Warren Dunes State Park
Clear Sky Chart
History

This sumarizes the distribution of each different forecast outcome for the Warren Dunes State Park clear sky chart from 2005-11-06 to 2024-02-25.

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
33%
24748
14%
80736
10%
24642
38%
24642
17%
58626

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
14%
941
6%
4410
3%
926
19%
926
5%
3676
January11th to 20thNight
13%
949
4%
4433
3%
930
17%
930
5%
3943
January21st to endNight
12%
1043
4%
4870
2%
1023
17%
1023
5%
4166
February1st to 10thNight
17%
813
10%
2371
4%
813
22%
813
11%
1902
February11th to 20thNight
19%
740
12%
2219
5%
740
25%
740
12%
1703
February21st to endNight
15%
611
12%
1831
3%
611
24%
611
12%
1413
March1st to 10thNight
24%
720
11%
2160
7%
720
27%
720
15%
1586
March11th to 20thNight
30%
720
20%
2074
10%
720
38%
720
23%
1393
March21st to endNight
30%
676
16%
2062
10%
676
37%
676
18%
1486
April1st to 10thNight
27%
540
14%
1800
9%
540
36%
540
18%
1223
April11th to 20thNight
31%
533
20%
1775
13%
533
40%
533
20%
1171
April21st to endNight
32%
540
17%
1629
9%
540
39%
540
20%
1119
May1st to 10thNight
35%
540
15%
1620
9%
540
40%
540
21%
1109
May11th to 20thNight
42%
531
17%
1577
10%
531
49%
531
24%
1045
May21st to endNight
51%
583
17%
1552
11%
582
54%
582
31%
1006
June1st to 10thNight
54%
540
18%
1440
12%
540
59%
540
37%
868
June11th to 20thNight
48%
540
18%
1440
11%
540
54%
540
34%
914
June21st to endNight
51%
540
16%
1440
10%
540
56%
540
32%
910
July1st to 10thNight
65%
525
18%
1400
14%
525
68%
525
40%
828
July11th to 20thNight
61%
522
23%
1392
17%
522
64%
522
40%
810
July21st to endNight
68%
591
22%
1487
17%
558
69%
558
41%
871
August1st to 10thNight
68%
537
23%
1556
20%
534
71%
534
37%
895
August11th to 20thNight
64%
534
22%
1656
20%
534
67%
534
34%
943
August21st to endNight
63%
594
24%
1980
23%
594
67%
594
32%
1093
September1st to 10thNight
57%
540
22%
1800
22%
540
60%
540
29%
1068
September11th to 20thNight
61%
697
31%
1957
25%
697
66%
697
38%
1149
September21st to endNight
47%
720
24%
1980
16%
720
52%
720
30%
1263
October1st to 10thNight
44%
720
23%
1980
16%
720
50%
720
29%
1284
October11th to 20thNight
28%
720
16%
2188
8%
720
37%
720
18%
1517
October21st to endNight
22%
792
15%
2574
9%
792
31%
792
14%
1866
November1st to 10thNight
28%
740
19%
2406
14%
740
36%
740
18%
1635
November11th to 20thNight
19%
760
14%
2470
8%
760
28%
760
12%
1860
November21st to endNight
20%
760
13%
2470
8%
760
26%
760
12%
1891
December1st to 10thNight
14%
906
6%
2616
3%
906
17%
906
8%
2178
December11th to 20thNight
14%
950
7%
3270
3%
949
18%
949
7%
2718
December21st to endNight
11%
1040
4%
4851
2%
1026
15%
1026
4%
4124

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%10%47%6%35%45%7%34%
78353
Night
16%12%5%8%6%3445%6%30%
80999
TransparencyDay
51%311%21%12%2
78054
Night
56%310%19%10%1
80819
SeeingDay
18%14%29%23%12%4
14730
Night
21%11%27%27%12%1
24769

