%28%8%
896
November1st to 15thNight
18%10%36%25%8%
880
16th to endNight
20%12%35%23%7%
1088
December1st to 15thNight
22%13%36%21%5%
1125
16th to endNight
25%11%36%22%4
1200
Page generated at 2020-06-04 02:18:52. Version ac04

Copyright 2020 A. Danko


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