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
14%22%10%11%8%44445%14%
2527
11th to 20thDay
14%17%10%15%10%6%12%4228%
2530
21st to endDay
24%23%7%10%6%2333414%
2783
February1st to 10thDay
15%15%7%11%9%45%45%5%20%
1804
11th to 20thDay
15%11%6%14%8%4445%424%
1848
21st to endDay
16%13%9%10%6%34447%24%
1520
March1st to 10thDay
16%12%7%7%6%45%45%7%28%
1800
11th to 20thDay
13%10%5%8%5%3445%8%35%
1885
21st to endDay
19%13%48%6%35%45%6%28%
2310
April1st to 10thDay
17%11%46%5%3445%7%34%
2160
11th to 20thDay
15%10%36%5%34447%38%
2134
21st to endDay
18%10%26%5%3445%7%35%
2330
May1st to 10thDay
18%8%35%5%25%5%6%7%35%
2340
11th to 20thDay
18%8%35%5%2445%6%39%
2314
21st to endDay
12%436%5%35%46%9%42%
2725
June1st to 10thDay
10%5%35%5%35%5%6%7%47%
2520
11th to 20thDay
9%435%5%345%5%8%48%
2520
21st to endDay
11%5%25%435%5%7%8%45%
2520
July1st to 10thDay
8%425%5%345%6%8%51%
2520
11th to 20thDay
9%3244345%7%9%49%
2520
21st to endDay
7%425%5%35%6%6%9%49%
2743
August1st to 10thDay
8%4245%26%5%7%9%49%
2372
11th to 20thDay
9%425%5%446%6%9%46%
2242
21st to endDay
9%325%5%35%46%8%51%
2376
September1st to 10thDay
11%5%26%435%46%8%46%
2160
11th to 20thDay
13%5%244345%5%8%46%
1984
21st to endDay
13%6%35%5%35%6%6%8%42%
1980
October1st to 10thDay
16%7%26%6%34446%43%
1980
11th to 20thDay
24%8%35%5%3445%7%31%
1769
21st to endDay
25%11%37%6%3445%6%25%
1782
November1st to 10thDay
16%12%36%5%2345%7%37%
1672
11th to 20thDay
17%19%6%9%5%24446%24%
1710
21st to endDay
21%15%7%9%5%3433424%
1710
December1st to 10thDay
16%20%11%11%6%23245%20%
1562
11th to 20thDay
15%21%10%11%6%24445%18%
1918
21st to endDay
21%22%8%13%7%34335%10%
2783
January1st to 10thNight
18%21%11%11%7%3344413%
4428
11th to 20thNight
16%21%10%14%7%49%33310%
4440
21st to endNight
25%19%10%11%7%2334412%
4884
February1st to 10thNight
17%15%6%9%10%44445%22%
2371
11th to 20thNight
15%13%5%12%8%45%45%5%25%
2218
21st to endNight
19%14%7%10%6%2434427%
1831
March1st to 10thNight
16%12%6%8%6%445%5%5%30%
2160
11th to 20thNight
13%9%47%5%34447%39%
2074
21st to endNight
20%10%5%7%425%45%6%31%
2062
April1st to 10thNight
15%10%46%6%35%5%5%7%35%
1800
11th to 20thNight
19%9%35%5%245%5%6%37%
1775
21st to endNight
19%7%36%5%435%5%7%35%
1629
May1st to 10thNight
18%8%36%5%445%5%8%35%
1620
11th to 20thNight
18%6%26%5%3435%7%40%
1576
21st to endNight
11%5%27%5%35%6%7%9%41%
1551
June1st to 10thNight
10%4245%245%6%10%48%
1440
11th to 20thNight
9%6%35%5%45%5%6%8%46%
1440
21st to endNight
9%436%5%35%5%7%9%42%
1440
July1st to 10thNight
6%3246%36%46%8%52%
1440
11th to 20thNight
10%31342447%9%53%
1440
21st to endNight
7%3145%35%6%7%9%50%
1575
August1st to 10thNight
7%4144445%7%10%49%
1565
11th to 20thNight
8%4245%35%5%5%9%49%
1656
21st to endNight
9%4245%345%5%8%51%
1980
September1st to 10thNight
12%6%36%5%335%5%7%48%
1800
11th to 20thNight
13%5%2342335%8%52%
1957
21st to endNight
13%6%25%5%345%5%8%44%
1980
October1st to 10thNight
16%6%245%3445%6%45%
1980
11th to 20thNight
23%9%36%5%23446%35%
2188
21st to endNight
27%10%37%5%2343431%
2574
November1st to 10thNight
17%13%45%5%3435%5%38%
2406
11th to 20thNight
15%19%6%9%5%34445%26%
2470
21st to endNight
20%18%6%7%5%34335%25%
2470
December1st to 10thNight
18%23%10%10%6%33345%17%
2616
11th to 20thNight
15%20%11%12%6%34445%16%
3279
21st to endNight
24%22%7%10%7%35%435%11%
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
75%111%10%3
2528
11th to 20thDay
85%26%7%1
2530
21st to endDay
78%17%12%2
2783
February1st to 10thDay
68%310%13%6%1
1804
11th to 20thDay
63%39%16%7%
1858
21st to endDay
63%310%14%8%1
1520
March1st to 10thDay
58%311%20%8%1
1800
11th to 20thDay
50%313%22%11%2
1885
21st to endDay
58%410%22%5%1
2310
April1st to 10thDay
52%49%23%13%
2160
11th to 20thDay
47%39%22%15%3
2134
21st to endDay
50%312%20%13%3
2330
May1st to 10thDay
49%413%25%9%1
2340
11th to 20thDay
47%310%24%14%2
2318
21st to endDay
40%412%26%14%2
2725
June1st to 10thDay
37%410%27%19%2
2520
11th to 20thDay
35%411%26%20%3
2520
21st to endDay
37%5%15%24%16%3
2520
July1st to 10thDay
33%411%27%20%4
2451
11th to 20thDay
32%5%13%29%18%3
2445
21st to endDay
32%6%13%29%17%3
2591
August1st to 10thDay
32%5%15%32%14%2
2357
11th to 20thDay
35%5%14%27%17%2
2242
21st to endDay
32%412%27%19%4
2376
September1st to 10thDay
37%5%14%24%16%4
2160
11th to 20thDay
36%411%31%16%1
1984
21st to endDay
39%5%9%27%18%1
1980
October1st to 10thDay
44%49%25%16%2
1980
11th to 20thDay
53%311%22%10%1
1769
21st to endDay
62%311%17%7%1
1782
November1st to 10thDay
48%413%20%14%1
1672
11th to 20thDay
64%29%17%6%1
1710
21st to endDay
67%29%17%5%
1710
December1st to 10thDay
70%211%13%4
1562
11th to 20thDay
70%212%13%2
1915
21st to endDay
81%17%9%2
2783
January1st to 10thNight
76%28%12%2
4428
11th to 20thNight
82%28%7%2
4440
21st to endNight
79%19%9%2
4884
February1st to 10thNight
66%39%14%7%1
2371
11th to 20thNight
63%210%17%7%1
2219
21st to endNight
63%28%17%7%2
1831
March1st to 10thNight
57%312%19%9%1
2160
11th to 20thNight
46%313%22%13%2
2074
21st to endNight
55%39%22%10%1
2062
April1st to 10thNight
50%411%21%13%1
1800
11th to 20thNight
49%37%22%17%3
1775
21st to endNight
49%410%19%15%3
1629
May1st to 10thNight
49%312%23%11%1
1620
11th to 20thNight
45%410%21%18%1
1577
21st to endNight
40%5%14%25%15%2
1552
June1st to 10thNight
33%411%30%19%3
1440
11th to 20thNight
37%412%24%20%2
1440
21st to endNight
38%418%24%14%2
1440
July1st to 10thNight
31%414%27%20%4
1400
11th to 20thNight
29%5%13%27%22%4
1392
21st to endNight
30%5%17%24%19%5%
1487
August1st to 10thNight
32%413%31%20%1
1556
11th to 20thNight
32%5%14%28%19%2
1656
21st to endNight
33%410%27%22%5%
1980
September1st to 10thNight
38%412%24%18%6%
1800
11th to 20thNight
33%38%31%23%2
1957
21st to endNight
40%310%27%18%2
1980
October1st to 10thNight
42%39%26%18%2
1980
11th to 20thNight
53%29%22%13%1
2188
21st to endNight
58%210%21%8%1
2574
November1st to 10thNight
51%38%21%15%2
2406
11th to 20thNight
62%310%17%8%1
2470
21st to endNight
64%211%18%5%
2470
December1st to 10thNight
73%28%12%5%
2616
11th to 20thNight
73%210%12%3
3281
21st to endNight
79%210%8%2
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
21%21%36%16%5%1
270
11th to 20thDay
24%22%36%13%41
270
21st to endDay
26%23%29%18%3
297
February1st to 10thDay
30%21%31%13%41
270
11th to 20thDay
24%30%32%12%1
270
21st to endDay
27%33%31%7%2
210
March1st to 10thDay
23%29%34%11%3
240
11th to 20thDay
23%19%32%19%6%1
325
21st to endDay
31%17%29%15%7%1
462
April1st to 10thDay
25%18%30%22%41
420
11th to 20thDay
23%23%27%15%8%2
412
21st to endDay
25%17%31%17%6%3
420
May1st to 10thDay
26%16%28%19%8%2
423
11th to 20thDay
22%15%28%23%8%4
460
21st to endDay
14%11%30%25%15%5%
679
June1st to 10thDay
10%11%32%30%13%4
630
11th to 20thDay
13%9%28%33%14%3
630
21st to endDay
13%9%33%27%13%4
630
July1st to 10thDay
8%7%24%28%23%10%
621
11th to 20thDay
11%5%31%27%19%7%
618
21st to endDay
8%5%26%36%19%6%
684
August1st to 10thDay
8%321%30%25%13%
491
11th to 20thDay
11%5%24%26%25%10%
439
21st to endDay
10%422%32%23%8%
495
September1st to 10thDay
16%423%30%20%6%
450
11th to 20thDay
11%7%19%28%24%10%
450
21st to endDay
18%12%20%26%15%9%
450
October1st to 10thDay
18%9%28%25%17%3
450
11th to 20thDay
28%18%31%18%6%
320
21st to endDay
37%14%34%13%11
297
November1st to 10thDay
17%19%37%19%6%2
270
11th to 20thDay
27%26%26%15%6%
270
21st to endDay
33%19%34%13%1
270
December1st to 10thDay
24%31%27%13%5%1
270
11th to 20thDay
22%30%31%13%31
270
21st to endDay
23%31%34%11%1
297
January1st to 10thNight
25%17%35%19%4
950
11th to 20thNight
27%15%34%19%41
950
21st to endNight
24%16%34%23%4
1045
February1st to 10thNight
27%16%32%22%3
813
11th to 20thNight
22%19%33%21%4
743
21st to endNight
28%18%33%17%4
611
March1st to 10thNight
22%17%31%22%7%1
720
11th to 20thNight
20%12%34%27%7%
720
21st to endNight
25%12%26%29%7%
676
April1st to 10thNight
20%15%33%25%7%1
540
11th to 20thNight
24%11%30%26%7%1
533
21st to endNight
21%11%30%28%9%1
540
May1st to 10thNight
23%6%30%30%11%1
540
11th to 20thNight
20%6%24%35%14%1
531
21st to endNight
13%422%38%21%1
584
June1st to 10thNight
12%423%42%18%2
540
11th to 20thNight
13%327%38%17%1
540
21st to endNight
11%5%23%37%23%2
540
July1st to 10thNight
8%216%38%31%5%
525
11th to 20thNight
10%419%37%27%4
522
21st to endNight
8%315%43%29%2
591
August1st to 10thNight
8%213%44%29%4
537
11th to 20thNight
9%314%38%31%6%
534
21st to endNight
11%313%39%29%3
594
September1st to 10thNight
14%416%37%23%5%
540
11th to 20thNight
13%415%36%26%5%
697
21st to endNight
15%7%23%29%22%3
720
October1st to 10thNight
20%7%25%28%20%1
720
11th to 20thNight
27%16%23%27%6%1
720
21st to endNight
31%15%26%22%5%1
792
November1st to 10thNight
25%13%29%22%10%1
740
11th to 20thNight
26%18%30%21%41
760
21st to endNight
31%13%30%21%4
760
December1st to 10thNight
29%20%30%17%4
906
11th to 20thNight
27%15%36%19%4
950
21st to endNight
31%17%34%17%2
1045
Page generated at 2024-02-22 06:05:44. Version ac07

Copyright 2024 Attilla Danko


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